/* ************************************************************************** */
/*                                                                            */
/*                                                  :::  o_   ::::::    :::   */
/*   fdf_draw.c                                    :+:  /    :+::+:    :+:    */
/*                                                +:+   >   +:++:+    +:+     */
/*   By: whaffman <whaffman@student.codam.nl>    +#+  +:+  +#++#++:++#++      */
/*                                              +#+ +#+#+ +#++#+    +#+ \o/   */
/*   Created: 2024/12/08 11:45:12 by whaffman   #+#+# #+#+# #+#    #+#   |    */
/*   Updated: 2024/12/13 15:23:12 by whaffman   ###   ###  ###    ###   / \   */
/*                                                                            */
/* ************************************************************************** */
#include "fdf.h"

bool	fdf_put_pixel(t_fdf *fdf, t_point_2d point)
{
	int		color;

	color = 0xFFFFFFFF;
	if (point.x < 0 || point.x >= (int) fdf->img->width
		|| point.y < 0 || point.y >= (int) fdf->img->height)
		return (false);
	if (fdf->colormode == COLOR_MODE_DEFAULT)
		color = point.color;
	else if (fdf->colormode == COLOR_MODE_Z)
		color = get_z_color(point.orig_z, fdf->map->z_max);
	else if (fdf->colormode == COLOR_MODE_GRADIENT)
		color = get_gradient_color(point.orig_z, fdf->map->z_max);
	mlx_put_pixel(fdf->img, point.x, point.y, color);
	return (true);
}

void	fdf_draw_line_low(t_fdf *fdf, t_point_2d start, t_point_2d end)
{
	int			delta;
	int			yi;
	t_point_2d	current;
	t_point_2d	delta_point;

	delta_point.x = end.x - start.x;
	delta_point.y = abs(end.y - start.y);
	yi = 1;
	if (end.y - start.y < 0)
		yi = -1;
	delta = 2 * delta_point.y - delta_point.x;
	current = start;
	while (current.x <= end.x)
	{
		current.color = interpolate_color(start, end, current);
		fdf_put_pixel(fdf, current);
		if (delta > 0)
		{
			current.y += yi;
			delta -= 2 * delta_point.x;
		}
		delta += 2 * delta_point.y;
		current.x++;
	}
}

void	fdf_draw_line_high(t_fdf *fdf, t_point_2d start, t_point_2d end)
{
	int			delta;
	int			xi;
	t_point_2d	current;
	t_point_2d	delta_point;

	delta_point.x = abs(end.x - start.x);
	delta_point.y = end.y - start.y;
	xi = 1;
	if (end.x - start.x < 0)
		xi = -1;
	delta = 2 * delta_point.x - delta_point.y;
	current = start;
	while (current.y <= end.y)
	{
		current.color = interpolate_color(start, end, current);
		fdf_put_pixel(fdf, current);
		if (delta > 0)
		{
			current.x += xi;
			delta -= 2 * delta_point.y;
		}
		delta += 2 * delta_point.x;
		current.y++;
	}
}

void	fdf_draw_line(t_fdf *fdf, t_point_2d start, t_point_2d end)
{
	if ((start.x < 0 || start.x >= (int) fdf->img->width
			|| start.y < 0 || start.y >= (int) fdf->img->height)
		&& (end.x < 0 || end.x >= (int) fdf->img->width
			|| end.y < 0 || end.y >= (int) fdf->img->height))
		return ;
	if (abs(end.y - start.y) < abs(end.x - start.x))
	{
		if (start.x > end.x)
			fdf_draw_line_low(fdf, end, start);
		else
			fdf_draw_line_low(fdf, start, end);
	}
	else
	{
		if (start.y > end.y)
			fdf_draw_line_high(fdf, end, start);
		else
			fdf_draw_line_high(fdf, start, end);
	}
}