mirror of https://github.com/flutter/pinball.git
refactor: moved gravity logic to `BallGravitatingBehavior` (#314)
parent
c67db0e55c
commit
01dc3f387a
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import 'dart:math' as math;
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import 'package:flame/components.dart';
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import 'package:flame_forge2d/flame_forge2d.dart';
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import 'package:pinball_components/pinball_components.dart';
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import 'package:pinball_flame/pinball_flame.dart';
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/// Scales the ball's gravity according to its position on the board.
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class BallGravitatingBehavior extends Component
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with ParentIsA<Ball>, HasGameRef<Forge2DGame> {
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@override
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void update(double dt) {
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super.update(dt);
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final defaultGravity = gameRef.world.gravity.y;
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final maxXDeviationFromCenter = BoardDimensions.bounds.width / 2;
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const maxXGravityPercentage =
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(1 - BoardDimensions.perspectiveShrinkFactor) / 2;
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final xDeviationFromCenter = parent.body.position.x;
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final positionalXForce = ((xDeviationFromCenter / maxXDeviationFromCenter) *
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maxXGravityPercentage) *
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defaultGravity;
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final positionalYForce = math.sqrt(
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math.pow(defaultGravity, 2) - math.pow(positionalXForce, 2),
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);
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final gravityOverride = parent.body.gravityOverride;
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if (gravityOverride != null) {
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gravityOverride.setValues(positionalXForce, positionalYForce);
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} else {
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parent.body.gravityOverride = Vector2(positionalXForce, positionalYForce);
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}
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}
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}
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@ -1 +1,2 @@
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export 'ball_gravitating_behavior.dart';
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export 'ball_scaling_behavior.dart';
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export 'ball_scaling_behavior.dart';
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@ -0,0 +1,63 @@
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// ignore_for_file: cascade_invocations
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import 'dart:ui';
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import 'package:flame/components.dart';
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import 'package:flame_test/flame_test.dart';
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import 'package:flutter_test/flutter_test.dart';
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import 'package:pinball_components/pinball_components.dart';
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import 'package:pinball_components/src/components/ball/behaviors/behaviors.dart';
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import '../../../../helpers/helpers.dart';
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void main() {
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TestWidgetsFlutterBinding.ensureInitialized();
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final asset = Assets.images.ball.ball.keyName;
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final flameTester = FlameTester(() => TestGame([asset]));
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group('BallGravitatingBehavior', () {
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const baseColor = Color(0xFFFFFFFF);
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test('can be instantiated', () {
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expect(
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BallGravitatingBehavior(),
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isA<BallGravitatingBehavior>(),
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);
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});
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flameTester.test('can be loaded', (game) async {
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final ball = Ball.test(baseColor: baseColor);
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final behavior = BallGravitatingBehavior();
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await ball.add(behavior);
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await game.ensureAdd(ball);
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expect(
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ball.firstChild<BallGravitatingBehavior>(),
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equals(behavior),
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);
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});
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flameTester.test(
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"overrides the body's horizontal gravity symmetrically",
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(game) async {
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final ball1 = Ball.test(baseColor: baseColor)
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..initialPosition = Vector2(10, 0);
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await ball1.add(BallGravitatingBehavior());
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final ball2 = Ball.test(baseColor: baseColor)
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..initialPosition = Vector2(-10, 0);
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await ball2.add(BallGravitatingBehavior());
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await game.ensureAddAll([ball1, ball2]);
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game.update(1);
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expect(
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ball1.body.gravityOverride!.x,
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equals(-ball2.body.gravityOverride!.x),
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);
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expect(
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ball1.body.gravityOverride!.y,
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equals(ball2.body.gravityOverride!.y),
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);
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},
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);
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});
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}
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