feat: plunger

lib/game/components/boundaries.dart

@@ -0,0 +1,41 @@
+import 'package:flame_forge2d/body_component.dart';
+import 'package:flame_forge2d/flame_forge2d.dart';
+import 'package:flame_forge2d/forge2d_game.dart';
+import 'package:forge2d/forge2d.dart';
+
+List<Wall> createBoundaries(Forge2DGame game) {
+  final topLeft = Vector2.zero();
+  final bottomRight = game.screenToWorld(game.camera.viewport.effectiveSize);
+  final topRight = Vector2(bottomRight.x, topLeft.y);
+  final bottomLeft = Vector2(topLeft.x, bottomRight.y);
+
+  return [
+    Wall(topLeft, topRight),
+    Wall(topRight, bottomRight),
+    Wall(bottomRight, bottomLeft),
+    Wall(bottomLeft, topLeft),
+  ];
+}
+
+class Wall extends BodyComponent {
+  Wall(this.start, this.end);
+
+  final Vector2 start;
+  final Vector2 end;
+
+  @override
+  Body createBody() {
+    final shape = EdgeShape()..set(start, end);
+
+    final fixtureDef = FixtureDef(shape)
+      ..restitution = 0.0
+      ..friction = 0.3;
+
+    final bodyDef = BodyDef()
+      ..userData = this
+      ..position = Vector2.zero()
+      ..type = BodyType.static;
+
+    return world.createBody(bodyDef)..createFixture(fixtureDef);
+  }
+}

lib/game/components/components.dart

@@ -0,0 +1,2 @@
+export 'boundaries.dart';
+export 'plunger.dart';

lib/game/components/plunger.dart

@@ -0,0 +1,31 @@
+import 'package:flame_forge2d/body_component.dart';
+import 'package:flame_forge2d/flame_forge2d.dart';
+
+class Plunger extends BodyComponent {
+  Plunger(this._position);
+
+  final Vector2 _position;
+
+  @override
+  Body createBody() {
+    final shape = PolygonShape()..setAsBoxXY(2.5, 1.5);
+
+    final fixtureDef = FixtureDef(shape)..friction = 0.1;
+
+    final bodyDef = BodyDef()
+      ..userData = this
+      ..position = _position
+      ..type = BodyType.dynamic;
+
+    return world.createBody(bodyDef)..createFixture(fixtureDef);
+  }
+
+  void pull() {
+    body.linearVelocity = Vector2(0, -5);
+  }
+
+  void release() {
+    final velocity = (_position.y - body.position.y) * 9;
+    body.linearVelocity = Vector2(0, velocity);
+  }
+}

lib/game/game.dart

@@ -1,2 +1,3 @@
+export 'components/components.dart';
 export 'pinball_game.dart';
 export 'view/pinball_game_page.dart';

lib/game/pinball_game.dart

@@ -1,3 +1,55 @@
+import 'package:flame/input.dart';
+import 'package:flame_forge2d/flame_forge2d.dart';
 import 'package:flame_forge2d/forge2d_game.dart';
+import 'package:flutter/material.dart';
+import 'package:flutter/services.dart';
+import 'package:pinball/game/game.dart';
 
-class PinballGame extends Forge2DGame {}
+class PinballGame extends Forge2DGame with KeyboardEvents {
+  late Plunger plunger;
+
+  @override
+  Future<void> onLoad() async {
+    await super.onLoad();
+
+    final boundaries = createBoundaries(this)..forEach(add);
+    final bottomWall = boundaries[2];
+
+    final center = screenToWorld(camera.viewport.effectiveSize / 2);
+
+    await add(plunger = Plunger(Vector2(center.x, center.y - 50)));
+
+    final prismaticJointDef = PrismaticJointDef()
+      ..initialize(
+        plunger.body,
+        bottomWall.body,
+        bottomWall.body.position,
+        Vector2(0, 0),
+      )
+      ..localAnchorA.setFrom(Vector2(0, 0))
+      ..enableLimit = true
+      ..upperTranslation = 0
+      ..lowerTranslation = -5
+      ..collideConnected = true;
+
+    world.createJoint(prismaticJointDef);
+    print(prismaticJointDef.localAnchorA);
+    print(prismaticJointDef.localAnchorB);
+  }
+
+  @override
+  KeyEventResult onKeyEvent(
+    RawKeyEvent event,
+    Set<LogicalKeyboardKey> keysPressed,
+  ) {
+    if (event is RawKeyUpEvent &&
+        event.data.logicalKey == LogicalKeyboardKey.space) {
+      plunger.release();
+    }
+    if (event is RawKeyDownEvent &&
+        event.data.logicalKey == LogicalKeyboardKey.space) {
+      plunger.pull();
+    }
+    return KeyEventResult.handled;
+  }
+}