缩放和平移在GMap.net [英] Zoom and Pan in GMap.net

问题描述

我试图让 GMap.Net 控制多点触控启用，使用WPF内置的事件，但我没有成功。

I'm trying to make GMap.Net control multitouch enabled, using WPF build-in events but i wasn't successful.

我发现了一系列关于类似的这个并的此内容之一。在所有这些， ManipulationContainer 是一个帆布和放置其上可移动的控制，但在GMAP问题 ManipulationContainer 是 GMapControl 并没有在它的控制。如何使用 e.ManipulationDelta 数据进行缩放和移动？

I found a series of articles about multitouch like this and this one. In all of them, ManipulationContainer is a canvas and movable controls placed on it, but in GMap issue ManipulationContainer is GMapControl and there is no control over it. how can i use e.ManipulationDelta data to Zoom and Move?

GMapControl 有它通过增加或减少它，你可以放大或缩小了缩放属性。

The GMapControl has a Zoom property which by increase or decreasing it, you can zoom in or zoom out.

推荐答案

一个快速浏览一下代码表明的 GMapControl 是 ItemsContainer 。

A quick look at the code shows that the GMapControl is an ItemsContainer.

您应该能够restyle的 ItemsPanel 模板，并提供 IsManipulationEnabled 属性有：

You should be able to restyle the ItemsPanel template and supply the IsManipulationEnabled property there:

<g:GMapControl x:Name="Map" ...>
   <g:GMapControl.ItemsPanel>
       <ItemsPanelTemplate>
           <Canvas IsManipulationEnabled="True" />
       </ItemsPanelTemplate>
   </g:GMapControl.ItemsPanel>
   <!-- ... -->

在这一点上，你需要接线了窗口：

<Window ...
    ManipulationStarting="Window_ManipulationStarting"
    ManipulationDelta="Window_ManipulationDelta"
    ManipulationInertiaStarting="Window_InertiaStarting">

和提供在代码中的适当方法的背后（无耻地窃取，并从该的 MSDN演练）：

And supply the appropriate methods in the Code Behind (shamelessly stolen and adapted from this MSDN Walkthrough):

void Window_ManipulationStarting(
    object sender, ManipulationStartingEventArgs e)
{
    e.ManipulationContainer = this;
    e.Handled = true;
}

void Window_ManipulationDelta(object sender, ManipulationDeltaEventArgs e)
{
    // uses the scaling value to supply the Zoom amount
    this.Map.Zoom = e.DeltaManipulation.Scale.X;
    e.Handled = true;
}

void Window_InertiaStarting(
    object sender, ManipulationInertiaStartingEventArgs e)
{
    // Decrease the velocity of the Rectangle's resizing by 
    // 0.1 inches per second every second.
    // (0.1 inches * 96 pixels per inch / (1000ms^2)
    e.ExpansionBehavior.DesiredDeceleration = 0.1 * 96 / (1000.0 * 1000.0);
    e.Handled = true;
}

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