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92 lines
2.3 KiB
92 lines
2.3 KiB
import 'package:flame_forge2d/flame_forge2d.dart';
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import 'package:flutter/material.dart';
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/// {@template layered}
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/// Modifies maskBits and categoryBits of all the [BodyComponent]'s [Fixture]s
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/// to specify what other [BodyComponent]s it can collide with.
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///
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/// [BodyComponent]s with compatible [Layer]s can collide with each other,
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/// ignoring others. This compatibility depends on bit masking operation
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/// between layers. For more information read: https://en.wikipedia.org/wiki/Mask_(computing).
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/// {@endtemplate}
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mixin Layered<T extends Forge2DGame> on BodyComponent<T> {
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Layer _layer = Layer.all;
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/// {@macro layered}
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Layer get layer => _layer;
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set layer(Layer value) {
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_layer = value;
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if (!isLoaded) {
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// TODO(alestiago): Use loaded.whenComplete once provided.
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mounted.whenComplete(_applyMaskBits);
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} else {
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_applyMaskBits();
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}
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}
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void _applyMaskBits() {
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for (final fixture in body.fixtures) {
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fixture
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..filterData.categoryBits = layer.maskBits
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..filterData.maskBits = layer.maskBits;
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}
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}
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}
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/// The [Layer]s a [BodyComponent] can be in.
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///
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/// Each [Layer] is associated with a maskBits value to define possible
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/// collisions within that plane.
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///
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/// Usually used with [Layered].
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enum Layer {
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/// Collide with all elements.
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all,
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/// Collide only with board elements (the ground level).
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board,
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/// Collide only with ramps opening elements.
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opening,
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/// Collide only with Jetpack group elements.
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jetpack,
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/// Collide only with Launcher group elements.
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launcher,
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/// Collide only with Spaceship group elements.
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spaceship,
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}
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/// {@template layer_mask_bits}
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/// Specifies the maskBits of each [Layer].
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///
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/// Used by [Layered] to specify what other [BodyComponent]s it can collide
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///
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/// Note: the maximum value for maskBits is 2^16.
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/// {@endtemplate}
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@visibleForTesting
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extension LayerMaskBits on Layer {
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/// {@macro layer_mask_bits}
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@visibleForTesting
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int get maskBits {
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// TODO(ruialonso): test bit groups once final design is implemented.
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switch (this) {
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case Layer.all:
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return 0xFFFF;
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case Layer.board:
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return 0x0001;
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case Layer.opening:
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return 0x0007;
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case Layer.jetpack:
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return 0x0002;
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case Layer.launcher:
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return 0x0005;
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case Layer.spaceship:
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return 0x000A;
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}
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}
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}
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