OpenGL.rar_opengl有注释

#include <windows.h> #include <GL/glut.h> #include <winbase.h> static int sun_rotation; static int earth_rotation, earth_revolution, moon_rotation, moon_revolution; static int mars_rotation, mars_revolution; static int venus_rotation, venus_revolution; static GLfloat camera_x = 8.0, camera_y, camera_z; static GLfloat camera_obj_x, camera_obj_y, camera_obj_z; static GLfloat camera_step = 0.5; void Init(void) { glClearColor (0.0, 0.0, 0.0, 0.0); glShadeModel (GL_FLAT); } void Display(void) { glClear (GL_COLOR_BUFFER_BIT); glColor3f (1.0, 0.0, 0.0); glPushMatrix(); glRotatef((GLfloat)sun_rotation, 0.0, -1.0, 2.0); glRotatef(30.0, 1.0, 0.0, 0.0); // angle of the sun's axis glutWireSphere(1.0, 20, 16); glPopMatrix(); glPushMatrix(); glColor3f(0.0, 0.0, 1.0); glRotatef((GLfloat)earth_revolution, 0.0, 0.0, 1.0); glTranslatef(4.0, 0.0, 0.0); // distance between earth and sun glPushMatrix(); glRotatef((GLfloat)earth_rotation, 0.0, -1.0, 2.0); glRotatef(30, 1.0, 0.0, 0.0); // angle of the earth's axis glutWireSphere(0.2, 10, 8); glPopMatrix(); glColor3f(1.0, 1.0, 1.0); glRotatef((GLfloat)moon_revolution, 0.0, 1.0, 1.0); glTranslatef(0.5, 0.0, 0.0); // distance between earth and moon glutWireSphere(0.05, 5, 4); glPopMatrix(); glPopMatrix(); glPushMatrix(); glColor3f(1.0, 0.5, 0.2); glRotatef((GLfloat)mars_revolution, 0.0, 0.0, 1.0); glTranslatef(6.0, 0.0, 0.0); // distance between sun and mars glRotatef((GLfloat)mars_rotation, 0.0, -1.0, 1.0); glRotatef(45.0, 1.0, 0.0, 0.0); glutWireSphere(0.15, 8, 6); glPopMatrix(); glPushMatrix(); glColor3f(1.0, 1.0, 0.2); glRotatef((GLfloat)venus_revolution, 0.0, 0.0, 1.0); glTranslatef(3.0, 0, 0); glRotatef((GLfloat)venus_rotation, 0.0, 0.0, 1.0); glutWireSphere(0.2, 9, 7); glPopMatrix(); glutSwapBuffers(); } void Reshape(int w, int h) { glViewport(0, 0, (GLsizei)w, (GLsizei)h); glMatrixMode(GL_PROJECTION); glLoadIdentity(); gluPerspective(60.0, (GLfloat)w/(GLfloat)h, 1.0, 20.0); glMatrixMode(GL_MODELVIEW); glLoadIdentity(); gluLookAt(camera_x, camera_y, camera_z, camera_obj_x, camera_obj_y, camera_obj_z, 0.0, 0.0, 1.0); } void Keyboard(unsigned char key,int x,int y) { switch (key) { case 'w': camera_x -= camera_step; glLoadIdentity(); gluLookAt(camera_x, camera_y, camera_z, camera_obj_x, camera_obj_y, camera_obj_z, 0.0, 0.0, 1.0); glutPostRedisplay(); break; case 's': camera_x += camera_step; glLoadIdentity(); gluLookAt(camera_x, camera_y, camera_z, camera_obj_x, camera_obj_y, camera_obj_z, 0.0, 0.0, 1.0); glutPostRedisplay(); break; case 'a': camera_obj_y -= camera_step; glLoadIdentity(); gluLookAt(camera_x, camera_y, camera_z, camera_obj_x, camera_obj_y, camera_obj_z, 0.0, 0.0, 1.0); glutPostRedisplay(); break; case 'd': camera_obj_y += camera_step; glLoadIdentity(); gluLookAt(camera_x, camera_y, camera_z, camera_obj_x, camera_obj_y, camera_obj_z, 0.0, 0.0, 1.0); glutPostRedisplay(); break; case 27: exit(0); break; default: break; } } void SolarDisplay(void) { sun_rotation = (sun_rotation + 1) % 360; earth_rotation = (earth_rotation + 8) % 360; earth_revolution = (earth_revolution + 4) % 360; moon_revolution = (moon_revolution + 9) % 360; mars_revolution = (mars_revolution + 3) % 360; mars_rotation = (venus_rotation + 10) % 360; venus_revolution = (venus_revolution - 4) % 360; venus_rotation = (venus_rotation + 8) % 360; glutPostRedisplay(); Sleep(100); } int main(int argc, char** argv) { glutInit(&argc, argv); glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB); glutInitWindowSize(500, 500); glutInitWindowPosition(100, 100); glutCreateWindow(argv[0]); Init(); glutDisplayFunc(Display); glutReshapeFunc(Reshape); glutKeyboardFunc(Keyboard); glutIdleFunc(SolarDisplay); glutMainLoop(); return 0; }