WPF 客户端到屏幕点转换 [英] WPF client to screen point transformation

问题描述

我正在寻找一种方法来将与视觉相关的给定点转换为屏幕上的点.我找到了这个解决方案:

I'm looking for a way to transofrm given points that are relative to a Visual to Points on the screen. I found this solution:

http://social.msdn.microsoft.com/Forums/vstudio/en-US/b327c0bc-d27e-44fe-b833-c7db3400d632/how-to-get-control-屏幕坐标系中的位置

我无法理解 pointRoot 和 pointClient 之间的不同，因为它们似乎一直都相等:

I can't understand the different beween the pointRoot and the pointClient as they seem to be equal all the time:

// [...]
// Translate the point from the visual to the root.
GeneralTransform transformToRoot = relativeTo.TransformToAncestor(root);
Point pointRoot = transformToRoot.Transform(point);

// Transform the point from the root to client coordinates.
Matrix m = Matrix.Identity;
Transform transform = VisualTreeHelper.GetTransform(root);
if (transform != null)
    m = Matrix.Multiply(m, transform.Value);

Vector offset = VisualTreeHelper.GetOffset(root);
m.Translate(offset.X, offset.Y);
Point pointClient = m.Transform(pointRoot);
// [...]

(点击链接查看完整代码)

(for the full code click on the link)

似乎 VisualTreeHelper.GetOffset(root) 试图获取窗口的变换...

It seems that the VisualTreeHelper.GetOffset(root) tries to get the transform of the window...

推荐答案

假设您的 Visual 来自 Button 控件...您是否正在寻找这样的东西?:

Assuming that your Visual comes from a Button control... are you looking for something like this?:

Point locationFromWindow = button1.TranslatePoint(new Point(0, 0), this);

Point locationFromScreen = button1.PointToScreen(locationFromWindow);

注意:这些都是 Visual 类的方法，所以你也可以直接从你的 Visual 调用它们.

Note: these are both methods of the Visual class, so you can also call them from your Visual directly.

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