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

void myinit(void)
	{
	/* ¼Ó¼ºµé */

		glClearColor(1.0, 1.0, 1.0, 0.0); /* Èò ¹è°æ */
		glColor3f(1.0, 0.0, 0.0); /* Àû»öÀ¸·Î ±×¸² */

	/* °üÃøÀÇ ¼³Á¤ */

		glMatrixMode(GL_PROJECTION);
		glLoadIdentity();
		gluOrtho2D(0.0, 500.0, 0.0, 500.0);
		glMatrixMode(GL_MODELVIEW);
	}	
void display(void)
	{
		typedef GLfloat point2[2]; /* Á¡ µ¥ÀÌÅÍ ÇüÀÇ Á¤ÀÇ */

		/* »ï°¢Çü */
		point2 vertices[3] = {{0.0, 0.0}, {250.0, 500.0}, {500.0, 0.0}}; 

		int j, k;
		/*long rand(); /* Ç¥ÁØ ³­¼ö ¹ß»ý±â */
		point2 p = {75.0, 50.0}; /* ÀÓÀÇÀÇ Á¡ */

		glClear(GL_COLOR_BUFFER_BIT); /* À©µµ¿ì¸¦ Áö¿ò */

	/* 5000 °³ÀÇ »õ·Î¿î Á¡À» °è»êÇÏ°í ±×¸² */
		for (k=0; k<5000; k++)
		{
			j = rand()%3; /* ÇϳªÀÇ Á¤Á¡À» ¹«ÀÛÀ§·Î ¼±Åà */

		/* Á¤Á¡°ú ÀÌÀüÀÇ Á¡ÀÇ ÁßÁ¡À» °è»ê */
			p[0] = (p[0]+vertices[j][0])/2.0;
			p[1] = (p[1]+vertices[j][1])/2.0;

		/* Á¡À» ±×¸² */
			glBegin(GL_POINTS);
				glVertex2fv(p);
			glEnd();
		}
		glFlush();
	}
	void main(int argc, char **argv)
	{
		glutInit(&argc, argv);
		glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);
		glutInitWindowSize(500, 500);
		glutInitWindowPosition(0, 0);
		glutCreateWindow("simple OpenGL exxample");
		glutDisplayFunc(display);
		myinit();
		glutMainLoop();
	}