Question

我有一个简单的UIComponent覆盖measure和updateDisplayList来绘制一条垂直线。我通过考虑笔划宽度来计算线的起点和终点。代码如下。我希望将界限打印为（x：0 y：0 w：1 h：300），但它打印（x：0 y：0 w：1 h：299），即高度为299而不是300.我错过了吗？

override protected function measure():void
{
    super.measure();
    measuredWidth = measuredMinWidth = 300;
    measuredHeight = measuredMinHeight = 300;
}

override protected function updateDisplayList(unscaledWidth:Number, unscaledHeight:Number):void
{
    super.updateDisplayList(unscaledWidth, unscaledHeight);
    var stroke:SolidColorStroke = new SolidColorStroke(0xd8d8d8, 1, 1);

    var g:Graphics = graphics;
    g.clear();

    var bX:Number;
    var bY:Number;
    var tX:Number;
    var tY:Number;
    var bW:Number;
    var bH:Number;

    bX = stroke.weight * 0.5;
    bY = stroke.weight * 0.5;
    tX = stroke.weight * 0.5;
    tY = unscaledHeight - 1 - stroke.weight * 0.5;
    bW = unscaledWidth - stroke.weight;
    bH = unscaledHeight - stroke.weight;
    trace ("From (", bX, ",", bY, ") To (", tX, ",", tY, ")");

    stroke.apply(g, null, null);
    g.moveTo(bX, bY);
    g.lineTo(tX, tY);
    trace ("Bounds:", getBounds(this));
 }

Answer 1

为什么使用神奇的数字→-1？您已将所有参数作为参数。更改tY的计算：

tY = unscaledHeight - stroke.weight * 0.5;

flash / actionscript中的边界不正确

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