画棋盘

#include
#include
#include
#include
#define SIZE 40
void myInit()
{
  glClearColor(1.0,1.0,1.0,0.0);
  glColor3f(0.0f,0.0f,1.0f);
  //glPointSize(4.0);
  glLineWidth(1.0);
  glMatrixMode(GL_PROJECTION);
  glLoadIdentity();
  gluOrtho2D(0.0,640,0.0,480);
}
void myDisplay()
{
int i,j;
 glClearColor(1.0,1.0,1.0,0.0);
 glClear(GL_COLOR_BUFFER_BIT);
 for(i=0;i<16;i++)
  for(j=0;j<12;j++)
   {
     if((i+j)%2==0)
        {
           glColor3f(0.6,0.6,0.6);
           glRecti(i*SIZE,j*SIZE,i*SIZE+50,j*SIZE+50);
         }
     else
        {
        glColor3f(0.2,0.2,0.2);
           glRecti(i*SIZE,j*SIZE,i*SIZE+50,j*SIZE+50);
         }
    }
  glFlush();
}
void main(int argc,char** argv)
{
  glutInit(&argc,argv);
  glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);
  glutInitWindowSize(640,480);
  glutInitWindowPosition(100,150);
  glutCreateWindow("my first attempt");
  glutDisplayFunc(myDisplay);
  myInit();
  glutMainLoop();
}