1.程序代碼：

#include <vgl.h> static int year =0, day =0;void init(void) {glClearColor(0.0,0.0,1.0,0.0); //清除背景底色glShadeModel(GL_FLAT); } void display(void) {glClear(GL_COLOR_BUFFER_BIT);glColor3f(0.5,0.5,0.5); //相當于畫筆glPushMatrix(); glRotatef((GLfloat)year, 0.0, 1.0, 0.0);glutWireSphere(1,30,24); //sun: radius longtitude latitudeglPopMatrix(); glPushMatrix();glRotatef((GLfloat)year,-1,1,0);glTranslatef(3.0, 0.0, 0.0); glTranslatef(0.0, 3.0, 0.0); glRotatef((GLfloat)day, -1.0, 1.0, 0.0);glutWireSphere(0.3,10,8);glPopMatrix();glPushMatrix();glRotatef((GLfloat)year,1,1,0);glTranslatef(2.0,0.0,0.0); glTranslatef(0.0,-2.0,0.0); glRotatef((GLfloat)day,1,1,0);glutWireSphere(0.3,10,8);glPopMatrix();glutSwapBuffers(); }void reshape(int w,int h) {glViewport(0,0,(GLsizei)w,(GLsizei)h);glMatrixMode(GL_PROJECTION);glLoadIdentity();gluPerspective(60,(GLfloat)w/(GLfloat)h,1.0,20.0);glMatrixMode(GL_MODELVIEW);glLoadIdentity();gluLookAt(0.0,0.0,6.0,0.0,0.0,0.0,0.0,1.0,0.0 ); } void keyboard(unsigned char key, int x,int y) {switch(key){case 'd': day = (day+10) %360;glutPostRedisplay();break;case 'D': day = (day-10) %360;glutPostRedisplay();break;case 'y': year = (year+5) %360;glutPostRedisplay();break;case 'Y': year = (year-5) %360;glutPostRedisplay();break;default:break;} } int main(int argc, char** argv) {glutInit(&argc,argv);glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB);glutInitWindowSize(400,400);glutInitWindowPosition(200,200);glutCreateWindow(argv[0]);init();glutDisplayFunc(display);glutReshapeFunc(reshape);glutKeyboardFunc(keyboard);glutMainLoop();return 0; }

2.說出結果

總結

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