/*
 * stopGo.cpp
 *
 *  Created on: Mar 1, 2013
 *      Author: debure
 */

#include <GL/glut.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include <iostream>
using namespace std;

#define DTOR 3.14159/180.0
float theta;

void myinit(void) {

  glClearColor(1.0, 1.0, 1.0, 1.0);
  glColor3f(0.0, 0.0, 0.0);

  glMatrixMode(GL_PROJECTION);
  glLoadIdentity();
  gluOrtho2D(0.0, 500.0, 500.0, 0.0);
  glMatrixMode(GL_MODELVIEW);
  glEnableClientState(GL_VERTEX_ARRAY);
}

void display(void) {

  // square is created at the origin
  GLfloat sq_vertices[4][2] = {{-1.0,-1.0},{1.0,-1.0},{1.0, 1.0},{-1.0,1.0}};
  GLubyte sqIndices[4]={0,3,2,1};
  GLfloat colors[8][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}};


  glClear(GL_COLOR_BUFFER_BIT);

  // code for rotating square
  glVertexPointer(2, GL_FLOAT, 0, sq_vertices);
  glColorPointer(3, GL_FLOAT, 0, colors);
  glEnableClientState(GL_COLOR_ARRAY);
  glPushMatrix();
  glLoadIdentity();
  glTranslatef(250.0, 250.0, 0.0);
  glScalef(45.0, 45.0, 0.0);
  glRotatef(theta*DTOR, 0.0, 0.0, 1.0);
  glDrawElements(GL_QUADS, 4, GL_UNSIGNED_BYTE, sqIndices);
  glPopMatrix();

  glDisableClientState(GL_COLOR_ARRAY); // stop
  glColor3f(1.0, 0, 0);
  glPushMatrix();
  glLoadIdentity();
  glTranslatef(75.0, 75.0, 0.0);
  glScalef(25.0, 25.0, 0.0);
  glDrawElements(GL_QUADS, 4, GL_UNSIGNED_BYTE, sqIndices);
  glPopMatrix();

  glColor3f(0, 1.0, 0); // go
  glPushMatrix();
  glLoadIdentity();
  glTranslatef(135.0, 75.0, 0.0);
  glScalef(25.0, 25.0, 0.0);
  glDrawElements(GL_QUADS, 4, GL_UNSIGNED_BYTE, sqIndices);
  glPopMatrix();

  glutSwapBuffers();
  glFlush();
}

void idle(void){
  theta += 10;            // modify rotation angle that is used in display
  glutPostRedisplay();
}

void mouse(int button, int state, int x, int y){

   if (button==GLUT_LEFT_BUTTON && state==GLUT_DOWN &&
	   x >= 50 && x <= 100 && y >= 50 && y <= 100)  // check if inside red sq
	   glutIdleFunc(NULL);
   if (button==GLUT_LEFT_BUTTON && state==GLUT_DOWN &&
	   x >= 110 && x <=160 && y >= 50 && y <= 100)  // check if inside green sq
	   glutIdleFunc(idle);
   if (button==GLUT_RIGHT_BUTTON && state==GLUT_DOWN)
	   exit(0);
}

int main(int argc, char** argv) {

  glutInit(&argc, argv);
  glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB );
  glutInitWindowSize(500, 500);
  glutInitWindowPosition(0,0);
  glutCreateWindow("Graphics Primitives");
  glutDisplayFunc(display);
  glutMouseFunc(mouse);
  glutIdleFunc(idle);

  myinit();
  glutMainLoop();
  return 0;
}