获取 WPF 元素的真实视觉边界框? [英] Getting the true visual bounding box of a WPF element?

问题描述

对于我的问题的简化版本，我想计算布局转换(甚至可能是渲染转换)形状的边界框，以便我始终可以在形状周围完美地放置一个矩形，无论它是什么旋转或缩放可能.如果你能解决这个问题，我会很高兴.

For a simplified version of my problem, I would like to calculate the bounding box of a layout-transformed (possibly even render-transformed) shape, so that I can always fit a rectangle perfectly around the shape, no matter what its rotation or scale may be. If you can solve this, I will be happy.

更复杂的问题是计算任何框架元素的视觉边界框.视觉边界框"我的意思是框架元素内最顶部可见的像素决定了上界，最右边的可见像素决定了右界，等等.如果你能解决这个问题，我会更高兴.

The more complex problem is that of calculating the visual bounding box of any framework element. By 'visual bounding box' I mean the top-most visible pixel within the framework element determines the top-bound, the right-most visible pixel determines the right-bound, etc. If you can solve this, I will be even more happy.

我尝试过使用 LayoutInformation.GetLayoutSlot()，但这并没有以预期的方式工作.布局槽"实际上比实际边界大得多.我还尝试使用 VisualTreeHelper.GetDescendantBounds()，但由于我的测试形状的 VisualParent 受到保护，我无法访问此属性，因此决定在进一步研究之前先检查这里.

I have tried playing with LayoutInformation.GetLayoutSlot(), but this did not work in the expected manner. The 'layout slot' was actually MUCH larger than the actual bounds. I also tried using VisualTreeHelper.GetDescendantBounds(), but because of the VisualParent of my test shape being protected I could not manage to access this property, and decided to check here before I go any further into it.

我希望有人可以提供一种简单的方法来获取 WPF 中元素的真实视觉边界框，这是在所有变换之后计算的.如果我的问题没有说清楚，请告诉我.

I hope that somebody can provide an easy way of getting the true visual bounding box of an element in WPF, that is calculated AFTER all transforms. If I have not made something clear in my question, please let me know.

推荐答案

private Rect GetRectOfObject(FrameworkElement _element)
{
    Rect rectangleBounds = _element.RenderTransform.TransformBounds(
        new Rect(_element.RenderSize);

    return rectangleBounds;
}

也许这会有所帮助.

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