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Files

20171009/hello-gtk.c

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Original line number Diff line number Diff line 
#include <gtk/gtk.h>



int main (int argc, char **argv)

{

  gtk_init (&argc, &argv);

  GtkWidget *window = gtk_window_new (GTK_WINDOW_TOPLEVEL);

  gtk_window_set_title (GTK_WINDOW (window), "Hello");

  g_signal_connect (window, "destroy", G_CALLBACK (gtk_main_quit), NULL);

  GtkWidget *vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 5);

  gtk_container_add (GTK_CONTAINER (window), vbox);

  gtk_container_set_border_width (GTK_CONTAINER (vbox), 10);

  GtkWidget *label = gtk_label_new ("Hello, world!");

  gtk_container_add (GTK_CONTAINER (vbox), label);

  GtkWidget *button = gtk_button_new_with_label ("Quit");

  g_signal_connect (button, "clicked", G_CALLBACK (gtk_main_quit), NULL);

  gtk_container_add (GTK_CONTAINER (vbox), button);

  gtk_widget_show (button);

  gtk_widget_show (label);

  gtk_widget_show (vbox);

  gtk_widget_show (window);

  gtk_main ();

  return 0;

}

20171009/hello-opengl.c

deleted100644 → 0
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Original line number Diff line number Diff line 
#include <GL/gl.h>

#include <GL/glu.h>

#include <GL/glut.h>



void draw (void)

{

  glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

  glColor3f (1.0, 1.0, 0.0);

  glRasterPos2f (-0.65, -0.1);

  char *hello = "Hello, world!";

  while (*hello)

    glutBitmapCharacter (GLUT_BITMAP_HELVETICA_18, *hello++);

  glFlush ();

  glutSwapBuffers ();

}



void timer_handler (int data)

{

  exit (0);

}



int main (int argc, char **argv)

{

  glutInit (&argc, argv);

  glutInitDisplayMode (GLUT_RGBA | GLUT_DOUBLE | GLUT_DEPTH);

  glutInitWindowSize (320, 200);

  glutCreateWindow ("Hello");

  glutDisplayFunc (draw);

  glutTimerFunc (5000, timer_handler, 0);

  glutMainLoop ();

  return 0;

}

20171011/vi-20171011.txt

deleted100644 → 0
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Original line number Diff line number Diff line 
Umgang mit dem Text-Editor vi

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~



Aufruf: vi <Dateiname>     # einschliesslich Endung!



Notausgang: ESC : q !  (Escape, Doppelpunkt, kleines Q, Ausrufezeichen, ENTER)

= vi verlassen, ohne zu speichern



Text eingeben:

 - in den INSERT-Modus wechseln

 - am einfachsten: i eingeben. Unten links erscheint "INSERT" (oder "EINFUEGEN).

 - danach: mit Pfeiltasten bewegen, Text einfach eingeben

 - INSERT-Modus wieder verlassen: ESC



Ausserhalb des INSERT-Modus:



 - Statt Pfeiltasten: j = runter, k = rauf, h = links, l = rechts



 - i = in den INSERT-Modus gehen

 - A = am Ende der Zeile anfü in den INSERT-Modus gehen



 - :w ENTER = Speichern

 - :q  ENTER = verlassen

 - :wq  ENTER = Speichern und verlassen

 - :q!  ENTER = verlassen, ohne zu speichern



 - x = Buchstaben loeschen

 - dd = Zeile loeschen



 - Textbloecke verschieben:

   V (grosses V) druecken

   Text markieren (mit j und k)

   d (kleines d) druecken. Der markierte Text wird geloescht ("Cut").

   dorthin gehen, wo der Text eingefuegt werden soll

   p (kleines p) druecken. Der geloeschte Text wird eingefuegt ("Paste").

20171016/chars-7.c

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Original line number Diff line number Diff line 
#include <stdio.h>



int main (void)

{

  int a = 'K';

  a += 'a' - 'A';

  printf ("%c\n", a);

  return 0;

}

20171016/comma-operator-3.c

deleted100644 → 0
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Original line number Diff line number Diff line 
#include <stdio.h>



int main (void)

{

  for (int i = 0, j = 0; i < 3 && j < 3; i++, i < 3 ? 42 : j++)

    printf ("%d, %d\n", i, j);

  return 0;

}

20171016/comma-operator-4.c

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Original line number Diff line number Diff line 
#include <stdio.h>



int main (void)

{

  for (int i = 0, j = 0; i < 3 && j < 3; i++, i < 3 ? 42 : i = 0, j++)

    printf ("%d, %d\n", i, j);

  return 0;

}

20171016/comma-operator-5.c

deleted100644 → 0
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Original line number Diff line number Diff line 
#include <stdio.h>



int main (void)

{

  for (int i = 0, j = 0; i < 3 && j < 3; i++, i < 3 ? 42 : (i = 0, j++))

    printf ("%d, %d\n", i, j);

  return 0;

}

20171016/comma-operator-6.c

deleted100644 → 0
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Original line number Diff line number Diff line 
#include <stdio.h>



int main (void)

{

  for (int j = 0; j < 3; j++)

    for (int i = 0; i < 3; i++)

      printf ("%d, %d\n", i, j);

  return 0;

}

20171016/inc-dec-2.c

deleted100644 → 0
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Original line number Diff line number Diff line 
#include <stdio.h>



int main (void)

{

  int i = 3;

  printf ("%d\n", i++);

  printf ("%d\n", i++);

  return 0;

}

20171016/inc-dec-3.c

deleted100644 → 0
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Original line number Diff line number Diff line 
#include <stdio.h>



int main (void)

{

  int i = 3;

  printf ("%d\n", ++i);

  printf ("%d\n", ++i);

  return 0;

}

20171016/printf-1.c

deleted100644 → 0
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Original line number Diff line number Diff line 
#include <stdio.h>



int main (void)

{

  printf ("Eine Zahl: %d. Ein Text: %s.\n", 137, "Hello, world!");

  return 0;

}

20171016/printf-2.c

deleted100644 → 0
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Original line number Diff line number Diff line 
#include <stdio.h>



int main (void)

{

  printf ("Eine Zahl: %d. Ein Text: %s.\n", 137, "Hello, %d world!", 42);

  return 0;

}

20171016/return-screenshot.txt

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Original line number Diff line number Diff line 
#include <stdio.h>



int main (void)

{

  printf ("Hello, world!\n");

  return 12;

}

cassini/home/peter/bo/2017ws/hp/20171016> gcc -Wall -O return-2.c -o return-2

cassini/home/peter/bo/2017ws/hp/20171016> ./return-2

Hello, world!

cassini/home/peter/bo/2017ws/hp/20171016> if ./return-1; then echo "Hurra!"; else echo "Schade!"; fi

Hello, world!

Hurra!

cassini/home/peter/bo/2017ws/hp/20171016> if ./return-2; then echo "Hurra!"; else echo "Schade!"; fi

Hello, world!

Schade!

cassini/home/peter/bo/2017ws/hp/20171016> ./return-1

Hello, world!

cassini/home/peter/bo/2017ws/hp/20171016> echo $?

0

cassini/home/peter/bo/2017ws/hp/20171016> ./return-2

Hello, world!

cassini/home/peter/bo/2017ws/hp/20171016> echo $?

12

20171016/side-effects-2.c

deleted100644 → 0
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Original line number Diff line number Diff line 
#include <stdio.h>



int main (void)

{

  printf ("%d\n", 42);

  2 + 2;

  return 0;

}

20171016/side-effects-4.c

deleted100644 → 0
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Original line number Diff line number Diff line 
#include <stdio.h>



int main (void)

{

  int a = printf ("Hallo!\n");

  printf ("a = %d\n", a);

  return 0;

}

20171016/side-effects-5.c

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Original line number Diff line number Diff line 
#include <stdio.h>



int main (void)

{

  int a = printf ("%d\n", 137);

  printf ("a = %d\n", a);

  return 0;

}

20171016/test-4.c

deleted100644 → 0
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Original line number Diff line number Diff line 
#include <stdio.h>



int main (void)

{

  printf ("Hello, world!\n" + 4);

  return 0;

}

20171016/test-5.c

deleted100644 → 0
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Original line number Diff line number Diff line 
#include <stdio.h>



int main (void)

{

  printf ("Die Antwort lautet: %x.\n", 'B');

  return 0;

}

20171023/praktikum.txt

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Original line number Diff line number Diff line 
PRAKTIKUMSTERMINE

=================







Mi 08.11.2017

Mi 15.11.2017



(Versuch 2)

20171023/strings-11.c

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Original line number Diff line number Diff line 
#include <stdio.h>



int main (void)

{

  const char *p = "Hello!\n";

  p[1] = 'a';

  printf ("%s", p);

  return 0;

}

20171023/strings-3.c

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Original line number Diff line number Diff line 
#include <stdio.h>



int main (void)

{

  char hello_world[] = { 72, 101, 108, 108, 111, 44, 32, 119, 111, 114, 108, 100, 33, 10, 0 };

  int i = 0;

  while (hello_world[i])

    printf ("%c", hello_world[i++]);

  return 0;

}

20171023/strings-4.c

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Original line number Diff line number Diff line 
#include <stdio.h>



int main (void)

{

  char hello_world[] = { 72, 101, 108, 108, 111, 44, 32, 119, 111, 114, 108, 100, 33, 10 };

  int i = 0;

  while (hello_world[i])

    printf ("%c", hello_world[i++]);

  return 0;

}

20171023/strings-5.c

deleted100644 → 0
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Original line number Diff line number Diff line 
#include <stdio.h>



int main (void)

{

  int hello_world[] = "Hello, world!\n";

  int i = 0;

  while (hello_world[i])

    printf ("%c", hello_world[i++]);

  return 0;

}

20171023/strings-9.c

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Original line number Diff line number Diff line 
#include <stdio.h>



int main (void)

{

  char *p = "Hello!\n";

  p[1] = 'a';

  printf ("%s", p);

  return 0;

}

20171023/typedef-1.c

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Original line number Diff line number Diff line 
#include <stdio.h>



char *string;



int main (void)

{

  string = "Hello, world!\n";

  printf ("%s\n", string);

  return 0;

}

20171023/typedef-2.c

deleted100644 → 0
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Original line number Diff line number Diff line 
#include <stdio.h>



char *string;



int main (void)

{

  string = "Hello, world!";

  printf ("%s\n", string);

  return 0;

}

20171023/typedef-3.c

deleted100644 → 0
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Original line number Diff line number Diff line 
#include <stdio.h>



typedef char *string;



int main (void)

{

  string hello = "Hello, world!";

  printf ("%s\n", hello);

  return 0;

}

20171023/typedef-4.c

deleted100644 → 0
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Original line number Diff line number Diff line 
#include <stdio.h>



typedef char boolean;

#define true 1

#define false 0



int main (void)

{

  boolean answer = true;

  if (answer)

    printf ("%d\n", false);

  return 0;

}

20171023/typedef-5.c

deleted100644 → 0
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Original line number Diff line number Diff line 
#include <stdio.h>



typedef char string;



int main (void)

{

  string *hello = "Hello, world!";

  printf ("%s\n", hello);

  return 0;

}

20171030/photo-20171030-174900.txt

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Original line number Diff line number Diff line 
README: E-Mail-Verschlüsselung: Zertifizierungsmodelle: Hierarchische Struktur (S/MIME) vs. Web Of Trust (OpenPGP)

20171030/verschluesselung-20171030.tex

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Original line number Diff line number Diff line 
% verschluesselung-20171030.pdf - Lecture Slides on Email Encryption

% Copyright (C) 2012, 2013, 2015, 2016, 2017  Peter Gerwinski

%

% This document is free software: you can redistribute it and/or

% modify it either under the terms of the Creative Commons

% Attribution-ShareAlike 3.0 License, or under the terms of the

% GNU General Public License as published by the Free Software

% Foundation, either version 3 of the License, or (at your option)

% any later version.

%

% This document is distributed in the hope that it will be useful,

% but WITHOUT ANY WARRANTY; without even the implied warranty of

% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

% GNU General Public License for more details.

%

% You should have received a copy of the GNU General Public License

% along with this document.  If not, see <http://www.gnu.org/licenses/>.

%

% You should have received a copy of the Creative Commons

% Attribution-ShareAlike 3.0 Unported License along with this

% document.  If not, see <http://creativecommons.org/licenses/>.



% README: Sonderveranstaltung: E-Mail Verschlüsselung



\documentclass[10pt,t]{beamer}



\usepackage{pgslides}

\usepackage{pdftricks}

\usepackage{tikz}



\begin{psinputs}

  \usepackage[utf8]{inputenc}

  \usepackage[german]{babel}

  \usepackage[T1]{fontenc}

  \usepackage{helvet}

  \renewcommand*\familydefault{\sfdefault}

  \usepackage{pstricks,pst-grad}

\end{psinputs}



\title{E-Mail-Verschlüsselung}

\author{Prof.\ Dr.\ rer.\ nat.\ Peter Gerwinski}

\date{30.\ Oktober 2017}



\begin{document}



\maketitleframe



\nosectionnonumber{\inserttitle}



\begin{frame}



  \shownosectionnonumber



  \begin{itemize}

    \item[\textbf{1}] \textbf{Einführung}

      \hfill\makebox(0,0)[br]{\raisebox{2.25ex}{\url{https://gitlab.cvh-server.de/pgerwinski/hp.git}}}

      \begin{itemize}

        \item[1.1]

          Warum verschlüsseln?

        \item[1.2]

          Einfache Verschlüsselungsalgorithmen

      \end{itemize}

    \item[\textbf{2}] \textbf{Ihr Verschlüsselungs-"`Führerschein"'}

      \begin{itemize}

        \item[2.1]

          Geheime und öffentliche Schlüssel

        \item[2.2]

          Digitale Signaturen

        \item[2.3]

          Zertifikate -- Web of Trust

      \end{itemize}

    \item[\textbf{3}] \textbf{Verschlüsselung in der Praxis}

    \item[\textbf{4}] \textbf{Fazit}

  \end{itemize}



\end{frame}



\section{Einführung}

\subsection{Warum verschlüsseln?}



\begin{frame}

  \showsection

  \showsubsection



  \begin{quote}

    "`Ich habe nichts zu verbergen."'

  \end{quote}



  \begin{itemize}

    \item

      Vor wem? Wirklich vor jedem?\\

      Wirklich alles über Sie?

    \item

      Auch nicht vor dem organisierten Verbrechen?

    \item

      Illegaler Zugriff auf staatlich gesammelte Daten ist möglich!

    \bigskip

    \arrowitem

      Der einzige wirklich sichere Weg,\\

      Datensammlungen gegen Mißbrauch zu schützen,\\

      ist, die Daten gar nicht erst zu sammeln.

  \end{itemize}

\end{frame}



\subsection{Einfache Verschlüsselungsalgorithmen}



\begin{frame}

  \showsection

  \showsubsection



  \begin{itemize}

    \item

      Cäsar-Chiffre: Alphabet rotieren\\

      Beispiel: ROT13 (mit Schlüssel 13)\\

      25 verschiedene Schlüssel

      \textarrow\ Schlüssellänge $\approx 4.64$\,Bit

      ($2^{4.64} \approx 25$)\\

      leicht zu knacken

      \pause

    \item

      Zufälliges Rotieren des gesamten Zeichensatzes:\\

      Für jedes Zeichen wird neu "`gewürfelt"'.\\

      \pause

      \textarrow\ Schlüssellänge = Länge der Nachricht\\

      unknackbar

      (mathematisch beweisbar)\\

      \pause

      praktische Probleme:

      \begin{itemize}

        \item Schlüssel genauso lang wie Nachricht

              \textarrow\ schwer zu übertragen

        \item Schlüssel (echter Zufall!) schwer zu generieren

      \end{itemize}

      \pause

    \item

      Dasselbe mit Pseudozufallsgenerator\\

      Schlüssel = Startwert\\

      \pause

      \textarrow\ Schlüssellänge = Bits des Startwerts\\

      meistens knackbar,

      nur für spezielle Pseudozufallsgeneratoren sicher\\

      \textarrow\ Verschlüsselungsverfahren

  \end{itemize}

  \vspace*{-1cm}

\end{frame}



\begin{frame}

  \showsection

  \showsubsection



  \renewcommand{\arraystretch}{1.2}

  \begin{center}

    \begin{tabular}{l|c|c}

      \textbf{Verfahren} & \textbf{Schlüssellänge} & \textbf{sicher} \\\hline

      Cäsar-Chiffre & 4.64 Bit & nein \\

      One-Time Pad (OTP) & Länge der Nachricht & ja \\

      Standard-Pseudozufallszahlen & typischerweise 64 Bit & nein \\\hline

      DSA & 56 Bit & nein \\

      IDEA & 128 Bit & ja \\

      Blowfish & 128 Bit & ja \\

      Twofish & 128 Bit & ja \\

      CAST & 128 Bit & ja \\

      AES / Rijndael & 128 Bit & ja

    \end{tabular}

  \end{center}

\end{frame}



\section{Ihr Verschlüsselungs-"`Führerschein"'}

\subsection{Geheime und öffentliche Schlüssel}



\begin{frame}

  \showsection

  \showsubsection



  Verschlüsselte Kommunikation:

  \begin{itemize}

    \item

      Versenden der Nachricht über öffentlichen Kanal (z.\,B.\ E-Mail)

    \item

      Versenden des Schlüssels über geheimen Kanal (z.\,B.\ persönlich)

  \end{itemize}



  \medskip



  Probleme:

  \begin{itemize}

    \item

      Kommunikation mit Unbekannten

    \item

      Kommunikation in Gruppen

  \end{itemize}



  \medskip



  Lösung:

  \begin{itemize}

    \item

      Asymmetrische Verschlüsselungsverfahren

    \item

      Geheime und öffentliche Schlüssel

  \end{itemize}

\end{frame}



\begin{frame}

  \showsection

  \showsubsection



  Asymmetrische Verschlüsselungsverfahren:

  \begin{itemize}

    \item

      Unterschiedliche Schlüssel zum Ver- und Entschlüsseln

    \item

      Verschlüsseln: \newterm{öffentlicher Schlüssel}

    \item

      Entschlüsseln: \newterm{geheimer Schlüssel}

  \end{itemize}



  \medskip



  Schlüsselaustausch:

  \begin{itemize}

    \item

      Abhören: kein Problem mehr

    \item

      Identifikation: persönlicher Kontakt weiterhin erforderlich

  \end{itemize}



  \medskip



  Lösung:

  \begin{itemize}

    \item

      Digitale Signaturen

    \item

      Zertifikate -- Web of Trust

  \end{itemize}



  \vspace{0cm plus 1filll minus 1filll}



  \renewcommand{\arraystretch}{1.2}

  \begin{flushright}

    \begin{tabular}{l|c|c}

      \textbf{Verfahren} & \textbf{Schlüssellänge} & \textbf{sicher} \\\hline

      RSA & ab 2048 Bit & ja \\

      ElGamal & ab 2048 Bit & ja \\

      ECDSA & 160 Bit & ja

    \end{tabular}

  \end{flushright}

\end{frame}



\subsection{Digitale Signaturen}



\begin{frame}

  \showsection

  \showsubsection



  Asymmetrische Verschlüsselungsverfahren:

  \begin{itemize}

    \item

      Unterschiedliche Schlüssel zum Ver- und Entschlüsseln

    \item

      Verschlüsseln: geheimer Schlüssel

    \item

      Entschlüsseln: öffentlicher Schlüssel

    \item

      Prüfwert der Nachricht verschlüsseln

    \arrowitem

      Wer das verschlüsselt hat,\\

      muß im Besitz des geheimen Schlüssels sein.\\

      \textarrow\ \newterm{digitale Signatur}

  \end{itemize}



  \vspace{0cm plus 1filll minus 1filll}



  \renewcommand{\arraystretch}{1.2}

  \begin{flushright}

    \begin{tabular}{l|c|c}

      \textbf{Verfahren} & \textbf{Schlüssellänge} & \textbf{sicher} \\\hline

      RSA & ab 2048 Bit & ja \\

      ElGamal & ab 2048 Bit & ja \\

      ECDSA & 160 Bit & ja

    \end{tabular}

  \end{flushright}

\end{frame}



\subsection{Zertifikate -- Web of Trust}



\begin{frame}

  \showsection

  \showsubsection



  \begin{itemize}

    \item

      Alice will Bob eine verschlüsselte Nachricht schicken.

    \item

      Alice lädt den öffentlichen Schlüssel von Bob herunter.

    \arrowitem

      Ist der Schlüssel wirklich der von Bob?

    \pause

    \medskip

    \item

      Trent hat den öffentlichen Schlüssel von Bob unterschrieben:\\

      "`Ich bezeuge, daß dieser Schlüssel wirklich Bob gehört."'

    \arrowitem

      Trent agiert als \newterm{Zertifizierungsstelle}.

    \medskip

    \item

      Alice hat bereits den öffentlichen Schlüssel von Trent\\

      und kann daher die Signatur prüfen.

    \item

      Alice vertraut Trent. \textarrow\ \newterm{Vertrauen in Person}

    \arrowitem

      Der öffentliche Schlüssel von Bob ist echt. \textarrow\ \newterm{Vertrauen in Schlüssel}

  \end{itemize}

\end{frame}



\section{Verschlüsselung in der Praxis}



\begin{frame}

  \showsection



  \begin{itemize}

    \item

      Software: GNU Privacy Guard (GnuPG)\\

      herunterladen und installieren

      \begin{itemize}

        \item

          Plug-In für Mozilla Thunderbird: Enigmail

        \item

          GnuPG Basics Pack

        \item

          GPG4Win

        \item

          \dots

      \end{itemize}

    \item

      Schlüsselerzeugung

    \item

      Öffentliche Schlüssel austauschen und prüfen

    \pause

    \medskip

    \item

      Schlüssel-Server

    \medskip

    \item

      Ende-zu-Ende-Verschlüsselung

    \item

      Auf verschlüsselte Nachrichten immer verschlüsselt antworten!

    \item

      Betreff-Zeilen werden nicht mit verschlüsselt.

    \item

      Die Verbindungsdaten werden nicht mit verschlüsselt.

  \end{itemize}

\end{frame}



\section{Fazit}



\begin{frame}

  \showsection



  \begin{itemize}

    \item

      E-Mail-Verschlüsselung ist sinnvoll \dots

    \item

      \dots\ und machbar.

    \item

      Der richtige Umgang ist entscheidend.

    \medskip

    \arrowitem

      Sicherheitsbewußtsein ist entscheidend.

  \end{itemize}

\end{frame}



\end{document}

20171106/cube-1.c

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Original line number Diff line number Diff line 
#include <GL/gl.h>

#include <GL/glu.h>

#include <GL/glut.h>

#include "opengl-magic.h"



void draw (void)

{

  glClear (GL_COLOR_BUFFER_BIT + GL_DEPTH_BUFFER_BIT);

  set_material_color (1.0, 0.7, 0.0);

  glutSolidCube (0.75);

  glFlush ();

  glutSwapBuffers ();

}



int main (int argc, char **argv)

{

  init_opengl (&argc, argv, "Cube");

  glutDisplayFunc (draw);

  glutMainLoop ();

  return 0;

}

20171106/cube-2.c

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Original line number Diff line number Diff line 
#include <GL/gl.h>

#include <GL/glu.h>

#include <GL/glut.h>

#include "opengl-magic.h"



void draw (void)

{

  glClear (GL_COLOR_BUFFER_BIT + GL_DEPTH_BUFFER_BIT);

  set_material_color (1.0, 0.7, 0.0);

  glRotatef (-30.0, 0.5, 1.0, 0.0);

  glutSolidCube (0.75);

  glFlush ();

  glutSwapBuffers ();

}



int main (int argc, char **argv)

{

  init_opengl (&argc, argv, "Cube");

  glutDisplayFunc (draw);

  glutMainLoop ();

  return 0;

}

20171106/cube-3.c

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#include <GL/gl.h>

#include <GL/glu.h>

#include <GL/glut.h>

#include "opengl-magic.h"



float t = 0.0;



void draw (void)

{

  glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

  set_material_color (1.0, 0.7, 0.0);

  glRotatef (t, 0.5, 1.0, 0.0);

  glutSolidCube (0.5);

  glFlush ();

  glutSwapBuffers ();

}



void timer_handler (int value)

{

  t += 0.05;

  glutPostRedisplay ();

  glutTimerFunc (50, timer_handler, 0);

}



int main (int argc, char **argv)

{

  init_opengl (&argc, argv, "Cube");

  glutDisplayFunc (draw);

  glutTimerFunc (50, timer_handler, 0);

  glutMainLoop ();

  return 0;

}

20171106/cube-4.c

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Original line number Diff line number Diff line 
#include <GL/gl.h>

#include <GL/glu.h>

#include <GL/glut.h>

#include "opengl-magic.h"



float t = 0.0;



void draw (void)

{

  glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

  set_material_color (1.0, 0.7, 0.0);

  glPushMatrix ();

  glRotatef (t, 0.5, 1.0, 0.0);

  glutSolidCube (0.5);

  glPopMatrix ();

  glFlush ();

  glutSwapBuffers ();

}



void timer_handler (int value)

{

  t += 0.05;

  glutPostRedisplay ();

  glutTimerFunc (50, timer_handler, 0);

}



int main (int argc, char **argv)

{

  init_opengl (&argc, argv, "Cube");

  glutDisplayFunc (draw);

  glutTimerFunc (50, timer_handler, 0);

  glutMainLoop ();

  return 0;

}

20171106/cube-5.c

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#include <GL/gl.h>

#include <GL/glu.h>

#include <GL/glut.h>

#include "opengl-magic.h"



float t = 0.0;



void draw (void)

{

  glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

  set_material_color (1.0, 0.7, 0.0);

  glPushMatrix ();

  glRotatef (20.0 * t, 0.5, 1.0, 0.0);

  glutSolidCube (0.5);

  glPopMatrix ();

  glFlush ();

  glutSwapBuffers ();

}



void timer_handler (int value)

{

  t += 0.05;

  glutPostRedisplay ();

  glutTimerFunc (50, timer_handler, 0);

}



int main (int argc, char **argv)

{

  init_opengl (&argc, argv, "Cube");

  glutDisplayFunc (draw);

  glutTimerFunc (50, timer_handler, 0);

  glutMainLoop ();

  return 0;

}

20171106/hp-uebung-20171106.tex

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Original line number Diff line number Diff line 
% hp-uebung-20171106.pdf - Exercises on Low-Level Programming / Applied Computer Sciences

% Copyright (C) 2013, 2015, 2016  Peter Gerwinski

%

% This document is free software: you can redistribute it and/or

% modify it either under the terms of the Creative Commons

% Attribution-ShareAlike 3.0 License, or under the terms of the

% GNU General Public License as published by the Free Software

% Foundation, either version 3 of the License, or (at your option)

% any later version.

%

% This document is distributed in the hope that it will be useful,

% but WITHOUT ANY WARRANTY; without even the implied warranty of

% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

% GNU General Public License for more details.

%

% You should have received a copy of the GNU General Public License

% along with this document.  If not, see <http://www.gnu.org/licenses/>.

%

% You should have received a copy of the Creative Commons

% Attribution-ShareAlike 3.0 Unported License along with this

% document.  If not, see <http://creativecommons.org/licenses/>.



% README: Strings, Text-Grafik-Bibliothek



\documentclass[a4paper]{article}



\usepackage{pgscript}



\newcounter{points}

\newcommand{\onepoint}{(1 Punkt)\addtocounter{points}{1}}

\newcommand{\points}[1]{(#1 Punkte)\addtocounter{points}{#1}}



\begin{document}



  \thispagestyle{empty}



  \section*{Hardwarenahe Programmierung / Angewandte Informatik\\

            Übungsaufgaben -- 6.\ November 2017}



  \exercise{Strings}



  Strings werden in der Programmiersprache C

  durch Zeiger auf \lstinline{char}-Variable realisiert.



  Wir betrachten die folgende Funktion (Datei: \gitfile{hp}{20171106}{aufgabe-1.c}):

  \begin{center}

    \begin{minipage}{8cm}

      \begin{lstlisting}[gobble=8]

        int fun_1 (char *s1, char *s2)

        {

          int result = 1;

          for (int i = 0; s1[i] && s2[i]; i++)

            if (s1[i] != s2[i])

              result = 0;

          return result;

        }

      \end{lstlisting}

    \end{minipage}%

  \end{center}

  \begin{itemize}

    \item[(a)]

      Was bewirkt die Funktion? % \points{3}

    \item[(b)]

      Welchen Sinn hat die Bedingung "`\lstinline{s1[i] && s2[i]}"'

      in der \lstinline{for}-Schleife? % \points{2}

    \item[(c)]

      Was würde sich ändern, wenn die Bedingung "`\lstinline{s1[i] && s2[i]}"'

      in der \lstinline{for}-Schleife\\

      zu "`\lstinline{s1[i]}"' verkürzt würde? % \points{3}

%    \item[(d)]

%      Von welcher Ordnung (Landau-Symbol) ist die Funktion \lstinline{fun_1()}

%      hinsichtlich der Anzahl ihrer Zugriffe auf die Zeichen in den Strings

%      -- und warum? % \points{2}

    \item[(d)]

      Schreiben Sie eine eigene Funktion,

      die dieselbe Aufgabe erledigt wie \lstinline{fun_1()}, nur effizienter.

%      und geben Sie die Ordnung (Landau-Symbol) der von Ihnen geschriebenen Funktion an. % \points{5}

  \end{itemize}



  \exercise{Text-Grafik-Bibliothek}



  Schreiben Sie eine Bibliothek für "`Text-Grafik"' mit folgenden Funktionen:\vspace*{-\medskipamount}

  \begin{itemize}

    \item

      \lstinline|void clear (char c)|\\

      Bildschirm auf Zeichen \lstinline|c| löschen,\\

      also komplett mit diesem Zeichen (z.\,B.: Leerzeichen) füllen

    \item

      \lstinline|void put_point (int x, int y, char c)|\\

      Punkt setzen (z.\,B.\ einen Stern (\lstinline{*}) an die Stelle $(x,y)$ "`malen"')

    \item

      \lstinline|char get_point (int x, int y)|\\

      Punkt lesen

%    \item

%      \lstinline|void fill (int x, int y, char c, char o)|\\

%      Fläche in der "`Farbe"' \lstinline|o|,

%      die den Punkt \lstinline|(x, y)| enthält,

%      mit der "`Farbe"' \lstinline|c| ausmalen

    \item

      \lstinline|void display (void)|\\

      das Gezeichnete auf dem Bildschirm ausgeben

  \end{itemize}



  Hinweise:\vspace*{-\medskipamount}

  \begin{itemize}

    \item

      Eine C-Bibliothek besteht aus (mindestens)

      einer \file{.h}-Datei und einer \file{.c}-Datei.

    \item

      Verwenden Sie ein Array als "`Bildschirm"'.



      Vor dem Aufruf der Funktion \lstinline|display()| ist nichts zu sehen;\\

      alle Grafikoperationen erfolgen auf dem Array.

    \item

      Verwenden Sie Präprozessor-Konstante,

      z.\,B.\ \lstinline{WIDTH} und \lstinline{HEIGHT},\\

      um Höhe und Breite des "`Bildschirms"' festzulegen.

    \item

     Schreiben Sie zusätzlich ein Test-Programm,

     das alle Funktionen der Bibliothek benutzt,\\

     um ein hübsches Bild (z.\,B.\ ein stilisiertes Gesicht -- "`Smiley"')

     auszugeben.

  \end{itemize}



%  \points{10}

%  \points{8}  % ohne "fill()"



\end{document}

20171106/opengl-magic.c

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#if defined(__APPLE__) || defined(MACOSX)

  #include <OpenGL/gl.h>

  #include <OpenGL/glu.h>

  #include <GLUT/glut.h>

#else

  #include <GL/gl.h>

  #include <GL/glu.h>

  #include <GL/glut.h>

#endif



#include "opengl-magic.h"



void init_opengl (int *argcp, char **argv, char *window_name)

{

  glutInit (argcp, argv);

  glutInitDisplayMode (GLUT_RGBA | GLUT_DOUBLE | GLUT_DEPTH);

  glutInitWindowSize (1024, 768);

  glutCreateWindow (window_name);

  glMatrixMode (GL_PROJECTION);

  glLoadIdentity ();

  gluPerspective (20.0, -1.33333, 3.0, 7.0);

  glMatrixMode (GL_MODELVIEW);

  glLoadIdentity ();

  glTranslatef (0.0, 0.0, -5.0);

  glClearColor (0.0, 0.0, 0.0, 0.0);

  glEnable (GL_DEPTH_TEST);

  glEnable (GL_LIGHTING);

  glEnable (GL_LIGHT0);

  static GLfloat light0_position[] = { 1.0, 0.0, 1.0, 0.0 };

  glLightfv (GL_LIGHT0, GL_POSITION, light0_position);

}



void set_material_color (float r, float g, float b)

{

  GLfloat color[] = { r, g, b };

  glMaterialfv (GL_FRONT, GL_AMBIENT, color);

  glMaterialfv (GL_FRONT, GL_DIFFUSE, color);

}



#if defined(__APPLE__) || defined(MACOSX)



void glutSolidCylinder (double radius, double height, int slices, int stacks)

{

  GLUquadricObj *q = gluNewQuadric ();

  gluCylinder (q, radius, radius, height, slices, stacks);

  gluDeleteQuadric (q);

}



#endif

20171106/opengl-magic.h

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Original line number Diff line number Diff line 
#ifndef OPENGL_MAGIC_H

#define OPENGL_MAGIC_H



extern void init_opengl (int *argcp, char **argv, char *window_name);

extern void set_material_color (float r, float g, float b);



#ifdef __MACOSX__

  extern void glutSolidCylinder (double radius, double height, int slices, int stacks);

#endif



#endif /* OPENGL_MAGIC_H */

20171106/pendulum-1.c

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Original line number Diff line number Diff line 
#include <GL/gl.h>

#include <GL/glu.h>

#include <GL/freeglut.h>

#include <math.h>

#include "opengl-magic.h"



#define phi0 1.0    /* geg. Anfangswert */

#define omega0 0.0  /* geg. Anfangswert */

#define dt 0.05

#define g 9.81

#define l 1.0



double t = 0.0;

double phi = phi0;

double omega = omega0;



void draw (void)

{

  glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

  set_material_color (0.8, 0.8, 1.0);

  glPushMatrix ();

  glRotatef (90, 1.0, 0.0, 0.0);

  glTranslatef (0.0, 0.0, -0.75);

  glRotatef (180.0 + phi / M_PI * 180.0, 0.0, 1.0, 0.0);

  glTranslatef (0.0, 0.0, -1.0);

  glutSolidCylinder (0.01, l, 13, 1);

  glutSolidSphere (0.1, 31, 10);

  glPopMatrix ();

  glFlush ();

  glutSwapBuffers ();

}



void timer_handler (int value)

{

  t += dt;

  glutPostRedisplay ();

  glutTimerFunc (50, timer_handler, 0);

}



int main (int argc, char **argv)

{

  init_opengl (&argc, argv, "Pendulum");

  glutDisplayFunc (draw);

  glutTimerFunc (50, timer_handler, 0);

  glutMainLoop ();

  return 0;

}

20171106/pendulum-2.c

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Original line number Diff line number Diff line 
#include <GL/gl.h>

#include <GL/glu.h>

#include <GL/freeglut.h>

#include <math.h>

#include "opengl-magic.h"



#define phi0 1.0    /* geg. Anfangswert */

#define omega0 0.0  /* geg. Anfangswert */

#define dt 0.05

#define g 9.81

#define l 1.0



double t = 0.0;

double phi = phi0;

double omega = omega0;



void draw (void)

{

  glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

  set_material_color (0.8, 0.8, 1.0);

  glPushMatrix ();

  glRotatef (90, 1.0, 0.0, 0.0);

  glTranslatef (0.0, 0.0, -0.75);

  glRotatef (180.0 + phi / M_PI * 180.0, 0.0, 1.0, 0.0);

  glTranslatef (0.0, 0.0, -1.0);

  glutSolidCylinder (0.01, l, 13, 1);

  glutSolidSphere (0.1, 31, 10);

  glPopMatrix ();

  glFlush ();

  glutSwapBuffers ();

}



void timer_handler (int value)

{

  t += dt;

  phi += dt * omega;

  omega += dt * (-g / l) * sin (phi);

  glutPostRedisplay ();

  glutTimerFunc (50, timer_handler, 0);

}



int main (int argc, char **argv)

{

  init_opengl (&argc, argv, "Pendulum");

  glutDisplayFunc (draw);

  glutTimerFunc (50, timer_handler, 0);

  glutMainLoop ();

  return 0;

}

20171106/pendulum-3.c

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Original line number Diff line number Diff line 
#include <GL/gl.h>

#include <GL/glu.h>

#include <GL/freeglut.h>

#include <math.h>

#include "opengl-magic.h"



#define phi0 1.0    /* geg. Anfangswert */

#define omega0 0.0  /* geg. Anfangswert */

#define dt 0.05

#define g 9.81

#define l 1.0



double t = 0.0;

double phi = phi0;

double omega = omega0;



void draw (void)

{

  glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

  set_material_color (1.0, 1.0, 0.8);

  glPushMatrix ();

  glRotatef (90, 1.0, 0.0, 0.0);

  glTranslatef (0.0, 0.0, -0.75);

  glRotatef (180.0 + phi / M_PI * 180.0, 0.0, 1.0, 0.0);

  glTranslatef (0.0, 0.0, -1.0);

  glutSolidCylinder (0.01, l, 13, 1);

  glutSolidSphere (0.1, 31, 10);

  glPopMatrix ();

  glFlush ();

  glutSwapBuffers ();

}



void timer_handler (int value)

{

  t += dt;

  phi += dt * omega;

  omega += dt * (-g / l) * phi;

  glutPostRedisplay ();

  glutTimerFunc (50, timer_handler, 0);

}



int main (int argc, char **argv)

{

  init_opengl (&argc, argv, "Pendulum");

  glutDisplayFunc (draw);

  glutTimerFunc (50, timer_handler, 0);

  glutMainLoop ();

  return 0;

}

20171106/pendulum-4.c

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Original line number Diff line number Diff line 
#include <GL/gl.h>

#include <GL/glu.h>

#include <GL/freeglut.h>

#include <math.h>

#include "opengl-magic.h"



#define phi0 0.5    /* geg. Anfangswert */

#define omega0 0.0  /* geg. Anfangswert */

#define dt 0.05

#define g 9.81

#define l 1.0



double t = 0.0;

double phi_with_sin = phi0;

double omega_with_sin= omega0;

double phi_without_sin = phi0;

double omega_without_sin= omega0;



void draw_pendulum (double phi)

{

  glPushMatrix ();

  glRotatef (90, 1.0, 0.0, 0.0);

  glTranslatef (0.0, 0.0, -0.75);

  glRotatef (180.0 + phi / M_PI * 180.0, 0.0, 1.0, 0.0);

  glTranslatef (0.0, 0.0, -1.0);

  glutSolidCylinder (0.01, 1.0, 13, 1);

  glutSolidSphere (0.1, 31, 10);

  glPopMatrix ();

  glutSwapBuffers ();

}



void draw (void)

{

  glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

  set_material_color (0.8, 0.8, 1.0);

  draw_pendulum (phi_with_sin);

  set_material_color (1.0, 0.8, 0.8);

  draw_pendulum (phi_without_sin);

  set_material_color (0.8, 1.0, 0.8);

  double A = phi0;

  double B = 0.5 * M_PI;  /* 90° */

  double phi_analytic = A * sin (sqrt (g / l) * t + B);

  draw_pendulum (phi_analytic);

  glFlush ();

}



void timer_handler (int value)

{

  t += dt;

  phi_with_sin += dt * omega_with_sin;                   /* geg. Differentialgleichung */

  omega_with_sin += - dt * g / l * sin (phi_with_sin);   /* geg. Differentialgleichung */

                                                         /* _ohne_ Kleinwinkelnäherung */

  phi_without_sin += dt * omega_without_sin;             /* geg. Differentialgleichung */

  omega_without_sin += - dt * g / l * phi_without_sin;   /* geg. Differentialgleichung */

                                                         /* _mit_ Kleinwinkelnäherung  */

  glutPostRedisplay ();

  glutTimerFunc (50, timer_handler, 0);

}



int main (int argc, char **argv)

{

  init_opengl (&argc, argv, "Pendulum");

  glutDisplayFunc (draw);

  glutTimerFunc (50, timer_handler, 0);

  glutPostRedisplay ();

  glutMainLoop ();

  return 0;

}

20171106/photo-20171106-170748.txt

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Original line number Diff line number Diff line 
README: Fadenpendel: Aufstellung der Differentialgleichung

20171106/textured-spheres.c

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Original line number Diff line number Diff line 
#include <stdio.h>

#include <stdlib.h>

#include <sys/stat.h>

#include <png.h>

#include "textured-spheres.h"



#ifndef __USE_POSIX

  extern int fileno (FILE *stream);

#endif



static png_byte *load_png_file (char *filename, unsigned *w, unsigned *h)

{

  FILE *f = fopen (filename, "rb");

  if (!f)

    return NULL;



  /* is it a PNG file? */

  png_byte buf[8];

  if (fread (buf, 1, 8, f) != 8)

    {

      fclose (f);

      return NULL;

    }

  if (!png_check_sig (buf, 8))

    {

      fclose (f);

      return NULL;

    }



  png_struct *png_ptr = png_create_read_struct (PNG_LIBPNG_VER_STRING,

                                                NULL, NULL, NULL);

  if (!png_ptr)

    {

      fclose (f);

      return NULL;

    }



  png_info *info_ptr = png_create_info_struct (png_ptr);

  if (!info_ptr)

    {

      fclose (f);

      png_destroy_read_struct (&png_ptr, NULL, NULL);

      return NULL;

    }



  if (setjmp (png_jmpbuf (png_ptr)))

    {

      fclose (f);

      png_destroy_read_struct (&png_ptr, &info_ptr, NULL);

      return NULL;

    }



  png_init_io (png_ptr, f);

  png_set_sig_bytes (png_ptr, 8);

  png_read_info (png_ptr, info_ptr);



  png_uint_32 width;

  png_uint_32 height;

  int bit_depth;

  int color_type;

  png_get_IHDR (png_ptr, info_ptr, &width, &height, &bit_depth,

                &color_type, NULL, NULL, NULL);



  /* tell libpng to strip 16 bit/color files down to 8 bits/color */

  if (bit_depth == 16)

    png_set_strip_16 (png_ptr);

  /* expand paletted colors into true RGB triplets */

  if (color_type == PNG_COLOR_TYPE_PALETTE)

    png_set_expand (png_ptr);

  /* expand grayscale images to the full 8 bits from 1, 2, or 4 bits/pixel */

  if (color_type == PNG_COLOR_TYPE_GRAY && bit_depth < 8)

    png_set_expand (png_ptr);

  /* expand paletted or RGB images with transparency to full alpha channels

     so the data will be available as RGBA quartets. */

  if (png_get_valid (png_ptr, info_ptr, PNG_INFO_tRNS))

    png_set_expand (png_ptr);

  /* transform grayscale images into rgb */

  if (color_type == PNG_COLOR_TYPE_GRAY

      || color_type == PNG_COLOR_TYPE_GRAY_ALPHA)

    png_set_gray_to_rgb (png_ptr);



  if (color_type & PNG_COLOR_MASK_ALPHA)

    png_set_strip_alpha (png_ptr);



  png_read_update_info (png_ptr, info_ptr);

  png_get_IHDR (png_ptr, info_ptr, &width, &height, &bit_depth,

		&color_type, NULL, NULL, NULL);

  if (color_type != PNG_COLOR_TYPE_RGB

      && color_type != PNG_COLOR_TYPE_RGB_ALPHA)

    {

      fclose (f);

      png_destroy_read_struct (&png_ptr, &info_ptr, NULL);

      return NULL;

    }



  png_uint_32 row_bytes = png_get_rowbytes (png_ptr, info_ptr);

  if (row_bytes & 0x01)

    row_bytes++;



  png_byte *png_pixels = malloc (row_bytes * height * sizeof (png_byte));

  if (png_pixels == NULL)

    {

      fclose (f);

      png_destroy_read_struct (&png_ptr, &info_ptr, NULL);

      return NULL;

    }



  png_byte **row_pointers = malloc (height * sizeof (png_bytep));

  if (row_pointers == NULL)

    {

      fclose (f);

      png_destroy_read_struct (&png_ptr, &info_ptr, NULL);

      free (png_pixels);

      png_pixels = NULL;

      return NULL;

    }



  int i;

  for (i = 0; i < height; i++)

    row_pointers[i] = png_pixels + i * row_bytes;



  png_read_image (png_ptr, row_pointers);



  png_read_end (png_ptr, info_ptr);

  png_destroy_read_struct (&png_ptr, &info_ptr, NULL);

  fclose (f);



  if (w)

    *w = width;

  if (h)

    *h = height;

  free (row_pointers);



  return png_pixels;

}



void init_texture (char *image_filename, GLuint *texture)

{

  unsigned image_width, image_height;

  png_byte *image = load_png_file (image_filename, &image_width, &image_height);

  if (!image)

    {

      fprintf (stderr, "textured-spheres.c: cannot open texture file \"%s\"",

               image_filename);

      exit (1);

    }

  glGenTextures (1, texture);

  glBindTexture (GL_TEXTURE_2D, *texture);

  glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);

  glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR_MIPMAP_LINEAR);

  glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);

  glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);

  glTexEnvf (GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);

  gluBuild2DMipmaps (GL_TEXTURE_2D, 3, image_width, image_height, GL_RGB, GL_UNSIGNED_BYTE, image);

}



void draw_textured_sphere (GLuint texture, GLdouble radius, GLint slices, GLint stacks)

{

  static GLfloat white_color[] = { 1.0, 1.0, 1.0 };

  glMaterialfv (GL_FRONT, GL_AMBIENT, white_color);

  glMaterialfv (GL_FRONT, GL_DIFFUSE, white_color);

  glBindTexture (GL_TEXTURE_2D, texture);

  glEnable (GL_TEXTURE_2D);

  GLUquadric *sphere = gluNewQuadric ();

  gluQuadricTexture (sphere, GL_TRUE);

  gluSphere (sphere, radius, slices, stacks);

  glDisable (GL_TEXTURE_2D);

}

20171106/textured-spheres.h

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Original line number Diff line number Diff line 
#ifndef TEXTURED_SPHERES_H

#define TEXTURED_SPHERES_H



#include <GL/gl.h>

#include <GL/glu.h>



extern void init_texture (char *image_filename, GLuint *texture);

extern void draw_textured_sphere (GLuint texture, GLdouble radius, GLint slices, GLint stacks);



#endif /* TEXTURED_SPHERES_H */

20171108/egal.txt

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Original line number Diff line number Diff line 
GNU/Linux

~~~~~~~~~

Compilieren:  gcc -Wall -O cube-3c.c opengl-magic.c \

              -lGL -lGLU -lglut -o cube-3c

Aufrufen:     ./cube-3c



MacOS

~~~~~

Compilieren:  gcc -Wall -O cube-3c.c opengl-magic.c \

              -framework OpenGL -framework GLUT -o cube-3c

Aufrufen:     ./cube-3c



Cygwin mit X11

~~~~~~~~~~~~~~

Compilieren:  gcc -Wall -O cube-3c.c opengl-magic.c \

              -lGL -lGLU -lglut -o cube-3c

Aufrufen:     DISPLAY=:0.0 ./cube-3c

oder:

  einmalig:   export DISPLAY=:0.0

  danach:     ./cube-3c



Vorher einmalig: X-Server starten

              XWin -multiwindow &



Cygwin ohne X11

~~~~~~~~~~~~~~~

Compilieren:  i686-pc-mingw32-gcc -I freeglut/include -L freeglut/lib \

              -Wall -O cube-3c.c opengl-magic.c \

              -lOpenGL32 -lGLU32 -lfreeglut -o cube-3c

Aufrufen:     ./cube-3c



MinGW ohne X11

~~~~~~~~~~~~~~

Compilieren:  gcc -I freeglut/include -L freeglut/lib \

              -Wall -O cube-3c.c opengl-magic.c \

              -lOpenGL32 -lGLU32 -lfreeglut -o cube-3c

Aufrufen:     ./cube-3c

20171108/hp-2017ws-p2.tex

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Original line number Diff line number Diff line 
% hp-2017ws-p2.pdf - Labor Notes on Low-Level Programming

% Copyright (C) 2014, 2015, 2016, 2017  Peter Gerwinski

%

% This document is free software: you can redistribute it and/or

% modify it either under the terms of the Creative Commons

% Attribution-ShareAlike 3.0 License, or under the terms of the

% GNU General Public License as published by the Free Software

% Foundation, either version 3 of the License, or (at your option)

% any later version.

%

% This document is distributed in the hope that it will be useful,

% but WITHOUT ANY WARRANTY; without even the implied warranty of

% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

% GNU General Public License for more details.

%

% You should have received a copy of the GNU General Public License

% along with this document.  If not, see <http://www.gnu.org/licenses/>.

%

% You should have received a copy of the Creative Commons

% Attribution-ShareAlike 3.0 Unported License along with this

% document.  If not, see <http://creativecommons.org/licenses/>.



% README: Versuch 2, 8. und 15.11.2017: Basketball-Simulation



\documentclass[a4paper]{article}



\usepackage{pgscript}

\usepackage{multicol}

\usepackage{amsmath}

\usepackage{sfmath}



\sloppy

\pagestyle{empty}

\newcommand{\sep}{~$\cdot$~}

\newcommand{\mylicense}{CC-by-sa (Version 3.0) oder GNU GPL (Version 3 oder höher)}



\begin{document}



  \makebox(0,0)[tl]{\includegraphics[scale=0.57]{logo-hochschule-bochum-cvh-text.pdf}}\hfill

  \makebox(0,0)[tr]{\includegraphics[scale=0.5]{logo-hochschule-bochum.pdf}}

  \par\bigskip\bigskip

  \begin{center}

    \Large\textbf{Praktikumsversuch 2: Basketball-Simulation}

    \par\medskip

    \normalsize Hardwarenahe Programmierung / Angewandte Informatik\\

    Wintersemester 2017/18\sep

    Prof.~Dr.~Peter Gerwinski

  \end{center}



  Aufgabe: Schreiben Sie ein C-Programm, das

  den schrägen Wurf einer Kugel ("`Basketball"')

  durch einen horizontalen Ring ("`Korb"') simuliert und visualisiert

  -- sowohl ohne als auch mit Berücksichtigung der Luftreibung.



  \bigskip



  Hinweise:

  \vspace*{-\medskipamount}



  \begin{multicols}{2}



    \begin{itemize}

      \item

        Die Beispielprogramme \file{pendulum-}\lstinline{*}\file{.c} zeigen,

        wie eine Simulation mit Visualisierung

        mit Hilfe der 3d-Grafikbibliothek OpenGL

        programmiert werden kann.



      \item

        Als Basketball eignet sich eine Kugel;

        alternativ ist auch eine Teekanne zulässig.

        Als Basketballkorb eignet sich ein Ring (Torus).



      \item

        Zum Verschieben der gezeichneten Gegenstände

        im dreidimensionalen Zeichenraum

        eignet sich die Funktion \lstinline{glTranslatef()}.

        Genau wie \lstinline{glRotatef()} wirkt sich auch \lstinline{glTranslatef()}

        auf \emph{alle nachfolgenden\/} Zeichenoperationen aus,

        und der Wirkungsbereich läßt sich mit

        \lstinline{glPushMatrix()} und \lstinline{glPopMatrix()} begrenzen.



      \item

        \textbf{Bonus:}

        Zusätzliche Elemente wie z.\,B.\ das Abprallen des Balls am Brett,

        an der Wand oder auf dem Boden sind optional.



        Falls Sie über eine Textur für den Basketball verfügen,

        zeigt Ihnen das Beispielprogramm \file{orbit-1.c},

        wie Sie den Ball damit ausstatten können.



      \vfill\columnbreak



      \item

        In der Differentialgleichung (Bewegungsgleichung) für einen schrägen Wurf

        sind die $x$- und $y$-Komponente entkoppelt.



      \item

        In beiden Komponenten gibt es jeweils einen Anfangsort

        und eine Anfangsgeschwindigkeit.



      \item

        Bei Vernachlässigung der Luftreibung

        wirkt in $x$-Richtung keinerlei Kraft;

        in $y$-Richtung wirkt die Schwerkraft $F = m\cdot g$

        mit $g = 9.81\frac{\text{m}}{\text{s}^2}$.



      \item

        Die Luftreibung wirkt grundsätzlich der Bewegung entgegengerichtet.

        Wir nehmen an, daß die Stärke der Reibungskraft

        proportional zur Geschwindigkeit ist (laminarer Strömungswiderstand).



      \item

        Auch bei der Reibungskraft

        können Sie die $x$- und $y$-Komponente entkoppelt rechnen.



    \end{itemize}



    \bigskip



    \strut\hfill\emph{Viel Erfolg!}

    \vfill\strut



  \end{multicols}



  \vfill



  \begingroup



    \small



    \setlength{\leftskip}{3cm}



    Stand: 6.\ November 2017



%    Soweit nicht anders angegeben:\\

    Copyright \copyright\ 2014, 2015, 2016, 2017\quad Peter Gerwinski\\

    Lizenz: \mylicense



    Sie können diese Praktikumsunterlagen einschließlich Quelltext

%    und Beispielprogramme\\

    herunterladen unter:\\

    \url{https://gitlab.cvh-server.de/pgerwinski/hp}



  \endgroup



\end{document}

20171108/opengl-magic.c

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Original line number Diff line number Diff line 
#if defined(__APPLE__) || defined(MACOSX)

  #include <OpenGL/gl.h>

  #include <OpenGL/glu.h>

  #include <GLUT/glut.h>

#else

  #include <GL/gl.h>

  #include <GL/glu.h>

  #include <GL/glut.h>

#endif



#include "opengl-magic.h"



void init_opengl (int *argcp, char **argv, char *window_name)

{

  glutInit (argcp, argv);

  glutInitDisplayMode (GLUT_RGBA | GLUT_DOUBLE | GLUT_DEPTH);

  glutInitWindowSize (1024, 768);

  glutCreateWindow (window_name);

  glMatrixMode (GL_PROJECTION);

  glLoadIdentity ();

  gluPerspective (20.0, -1.33333, 3.0, 7.0);

  glMatrixMode (GL_MODELVIEW);

  glLoadIdentity ();

  glTranslatef (0.0, 0.0, -5.0);

  glClearColor (0.0, 0.0, 0.0, 0.0);

  glEnable (GL_DEPTH_TEST);

  glEnable (GL_LIGHTING);

  glEnable (GL_LIGHT0);

  static GLfloat light0_position[] = { 1.0, 0.0, 1.0, 0.0 };

  glLightfv (GL_LIGHT0, GL_POSITION, light0_position);

}



void set_material_color (float r, float g, float b)

{

  GLfloat color[] = { r, g, b };

  glMaterialfv (GL_FRONT, GL_AMBIENT, color);

  glMaterialfv (GL_FRONT, GL_DIFFUSE, color);

}



#if defined(__APPLE__) || defined(MACOSX)



void glutSolidCylinder (double radius, double height, int slices, int stacks)

{

  GLUquadricObj *q = gluNewQuadric ();

  gluCylinder (q, radius, radius, height, slices, stacks);

  gluDeleteQuadric (q);

}



#endif

20171108/opengl-magic.h

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Original line number Diff line number Diff line 
#ifndef OPENGL_MAGIC_H

#define OPENGL_MAGIC_H



extern void init_opengl (int *argcp, char **argv, char *window_name);

extern void set_material_color (float r, float g, float b);



#ifdef __MACOSX__

  extern void glutSolidCylinder (double radius, double height, int slices, int stacks);

#endif



#endif /* OPENGL_MAGIC_H */

20171108/orbit-1.c

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Original line number Diff line number Diff line 
#include <GL/gl.h>

#include <GL/glu.h>

#include <GL/glut.h>

#include "opengl-magic.h"

#include "textured-spheres.h"



float t = 0.0;

GLuint earth_texture, moon_texture;



void draw_earth (void)

{

  glPushMatrix ();

  glRotatef (90, 1.0, 0.0, 0.0);

  glRotatef (100.0 * t, 0.0, 0.0, 1.0);

  draw_textured_sphere (earth_texture, 0.25512, 63, 20);

  glPopMatrix ();

}



void draw_moon (void)

{

  glPushMatrix ();

  glRotatef (90, 1.0, 0.0, 0.0);

  glRotatef (-90, 0.0, 0.0, 1.0);

  draw_textured_sphere (moon_texture, 0.06952, 31, 10);

  glPopMatrix ();

}



void draw (void)

{

  glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

  glPushMatrix ();

  glRotatef (23.44, 1.0, 0.0, -1.0);

  draw_earth ();

  glRotatef (5.145, 0.0, 1.0, 1.0);

  glRotatef (30.0 * t, 0.0, -1.0, 0.0);

  glTranslatef (0.9, 0.0, 0.0);

  draw_moon ();

  glPopMatrix ();

  glFlush ();

  glutSwapBuffers ();

}



void timer_handler (int value)

{

  t += 0.05;

  glutPostRedisplay ();

  glutTimerFunc (50, timer_handler, 0);

}



int main (int argc, char **argv)

{

  init_opengl (&argc, argv, "Orbit");

  init_texture ("earth-texture.png", &earth_texture);

  init_texture ("moon-texture.png", &moon_texture);

  glutDisplayFunc (draw);

  glutTimerFunc (50, timer_handler, 0);

  glutMainLoop ();

  return 0;

}

20171108/pendulum-1.c

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Original line number Diff line number Diff line 
#include <GL/gl.h>

#include <GL/glu.h>

#include <GL/freeglut.h>

#include <math.h>

#include "opengl-magic.h"



#define phi0 1.0    /* geg. Anfangswert */

#define omega0 0.0  /* geg. Anfangswert */

#define dt 0.05

#define g 9.81

#define l 1.0



double t = 0.0;

double phi = phi0;

double omega = omega0;



void draw (void)

{

  glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

  set_material_color (0.8, 0.8, 1.0);

  glPushMatrix ();

  glRotatef (90, 1.0, 0.0, 0.0);

  glTranslatef (0.0, 0.0, -0.75);

  glRotatef (180.0 + phi / M_PI * 180.0, 0.0, 1.0, 0.0);

  glTranslatef (0.0, 0.0, -1.0);

  glutSolidCylinder (0.01, l, 13, 1);

  glutSolidSphere (0.1, 31, 10);

  glPopMatrix ();

  glFlush ();

  glutSwapBuffers ();

}



void timer_handler (int value)

{

  t += dt;

  glutPostRedisplay ();

  glutTimerFunc (50, timer_handler, 0);

}



int main (int argc, char **argv)

{

  init_opengl (&argc, argv, "Pendulum");

  glutDisplayFunc (draw);

  glutTimerFunc (50, timer_handler, 0);

  glutMainLoop ();

  return 0;

}

20171108/pendulum-2.c

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Original line number Diff line number Diff line 
#include <GL/gl.h>

#include <GL/glu.h>

#include <GL/freeglut.h>

#include <math.h>

#include "opengl-magic.h"



#define phi0 1.0    /* geg. Anfangswert */

#define omega0 0.0  /* geg. Anfangswert */

#define dt 0.05

#define g 9.81

#define l 1.0



double t = 0.0;

double phi = phi0;

double omega = omega0;



void draw (void)

{

  glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

  set_material_color (0.8, 0.8, 1.0);

  glPushMatrix ();

  glRotatef (90, 1.0, 0.0, 0.0);

  glTranslatef (0.0, 0.0, -0.75);

  glRotatef (180.0 + phi / M_PI * 180.0, 0.0, 1.0, 0.0);

  glTranslatef (0.0, 0.0, -1.0);

  glutSolidCylinder (0.01, l, 13, 1);

  glutSolidSphere (0.1, 31, 10);

  glPopMatrix ();

  glFlush ();

  glutSwapBuffers ();

}



void timer_handler (int value)

{

  t += dt;

  phi += dt * omega;

  omega += dt * (-g / l) * sin (phi);

  glutPostRedisplay ();

  glutTimerFunc (50, timer_handler, 0);

}



int main (int argc, char **argv)

{

  init_opengl (&argc, argv, "Pendulum");

  glutDisplayFunc (draw);

  glutTimerFunc (50, timer_handler, 0);

  glutMainLoop ();

  return 0;

}

20171108/pendulum-3.c

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Original line number Diff line number Diff line 
#include <GL/gl.h>

#include <GL/glu.h>

#include <GL/freeglut.h>

#include <math.h>

#include "opengl-magic.h"



#define phi0 1.0    /* geg. Anfangswert */

#define omega0 0.0  /* geg. Anfangswert */

#define dt 0.05

#define g 9.81

#define l 1.0



double t = 0.0;

double phi = phi0;

double omega = omega0;



void draw (void)

{

  glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

  set_material_color (1.0, 1.0, 0.8);

  glPushMatrix ();

  glRotatef (90, 1.0, 0.0, 0.0);

  glTranslatef (0.0, 0.0, -0.75);

  glRotatef (180.0 + phi / M_PI * 180.0, 0.0, 1.0, 0.0);

  glTranslatef (0.0, 0.0, -1.0);

  glutSolidCylinder (0.01, l, 13, 1);

  glutSolidSphere (0.1, 31, 10);

  glPopMatrix ();

  glFlush ();

  glutSwapBuffers ();

}



void timer_handler (int value)

{

  t += dt;

  phi += dt * omega;

  omega += dt * (-g / l) * phi;

  glutPostRedisplay ();

  glutTimerFunc (50, timer_handler, 0);

}



int main (int argc, char **argv)

{

  init_opengl (&argc, argv, "Pendulum");

  glutDisplayFunc (draw);

  glutTimerFunc (50, timer_handler, 0);

  glutMainLoop ();

  return 0;

}

20171108/pendulum-4.c

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Original line number Diff line number Diff line 
#include <GL/gl.h>

#include <GL/glu.h>

#include <GL/freeglut.h>

#include <math.h>

#include "opengl-magic.h"



#define phi0 0.5    /* geg. Anfangswert */

#define omega0 0.0  /* geg. Anfangswert */

#define dt 0.05

#define g 9.81

#define l 1.0



double t = 0.0;

double phi_with_sin = phi0;

double omega_with_sin= omega0;

double phi_without_sin = phi0;

double omega_without_sin= omega0;



void draw_pendulum (double phi)

{

  glPushMatrix ();

  glRotatef (90, 1.0, 0.0, 0.0);

  glTranslatef (0.0, 0.0, -0.75);

  glRotatef (180.0 + phi / M_PI * 180.0, 0.0, 1.0, 0.0);

  glTranslatef (0.0, 0.0, -1.0);

  glutSolidCylinder (0.01, 1.0, 13, 1);

  glutSolidSphere (0.1, 31, 10);

  glPopMatrix ();

  glutSwapBuffers ();

}



void draw (void)

{

  glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

  set_material_color (0.8, 0.8, 1.0);

  draw_pendulum (phi_with_sin);

  set_material_color (1.0, 0.8, 0.8);

  draw_pendulum (phi_without_sin);

  set_material_color (0.8, 1.0, 0.8);

  double A = phi0;

  double B = 0.5 * M_PI;  /* 90° */

  double phi_analytic = A * sin (sqrt (g / l) * t + B);

  draw_pendulum (phi_analytic);

  glFlush ();

}



void timer_handler (int value)

{

  t += dt;

  phi_with_sin += dt * omega_with_sin;                   /* geg. Differentialgleichung */

  omega_with_sin += - dt * g / l * sin (phi_with_sin);   /* geg. Differentialgleichung */

                                                         /* _ohne_ Kleinwinkelnäherung */

  phi_without_sin += dt * omega_without_sin;             /* geg. Differentialgleichung */

  omega_without_sin += - dt * g / l * phi_without_sin;   /* geg. Differentialgleichung */

                                                         /* _mit_ Kleinwinkelnäherung  */

  glutPostRedisplay ();

  glutTimerFunc (50, timer_handler, 0);

}



int main (int argc, char **argv)

{

  init_opengl (&argc, argv, "Pendulum");

  glutDisplayFunc (draw);

  glutTimerFunc (50, timer_handler, 0);

  glutPostRedisplay ();

  glutMainLoop ();

  return 0;

}

20171108/textured-spheres.c

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Original line number Diff line number Diff line 
#include <stdio.h>

#include <stdlib.h>

#include <sys/stat.h>

#include <png.h>

#include "textured-spheres.h"



#ifndef __USE_POSIX

  extern int fileno (FILE *stream);

#endif



static png_byte *load_png_file (char *filename, unsigned *w, unsigned *h)

{

  FILE *f = fopen (filename, "rb");

  if (!f)

    return NULL;



  /* is it a PNG file? */

  png_byte buf[8];

  if (fread (buf, 1, 8, f) != 8)

    {

      fclose (f);

      return NULL;

    }

  if (!png_check_sig (buf, 8))

    {

      fclose (f);

      return NULL;

    }



  png_struct *png_ptr = png_create_read_struct (PNG_LIBPNG_VER_STRING,

                                                NULL, NULL, NULL);

  if (!png_ptr)

    {

      fclose (f);

      return NULL;

    }



  png_info *info_ptr = png_create_info_struct (png_ptr);

  if (!info_ptr)

    {

      fclose (f);

      png_destroy_read_struct (&png_ptr, NULL, NULL);

      return NULL;

    }



  if (setjmp (png_jmpbuf (png_ptr)))

    {

      fclose (f);

      png_destroy_read_struct (&png_ptr, &info_ptr, NULL);

      return NULL;

    }



  png_init_io (png_ptr, f);

  png_set_sig_bytes (png_ptr, 8);

  png_read_info (png_ptr, info_ptr);



  png_uint_32 width;

  png_uint_32 height;

  int bit_depth;

  int color_type;

  png_get_IHDR (png_ptr, info_ptr, &width, &height, &bit_depth,

                &color_type, NULL, NULL, NULL);



  /* tell libpng to strip 16 bit/color files down to 8 bits/color */

  if (bit_depth == 16)

    png_set_strip_16 (png_ptr);

  /* expand paletted colors into true RGB triplets */

  if (color_type == PNG_COLOR_TYPE_PALETTE)

    png_set_expand (png_ptr);

  /* expand grayscale images to the full 8 bits from 1, 2, or 4 bits/pixel */

  if (color_type == PNG_COLOR_TYPE_GRAY && bit_depth < 8)

    png_set_expand (png_ptr);

  /* expand paletted or RGB images with transparency to full alpha channels

     so the data will be available as RGBA quartets. */

  if (png_get_valid (png_ptr, info_ptr, PNG_INFO_tRNS))

    png_set_expand (png_ptr);

  /* transform grayscale images into rgb */

  if (color_type == PNG_COLOR_TYPE_GRAY

      || color_type == PNG_COLOR_TYPE_GRAY_ALPHA)

    png_set_gray_to_rgb (png_ptr);



  if (color_type & PNG_COLOR_MASK_ALPHA)

    png_set_strip_alpha (png_ptr);



  png_read_update_info (png_ptr, info_ptr);

  png_get_IHDR (png_ptr, info_ptr, &width, &height, &bit_depth,

		&color_type, NULL, NULL, NULL);

  if (color_type != PNG_COLOR_TYPE_RGB

      && color_type != PNG_COLOR_TYPE_RGB_ALPHA)

    {

      fclose (f);

      png_destroy_read_struct (&png_ptr, &info_ptr, NULL);

      return NULL;

    }



  png_uint_32 row_bytes = png_get_rowbytes (png_ptr, info_ptr);

  if (row_bytes & 0x01)

    row_bytes++;



  png_byte *png_pixels = malloc (row_bytes * height * sizeof (png_byte));

  if (png_pixels == NULL)

    {

      fclose (f);

      png_destroy_read_struct (&png_ptr, &info_ptr, NULL);

      return NULL;

    }



  png_byte **row_pointers = malloc (height * sizeof (png_bytep));

  if (row_pointers == NULL)

    {

      fclose (f);

      png_destroy_read_struct (&png_ptr, &info_ptr, NULL);

      free (png_pixels);

      png_pixels = NULL;

      return NULL;

    }



  int i;

  for (i = 0; i < height; i++)

    row_pointers[i] = png_pixels + i * row_bytes;



  png_read_image (png_ptr, row_pointers);



  png_read_end (png_ptr, info_ptr);

  png_destroy_read_struct (&png_ptr, &info_ptr, NULL);

  fclose (f);



  if (w)

    *w = width;

  if (h)

    *h = height;

  free (row_pointers);



  return png_pixels;

}



void init_texture (char *image_filename, GLuint *texture)

{

  unsigned image_width, image_height;

  png_byte *image = load_png_file (image_filename, &image_width, &image_height);

  if (!image)

    {

      fprintf (stderr, "textured-spheres.c: cannot open texture file \"%s\"",

               image_filename);

      exit (1);

    }

  glGenTextures (1, texture);

  glBindTexture (GL_TEXTURE_2D, *texture);

  glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);

  glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR_MIPMAP_LINEAR);

  glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);

  glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);

  glTexEnvf (GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);

  gluBuild2DMipmaps (GL_TEXTURE_2D, 3, image_width, image_height, GL_RGB, GL_UNSIGNED_BYTE, image);

}



void draw_textured_sphere (GLuint texture, GLdouble radius, GLint slices, GLint stacks)

{

  static GLfloat white_color[] = { 1.0, 1.0, 1.0 };

  glMaterialfv (GL_FRONT, GL_AMBIENT, white_color);

  glMaterialfv (GL_FRONT, GL_DIFFUSE, white_color);

  glBindTexture (GL_TEXTURE_2D, texture);

  glEnable (GL_TEXTURE_2D);

  GLUquadric *sphere = gluNewQuadric ();

  gluQuadricTexture (sphere, GL_TRUE);

  gluSphere (sphere, radius, slices, stacks);

  glDisable (GL_TEXTURE_2D);

}

20171108/textured-spheres.h

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#ifndef TEXTURED_SPHERES_H

#define TEXTURED_SPHERES_H



#include <GL/gl.h>

#include <GL/glu.h>



extern void init_texture (char *image_filename, GLuint *texture);

extern void draw_textured_sphere (GLuint texture, GLdouble radius, GLint slices, GLint stacks);



#endif /* TEXTURED_SPHERES_H */

20171113/aufgabe-3.c

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#include <GL/gl.h>

#include <GL/glu.h>

#include <GL/glut.h>

#include "opengl-magic.h"



float t = 0.0;



void draw (void)

{

  glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

  set_material_color (1.0, 0.7, 0.0);

  glRotatef (t, 0.5, 1.0, 0.0);

  glutSolidCube (0.5);

  glFlush ();

  glutSwapBuffers ();

}



void timer_handler (int value)

{

  t += 0.05;

  glutPostRedisplay ();

  glutTimerFunc (50, timer_handler, 0);

}



int main (int argc, char **argv)

{

  init_opengl (&argc, argv, "Cube");

  glutMainLoop ();

  glutTimerFunc (50, timer_handler, 0);

  return 0;

}

20171113/cube-1.c

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#include <GL/gl.h>

#include <GL/glu.h>

#include <GL/glut.h>

#include "opengl-magic.h"



void draw (void)

{

  glClear (GL_COLOR_BUFFER_BIT + GL_DEPTH_BUFFER_BIT);

  set_material_color (1.0, 0.7, 0.0);

  glutSolidCube (0.75);

  glFlush ();

  glutSwapBuffers ();

}



int main (int argc, char **argv)

{

  init_opengl (&argc, argv, "Cube");

  glutDisplayFunc (draw);

  glutMainLoop ();

  return 0;

}

20171113/cube-2.c

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#include <GL/gl.h>

#include <GL/glu.h>

#include <GL/glut.h>

#include "opengl-magic.h"



void draw (void)

{

  glClear (GL_COLOR_BUFFER_BIT + GL_DEPTH_BUFFER_BIT);

  set_material_color (1.0, 0.7, 0.0);

  glRotatef (-30.0, 0.5, 1.0, 0.0);

  glutSolidCube (0.75);

  glFlush ();

  glutSwapBuffers ();

}



int main (int argc, char **argv)

{

  init_opengl (&argc, argv, "Cube");

  glutDisplayFunc (draw);

  glutMainLoop ();

  return 0;

}

20171113/cube-3.c

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#include <GL/gl.h>

#include <GL/glu.h>

#include <GL/glut.h>

#include "opengl-magic.h"



float t = 0.0;



void draw (void)

{

  glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

  set_material_color (1.0, 0.7, 0.0);

  glRotatef (t, 0.5, 1.0, 0.0);

  glutSolidCube (0.5);

  glFlush ();

  glutSwapBuffers ();

}



void timer_handler (int value)

{

  t += 0.05;

  glutPostRedisplay ();

  glutTimerFunc (50, timer_handler, 0);

}



int main (int argc, char **argv)

{

  init_opengl (&argc, argv, "Cube");

  glutDisplayFunc (draw);

  glutTimerFunc (50, timer_handler, 0);

  glutMainLoop ();

  return 0;

}

20171113/cube-4.c

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#include <GL/gl.h>

#include <GL/glu.h>

#include <GL/glut.h>

#include "opengl-magic.h"



float t = 0.0;



void draw (void)

{

  glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

  set_material_color (1.0, 0.7, 0.0);

  glPushMatrix ();

  glRotatef (t, 0.5, 1.0, 0.0);

  glutSolidCube (0.5);

  glPopMatrix ();

  glFlush ();

  glutSwapBuffers ();

}



void timer_handler (int value)

{

  t += 0.05;

  glutPostRedisplay ();

  glutTimerFunc (50, timer_handler, 0);

}



int main (int argc, char **argv)

{

  init_opengl (&argc, argv, "Cube");

  glutDisplayFunc (draw);

  glutTimerFunc (50, timer_handler, 0);

  glutMainLoop ();

  return 0;

}

20171113/cube-5.c

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#include <GL/gl.h>

#include <GL/glu.h>

#include <GL/glut.h>

#include "opengl-magic.h"



float t = 0.0;



void draw (void)

{

  glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

  set_material_color (1.0, 0.7, 0.0);

  glPushMatrix ();

  glRotatef (20.0 * t, 0.5, 1.0, 0.0);

  glutSolidCube (0.5);

  glPopMatrix ();

  glFlush ();

  glutSwapBuffers ();

}



void timer_handler (int value)

{

  t += 0.05;

  glutPostRedisplay ();

  glutTimerFunc (50, timer_handler, 0);

}



int main (int argc, char **argv)

{

  init_opengl (&argc, argv, "Cube");

  glutDisplayFunc (draw);

  glutTimerFunc (50, timer_handler, 0);

  glutMainLoop ();

  return 0;

}

20171113/hp-20171113.tex

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20171113/hp-uebung-20171113.tex

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% hp-uebung-20171113.pdf - Exercises on Low-Level Programming / Applied Computer Sciences

% Copyright (C) 2013, 2015, 2016, 2017  Peter Gerwinski

%

% This document is free software: you can redistribute it and/or

% modify it either under the terms of the Creative Commons

% Attribution-ShareAlike 3.0 License, or under the terms of the

% GNU General Public License as published by the Free Software

% Foundation, either version 3 of the License, or (at your option)

% any later version.

%

% This document is distributed in the hope that it will be useful,

% but WITHOUT ANY WARRANTY; without even the implied warranty of

% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

% GNU General Public License for more details.

%

% You should have received a copy of the GNU General Public License

% along with this document.  If not, see <http://www.gnu.org/licenses/>.

%

% You should have received a copy of the Creative Commons

% Attribution-ShareAlike 3.0 Unported License along with this

% document.  If not, see <http://creativecommons.org/licenses/>.



% README: Datum-Bibliothek, Primzahlen, rotierender Würfel



\documentclass[a4paper]{article}



\usepackage{pgscript}



\begin{document}



%  \thispagestyle{empty}



  \section*{Hardwarenahe Programmierung / Angewandte Informatik\\

            Übungsaufgaben -- 13.\ November 2017}



  \exercise{Datum-Bibliothek}



  Schreiben Sie eine Bibliothek \file{dates.c} (mit Header-Datei \file{dates.h})

  zur Behandlung von Datumsangaben.



  Diese soll enthalten:

  \begin{itemize}

    \item

      einen \lstinline{struct}-Datentyp \lstinline{date},

      der eine Datumsangabe speichert,

    \item

      eine Funktion \lstinline{void date_print (date *d)}, die ein Datum ausgibt,

    \item

      eine Funktion \lstinline{int date_set (date *d, int day, int month, int year)},

      die ein Datum auf einen gegebenen Tag setzt

      und zurückgibt, ob es sich um ein gültiges Datum handelt (0 = nein, 1 = ja),

    \item

      eine Funktion \lstinline{void date_next (date *d)},

      die ein Datum auf den nächsten Tag vorrückt.

  \end{itemize}



  \exercise{Fehlerhaftes Programm: Primzahlen}



  \begin{minipage}[t]{5.5cm}

    Das nebenstehende Primzahlsuchprogramm (Datei: \gitfile{hp}{20171113}{aufgabe-2.c})

    soll Zahlen ausgeben, die genau zwei Teiler haben, ist aber fehlerhaft.



    \smallskip



    Korrigieren Sie das Programm derart, daß ein Programm entsteht,

    welches alle Primzahlen kleiner 100 ausgibt.% \points 5

  \end{minipage}\hfill

  \begin{minipage}[t]{9cm}

     \vspace*{-0.5cm}

    \begin{lstlisting}[gobble=6]

      #include <stdio.h>



      int main (void)

      {

        int n, i, divisors;

        for (n = 0; n < 100; n++)

          divisors = 0;

          for (i = 0; i < n; i++)

            if (n % i == 0)

              divisors++;

          if (divisors = 2)

            printf ("%d ist eine Primzahl.\n", n);

        return 0;

      }

    \end{lstlisting}

  \end{minipage}



  \exercise{Fehlerhaftes Programm: Rotierender Würfel}



  Das auf der nächsten Seite abgedruckte OpenGL-Programm

  (Datei: \gitfile{hp}{20171113}{aufgabe-3.c}) soll einen sich

  gleichmäßig drehenden Würfel darstellen, ist jedoch fehlerhaft.



  (Die Datei \gitfile{hp}{20171113}{opengl-magic.h} sowie die zugehörige C-Datei

  \gitfile{hp}{20171113}{opengl-magic.c} sind die aus der Vorlesung bekannten Beispiel-Dateien,

  die Sie zusammen mit diesen Übungsaufgaben herunterladen können.)



  \begin{itemize}

    \item[(a)]

      Warum sieht man lediglich ein leeres Fenster?

      Welchen Befehl muß man ergänzen, um diesen Fehler zu beheben?

%      \points{4}

  \end{itemize}



  Nach der Fehlerbehebung in Aufgabenteil (a)

  zeigt das Programm einen sich drehenden Würfel.



%  (Sie können sich diesen während der Klausur jederzeit vorführen lassen.)



  \begin{itemize}

    \item[(b)]

      Erklären Sie das Drehverhalten des Würfels. % \points{4}

    \item[(c)]

      Welche Befehle muß man ergänzen,

      um eine gleichförmige Drehung zu erhalten? % \points{4}

  \end{itemize}



  \filbreak



  \begin{lstlisting}

    #include <GL/gl.h>

    #include <GL/glu.h>

    #include <GL/glut.h>

    #include "opengl-magic.h"



    float t = 0.0;



    void draw (void)

    {

      glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

      set_material_color (1.0, 0.7, 0.0);

      glRotatef (t, 0.5, 1.0, 0.0);

      glutSolidCube (0.5);

      glFlush ();

      glutSwapBuffers ();

    }



    void timer_handler (int value)

    {

      t += 0.05;

      glutPostRedisplay ();

      glutTimerFunc (50, timer_handler, 0);

    }



    int main (int argc, char **argv)

    {

      init_opengl (&argc, argv, "Cube");

      glutMainLoop ();

      glutTimerFunc (50, timer_handler, 0);

      return 0;

    }

  \end{lstlisting}



\end{document}

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#include <stdio.h>



#define VIER 4



int main (void)

{

  printf ("%d\n", VIER);

  return 0;

}

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#include <stdio.h>



#define VIER 4;



int main (void)

{

  printf ("%d\n", VIER);

  return 0;

}

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#include <stdio.h>



#define VIER 2 + 2



int main (void)

{

  printf ("%d\n", VIER);

  return 0;

}

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#include <stdio.h>



#define VIER 2 + 2



int main (void)

{

  printf ("3 * 4 = %d\n", 3 * VIER);

  return 0;

}

20171113/macros-5.c

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#include <stdio.h>



#define VIER (2 + 2)



int main (void)

{

  printf ("3 * 4 = %d\n", 3 * VIER);

  return 0;

}

20171113/main-5.c

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#include <stdio.h>



int main (int argc, char **argv)

{

  printf ("argc = %d\n", argc);

  for (int i = 0; i < 4; i++)

    printf ("argv[%d] = %s\n", i, argv[i]);

  return 0;

}

20171113/opengl-magic.c

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#if defined(__APPLE__) || defined(MACOSX)

  #include <OpenGL/gl.h>

  #include <OpenGL/glu.h>

  #include <GLUT/glut.h>

#else

  #include <GL/gl.h>

  #include <GL/glu.h>

  #include <GL/glut.h>

#endif



#include "opengl-magic.h"



void init_opengl (int *argcp, char **argv, char *window_name)

{

  glutInit (argcp, argv);

  glutInitDisplayMode (GLUT_RGBA | GLUT_DOUBLE | GLUT_DEPTH);

  glutInitWindowSize (1024, 768);

  glutCreateWindow (window_name);

  glMatrixMode (GL_PROJECTION);

  glLoadIdentity ();

  gluPerspective (20.0, -1.33333, 3.0, 7.0);

  glMatrixMode (GL_MODELVIEW);

  glLoadIdentity ();

  glTranslatef (0.0, 0.0, -5.0);

  glClearColor (0.0, 0.0, 0.0, 0.0);

  glEnable (GL_DEPTH_TEST);

  glEnable (GL_LIGHTING);

  glEnable (GL_LIGHT0);

  static GLfloat light0_position[] = { 1.0, 0.0, 1.0, 0.0 };

  glLightfv (GL_LIGHT0, GL_POSITION, light0_position);

}



void set_material_color (float r, float g, float b)

{

  GLfloat color[] = { r, g, b };

  glMaterialfv (GL_FRONT, GL_AMBIENT, color);

  glMaterialfv (GL_FRONT, GL_DIFFUSE, color);

}



#if defined(__APPLE__) || defined(MACOSX)



void glutSolidCylinder (double radius, double height, int slices, int stacks)

{

  GLUquadricObj *q = gluNewQuadric ();

  gluCylinder (q, radius, radius, height, slices, stacks);

  gluDeleteQuadric (q);

}



#endif

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