/*
 *  simple.c
 *  This program demonstrates the use of primitives in openGL.
 */

#include <GLUT/glut.h>

/*
* display: display function called when main loop is entered and
* when window is marked for redisplay
*/

void display()
{
	/* clear the window */
	glClearColor(0.0, 0.0, 0.0, 0.0);
	glClear(GL_COLOR_BUFFER_BIT);

	/* draw some shapes */

	/* red triangle */
	glColor3f(1.0, 0.0, 0.0);
	//glPolygonMode(GL_FRONT, GL_LINE);
	glBegin(GL_POLYGON);
		//glColor3f(1.0, 0.0, 0.0);
		glVertex2i(0, 0);
		//glColor3f(0.0, 1.0, 0.0);
		glVertex2i(100, 0);
		//glColor3f(0.0, 0.0, 1.0);
		glVertex2i(100, 100);
	glEnd();

	/* green lines */

	glColor3f(0.0, 1.0, 0.0);
	//glPointSize(10.0);
	glBegin(GL_POINTS);
		glVertex2i(250, 250);
		glVertex2i(300, 250);
		glVertex2i(250, 300);
		glVertex2i(300, 300);
	glEnd();

	/* blue polyline */

	glColor3f(0.0, 0.0, 1.0);
	//glLineWidth(10.0);
	glBegin(GL_LINE_LOOP);
		glVertex2i(250, 400);
		glVertex2i(300, 400);
		glVertex2i(250, 450);
		glVertex2i(300, 450);
	glEnd();

	/* white text */

	glColor3f(1.0, 1.0, 1.0);

	glRasterPos2i(350, 50);
	glutBitmapCharacter(GLUT_BITMAP_TIMES_ROMAN_24, 'H');
	glutBitmapCharacter(GLUT_BITMAP_TIMES_ROMAN_24, 'e');
	glutBitmapCharacter(GLUT_BITMAP_TIMES_ROMAN_24, 'l');
	glutBitmapCharacter(GLUT_BITMAP_TIMES_ROMAN_24, 'l');
	glutBitmapCharacter(GLUT_BITMAP_TIMES_ROMAN_24, 'o');
    
	glRasterPos2i(350, 20);
	glutBitmapCharacter(GLUT_BITMAP_TIMES_ROMAN_24, 'W');
	glutBitmapCharacter(GLUT_BITMAP_TIMES_ROMAN_24, 'o');
	glutBitmapCharacter(GLUT_BITMAP_TIMES_ROMAN_24, 'r');
	glutBitmapCharacter(GLUT_BITMAP_TIMES_ROMAN_24, 'l');
	glutBitmapCharacter(GLUT_BITMAP_TIMES_ROMAN_24, 'd');
	glutBitmapCharacter(GLUT_BITMAP_TIMES_ROMAN_24, '!');

/*
	glutStrokeCharacter(GLUT_STROKE_ROMAN, 'H');
	glutStrokeCharacter(GLUT_STROKE_ROMAN, 'e');
	glutStrokeCharacter(GLUT_STROKE_ROMAN, 'l');
	glutStrokeCharacter(GLUT_STROKE_ROMAN, 'l');
	glutStrokeCharacter(GLUT_STROKE_ROMAN, 'o');
*/

	/* show the output */
	glFlush();
}


int main(int argc, char **argv)
{
	/* create window, set coordinate space */
	glutInit(&argc, argv);
	glutInitDisplayMode(GLUT_RGBA | GLUT_SINGLE);
	glutInitWindowSize(500,500);
	glutInitWindowPosition(0,0);
	glutCreateWindow("Shapes");
	gluOrtho2D(0,500,0,500);
        
	/* set the display function */
	glutDisplayFunc(display);

	/* enter the main loop */
	glutMainLoop();
	
	return 0;
}