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绘制一个红色填充色的矩形(Windows_glut)

#include <gl\glut.h>
#include <windows.h>
#include <gl\GL.h>
#include <gl\GLU.h>


void Initial(void)
{
    glClearColor(1.0f,1.0f,1.0f,1.0f);
    glMatrixMode(GL_PROJECTION);
    gluOrtho2D(0.0, 200.0, 0.0, 150.0);
}

void Display(void)
{
    glClear(GL_COLOR_BUFFER_BIT);
    glColor3f(1.0f, 0.0f, 0.0f);
    glRectf(50.f, 100.0f, 150.0f, 50.0f);
    glFlush();
}


int main(int argc, char* argv[])
{
	glutInit(&argc, argv);
    glutInitDisplayMode(GLUT_SINGLE|GLUT_RGB);
    glutInitWindowSize(400, 300);
	glutInitWindowPosition(100, 120);
    glutCreateWindow("矩形");
    glutDisplayFunc(Display);
    Initial();
    glutMainLoop();
    return 0;
}

OpenGL__简单实例