draw_line.c

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/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   draw_line.c                                        :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: tgrekov <tgrekov@student.hive.fi>          +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2024/06/13 06:17:39 by tgrekov           #+#    #+#             */
/*   Updated: 2024/06/24 06:00:19 by tgrekov          ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */
 
#include <MLX42.h>
#include "../utils/utils.h"
 
void    draw_line(mlx_image_t *img, int x1, int y1, int *p2)
{
    int dx;
    int dy;
    int err;
    int dir[2];
 
    dx = abs(p2[0] - x1);
    dy = -abs(p2[1] - y1);
    err = dx + dy;
    dir[0] = (x1 < p2[0]) * 2 - 1;
    dir[1] = (y1 < p2[1]) * 2 - 1;
    while (!(err * 2 >= dy && x1 == p2[0]) && !(err * 2 <= dx && y1 == p2[1]))
    {
        mlx_put_pixel(img, x1, y1, 0xFF0000FF);
        if (err * 2 >= dy)
        {
            err += dy;
            x1 += dir[0];
        }
        if (err * 2 <= dx)
        {
            err += dx;
            y1 += dir[1];
        }
    }
}