OpenGL Win32 动画

#include <iostream>
#include <gl\glut.h>
#include <gl\GL.h>
#include <gl\GLU.h>

#include "base.h"
using namespace std;

int x, y;

void display(void)
{
    
    glClear(GL_COLOR_BUFFER_BIT);

    glPushMatrix();

    //glBegin(GL_TRIANGLES);
    glBegin(GL_QUADS);
    glVertex2d(x, y);
    glVertex2d(x + 35, y);
    glVertex2d(x + 35, y + 35);
    glVertex2d(x, y + 35);
    glEnd();

    glPopMatrix();
//glFlush();
    glutSwapBuffers();
}
void init()
{
    glClearColor (0.0, 0.0, 0.0, 0.0);
    glColor3f(1.0, 1.0, 1.0);

    x = y = 0;
}

void reshape(int w, int h)
{
    double d = MapHeight / 600.0 / 2;
    double dw = w / 2.0 * d;
    double dh = h / 2.0 * d;
    glViewport(0,0,w,h);
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    gluOrtho2D(-dw, dw, -dh, dh);
    glMatrixMode(GL_MODELVIEW);
    glLoadIdentity();
    glutPostRedisplay();
}

void onTimer(int value)
{
    printf("dfd\n");
    x += 10;

    // 重绘
    glutPostRedisplay();
    glutTimerFunc(50, onTimer, 0);
}

int main(int argc, char** argv)
{
    glutInit(&argc,argv);

    glutInitDisplayMode(GLUT_DOUBLE|GLUT_RGB);

    //    glutInitWindowSize(MapWidth,MapHeight);
    double radio = MapWidth * 1.0 / MapHeight;
    glutInitWindowSize(600 * radio,600);
    glutInitWindowPosition(0,0);
    glutCreateWindow("simple");

    glutDisplayFunc(display);
    glutReshapeFunc(reshape);
    glutTimerFunc(50, onTimer, 0);

    init();

    glutMainLoop();

    //system("pause");
}