/********************************************************************

  Transform_demo - based upon Angel's cube.c program
  Edited by H. Masterman to illustrate different aspects of
  transformations

  rev. 0 9 October 2000
  rev. 1 Updated 26 February 2001 to clean up unnecessary code
  rev. 2 Updated 27 February 2002 to simplify
  rev. 3 Updated 22 February 2007 to simplify/correct errors

  ********************************************************************/

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

        GLfloat vertices[][3] = {{-1.0,-1.0,-1.0},{1.0,-1.0,-1.0},
        {1.0,1.0,-1.0}, {-1.0,1.0,-1.0}, {-1.0,-1.0,1.0}, 
        {1.0,-1.0,1.0}, {1.0,1.0,1.0}, {-1.0,1.0,1.0}};

        
        GLfloat colors[][3] = {{0.0,0.0,0.0},{1.0,0.0,0.0},
        {1.0,1.0,0.0}, {0.0,1.0,0.0}, {0.0,0.0,1.0}, 
        {1.0,0.0,1.0}, {1.0,1.0,1.0}, {0.0,1.0,1.0}};

void polygon(int a, int b, int c , int d)
{

/* draw a polygon via list of vertices */

        glBegin(GL_POLYGON);
                glColor3fv(colors[a]);
                glVertex3fv(vertices[a]);
                glColor3fv(colors[b]);
                glVertex3fv(vertices[b]);
                glColor3fv(colors[c]);
                glVertex3fv(vertices[c]);
                glColor3fv(colors[d]);
                glVertex3fv(vertices[d]);
        glEnd();
}

void colorcube(void)
{

/* map vertices to faces */

        polygon(0,3,2,1);
        polygon(2,3,7,6);
        polygon(0,4,7,3);
        polygon(1,2,6,5);
        polygon(4,5,6,7);
        polygon(0,1,5,4);
}



void display(void)
{
cout<<"in display"<<endl;
 glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); //clear color buffer and z buffer
 
 glLoadIdentity();  // start with an identity in the MODELVIEW transformation
//glTranslatef(0,0,-6);
 //gluLookAt(0,0,6,0,0,0,0,1,0);
 //Introduce transforms here before drawing the cube
   //glScalef (.5, 1, 1);
   //glTranslatef(2,0,0);
   //glRotatef(45, 0,1,0);




 
 //glScalef (1,0.5,1);

 colorcube(); // draw the color cube

 glFlush();

}
 


void mouse(int btn, int state, int x, int y)
{
exit(0);
//exit the program on any mouse click
}

void myReshape(int w, int h)
{
    cout<<"in reshape"<<endl;
        glViewport(0, 0, w, h);
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
	//gluPerspective(60, 1.0, 4, 10);
	//glFrustum(-1,1,-1,1,2,10);
   glOrtho(-4,4,-4,4,-4,4);  //establishes orthog. proj with view volume

        glMatrixMode(GL_MODELVIEW);
        
}

void
main(int argc, char **argv)
{
    glutInit(&argc, argv);
	glutInitDisplayMode(GLUT_RGB |GLUT_DEPTH);  // allocate a color and depth buffer
    glutInitWindowSize(700, 700);  // size the window
    glutCreateWindow("My Transform Example");  //create the window
    glutReshapeFunc(myReshape);  //register the reshape callback function
    glutDisplayFunc(display);  //register the display callback function
    glEnable(GL_DEPTH_TEST); // Enable hidden--surface--removal 
    glutMainLoop();
}