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


void display(void)
{
	glClear(GL_COLOR_BUFFER_BIT);	//flush gl
//	glColor3f(1.0, 0.0, 0.0);		//red

	//hexagon
	glBegin(GL_POLYGON);
	        glColor3f(1.0, 0.0, 0.0);		//red
		glVertex2i(40,80);		//left
		glVertex2i(80,120);		//LT
			glColor3f(0.0, 1.0, 0.0);		//green
		glVertex2i(160,120);	//RT
		glVertex2i(200,80);	//Right
		    glColor3f(0.0, 0.0, 1.0);		//blue
		glVertex2i(160,40);		//RB
		glVertex2i(80,40);		//RL
	glEnd();
	
	

	glFlush();	//force immidiate display
}

int main(int argc,char *argv[])
{
	glutInit(&argc,argv);					//prepare glut
	glutInitDisplayMode (GLUT_SINGLE | GLUT_RGB);		//set the display mode
	glutInitWindowSize (500, 500);			//the size of the program window
	glutInitWindowPosition (100, 100);		//initial position for the window
	glutCreateWindow ("points and lines");	//create window with a title
	
	glClearColor(255,255,255,0.0);  		//background color
	glMatrixMode (GL_PROJECTION);			//2d envyronment
	gluOrtho2D (40.0, 200.0, 40.0, 120.0);	//matrix dimensions
	
	glutDisplayFunc(display);				//show thee actual program
	glutMainLoop();
	
	return EXIT_SUCCESS;					//exit the program
}