flame/doc/examples/effects/infinite_effects/lib/main.dart

import 'package:flame/effects/move_effect.dart';
import 'package:flame/effects/scale_effect.dart';
import 'package:flame/effects/rotate_effect.dart';
import 'package:flame/gestures.dart';
import 'package:flame/position.dart';
import 'package:flame/flame.dart';
import 'package:flame/game.dart';
import 'package:flutter/material.dart';

import 'dart:math';

import './square.dart';

void main() async {
  WidgetsFlutterBinding.ensureInitialized();
  await Flame.util.fullScreen();
  runApp(MyGame().widget);
}

class MyGame extends BaseGame with TapDetector {
  Square greenSquare;
  Square redSquare;
  Square orangeSquare;

  MyGame() {
    final green = Paint()..color = const Color(0xAA338833);
    final red = Paint()..color = const Color(0xAA883333);
    final orange = Paint()..color = const Color(0xAABB6633);
    greenSquare = Square(green, 100, 100);
    redSquare = Square(red, 200, 200);
    orangeSquare = Square(orange, 200, 400);
    add(greenSquare);
    add(redSquare);
    add(orangeSquare);
  }

  @override
  void onTapUp(TapUpDetails details) {
    final dx = details.localPosition.dx;
    final dy = details.localPosition.dy;

    greenSquare.clearEffects();
    redSquare.clearEffects();
    orangeSquare.clearEffects();

    greenSquare.addEffect(MoveEffect(
      destination: Position(dx, dy),
      speed: 250.0,
      curve: Curves.bounceInOut,
      isInfinite: true,
      isAlternating: true,
    ));

    redSquare.addEffect(ScaleEffect(
      size: Size(dx, dy),
      speed: 250.0,
      curve: Curves.easeInCubic,
      isInfinite: true,
      isAlternating: true,
    ));

    orangeSquare.addEffect(RotateEffect(
      radians: (dx + dy) % (2 * pi),
      speed: 1.0, // Radians per second
      curve: Curves.easeInOut,
      isInfinite: true,
      isAlternating: true,
    ));
  }
}