WPF 4触摸事件得到一个缩放手势中心 [英] WPF 4 touch events getting the center of a pinch gesture

问题描述

我使用的是.NET 4 Beta 2的触摸库和我试着去实现我的WPF应用程序缩放功能。

I am using the .net 4 beta 2 touch libraries, and Im trying to implement a zooming feature in my WPF application.

我可以得到缩放工作得很好，但我要的是放大的缩放手势的中心，我看不出如何在API的任何东西做到这一点。

I can get the zooming working just fine, but what I want is to zoom in on the center of the pinch gesture, and I cannot see anything in the API's about how to accomplish this.

有一些露出2个触点用捏的手势，这样我可以让他们的中心是方法或属性？

Is there some methods or properties that expose the 2 contacts being using in the pinch gesture so that I can get the center of them?

编辑：

使用我只是调查了 GetIntermediateTouchPoints TouchEventArgs 这似乎并没有给我我想要的东西。

I just investigated using the GetIntermediateTouchPoints method of TouchEventArgs which did not seem to give me what I want.

非常感谢$的方法b $ b选中

Thanks a lot Mark

推荐答案

原来，我的属性就在我所有的面前后沿。

Turns out that the properties I was after was right in front of me all along.

Manipulation2DDeltaEventArgs 类有 OriginX 和 OriginX 属性特定捏手势的中点，所以我只是使用其所有的好：）

the Manipulation2DDeltaEventArgs class has OriginX and OriginX properties that specific the center point of the pinch gesture, so Im just using that and its all good :)

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