#include <windows.h>//#include <GLUT/glut.h>#include <GL/glut.h>#include <math.h>#include <iostream>using namespace std;#define GL_PI 3.1415fvoid RenderScene(){    glClear(GL_COLOR_BUFFER_BIT);    GLfloat y;    GLint factor = 1;    GLushort pattern = 0x5555;    GLfloat sizes[2],curSize;    glGetFloatv(GL_LINE_WIDTH_RANGE,sizes);    glEnable(GL_LINE_STIPPLE);    curSize = sizes[0];    for(y = -90.0f;y < 90.0f;y += 20.0f)    {        glLineStipple(factor,pattern);        glLineWidth(curSize);        glBegin(GL_LINES);            glVertex2f(-80.0f,y);            glVertex2f(80.0f,y);        glEnd();        curSize += 1.0f;        factor++;    }    glFlush();}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(-100,100,-100/aspectRatio,100/aspectRatio,100.0,-100.0);    else        glOrtho(-100*aspectRatio,100*aspectRatio,-100,100,100.0,-100.0);    glMatrixMode(GL_MODELVIEW);    glLoadIdentity();}void SetupRC(){    glClearColor(0.0f,0.0f,0.0f,1.0f);    glColor3f(1.0f,0.0f,0.0f);}int main(int argc, char *argv[]){   glutInit(&argc,argv);   glutInitDisplayMode(GLUT_SINGLE|GLUT_RGB);   glutInitWindowSize(800,600);   glutCreateWindow("Simple");   glutDisplayFunc(RenderScene);   glutReshapeFunc(ChangeSize);   SetupRC();   glutMainLoop();   return 0;}