一个简单的太阳，地球，月亮转动动画程序，代码如下：
#include
staticintday=200;//day的变化：从0到359
voidmyDisplay(void)
{
glEnable(GL_DEPTH_TEST);
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluPerspective(75,1,1,400000000);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
gluLookAt(0,-200000000,200000000,0,0,0,0,0,1);
//绘制红色的“太阳”
glColor3f(1.0f,0.0f,0.0f);
glutSolidSphere(69600000,20,20);
//绘制蓝色的“地球”
glColor3f(0.0f,0.0f,1.0f);
glRotatef(day/360.0*360.0,0.0f,0.0f,-1.0f);
glTranslatef(150000000,0.0f,0.0f);
glutSolidSphere(15945000,20,20);
//绘制黄色的“月亮”
glColor3f(1.0f,1.0f,0.0f);
glRotatef(day/30.0*360.0-day/360.0*360.0,0.0f,0.0f,-1.0f);
glTranslatef(38000000,0.0f,0.0f);
glutSolidSphere(4345000,20,20);
glFlush();
glutSwapBuffers();
}
voidmyIdle(void)
{
/*新的函数，在空闲时调用，作用是把日期往后移动一天并重新绘制，达到动画效果*/
++day;
if(day>=360)
day=0;
myDisplay();
}
intmain(intargc,char*argv[])
{
glutInit(&argc,argv);
glutInitDisplayMode(GLUT_RGB|GLUT_DOUBLE);//修改了参数为GLUT_DOUBLE
glutInitWindowPosition(100,100);
glutInitWindowSize(400,400);
glutCreateWindow("太阳，地球和月亮");//改了窗口标题
glutDisplayFunc(&myDisplay);
glutIdleFunc(&myIdle);//新加入了这句，在CPU空闲时调用myIdle函数
glutMainLoop();
return0;
}
运行无错误，但是弹出的窗口为黑屏，求解？？？
结果如下图：
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