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75 lines
1.5 KiB
75 lines
1.5 KiB
import 'dart:async';
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import 'package:flame/components.dart';
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import 'package:flame/input.dart';
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import 'package:flame_forge2d/flame_forge2d.dart';
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import 'package:flutter/material.dart';
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class BasicGame extends Forge2DGame {
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BasicGame() {
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images.prefix = '';
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}
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}
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abstract class LineGame extends BasicGame with PanDetector {
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Vector2? _lineEnd;
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@override
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Future<void> onLoad() async {
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await super.onLoad();
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camera.followVector2(Vector2.zero());
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unawaited(add(_PreviewLine()));
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}
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@override
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void onPanStart(DragStartInfo info) {
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_lineEnd = info.eventPosition.game;
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}
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@override
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void onPanUpdate(DragUpdateInfo info) {
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_lineEnd = info.eventPosition.game;
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}
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@override
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void onPanEnd(DragEndInfo info) {
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if (_lineEnd != null) {
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final line = _lineEnd! - Vector2.zero();
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onLine(line);
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_lineEnd = null;
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}
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}
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void onLine(Vector2 line);
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}
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class _PreviewLine extends PositionComponent with HasGameRef<LineGame> {
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static final _previewLinePaint = Paint()
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..color = Colors.pink
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..strokeWidth = 0.2
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..style = PaintingStyle.stroke;
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Vector2? lineEnd;
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@override
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void update(double dt) {
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super.update(dt);
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lineEnd = gameRef._lineEnd?.clone()?..multiply(Vector2(1, -1));
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}
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@override
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void render(Canvas canvas) {
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super.render(canvas);
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if (lineEnd != null) {
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canvas.drawLine(
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Vector2.zero().toOffset(),
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lineEnd!.toOffset(),
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_previewLinePaint,
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);
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}
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}
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}
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