如何反转在​​Silverlight / WPF裁剪几何？ [英] How to invert clipping geometry in Silverlight/WPF?

问题描述

的<一个href="http://msdn.microsoft.com/en-us/library/system.windows.uielement.clip.aspx"><$c$c>UIElement.Clip房地产需要一个<一个href="http://msdn.microsoft.com/en-us/library/system.windows.media.geometry.aspx"><$c$c>Geometry对象，并用它来剪裁掉的UIElement 的外面。我愿做几何逆和打眼到元素代替。

The UIElement.Clip property takes a Geometry object and uses it to clip away the outside of the UIElement. I would like to do the geometric inverse and punch a hole into the element instead.

任何人都知道如何做到这一点？

Anyone know how to do this?

我想创建剪辑的几何形状会工作的一个倒置的版本，但我不能找到一个方法来做到这一点。

I imagine creating an inverted version of the clip geometry would work, but I can't find a way to do this.

修改看来，WPF有 几何。结合 的，可用于对减去另一个几何，虽然这不是在Silverlight可用。如果是这样，我可以从元素的边框的矩形减去剪辑的几何形状，并用它来代替夹

EDIT It seems that WPF has Geometry.Combine which can be used to subtract one geometry from another, though this isn't available in Silverlight. If it were, I could subtract the clip geometry from the rectangle of the element's bounding rectangle, and use that to clip instead.

推荐答案

在Silverlight的一种方法是使用 GeometryGroup ，其中包括该集团一个非常大的矩形开始在一个遥远的消极立场。

One approach in Silverlight is to use a GeometryGroup and include in the group a very large rectangle starting at a distant negative position.

例如下面的蓝色方块的小方孔： -

For example the following blue square has smaller square hole:-

    <Rectangle Fill="Blue" HorizontalAlignment="Center" VerticalAlignment="Center" Height="200" Width="200">
        <Rectangle.Clip>
            <GeometryGroup>
                <RectangleGeometry Rect="-2048 -2048 4096 4096" />
                <RectangleGeometry Rect="100 100 50 50" />
            </GeometryGroup>
        </Rectangle.Clip>
    </Rectangle>

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