菱形图案

#include
#include
#include
#include
#define SIZE 50
const int screenWidth=1366;
const int screenHeight=768;
void myInit()
{
    glClearColor(1.0,1.0,1.0,0.0);//背景颜色为白
 glClear(GL_COLOR_BUFFER_BIT);
    glColor3f(0.0f,0.0f,0.0f);//画图颜色为黑
    glLineWidth(1.0);//画线线粗大小
    glMatrixMode(GL_PROJECTION);//设置"相机形状"
    glLoadIdentity();
    gluOrtho2D(0.0,(GLdouble)screenWidth,0.0,(GLdouble)screenHeight);
}
void myDisplay()
{
int i,j;
 glClearColor(1.0,1.0,1.0,0.0);
 glClear(GL_COLOR_BUFFER_BIT);
 for(i=0;i<30;i+=2)
  for(j=0;j<18;j+=2)
  {
   if((i+j)%2==0)
   {
             glColor3f(0.6,0.6,0.6);
             glBegin(GL_POLYGON);
            glVertex2d(i*SIZE-SIZE,j*SIZE);
            glVertex2d(i*SIZE,j*SIZE-SIZE);
               glVertex2d(i*SIZE+SIZE,j*SIZE);
            glVertex2d(i*SIZE,j*SIZE+SIZE);
          glEnd();
          glFlush();
   }
   else
               {
             glColor3f(0.2,0.2,0.2);
             glBegin(GL_POLYGON);
            glVertex2d(i*SIZE-SIZE,j*SIZE);
            glVertex2d(i*SIZE,j*SIZE-SIZE);
               glVertex2d(i*SIZE+SIZE,j*SIZE);
            glVertex2d(i*SIZE,j*SIZE+SIZE);
          glEnd();
          glFlush();
   }
  }
}
void main(int argc,char** argv)
{
   glutInit(&argc,argv);  //初始化工具包
   glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);//设置显示模式
   glutInitWindowSize(screenWidth,screenHeight);//设置窗口大小
   glutInitWindowPosition(0,0);//设置窗口在屏幕上的位置
   glutCreateWindow("OpenGL DEMO");
   glutDisplayFunc(myDisplay);//注册重画函数
   myInit();
   glutMainLoop();
}



 

 

#include
#include
#include
#include
#define SIZE 50
const int screenWidth=1366;
const int screenHeight=768;
void myInit()
{
    glClearColor(1.0,1.0,1.0,0.0);//背景颜色为白
 glClear(GL_COLOR_BUFFER_BIT);
    glColor3f(0.0f,0.0f,0.0f);//画图颜色为黑
    glLineWidth(1.0);//画线线粗大小
    glMatrixMode(GL_PROJECTION);//设置"相机形状"
    glLoadIdentity();
    gluOrtho2D(0.0,(GLdouble)screenWidth,0.0,(GLdouble)screenHeight);
}
void myDisplay()
{
int i,j;
 glClearColor(1.0,1.0,1.0,0.0);
 glClear(GL_COLOR_BUFFER_BIT);
 for(i=0;i<30;i+=2)
  for(j=0;j<18;j+=2)
  {
   if((i+j)%4==0)
   {
             glColor3f(0.6,0.6,0.6);
             glBegin(GL_POLYGON);
            glVertex2d(i*SIZE-SIZE,j*SIZE);
            glVertex2d(i*SIZE,j*SIZE-SIZE);
               glVertex2d(i*SIZE+SIZE,j*SIZE);
            glVertex2d(i*SIZE,j*SIZE+SIZE);
          glEnd();
          glFlush();
   }
   else
               {
             glColor3f(1.0,0.0,0.30);
             glBegin(GL_POLYGON);
            glVertex2d(i*SIZE-SIZE,j*SIZE);
            glVertex2d(i*SIZE,j*SIZE-SIZE);
               glVertex2d(i*SIZE+SIZE,j*SIZE);
            glVertex2d(i*SIZE,j*SIZE+SIZE);
          glEnd();
          glFlush();
   }
  }
}
void main(int argc,char** argv)
{
   glutInit(&argc,argv);  //初始化工具包
   glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);//设置显示模式
   glutInitWindowSize(screenWidth,screenHeight);//设置窗口大小
   glutInitWindowPosition(0,0);//设置窗口在屏幕上的位置
   glutCreateWindow("OpenGL DEMO");
   glutDisplayFunc(myDisplay);//注册重画函数
   myInit();
   glutMainLoop();
}