/*
 * orthoPerspect.cpp
 *
 *  Created on: Feb 13, 2013
 *      Author: Debure, modified from OpenGL Programming Guide (Shreiner)
 */
/* viewing transformations */

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

void init (void){
	glClearColor(0.0, 0.0, 0.0, 0.0);    // default anyway
	glShadeModel(GL_FLAT);
	glMatrixMode(GL_PROJECTION);        // specify which matrices are affected
	glLoadIdentity();                   // start with a new transformation matrix

	// Use an orthographic view
	glOrtho(-2.0, 2.0, -2.0, 2.0, 2.0, 20.0);

	// or use a perspective view
	//glFrustum(-1.0, 1.0, -1.0, 1.0, 1.5, 20.0);

	// or use a GLU implementation of perspective view
	// gluPerspective(60.0, 1.0, 1.5, 20.0);

	glMatrixMode(GL_MODELVIEW);
}

void display() {
	glClear(GL_COLOR_BUFFER_BIT);
    glColor3f(1.0, 1.0, 1.0);

	/* viewing transformation */
	glLoadIdentity();
	gluLookAt(0.0, 0.0, 5.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0);
	                          // first three values are camera pos
	                          // next three are camera direction
	                          // last three are up vector
	//glScalef(1.0, 2.0, 1.0);  // double the size along the Y axis
	glutWireCube(1.0);

	glFlush();
}

int main(int argc, char **argv) {
	glutInit(&argc, argv);
	glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);
	glutInitWindowSize(500, 500);
	glutCreateWindow("Viewing Transforms");
    init();
	glutDisplayFunc(display);

	glutMainLoop();
	return 0;
}