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#include<GL/glut.h>

void myinit(void);
void display(void);

void main(int argc, char **argv)
{
        glutInit(&argc, argv);
        glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);
        glutInitWindowSize(500, 500);
        glutInitWindowPosition(0, 0);
        glutCreateWindow("Simple OpenGL example");
        glutDisplayFunc(display);
        myinit();
        glutMainLoop();
}

void myinit(void)
{
        glClearColor(1.0, 1.0, 1.0, 0.0);
        glColor3f(1.0, 0.0, 0.0);

        glMatrixMode(GL_PROJECTION);
        glLoadIdentity();
        gluOrtho2D(0.0, 500.0, 0.0, 500.0);
        glMatrixMode(GL_MODELVIEW);
}

void display(void)
{
        typedef GLfloat point2[2];

        point2 vertices[3] = { {0.0, 0.0}, {250.0, 500.0}, {500.0, 0.0} };

        int i, j, k;
        int rand();
        point2 p = {75.0, 50.0};
        glClear(GL_COLOR_BUFFER_BIT);

        for(k=0; k<500; k++)
        {
                j = (rand()) % 3;

                p[0] = (p[0]+vertices[j][0])/2.0;
                p[1] = (p[1]+vertices[j][1])/2.0;

                glBegin(GL_POINTS);
                glVertex2fv(p);
                glEnd();
        }

        glFlush();
}


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