bevy_pixel_map/
util.rs

1use std::cmp::Ordering;
2
3use bevy::prelude::{IVec2, Vec2};
4
5use crate::{CHUNK_SIZE, TILE_SIZE};
6
7pub fn align_loc_to_chunk(mut loc: i32) -> i32 {
8    match loc.cmp(&0) {
9        Ordering::Greater => loc / CHUNK_SIZE as i32,
10        Ordering::Less => {
11            let mut result = 0;
12            while loc < 0 {
13                loc += CHUNK_SIZE as i32;
14                result -= 1;
15            }
16            result
17        }
18        Ordering::Equal => 0,
19    }
20}
21
22pub fn chunk_from_location(loc: IVec2) -> IVec2 {
23    IVec2::new(align_loc_to_chunk(loc.x), align_loc_to_chunk(loc.y))
24}
25
26pub fn tile_from_location(loc: IVec2) -> IVec2 {
27    let loc_x = loc.x.rem_euclid(CHUNK_SIZE as i32) as usize;
28    let loc_y = loc.y.rem_euclid(CHUNK_SIZE as i32) as usize;
29
30    IVec2::new(loc_x as i32, loc_y as i32)
31}
32
33/// Converts a world coordinate to a tile location
34pub fn world_unit_to_tile(loc: Vec2) -> IVec2 {
35    IVec2::new(
36        (loc.x).ceil() as i32 + CHUNK_SIZE as i32 / 2 - 1,
37        (loc.y).ceil() as i32 + CHUNK_SIZE as i32 / 2 - 1,
38    )
39}
40
41/// Converts a world coordinate to a tile & pixel location
42pub fn world_unit_to_pixel(loc: Vec2) -> (IVec2, IVec2) {
43    let world_loc = world_unit_to_tile(loc);
44
45    let mut leftover_loc = Vec2::new(
46        world_loc.x as f32 - loc.x - 7.0,
47        world_loc.y as f32 - loc.y - 7.0,
48    );
49    leftover_loc.x *= TILE_SIZE as f32;
50    leftover_loc.y *= TILE_SIZE as f32;
51
52    let pixel = IVec2::new(
53        8 - (leftover_loc.x.ceil() as i32),
54        leftover_loc.y.ceil() as i32 - 1,
55    );
56
57    (world_loc, pixel)
58}
bevy_pixel_map/util.rs

bevy_pixel_map/
util.rs
