图案的简单绘制3

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#include <GL/glut.h>

void my(void)

{
 glClearColor(0.0, 0.0, 0.0, 0.0);
 glClear(GL_COLOR_BUFFER_BIT);

 glColor3f (1.0f, 0.4f, 1.0f); 
 glRectf(-0.5f, -0.5f, 0.5f, 0.5f);

 glBegin (GL_TRIANGLES);
 glColor3f (1.0f, 0.0f, 0.0f);   glVertex2f (0.0f, 1.0f);
 glColor3f (0.0f, 1.0f, 0.0f);   glVertex2f (0.8f, -0.5f);
 glColor3f (0.0f, 0.0f, 1.0f);   glVertex2f (-0.8f, -0.5f);
 glEnd ();

 glPointSize(3);
 glBegin (GL_POINTS);
 glColor3f (1.0f, 0.0f, 0.0f);   glVertex2f (-0.4f, -0.4f);
 glColor3f (0.0f, 1.0f, 0.0f);   glVertex2f (0.0f, 0.0f);
 glColor3f (0.0f, 0.0f, 1.0f);   glVertex2f (0.4f, 0.4f);
 glEnd ();

 glFlush();
}

int main(int argc, char *argv[])
{
    glutInit(&argc, argv);
    glutInitDisplayMode(GLUT_RGB | GLUT_SINGLE);
    glutInitWindowPosition(100, 100);
    glutInitWindowSize(400, 400);
    glutCreateWindow("Hello Opengl!");
    glutDisplayFunc(&my);
    glutMainLoop();
    return 0;
} 

运行截图：