flame example

main.dart

import 'dart:math' as math;
import 'dart:ui';

import 'package:flame/components.dart';
import 'package:flame/game.dart';
import 'package:flame/gestures.dart';
import 'package:flame/palette.dart';
import 'package:flutter/material.dart';
import 'package:flame/extensions.dart';

void main() {
  runApp(
    GameWidget(
      game: MyGame(),
    ),
  );
}

class Palette {
  static const PaletteEntry white = BasicPalette.white;
  static const PaletteEntry red = PaletteEntry(Color(0xFFFF0000));
  static const PaletteEntry blue = PaletteEntry(Color(0xFF0000FF));
}

class Square extends PositionComponent with HasGameRef<MyGame> {
  Square() {
    size = Vector2.all(128);
    anchor = Anchor.center;
  }
  static const SPEED = 0.25;
  static Paint white = Palette.white.paint;
  static Paint red = Palette.red.paint;
  static Paint blue = Palette.blue.paint;

  @override
  void render(Canvas c) {
    super.render(c);

    c.drawRect(size.toRect(), white);
    c.drawRect(const Rect.fromLTWH(0, 0, 3, 3), red);
    c.drawRect(Rect.fromLTWH(width / 2, height / 2, 3, 3), blue);
  }

  // @override
  // void update(double t) {
  //   super.update(t);
  //   angle += SPEED * t;
  //   angle %= 2 * math.pi;
  //   // print(angle);
  // }

  @override
  void onMount() {
    super.onMount();
    // print(gameRef.squareSize);
  }
}

class MyComponent extends PositionComponent with Tapable, HasGameRef<MyGame> {
  double speed = 100;
  Vector2 tappedPoint;

  MyComponent() {
    this.addChild(
        Square()
          ..x = 100
          ..y = 100,
        gameRef: gameRef);
  }

  @override
  void update(double dt) {
    super.update(dt);
    if (tappedPoint != null && tappedPoint.distanceTo(position) > 10) {
      angle += position.angleToSigned(tappedPoint);
      print(angle);
      final direction = (tappedPoint - position).normalized();
      position.add(direction * (dt * speed));
    }
  }

  @override
  bool onTapDown(TapDownDetails details) {
    tappedPoint = details.localPosition
        .toVector2(); // Import the Offset extension to access toVector2
    return true;
  }
}

class MyGame extends BaseGame with HasTapableComponents {
  final double squareSize = 128;
  bool running = true;

  MyGame() {
    add(MyComponent());
    // add(Square()
    //   ..x = 100
    //   ..y = 100);
  }
}