54 lines
1.5 KiB
Rust
54 lines
1.5 KiB
Rust
//! Basic physics utilities for cat-box.
|
|
//!
|
|
//! Still ***very much work-in-progress***
|
|
|
|
#![allow(clippy::cast_possible_wrap)]
|
|
|
|
use crate::{Sprite, SpriteCollection};
|
|
use std::cmp::max;
|
|
|
|
// https://github.com/pythonarcade/arcade/blob/d2ce45a9b965020cde57a2a88536311e04504e6e/arcade/sprite_list/spatial_hash.py#L356
|
|
|
|
fn collided(sprite1: &Sprite, sprite2: &Sprite) -> bool {
|
|
let coll_rad1 = max(sprite1.rect.width(), sprite1.rect.height()) as i32;
|
|
let coll_rad2 = max(sprite2.rect.width(), sprite2.rect.height()) as i32;
|
|
|
|
let collision_radius = coll_rad1 + coll_rad2;
|
|
let collision_diameter = collision_radius * collision_radius;
|
|
|
|
let diff_x = sprite1.position().x - sprite2.position().x;
|
|
let diff_x2 = diff_x * diff_x;
|
|
|
|
if diff_x2 > collision_diameter {
|
|
return false;
|
|
}
|
|
|
|
let diff_y = sprite1.position().y - sprite2.position().y;
|
|
let diff_y2 = diff_y * diff_y;
|
|
|
|
if diff_y2 > collision_diameter {
|
|
return false;
|
|
}
|
|
|
|
sprite1.rect.has_intersection(sprite2.rect)
|
|
}
|
|
|
|
/// Check if two sprites are touching or overlapping.
|
|
#[must_use]
|
|
pub fn check_for_collision(sprite1: &Sprite, sprite2: &Sprite) -> bool {
|
|
collided(sprite1, sprite2)
|
|
}
|
|
|
|
/// Check if the sprite is colliding with any sprite in the collection, and return a list of
|
|
/// references to the sprites which are colliding
|
|
#[must_use]
|
|
pub fn check_for_collision_with_collection<'a>(
|
|
sprite: &Sprite,
|
|
list: &'a SpriteCollection,
|
|
) -> Vec<&'a Sprite> {
|
|
list.inner()
|
|
.iter()
|
|
.filter(|s| check_for_collision(sprite, s))
|
|
.collect()
|
|
}
|