#include "IPS_graphics.h"

// Implementation of putpixel. Thanks to code from,
// https://developer.gnome.org/gdk-pixbuf/stable/gdk-pixbuf-The-GdkPixbuf-Structure.html
void put_pixel(GdkPixbuf *pixbuf, int x, int y, guchar red, guchar green, guchar blue, guchar alpha)
	{
	guchar *pixels, *p;
	int rowstride, numchannels;
	numchannels = gdk_pixbuf_get_n_channels(pixbuf);
	rowstride = gdk_pixbuf_get_rowstride(pixbuf);
	pixels = gdk_pixbuf_get_pixels(pixbuf);
	p = pixels + y * rowstride + x * numchannels;
	p[0] = red;	p[1] = green; p[2] = blue; p[3] = alpha;
	}




// Pain a background function to make a pixel buffern and an image to display as default canvas
void paint_a_background (gpointer data)
	{
	GdkPixbuf *p;
	p = gdk_pixbuf_new(GDK_COLORSPACE_RGB, 0, 8, X_SIZE, Y_SIZE);	
	/*Paint a background canvas for start up image*/
  	int x,y;
	for (x = 0; x < X_SIZE; x++)
	      for (y = 0; y < Y_SIZE; y++)
			put_pixel(p, (int)x, (int)y, (guchar)x, (guchar)y, (guchar)x+y, 255);
	gtk_image_set_from_pixbuf(GTK_IMAGE(data), GDK_PIXBUF(p));
	g_object_unref(p);
	}




// Function to paint lattice DATA from the simulation into a pixbuffer
void paint_lattice (gpointer data, IPSmodel *s)
	{
   	GdkPixbuf *p;
	// set the colors for all the states (machine and tape)
	// default colors are defined as macros
	ColorMap colores = 
		{
		// machine states
		VACANT,				// vacancy
		OCCUPIED 			// occupied
		};

	int x,y;
	p = gdk_pixbuf_new(GDK_COLORSPACE_RGB, 0, 8, X_SIZE, Y_SIZE);
	// What do we plot, Machine or Tape state?
	// Paint the lattice MACHINE configuration to a pixbuffer;
	for (x = 0; x < X_SIZE; x++)
			for (y = 0; y < Y_SIZE; y++)
 					 switch (s->lattice_configuration[x][y])
       					 {
       					 case 0: // empty (vacant) site  (white)
          					put_pixel (p, (int) x, (int) y, 
								(guchar) colores.vacant[0], (guchar) colores.vacant[1], (guchar) colores.vacant[2], 255);                                                                                                       
         				 	break;
       					 case 1: // occupied site pointing North
         					put_pixel (p, (int) x, (int) y, 
								(guchar) colores.occupied[0], (guchar) colores.occupied[1], (guchar) colores.occupied[2], 255);                                                                                                            
          					break;
						 }
	gtk_image_set_from_pixbuf(GTK_IMAGE(data), GDK_PIXBUF(p));
	g_object_unref(p);
	}