Windows Phone 8 中的地图点击事件/鼠标按下事件? [英] Map tap event / mouse down event in windows phone 8?

问题描述

我正在使用 Windows 手机模拟器.我写了一个非常简单的程序:当用户点击地图一次时，在地图上绘制一个标记.

I am using the windows phone emulator. I wrote a very simple program: draw a marker on the map when the user tap the map once.

然后我使用了 map_tap 事件，得到了点击的位置如下，

Then I used map_tap event, and get the tapped location as follows,

private void map_Tap(object sender, System.Windows.Input.GestureEventArgs e)
{
    Point p = e.GetPosition(null);
    GeoCoordinate s = map.ConvertViewportPointToGeoCoordinate(p);

    Ellipse myCircle = new Ellipse();
    myCircle.Fill = new SolidColorBrush(Colors.Blue);
    myCircle.Height = 20;
    myCircle.Width = 20;
    myCircle.Opacity = 50;

    MapOverlay myLocationOverlay = new MapOverlay();
    myLocationOverlay.Content = myCircle;
    myLocationOverlay.PositionOrigin = new Point(0, 0);
    myLocationOverlay.GeoCoordinate = s;

    MapLayer myLocationLayer = new MapLayer();
    myLocationLayer.Add(myLocationOverlay);

    map.Layers.Add(myLocationLayer);
}

问题是，我得到的点不是鼠标(在模拟器中是鼠标而不是手指)点击的点.它比我点击的位置低一些(大约低 50 像素).

The problem is that, the point I get is not the point where the mouse (in the emulator it is a mouse but not a finger) clicked. It is some distance lower (about 50 pixels lower) than where I clicked.

所以无论我在模拟器中点击哪里，都会在我点击的地方下方绘制圆圈，这有点奇怪.

So wherever I click in the emulator, the circle is drawn below where I clicked, it's some kind of weird.

我的代码有问题吗?

非常感谢.

推荐答案

GestureEventArgs.GetPosition() 方法接受一个参数，指定要获取相对于哪个 UIElement 的坐标(请参阅 MSDN 文档).所以，尝试做

The GestureEventArgs.GetPosition() method takes a parameter specifying what UIElement to get the coordinate relative to (see the MSDN documentation). So, try doing

Point p = e.GetPosition(map);

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