Collision logic

src/collision.rs

@@ -0,0 +1,43 @@
+use bevy::prelude::*;
+
+use crate::{obstacle::Obstacle, player::Player};
+
+// Hitbox
+#[derive(Component)]
+pub struct Collider {
+    pub size: Vec2,
+}
+
+// Check collision with Player
+fn check_collision(
+    mut player: Single<(&Transform, &Collider, &mut Sprite), With<Player>>,
+    obstacle: Query<(&Transform, &Collider), With<Obstacle>>,
+    mut has_collided: Local<bool>,
+) {
+    if *has_collided {
+        println!("Collision!!!!!!!");
+        return;
+    }
+
+    let (player_transform, player_collider, mut player_sprite) = player.into_inner();
+
+    for (collider_transform, collider_collider) in obstacle {
+        if overlap(
+            player_transform.translation.truncate(),
+            player_collider.size / 2.0,
+            collider_transform.translation.truncate(),
+            collider_collider.size / 2.0,
+        ) {
+            player_sprite.color = Color::srgb(1.0, 0.0, 0.0);
+            *has_collided = true;
+            break;
+        }
+    }
+}
+
+// Test if there is an overlap between 2 boxes
+fn overlap(a_center: Vec2, a_half: Vec2, b_center: Vec2, b_half: Vec2) -> bool {
+    let overlap_x = (a_center.x - b_center.x).abs() < (a_half.x + b_half.x);
+    let overlap_y = (a_center.y - b_center.y).abs() < (a_half.y + b_half.y);
+    overlap_x && overlap_y
+}