flutter - 使用 Flame 定位 SpriteComponent

Question

更新 :我创建了一个较小的示例，可能更好地说明了本期中的问题:https://github.com/flame-engine/flame/issues/200

短版:

我正在实例化 SpriteComponents在位置 (50, 50), (50, 100), (100, 50), (100, 100).
但是，渲染后它们看起来像这样:


是什么产生了这种奇怪的偏移量？如何正确渲染 SpriteComponents ?

更长的版本(带代码):
我想通过实现类似 bunnymark 来测试火焰的性能。 .
作为节省性能的第一次尝试，我正在加载单个 Sprite并用它来生产许多SpriteComponents .
SpriteComponent包裹在 Bunny 中类(class)。现在它什么都不做，最终它会处理运动:

import 'dart:ui';

import 'package:flame/components/component.dart';
import 'package:flame/sprite.dart';

class Bunny {
  SpriteComponent bunny;

  Bunny(Sprite bunnySprite, double x, double y, double w, double h)
      : this.bunny =
            SpriteComponent.fromSprite(w, h, bunnySprite) {
    bunny.x = x;
    bunny.y = y;
  }

  void render(Canvas c) {
    bunny.render(c);
  }

  void update(double t) {}
}

兔子在我的游戏类中被实例化:

import 'dart:ui';

import 'package:bunnymark/components/bunny.dart';
import 'package:flame/flame.dart';
import 'package:flame/game.dart';
import 'package:flame/sprite.dart';
import 'package:flutter/cupertino.dart';

class BunnyMark extends Game {
  Size screenSize;
  List<Bunny> bunnies;
  Sprite bunnySprite;

  BunnyMark() {
    initialize();
  }

  void initialize() async {
    resize(await Flame.util.initialDimensions());

    bunnies = List<Bunny>();
    bunnySprite = Sprite('rabbitv3_tron.png');

    bunnies.add(Bunny(bunnySprite, 50, 50, 30, 30));
    bunnies.add(Bunny(bunnySprite, 50, 100, 30, 30));
    bunnies.add(Bunny(bunnySprite, 100, 100, 30, 30));
    bunnies.add(Bunny(bunnySprite, 100, 50, 30, 30));
  }

  void render(Canvas canvas) {
    Rect bgRect = Rect.fromLTWH(0, 0, screenSize.width, screenSize.height);
    Paint bgPaint = Paint();
    bgPaint.color = Color(0xff000000);
    canvas.drawRect(bgRect, bgPaint);

    bunnies.forEach((bunny) {
      bunny.render(canvas);
    });
  }

  void update(double t) {
    bunnies.forEach((bunny) => bunny.update(t));
  }

  void resize(Size size) {
    screenSize = size;
    super.resize(size);
  }
}

游戏从 main.dart 开始:

import 'package:bunnymark/bunnymark.dart';
import 'package:flame/util.dart';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';

void main() async {
  WidgetsFlutterBinding.ensureInitialized();
  Util flameUtil = Util();
  await flameUtil.fullScreen();
  await flameUtil.setOrientation(DeviceOrientation.portraitUp);

  BunnyMark game = BunnyMark();
  runApp(game.widget);
}

Answer 1

由于您使用的是 Game而不是 BaseGame (这会为你做)，你对你的render负责实现以重置每个 Sprite 的 Canvas 。

允许组件在 Canvas 上进行任何他们想要的修改，并且需要重置 BaseGame(或在您的情况下为 Game)。

所以当你这样做时

bunnies.forEach((bunny) {
  bunny.render(canvas);
});

您可能想要执行以下操作:

bunnies.forEach((bunny) {
  canvas.save();
  bunny.render(canvas);
  canvas.restore();
});

或者，作为替代方案，请查看 BaseGame为您解决很多这些问题的类(class):)