rotation translation order

Author: E-Adel

Tutorial-02/cube.c

@@ -38,23 +38,34 @@ void keyboard(unsigned char key, int x, int y)
 {
   switch (key)
   {
+  case '0':
+    translationx = 0.0;
+    rotation = 0.0;
+    rotateFirst = 0;
+    glutPostRedisplay();
+    break;
   case '1':
-    translationx += 0.01;
+    translationx += 0.05;
     glutPostRedisplay();
     break;
-  case '2':
-    scale *= 1.1;
+  case '!':
+    translationx -= 0.05;
     glutPostRedisplay();
     break;
-  case '3':
+  case '2':
     rotation += 5;
     glutPostRedisplay();
     break;
-  case '4':
-    if (rotateFirst == 0)
+  case '@':
+    rotation -= 5;
+    glutPostRedisplay();
+    break;
+  case '3':
       rotateFirst = 1;
-    else
+      break;
+  case '#':
       rotateFirst = 0;
+      break;
   }
 }
 void init()
@@ -67,7 +78,7 @@ void init()
   glEnable(GL_DEPTH_TEST);
 
   glMatrixMode(GL_PROJECTION);
-  gluPerspective(100.0, 1.0, 1.0, 10.0);
+  gluPerspective(50.0, 1.0, 1.0, 10.0);
   gluLookAt(eye[0], eye[1], eye[2],
             center[0], center[1], center[2],
             up[0], up[1], up[2]);

Tutorial-02/rotate_then_translate.c

@@ -0,0 +1,74 @@
+#include <GL/glut.h>
+
+float light_diffuse[] = {1.0, 0.0, 0.0, 1.0};   /* Red diffuse light. */
+float light_position[] = {-1.0, 1.0, 1.0, 0.0}; /* Infinite light location. */
+float eye[] = {0.0, 0.0, 5.0};
+float center[] = {0.0, 0.0, 0.0};
+float up[] = {0.0, 1.0, 0.0};
+float translationx = 0.0;
+float scale = 1;
+float rotation = 45.0;
+int rotateFirst = 0;
+
+void display()
+{
+  glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+
+  glLoadIdentity();
+  glTranslatef(1.0, 0.0, 0.0);
+  glRotatef(135.0, 0.0, 0.0, 1.0);
+  glutSolidCube(scale);
+  glutSwapBuffers();
+}
+
+void keyboard(unsigned char key, int x, int y)
+{
+  switch (key)
+  {
+  case '1':
+    translationx += 0.01;
+    glutPostRedisplay();
+    break;
+  case '2':
+    scale *= 1.1;
+    glutPostRedisplay();
+    break;
+  case '3':
+    rotation += 5;
+    glutPostRedisplay();
+    break;
+  case '4':
+    if (rotateFirst == 0)
+      rotateFirst = 1;
+    else
+      rotateFirst = 0;
+  }
+}
+void init()
+{
+  glLightfv(GL_LIGHT0, GL_DIFFUSE, light_diffuse);
+  glLightfv(GL_LIGHT0, GL_POSITION, light_position);
+  glEnable(GL_LIGHT0);
+  glEnable(GL_LIGHTING);
+
+  glEnable(GL_DEPTH_TEST);
+
+  glMatrixMode(GL_PROJECTION);
+  gluPerspective(50.0, 1.0, 1.0, 10.0);
+  gluLookAt(eye[0], eye[1], eye[2],
+            center[0], center[1], center[2],
+            up[0], up[1], up[2]);
+  glMatrixMode(GL_MODELVIEW);
+}
+
+int main(int argc, char **argv)
+{
+  glutInit(&argc, argv);
+  glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH);
+  glutCreateWindow("red 3D lighted cube");
+  glutDisplayFunc(display);
+  glutKeyboardFunc(keyboard);
+  init();
+  glutMainLoop();
+  return 0;
+}

Tutorial-02/translate_then_rotate.c

@@ -0,0 +1,74 @@
+#include <GL/glut.h>
+
+float light_diffuse[] = {1.0, 0.0, 0.0, 1.0};   /* Red diffuse light. */
+float light_position[] = {-1.0, 1.0, 1.0, 0.0}; /* Infinite light location. */
+float eye[] = {0.0, 0.0, 5.0};
+float center[] = {0.0, 0.0, 0.0};
+float up[] = {0.0, 1.0, 0.0};
+float translationx = 0.0;
+float scale = 1;
+float rotation = 45.0;
+int rotateFirst = 0;
+
+void display()
+{
+  glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+
+  glLoadIdentity();
+  glRotatef(135.0, 0.0, 0.0, 1.0);
+  glTranslatef(1.0, 0.0, 0.0);
+  glutSolidCube(scale);
+  glutSwapBuffers();
+}
+
+void keyboard(unsigned char key, int x, int y)
+{
+  switch (key)
+  {
+  case '1':
+    translationx += 0.01;
+    glutPostRedisplay();
+    break;
+  case '2':
+    scale *= 1.1;
+    glutPostRedisplay();
+    break;
+  case '3':
+    rotation += 5;
+    glutPostRedisplay();
+    break;
+  case '4':
+    if (rotateFirst == 0)
+      rotateFirst = 1;
+    else
+      rotateFirst = 0;
+  }
+}
+void init()
+{
+  glLightfv(GL_LIGHT0, GL_DIFFUSE, light_diffuse);
+  glLightfv(GL_LIGHT0, GL_POSITION, light_position);
+  glEnable(GL_LIGHT0);
+  glEnable(GL_LIGHTING);
+
+  glEnable(GL_DEPTH_TEST);
+
+  glMatrixMode(GL_PROJECTION);
+  gluPerspective(50.0, 1.0, 1.0, 10.0);
+  gluLookAt(eye[0], eye[1], eye[2],
+            center[0], center[1], center[2],
+            up[0], up[1], up[2]);
+  glMatrixMode(GL_MODELVIEW);
+}
+
+int main(int argc, char **argv)
+{
+  glutInit(&argc, argv);
+  glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH);
+  glutCreateWindow("red 3D lighted cube");
+  glutDisplayFunc(display);
+  glutKeyboardFunc(keyboard);
+  init();
+  glutMainLoop();
+  return 0;
+}