#include <GL/glut.h>

void myInit( void )
{
	//attributes
	glClearColor( 1.0 , 1.0 , 1.0 , 0.0 );
	glColor3f( 0.0 , 0.0 , 0.0 );
	glPointSize(4.0);

	//viewing
	glMatrixMode(GL_PROJECTION);
	glLoadIdentity();
	gluOrtho2D( 0.0 , 300 , 0.0 , 300 );
	glMatrixMode(GL_MODELVIEW);
}

void display ()
{
	glClear(GL_COLOR_BUFFER_BIT);

	/*
	//
	// #1
	//
	// put a red point 20 pixels to the right and 20 pixels up from the bottom left corner
	// put a blue point 20 pixels to the right and 20 pixels down from the top left corner
	glBegin(GL_POINTS);

	glEnd();
	*/


	/*
	//
	// #2
	//
	// put a line from the upper left corner to the lower right corner
	// if you don't change anything, what color is it?
	glBegin(GL_LINES);
	
	glEnd();
	*/


	/*
	//
	// #3
	//
	//create a "U" using a LINE_STRIP  
	glBegin(GL_LINE_STRIP);

	glEnd();
	*/

	/*
	//
	// #4
	//
	// create a polygon using the same vertices you used in #3
	glBegin(GL_POLYGON);

	glEnd();
	*/

	/*
	//
	// #5
	//
	// use the same vertices as in #4, but switch the order of your second and third vertices
	glBegin(GL_POLYGON);

	glEnd();
	*/

	/*
	//
	// #6
	//
	// use the same vertices, in the same order as #5, but try compiling with each of 
	// the following polygon mode settings uncommented once
	//glPolygonMode( GL_FRONT_AND_BACK , GL_POINT );
	//glPolygonMode( GL_FRONT_AND_BACK , GL_LINE );
	//glPolygonMode( GL_FRONT_AND_BACK , GL_FILL );
	glBegin(GL_POLYGON);

	glEnd();
	*/

	/*
	//
	// #7
	//
	// create a simple, but non-convex polygon, and try compiling with each of  
	// the following polygon mode settings uncommented once
	//glPolygonMode( GL_FRONT_AND_BACK , GL_POINT );
	//glPolygonMode( GL_FRONT_AND_BACK , GL_LINE );
	//glPolygonMode( GL_FRONT_AND_BACK , GL_FILL );
	glBegin(GL_POLYGON);

	glEnd();
	*/

	glFlush();
}

void main( int argc, char ** argv ) 
{
	glutInit(&argc,argv);
	glutInitDisplayMode( GLUT_SINGLE | GLUT_RGB );
	glutInitWindowSize( 300 , 300 );
	glutInitWindowPosition( 100 , 100 );
	glutCreateWindow(" Lab ");
	glutDisplayFunc(display);
	myInit();
	glutMainLoop();
}