如何在 WP7 中放大和缩小图像? [英] How to zoom in and zoom out Images in WP7?

问题描述

我制作了一个显示图像的应用程序.现在我想实现放大和缩小功能(通过使用两个指尖)，就像在本机 Windows 手机照片查看器应用程序中一样.关于如何进行的任何想法.

I have made an application which displays Images .Now I want to implement zoom in and zoom out feature(by using two fingertip's) as in native windows phone photo viewer application.Any idea on how to proceed .

提前致谢.

推荐答案

也许最方便的方法是包含 Silverlight用于 Windows Phone 工具包.这包含一个 GestureService 将有助于捏合和旋转触摸手势.您可以将其应用于这样的图像:-

Perhaps the most expedient approach would be to include the Silverlight for Windows Phone Toolkit. This contains a GestureService that will help with pinch and rotate touch gestures. You could apply it to an image like this:-

 <Image Source="someSourceUrl" RenderTransformOrigin="0.5, 0.5" CacheMode="BitmapCache">
     <Image.RenderTransform>
         <CompositeTransform x:Name="transform" />
     </Image.RenderTransform>
     <toolkit:GestureService.GestureListener>
         <toolkit:GestureListener PinchStarted="OnPinchStarted" PinchDelta="OnPinchDelta" />
     </toolkit:GestureService.GestureListener>
 </Image>

然后在代码隐藏中:-

    private void OnPinchStarted(object sender, PinchStartedGestureEventArgs e)
    {
        initialAngle = transform.Rotation;
        initialScale = transform.ScaleX;
    }

    private void OnPinchDelta(object sender, PinchGestureEventArgs e)
    {
        transform.Rotation = initialAngle + e.TotalAngleDelta;
        transform.ScaleX = initialScale * e.DistanceRatio;
        transform.ScaleY = initialScale * e.DistanceRatio;
    }

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