OpenGL绘制移动的正方形

[happyjessica2008]

本人正在学习《OpenGL超级宝典》，其中的一个例子“程序清单2.3”都是按书上的内容输入的代码，可是没有效果，请高手帮忙看看错在哪里？最好能够把正确的代码给我，谢谢了。
附：这是一个控制台应用程序。

#include <windows.h>
#include <gl/glut.h>

GLfloat x1=100.0f;
GLfloat y1=150.0f;
GLfloat rsize=25;

GLfloat xstep=1.0f;
GLfloat ystep=1.0f;

GLfloat windowWidth;
GLfloat windowHeight;

void RenderScene(void)
{
	glClear(GL_COLOR_BUFFER_BIT);
	glColor3f(1.0f,0.0f,0.0f);
	glRectf(x1,y1,x1+rsize,y1-rsize);
	glutSwapBuffers();   //刷新绘图命令，并进行交换
}

void SetupRC(void)
{
	glClearColor(0.0f,0.0f,1.0f,1.0f);
}

void TimerFunction(int value)
{
	if(x1>windowWidth-rsize||x1<-windowWidth)
		xstep=-xstep;
	if(y1>windowHeight||y1<-windowHeight+rsize)
		ystep=-ystep;

	x1+=xstep;
	y1+=ystep;

	if(x1>(windowWidth-rsize+xstep))
		x1=windowWidth-rsize-1;
	else if(x1<-(windowWidth+xstep))
		x1=-windowWidth-1;

    if(y1>(windowHeight+ystep))
		y1=windowHeight-1;
	else if(y1<-(windowHeight-rsize+ystep))
		y1=-windowHeight+rsize-1;

	glutPostRedisplay();
	glutTimerFunc(33,TimerFunction,1);
}

void ChangeSize(GLsizei w,GLsizei h)
{   
	if(h==0) h=1;
	glViewport(0,0,w,h);
	glMatrixMode(GL_PROJECTION);
	glLoadIdentity();
	if(w<=h)
	{
		windowHeight=250.0f*h/w;
		windowWidth=250.0f;
	}
	else
	{
        windowHeight=250.0f;
		windowWidth=250.0f*w/h;
	}
	glOrtho(0.0f,windowWidth,0.0f,windowHeight,1.0f,-1.0f);

    glMatrixMode(GL_MODELVIEW);
	glLoadIdentity();
}


int main(int argc,char* argv[])
{
	glutInit(&argc,argv);
	glutInitDisplayMode(GLUT_DOUBLE|GLUT_RGBA);
	glutInitWindowSize(800,600);
	glutCreateWindow("Bounce");

	glutDisplayFunc(RenderScene);
	glutReshapeFunc(ChangeSize);
	glutTimerFunc(33,TimerFunction,1);

	SetupRC();
	glutMainLoop();
	return 0;
}

[happyjessica2008]

回答dizuo：
绘制一个正方形是没有问题的，我这段程序就是由绘制正方形修改而来的，绘制正方形的代码如下：

#include <windows.h>
//#include <gl/gl.h>
//#include <gl/glu.h>
#include <gl/glut.h>

void RenderScene(void)
{
	glClear(GL_COLOR_BUFFER_BIT);
	glColor3f(1.0f,0.0f,0.0f);   //设置绘图颜色
	glRectf(-25.0f,25.0f,25.0f,-25.0f);   //绘制填充矩形
	glFlush();
}

void SetupRC(void)
{
	glClearColor(0.0f,0.0f,1.0f,1.0f);
}

void ChangeSize(GLsizei w,GLsizei h)
{   GLfloat aspectRatio;
	if(h==0) h=1;
	glViewport(0,0,w,h);

	//重新设置坐标系统
	glMatrixMode(GL_PROJECTION);
	glLoadIdentity();

	aspectRatio=(GLfloat)w/(GLfloat)h;
	if(w<=h)
		glOrtho(-100.0,100.0,-100/aspectRatio,100.0/aspectRatio,1.0,-1.0);
	else
        glOrtho(-100.0*aspectRatio,100.0*aspectRatio,-100,100.0,1.0,-1.0);
    glMatrixMode(GL_MODELVIEW);
	glLoadIdentity();
}

//void main(void)
int main(int argc,char* argv[])
{
	glutInit(&argc,argv);
	glutInitDisplayMode(GLUT_SINGLE|GLUT_RGBA);
	glutCreateWindow("GLRect");
	glutDisplayFunc(RenderScene);
	glutReshapeFunc(ChangeSize);   //当窗口大小改变时，重新设置坐标系统
	SetupRC();
	glutMainLoop();
	return 0;
}

[ryfdizuo]

可能是照相机的问题吧，先找一个可以运行的框架，
绘制出正方体，
然后在实现正方体移动，