#include <windows.h>//#include <GLUT/glut.h>#include <GL/glut.h>#include <iostream>using namespace std;GLfloat x1 = 0.0f;GLfloat y1 = 0.0f;GLfloat rsize = 25;GLfloat xstep = 1.0f;GLfloat ystep = 1.0f;GLfloat windowWidth;GLfloat windowHeight;void RenderScene(){    glClear(GL_COLOR_BUFFER_BIT);    glColor3f(1.0f,0.0f,0.0f);    cout<<"(x1,y1)= ("<<x1<<","<<y1<<")  (x2,y2)= ("<<(x1+rsize)<<","<<y1-rsize<<")"<<endl;    glRectf(x1,y1,x1+rsize,y1-rsize);    glutSwapBuffers();}void TimerFunction(int value){    cout<<"WindowWidth: "<<windowWidth<<" WindowHeight: "<<windowHeight<<endl;    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;    GLfloat aspectRatio = (GLfloat)w/(GLfloat)h;    glViewport(0,0,w,h);    glMatrixMode(GL_PROJECTION);    glLoadIdentity();    if(w<h)    {        glOrtho(-100.0,100.0,-100.0/aspectRatio,100.0/aspectRatio,1.0,-1.0);        windowWidth = 100;        windowHeight = 100/aspectRatio;    }    else    {        glOrtho(-100.0*aspectRatio,100.0*aspectRatio,-100.0,100.0,1.0,-1.0);        windowWidth = 100*aspectRatio;        windowHeight = 100;    }    glMatrixMode(GL_MODELVIEW);    glLoadIdentity();}void SetupRC(){    glClearColor(0.0f,0.0f,1.0f,1.0f);}int main(int argc, char *argv[]){   glutInit(&argc,argv);   glutInitDisplayMode(GLUT_DOUBLE|GLUT_RGB);   glutInitWindowSize(800,600);   glutCreateWindow("Simple");   glutDisplayFunc(RenderScene);   glutReshapeFunc(ChangeSize);   glutTimerFunc(33,TimerFunction,1);   SetupRC();   glutMainLoop();   return 0;}