#ifdef _WIN32
#include <windows.h>
#endif
#include <GL/glut.h> // glut.h already includes GL/gl.h and GL/glu.h
#include <stdlib.h>
#include <stdio.h>

/* you may need to locate glut.h on your computer and change the path accordingly.
 * It is most likely in ~/include or ~include/GL.
 */

/* the viewport is 500x500 with the origin at (0,0) */
int Vx_min=0, Vx_max=500, Vy_min=0, Vy_max=500, Vz_min=0, Vz_max=0;

int frame_width, frame_height;


void init(void) 
{
   glClearColor (0.0, 0.0, 0.0, 0.0);
}

void display(void)
{
	glClear (GL_COLOR_BUFFER_BIT);   

	/* green */
	glColor3f(0.0,1.0,0.0); /* params are floats in range [0.0,1.0] */

	/* draws one or more lines */
	glBegin(GL_LINES);
		/* params are floats */
		glVertex2f(-150.0, -150.0); /* 2d floats (z=0) */
		glVertex2f( 150.0, -150.0);

		/* params are integers */
		glVertex2i(150, -150); 
		glVertex2i(150, 150);
	
		/* params are doubles */
		glVertex2d(150.0, 150.0); 
		glVertex2d(-150.0, 150.0);
	
		/* params are floats */
		glVertex2f(-150.0, 150.0);
		glVertex2f(-150.0, -150.0);
	glEnd();

	/* blue */
	glColor3ub(0,0,255); /* params are unsigned bytes in range [0,255] */

	/* draws one polygon */
	glBegin(GL_POLYGON);
		glVertex2i(-125, -125);
		glVertex2i(125, -125);
		glVertex2i(125, 125);
		glVertex2i(-125, 125);
	glEnd();


	/* black */
	glColor3f(0.0,0.0,0.0); /* params are floats in range [0.0,1.0] */

	/* draws one or more triangles */
	glBegin(GL_TRIANGLES);
		glVertex2i(-100, -100);
		glVertex2i(100, -100);
		glVertex2i(0, 100);

	glEnd();		
	glColor3f(1.0,0.0,0.0);
	glBegin(GL_TRIANGLES);
		glVertex2i(-100, -100);
		glVertex2i(-100, 100);
		glVertex2i(100, 0);
	glEnd();		

	glFlush ();
}

void reshape (int w, int h)
{
   frame_width = w;
   frame_height = h;
   
   glViewport (0, 0, (GLsizei) w, (GLsizei) h); 
   glMatrixMode (GL_PROJECTION);
   glLoadIdentity ();

//   gluOrtho2D(Vx_min, Vx_max, Vy_min, Vy_max); // 2d
   glFrustum (-1.0, 1.0, -1.0, 1.0, 1.5, 500.0); // 3d

   glMatrixMode (GL_MODELVIEW);
   glLoadIdentity(); // 3d
   gluLookAt (0.0, 0.0, 375.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0); // 3d


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

   switch (button) {
      case GLUT_LEFT_BUTTON:
		  if (state == GLUT_DOWN) {
			printf("left mouse click\n");
			glutPostRedisplay();
		  }
         break;
      default:
         break;
   }
}

int main(int argc, char** argv)
{
   glutInit(&argc, argv);
   glutInitDisplayMode (GLUT_SINGLE | GLUT_RGB);
   glutInitWindowSize (Vx_max-Vx_min, Vy_max-Vy_min); 
   glutInitWindowPosition (100, 100);
   glutCreateWindow (argv[0]);
   
   init ();

   glutDisplayFunc(display); 
   glutReshapeFunc(reshape);
   glutMouseFunc(mouse);
   glutMainLoop();
   return EXIT_SUCCESS;
}