圆形遮罩的作用类似于矩形

我尝试使用drawCircle方法绘制的圆:

private function squareToRound(ability:MovieClip):MovieClip
{
    var container:MovieClip = new MovieClip();
    var newAbility:MovieClip = ability;
    var newMask:MovieClip = new MovieClip();

    newAbility.width = 43;
    newAbility.height = 43;
    newMask.x = newAbility.x + newAbility.width / 2;
    newMask.y = newAbility.y + newAbility.height / 2;

    container.addChild(newAbility);
    newMask.graphics.beginFill();
    newMask.graphics.drawCircle(0, 0, 8);
    newMask.graphics.endFill();
    container.addChild(newMask);

    newAbility.mask = newMask;
    return container;
}

... 作为SWF的资产:

private function squareToRound(ability:MovieClip):MovieClip
{
    var container:MovieClip = new MovieClip();
    var newAbility:MovieClip = ability;
    var newMask:MovieClip = new CircleAbilityMask();

    newAbility.width = 43;
    newAbility.height = 43;
    newMask.x = newAbility.x + newAbility.width / 2;
    newMask.y = newAbility.y + newAbility.height / 2;

    container.addChild(newAbility);
    container.addChild(newMask);

    newAbility.mask = newMask;
    return container;
}

结果是相同的。

我通过注释“newAbility.mask=newMask;”检查了掩码的外观线