/* ************************************************************************** */
/*                                                                            */
/*  ML_line.c                                                                 */
/*  | Project : libmonochrome                                                 */
/*                                                                            */
/*  By: Pierre "PierrotLL" Le Gall <legallpierre89@gmail.com>                 */
/*  Last updated: 2011/11/22                                                  */
/*                                                                            */
/* ************************************************************************** */

#include <monochrome/internals.h>

void ML_line(int x1, int y1, int x2, int y2, ML_Color color)
{
	int i, x, y, dx, dy, sx, sy, cumul;
	x = x1;
	y = y1;
	dx = x2 - x1;
	dy = y2 - y1;
	sx = sgn(dx);
	sy = sgn(dy);
	dx = abs(dx);
	dy = abs(dy);
	ML_pixel(x, y, color);
	if(dx > dy)
	{
		cumul = dx / 2;
		for(i=1 ; i<dx ; i++)
		{
			x += sx;
			cumul += dy;
			if(cumul > dx)
			{
				cumul -= dx;
				y += sy;
			}
			ML_pixel(x, y, color);
		}
	}
	else
	{
		cumul = dy / 2;
		for(i=1 ; i<dy ; i++)
		{
			y += sy;
			cumul += dx;
			if(cumul > dy)
			{
				cumul -= dy;
				x += sx;
			}
			ML_pixel(x, y, color);
		}
	}
}