WPF 客户端到屏幕点转换
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原文地址: http://stackoverflow.com/questions/18103540/
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WPF client to screen point transformation
提问by HerpDerpington
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:
我正在寻找一种方法来转换与屏幕上的视觉点相关的给定点。我找到了这个解决方案：
I can't understand the different beween the pointRootand the pointClientas they seem to be equal all the time:
我无法理解 thepointRoot和 the 之间的不同，pointClient因为它们似乎一直都是平等的：
// [...]
// 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);
// [...]
(for the full code click on the link)
（完整代码请点击链接）
It seems that the VisualTreeHelper.GetOffset(root)tries to get the transform of the window...
似乎VisualTreeHelper.GetOffset(root)试图获得窗口的变换......
回答by Sheridan
Assuming that your Visualcomes from a Buttoncontrol... are you looking for something like this?:
假设你Visual来自一个Button控件......你在寻找这样的东西吗？：
Point locationFromWindow = button1.TranslatePoint(new Point(0, 0), this);
Point locationFromScreen = button1.PointToScreen(locationFromWindow);
Note: these are both methods of the Visualclass, so you can also call them from your Visualdirectly.
注意：这些都是Visual类的方法，所以你也可以Visual直接调用它们。
