/* -*- C++ -*-
 * Copyright ©2004 Hugo Mills <hugo@carfax.org.uk>
 *
 * This software is distributed under the terms of the GNU GPL v3
 * For more information on the GPL, see the file COPYING or 
 * visit http://www.gnu.org/
 *
 * This software is distributed without warranty
 */

#include "display_pixmap.h"

#include <algorithm>

void Display_Pixmap::plot(void)
{
	ivec bm_pos(2);
	dvec map_pos(2);
	dvec shifted_pos(3);
	dvec globe_pos(3);
	dvec latlong(2);

	ivec colour(3);

	for(bm_pos[1] = viewport->bottom(); 
		bm_pos[1] < viewport->top(); 
		bm_pos[1]++)
	{
		for(bm_pos[0] = viewport->left(); 
			bm_pos[0] < viewport->right(); 
			bm_pos[0]++)
		{
			if(!viewport->g(map_pos, bm_pos))
				continue;

			if(projection->g(shifted_pos, map_pos)
			   && orbit->g(globe_pos, shifted_pos)
			   && sphere->g(latlong, globe_pos))
			{
				ivec pixelpos(2);
				pixelpos[0] = int((latlong[0]+M_PI)*xconv);
				pixelpos[1] = int((latlong[1]+M_PI_2)*yconv);
				if(pixelpos[0] < 0) pixelpos[0] = 0;
				if(pixelpos[1] < 0) pixelpos[1] = 0;
				if(pixelpos[0] >= picture->width())
					pixelpos[0] = picture->width()-1;
				if(pixelpos[1] >= picture->height())
					pixelpos[1] = picture->height()-1;

				colour = picture->getpixel(pixelpos);
			} else {
				colour[0] = colour[1] = colour[2] = 0;
				continue;
			}
			bitmap->setpixel(bm_pos, colour);
		}
	}
}