Question

我试图调整this HaxeFlixel教程，以使其更有趣，并学习如何在此过程中制作游戏。我正在做的第一件事就是限制移动到瓷砖。

然而，我已经走到了尽头 - 我所尝试的一切都没有奏效。我已经用以下内容替换了Player类中的movement()函数的内容（作为参考，每update()调用一次）：

if (FlxG.mouse.justReleased) {
    var _path:FlxPath;
    _path = new FlxPath(this, Reg.mWalls.findPath(getGraphicMidpoint(), FlxG.mouse.getWorldPosition()), speed);
}

（Reg.mWalls是我移动PlayState._mWalls以使其可以访问此代码的位置。）根据文档，这应该创建一个FlxPath并立即开始（因为第一个参数不是null），而是它产生了这个错误：

Null Object Reference
Called from openfl._v2.display.Stage.__pollTimers (openfl/_v2/display/Stage.hx line 1020)
Called from openfl._v2.display.Stage.__checkRender (openfl/_v2/display/Stage.hx line 317)
Called from openfl._v2.display.Stage.__render (openfl/_v2/display/Stage.hx line 1035)
Called from openfl._v2.display.DisplayObjectContainer.__broadcast (openfl/_v2/display/DisplayObjectContainer.hx line 280)
Called from openfl._v2.display.DisplayObject.__broadcast (openfl/_v2/display/DisplayObject.hx line 174)
Called from openfl._v2.display.DisplayObject.__dispatchEvent (openfl/_v2/display/DisplayObject.hx line 195)
Called from openfl._v2.events.EventDispatcher.dispatchEvent (openfl/_v2/events/EventDispatcher.hx line 100)
Called from openfl._v2.events.Listener.dispatchEvent (openfl/_v2/events/EventDispatcher.hx line 270)
Called from flixel.FlxGame.onEnterFrame (flixel/FlxGame.hx line 493)
Called from flixel.FlxGame.step (flixel/FlxGame.hx line 648)
Called from flixel.FlxGame.update (flixel/FlxGame.hx line 700)
Called from flixel.FlxState.tryUpdate (flixel/FlxState.hx line 155)
Called from PlayState.update (PlayState.hx line 125)
Called from flixel.group.FlxTypedGroup.update (flixel/group/FlxTypedGroup.hx line 89)
Called from Player.update (Player.hx line 47)
Called from Player.movement (Player.hx line 59)
Called from flixel.tile.FlxTilemap.findPath (flixel/tile/FlxTilemap.hx line 794)
Called from flixel.tile.FlxTilemap.computePathDistance (flixel/tile/FlxTilemap.hx line 1802)
Called from *._Function_1_1 (openfl/_v2/display/Stage.hx line 124)
AL lib: (EE) alc_cleanup: 1 device not closed

Answer 1

我最终自己解决了这个问题。

事实证明，我没有为拼贴0（空白拼贴）设置任何碰撞数据，而且我的地图上到处都是没有拼贴的斑点，因为它们在“外面”。

修复方法是使用方块0填充空白区域并将其添加到PlayState.create()：

Reg.mWalls.setTileProperties(0, FlxObject.ANY);

制作FlxPath时的空对象引用

1 个答案: