ActionScript-清除带有JointStyle.MITER错误的图形?

在清除/重绘图形时,我遇到了使用JointStyle.MITER的不良效果。

当线的厚度大大增加时,即使是线的圆形区域也会受到斜接样式的影响。虽然我觉得这很不幸,但这是可以理解的,而不是我所指的bug。虫子(?)在减小线条粗细并没有完全清除图形时发生,每次粗细更改时代码都会指示这样做,使线条图形的伪影保留在线条原来的位置。文物也留下了尖锐的边缘,而不仅仅是圆角。

您可以通过运行下面的示例代码来测试这一点。使用左右键盘箭头更改圆形矩形笔划的粗细。

更新:

package
{
import flash.display.CapsStyle;
import flash.display.JointStyle;
import flash.display.LineScaleMode;
import flash.display.Sprite;
import flash.events.Event;
import flash.events.KeyboardEvent;
import flash.events.MouseEvent;
import flash.ui.Keyboard;

public class StrokeWidth extends Sprite
    {
    private var roundRect:Sprite = new Sprite();
    private var strokeThickness:Number = 6;

    public function StrokeWidth()
        {
        addEventListener(Event.ADDED_TO_STAGE, init);
        }

    private function init(evt:Event):void
        {
        removeEventListener(Event.ADDED_TO_STAGE, init);
        stage.addEventListener(KeyboardEvent.KEY_DOWN, keyDownEventListener);
        roundRect.addEventListener(MouseEvent.MOUSE_DOWN, mouseEventListener);
        roundRect.addEventListener(MouseEvent.MOUSE_UP, mouseEventListener);

        drawRoundRect();
        roundRect.x = roundRect.y = 100;
        addChild(roundRect);
        }

    private function drawRoundRect():void
        {
        roundRect.graphics.clear();
        roundRect.graphics.lineStyle(strokeThickness, 0x000000, 1.0, true, LineScaleMode.NONE, CapsStyle.NONE, JointStyle.MITER);
        roundRect.graphics.beginFill(0xFF0000);
        roundRect.graphics.drawRoundRect(0, 0, 400, 200, 100);
        }

    private function mouseEventListener(evt:MouseEvent):void
        {
        switch  (evt.type)
                {
                case MouseEvent.MOUSE_DOWN: roundRect.startDrag();  break;
                case MouseEvent.MOUSE_UP:   roundRect.stopDrag();   
                }
        }

    private function keyDownEventListener(evt:KeyboardEvent):void
        {
        switch  (evt.keyCode)
                {
                case Keyboard.LEFT:     strokeThickness -= 1;       break;
                case Keyboard.RIGHT:    strokeThickness += 1;
                }

        drawRoundRect();
        }
    }
}