Adding the Actors - Learning LibGDX Game Development - page 206

After that, add the following code to the same class:
// Rectangles for collision detection
private Rectangle r1 = new Rectangle();
private Rectangle r2 = new Rectangle();
private void onCollisionBunnyHeadWithRock(Rock rock) {};
private void onCollisionBunnyWithGoldCoin(GoldCoin goldcoin) {};
private void onCollisionBunnyWithFeather(Feather feather) {};
private void testCollisions () {
r1.set(level.bunnyHead.position.x, level.bunnyHead.position.y,
level.bunnyHead.bounds.width, level.bunnyHead.bounds.height);
// Test collision: Bunny Head <-> Rocks
for (Rock rock : level.rocks) {
r2.set(rock.position.x, rock.position.y, rock.bounds.width,
rock.bounds.height);
if (!r1.overlaps(r2)) continue;
onCollisionBunnyHeadWithRock(rock);
// IMPORTANT: must do all collisions for valid
// edge testing on rocks.
}
// Test collision: Bunny Head <-> Gold Coins
for (GoldCoin goldcoin : level.goldcoins) {
if (goldcoin.collected) continue;
r2.set(goldcoin.position.x, goldcoin.position.y,
goldcoin.bounds.width, goldcoin.bounds.height);
if (!r1.overlaps(r2)) continue;
onCollisionBunnyWithGoldCoin(goldcoin);
break;
}
// Test collision: Bunny Head <-> Feathers
for (Feather feather : level.feathers) {
if (feather.collected) continue;
r2.set(feather.position.x, feather.position.y,
feather.bounds.width, feather.bounds.height);
if (!r1.overlaps(r2)) continue;
onCollisionBunnyWithFeather(feather);
break;
}
}