使用VS2012 C++ 绘制中国国旗

#include <GL/glut.h>
#include <math.h>

void init (void)
{
glClearColor(1.0,1.0,1.0,1.0);  //窗口背景设置为白色
glMatrixMode(GL_PROJECTION);    //设置投影参数
gluOrtho2D(0.0,200.0,0.0,150.0);
}

void TRIANGLE(float i,float j,int r)
{     float PI = 3.14;
float ax,ay,bx,by,cx,cy,dx,dy,ex,ey;
ax=0;
ay=r;
bx=r*cos(18*PI/180);
by=r*sin(18*PI/180);
ex=-bx;
ey=by;
cx=r*sin(36*PI/180);
cy=-r*cos(36*PI/180);
dx=-cx;
dy=cy;

glColor3f(1.0,1.0,0.0);
glBegin(GL_TRIANGLES);
glVertex2i(i,j);
glVertex2i(i+ax,j+ay);
glVertex2i(i+dx,j+dy);
glEnd();

glBegin(GL_TRIANGLES);
glVertex2i(i,j);
glVertex2i(i+ax,j+ay);
glVertex2i(i+cx,j+cy);
glEnd();

glBegin(GL_TRIANGLES);
glVertex2i(i,j);
glVertex2i(i+bx,j+by);
glVertex2i(i+ex,j+ey);
glEnd();

glBegin(GL_TRIANGLES);
glVertex2i(i,j);
glVertex2i(i+bx,j+by);
glVertex2i(i+dx,j+dy);
glEnd();

glBegin(GL_TRIANGLES);
glVertex2i(i,j);
glVertex2i(i+cx,j+cy);
glVertex2i(i+ex,j+ey);
glEnd();

}

void flagSegment(void)
{ glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

glColor3f(1.0,0.0,0.0);        //颜色为红色
glBegin(GL_QUADS);
glVertex2i(13,140);
glVertex2i(100,140);
glVertex2i(100,80);
glVertex2i(13,80);
glEnd();

TRIANGLE(28,123,9);

glTranslatef(40.0f,135.0f,0.0f);
glPushMatrix();
glRotatef(-30.0f,0.0f,0.0f,1.0f);
TRIANGLE(0,0,4);
glPopMatrix();

glTranslatef(7.0f,-7.0f,0.0f);
glPushMatrix();
glRotatef(30.0f,0.0f,0.0f,1.0f);
TRIANGLE(0,0,4);
glPopMatrix();

glTranslatef(0.0f,-10.0f,0.0f);
TRIANGLE(0,0,4);
glTranslatef(-7.0f,-6.0f,0.0f);
glPushMatrix();
glRotatef(-30.0f,0.0f,0.0f,1.0f);
TRIANGLE(0,0,4);
glPopMatrix();
glFlush();                     //渲染
}

int main (int argc,char** argv)
{
glutInit(&argc,argv);                         //初始化GLUT
glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);  //设置显示模式
glutInitWindowPosition(100,100);               //设置显示窗口的左上角位置
glutInitWindowSize(800,600);                  //设置窗口的长和高
glutCreateWindow("An Example OpenGL Program" );     //创造显示窗口
init();                                       //开始初始化过程
glutDisplayFunc(flagSegment); //发送图形到显示窗口
//glutReshapeFunc(reshape);
glutMainLoop();              //显示所有并等候
return 0;

}