最简单的opengl动画

//左键旋转  中间减停止
#include "stdafx.h"
#include<GL/glut.h>
static GLfloat spin=0.0;
void init()
{
glClearColor(0.0,0.0,0.0,0.0);
glShadeModel(GL_FLAT);
// glMatrixMode(GL_PROJECTION);
// gluOrtho2D(0.0,200.0,0.0,150.0);
}
void myDisplay()
{
glClear(GL_COLOR_BUFFER_BIT);
glPushMatrix();
glRotatef(spin,0.0,0.0,1.0);
glColor3f(1.0,1.0,1.0);
glRectf(-25.0,-25.0,25.0,25.0);
glPopMatrix();
glutSwapBuffers();
}
void spinDisplay()
{
spin=spin+2.0;
if(spin>360.0)
spin=spin-360.0;
glutPostRedisplay();
}
void reshape(int w,int h)
{
glViewport(0,0,(GLsizei)w,(GLsizei)h);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(-50.0,50.0,-50.0,50.0,-1.0,1.0);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
}
void mouse(int button,int state,int x,int y)
{
switch(button)
{
case GLUT_LEFT_BUTTON:
if(state==GLUT_DOWN)
glutIdleFunc(spinDisplay);
break;
case GLUT_MIDDLE_BUTTON:
if(state==GLUT_DOWN)
glutIdleFunc(NULL);
break;
default:
break;
}
}
int main(int argc, char *argv[])
{
glutInit(&argc, argv);
glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE);
glutInitWindowPosition(100, 100);
glutInitWindowSize(250, 250);
glutCreateWindow(argv[0]);
init();
glutDisplayFunc(myDisplay);
glutReshapeFunc(reshape);
glutMouseFunc(mouse);
glutMainLoop();
return 0;
}