#include "dim.h"

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



int fb[BUFFWIDTH][BUFFHEIGHT];  		/* the simulated frame buffer*/
int width=500,height=500;  			/*  initial window size  */
float pixwidth = (float) width/BUFFWIDTH;  	/* simulated pixel width */
float pixheight = (float) height/BUFFHEIGHT;  	/* simulated pixel height */
enum mode {Fill, NoFill};  			/* possible modes of program */
mode currmode=Fill; 				/* initially Fill mode*/
// int vptx0, vptx1, vpty0, vpty1;		/* uncomment for viewport

void init()
{
  glClearColor(0.0,0.0,0.0,0.0);  /* clear color is black  */
  for (int i=0; i<BUFFWIDTH; i++)  /* initially simulated pixels are black */
    for (int j=0; j<BUFFHEIGHT; j++)
	fb[i][j]=0;

  // this code is for viewport
  //  printf("Enter the coordinates of the lower left and upper right corners of the viewport. (x range: 0-%d, y:range 0-%d.)\n", BUFFWIDTH-1, BUFFHEIGHT-1);
  

}

void display()
{
  glClear(GL_COLOR_BUFFER_BIT);  /* clear the screen */

  // this code is for viewport
  // glColor3f(1.0,0.0,0.0);  /* viewport is red */
  // glRectf((float) vptx0*pixwidth, (float) vpty0*pixheight, (float) (vptx1+1)*pixwidth, (float) (vpty1+1)*pixheight);

  /*  draw white pixels */

  glColor3f(1.0,1.0,1.0);  /*  drawing color is white */
  for (int i=0;i<BUFFWIDTH;i++)  /* draw the "on"  pixels */
    for (int j=0;j<BUFFHEIGHT;j++)
      if (fb[i][j]==1) 			
	glRectf(i*pixwidth, j* pixheight,(i+1)*pixwidth, (j+1)*pixheight);

  /*  draw green pixels */

  glColor3f(0.0,1.0,0.0);  /*  drawing color is green */
  for (int i=0;i<BUFFWIDTH;i++)  /* draw the "on"  pixels */
    for (int j=0;j<BUFFHEIGHT;j++)
      if (fb[i][j]==3) 			
	glRectf(i*pixwidth, j* pixheight,(i+1)*pixwidth, (j+1)*pixheight);

  /*  draw blue pixels */

  glColor3f(0.0,0.0,1.0);  /*  drawing color is blue */
  for (int i=0;i<BUFFWIDTH;i++)  /* draw the "on"  pixels */
    for (int j=0;j<BUFFHEIGHT;j++)
      if (fb[i][j]==2) 			
	glRectf(i*pixwidth, j* pixheight,(i+1)*pixwidth, (j+1)*pixheight);


  glutSwapBuffers();

}

void reshape(int w, int h)
{
  width = w;
  height = h;
  pixwidth =(float) w/BUFFWIDTH;
  pixheight = (float) h/BUFFHEIGHT;
  glViewport(0,0,w,h);
  glMatrixMode(GL_PROJECTION);
  glLoadIdentity();
  glOrtho(0,w,0,h,-1,1);
  glMatrixMode(GL_MODELVIEW);
  glLoadIdentity();
}

void keyboard(unsigned char key, int x, int y)
{
  switch (key) {

  case 'C':  /* clear the simulated frame buffer */
  case 'c': 
    for (int i=0;i<BUFFWIDTH;i++)
      for(int j=0;j<BUFFHEIGHT;j++)
	fb[i][j]=0;
    glutPostRedisplay();
    break;

  case 'F':  /* toggle fill-mode */
  case 'f': 
    if (currmode==NoFill) {
	glutSetWindowTitle("Fill Mode, Options:  C=Clear, D=Draw, F=No Fill");
	currmode = Fill;
	}

    else {
	glutSetWindowTitle("No Fill Mode, Options C=Clear, D=Draw, F=Fill");
	currmode = NoFill;
	}
    glutPostRedisplay();
    break;

  case 'd':
  case 'D':
        // insert your code here.
    glutPostRedisplay();
    break;

  
  }
}

void mouse(int button, int state, int x, int y)
{
  if (state == GLUT_DOWN) {
     {  /* toggle chosen pixel */
       int x0 =  x/pixwidth;
       int y0 =  BUFFHEIGHT - y/pixheight; 
       // the user has chosen pixel x0, y0
       //  what do you want to do about it?
       fb[x0][y0]=3;

       glutPostRedisplay();
     }
  }
}





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

  /* set up window */
  glutInit(&argc, argv);
  glutInitDisplayMode(GLUT_DOUBLE |  GLUT_RGB);
  glutInitWindowSize(width,height);
  glutInitWindowPosition(100,100);
  glutCreateWindow("Fill Mode, Options:  C=Clear, D=Draw, F=No Fill");

  init();  /* initialize program parameters */

  /* register callback functions */
  glutDisplayFunc(display);  
  glutReshapeFunc(reshape);
  glutKeyboardFunc(keyboard);
  glutMouseFunc(mouse);


  glutMainLoop(); /* loop until something happens */


  return 1;
}