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我如何在 windows phone 8 中实现捏缩放和多点触控功能。在我的应用程序中，我在网格中添加了 3 个图像容器，我需要对我的图像执行上述操作。请任何人帮助我在我的应用程序中实现该功能。提前致谢。

斯特兹

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2 回答 2

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从 codeplex 尝试以下库：

https://multitouch.codeplex.com/

它执行缩放/旋转图像时所需的计算。

于 2012-11-29T06:39:37.800 回答
1

我的适用于 WP7.5 和 WP8 的解决方案：

XAML 代码

<StackPanel  x:Name="Scroll" Margin="0">
                    <Image  CacheMode="BitmapCache" Name="FrontCover"   Source="{Binding FullCover}"  >
                        <Image.RenderTransform>
                            <CompositeTransform x:Name="transform" ScaleX="1" ScaleY="1"  />
                        </Image.RenderTransform>
                        <toolkit:GestureService.GestureListener>
                            <toolkit:GestureListener   PinchDelta="OnPinchDelta" PinchStarted="OnPinchStarted" DragDelta="OnDragDelta"  />
                        </toolkit:GestureService.GestureListener>
                    </Image>
            </StackPanel>


 double initialScale;

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

    private void OnPinchDelta(object sender, PinchGestureEventArgs e)
    {
        var curZoom = initialScale * e.DistanceRatio;
        if (curZoom >= 1 && curZoom <= 3)
        {
            transform.ScaleX = curZoom;
            transform.ScaleY = curZoom;

        }
    }

    private void OnDragDelta(object sender, DragDeltaGestureEventArgs e)
    {
        transform.CenterX = (transform.CenterX - e.HorizontalChange);
        transform.CenterY = (transform.CenterY - e.VerticalChange);

        if (transform.CenterX < 0)
            transform.CenterX = 0;
        else if ( transform.CenterX > Scroll.ActualWidth)
            transform.CenterX = Scroll.ActualWidth;
        else if (transform.CenterX > (FrontCover.Height * transform.ScaleX))
            transform.CenterX = FrontCover.Height * transform.ScaleX;

        if (transform.CenterY < 0)
            transform.CenterY = 0;
        else if (transform.CenterY > Scroll.ActualHeight)
            transform.CenterY = Scroll.ActualHeight;
        else if (transform.CenterY > (FrontCover.Height * transform.ScaleY))
            transform.CenterY = FrontCover.Height * transform.ScaleY;

    }

认为它应该帮助别人

于 2012-11-29T08:39:41.427 回答