/* ************************************************************************** */
/*                                                                            */
/*                                                        ::::::::            */
/*   render_line.c                                      :+:    :+:            */
/*                                                     +:+                    */
/*   By: whaffman <whaffman@student.codam.nl>         +#+                     */
/*                                                   +#+                      */
/*   Created: 2025/04/17 20:06:40 by qmennen       #+#    #+#                 */
/*   Updated: 2025/05/07 11:36:57 by whaffman      ########   odam.nl         */
/*                                                                            */
/* ************************************************************************** */

#include "render.h"

static void	line_low(t_screen *screen,
	t_vec2 start, t_vec2 end, unsigned int color)
{
	int			delta;
	int			yi;
	t_vec2		cur;
	t_vec2		delta_point;

	delta_point.x = end.x - start.x;
	delta_point.y = abs((int) end.y - (int) start.y);
	yi = 1;
	if (end.y - start.y < 0)
		yi = -1;
	delta = 2 * delta_point.y - delta_point.x;
	cur = start;
	while (cur.x <= end.x)
	{
		if (render_check_bounds(screen, &cur))
			mlx_put_pixel(screen->minimap, (int)cur.x, (int)cur.y, color);
		if (delta > 0)
		{
			cur.y += yi;
			delta -= 2 * delta_point.x;
		}
		delta += 2 * delta_point.y;
		cur.x++;
	}
}

static void	line_high(t_screen *screen,
	t_vec2 start, t_vec2 end, unsigned int color)
{
	int			delta;
	int			xi;
	t_vec2		cur;
	t_vec2		delta_point;

	delta_point.x = abs((int) end.x - (int) 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;
	cur = start;
	while (cur.y <= end.y)
	{
		if (render_check_bounds(screen, &cur))
			mlx_put_pixel(screen->minimap, (int)cur.x, (int)cur.y, color);
		if (delta > 0)
		{
			cur.x += xi;
			delta -= 2 * delta_point.y;
		}
		delta += 2 * delta_point.x;
		cur.y++;
	}
}

void	render_line(t_screen *screen,
	t_vec2 start, t_vec2 end, unsigned int color)
{
	if ((start.x < 0 || start.x >= (int) screen->img->width
			|| start.y < 0 || start.y >= (int) screen->img->height)
		&& (end.x < 0 || end.x >= (int) screen->img->width
			|| end.y < 0 || end.y >= (int) screen->img->height))
		return ;
	if (abs((int) end.y - (int) start.y) < abs((int) end.x - (int) start.x))
	{
		if (start.x > end.x)
			line_low(screen, end, start, color);
		else
			line_low(screen, start, end, color);
	}
	else
	{
		if (start.y > end.y)
			line_high(screen, end, start, color);
		else
			line_high(screen, start, end, color);
	}
}