Beispielprogramme und Tafelbild Klausurtutorium 31.1.2017

20161031/orbit-2.c

+#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);
+  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 ();
+  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;
+}

20161031/orbit-3.c

+#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)
+{
+  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);
+}
+
+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;
+}

20170130/fclose-1.c

+#include <stdio.h>
+
+int main (void)
+{
+  FILE *f = fopen ("fclose.txt", "w");
+  fprintf (f, "Hello, world!\n");
+  while (1);
+  return 0;
+}

20170130/fclose-2.c

+#include <stdio.h>
+
+int main (void)
+{
+  FILE *f = fopen ("fclose.txt", "w");
+  fprintf (f, "Hello, world!\n");
+  fclose (f);
+  while (1);
+  return 0;
+}