当只有一个图钉时，如何确定 Bing 地图的正确缩放级别？

编程问答 2022-05-23

问题描述

我在地图上添加了一些图钉，然后“调整大小”或“正确缩放”它，以便显示所有图钉，但使远边缘的图钉几乎不在边界内，如下所示：

enter image description here

然而，如果只有一个图钉（如爱荷华州的以下案例，它只有一场内战），而不是尽可能接近零，它会一直缩小到 Skylab，像这样：

enter image description here

这是我用来“调整大小”地图的代码：

private void RightsizeZoomLevelForAllPushpins()
{
    try
    {
        // Set the view so that all pushpins are displayed,with a bit of a margin around them
        // from https://stackoverflow.com/questions/65779504/how-to-set-the-zoom-level-of-bing-map-to-just-wide-enough-to-display-all-pushpin/65781319#65781319
        var map = this.userControl11.myMap;
        var locations = map.Children.OfType<Pushpin>().Select(x => x.Location);
        //Margin
        var w = new Pushpin().Width;
        var h = new Pushpin().Height;
        var margin = new Thickness(w / 2,h,w / 2,0);

        //Set view
        map.SetView(locations,margin,0);
        currentZoomLevel = Convert.ToInt32(map.ZoomLevel);
        UncheckAllZoomLevelToolstripMenuItems();
        SetZoomMenuItem();
    }
    catch (Exception ex)
    {
        System.Windows.Forms.MessageBox.Show(ex.Message);
    }
}

如何使单图钉地图不仅居中而且尽可能放大？

更新

在对 Count 的两个引用添加括号，并在 else 块中添加一个“if”以便编译后，我仍然收到以下代码的两个错误：

private void RightsizeZoomLevelForAllPushpins()
{
    try
    {
        // Set the view so that all pushpins are displayed,with a bit of a margin around them
        var map = this.userControl11.myMap;
        var locations = map.Children.OfType<Pushpin>().Select(x => x.Location);

        if (locations.Count() == 1)
        {
            map.setView(locations[0],singlePinZoom);                
        }
        else if (locations.Count() > 1) 
        {
            //Margin
            var w = new Pushpin().Width;
            var h = new Pushpin().Height;
            var margin = new Thickness(w / 2,0);

            //Set view
            map.SetView(locations,0);
        }    
        currentZoomLevel = Convert.ToInt32(map.ZoomLevel);
        UncheckAllZoomLevelToolstripMenuItems();
        SetZoomMenuItem();
    }
    catch (Exception ex)
    {
        System.Windows.Forms.MessageBox.Show(ex.Message);
    }
}

他们是：

1>C:\Users\bclay\source\repos\MyMaps\MyMaps\Form1.cs(155,33,155,45): error CS0021: Cannot apply indexing with [] to an expression of type 'IEnumerable<Location>'
1>C:\Users\bclay\source\repos\MyMaps\MyMaps\Form1.cs(155,25,32): error CS1061: 'Map' does not contain a definition for 'setView' and no accessible extension method 'setView' accepting a first argument of type 'Map' could be found (are you missing a using directive or an assembly reference?)

顺便说一句，在编译项目之前，我在 Visual Studio 中看不到任何错误（在输入错误时它停止发现错误）。我不知道为什么......我没有改变任何设置......

更新 2

这是我现在使用的代码，它不只考虑一个图钉，但确实有效（请注意，“SetView”在此处不会引发异常）：

private void RightsizeZoomLevelForAllPushpins()
    {
        const int LEFT_TOP_RIGHT_MARGIN_ADDITION = 16;
        const int BOTTOM_MARGIN_ADDITION = 48;
        try
        {
            // Set the view so that all pushpins are displayed,with a bit of a margin around them
            // from https://stackoverflow.com/questions/65779504/how-to-set-the-zoom-level-of-bing-map-to-just-wide-enough-to-display-all-pushpin/65781319#65781319
            var map = this.userControl11.myMap;
            var locations = map.Children.OfType<Pushpin>().Select(x => x.Location);
            //Margin
            var w = new Pushpin().Width;
            var h = new Pushpin().Height;
            var margin = new Thickness((w / 2) + LEFT_TOP_RIGHT_MARGIN_ADDITION,h + LEFT_TOP_RIGHT_MARGIN_ADDITION,(w / 2) + LEFT_TOP_RIGHT_MARGIN_ADDITION,0 + BOTTOM_MARGIN_ADDITION);
            //Set view
            map.SetView(locations,0);
            currentZoomLevel = Convert.ToInt32(map.ZoomLevel);
            UncheckAllZoomLevelToolstripMenuItems();
            SetZoomMenuItem();
        }
        catch (Exception ex)
        {
            System.Windows.Forms.MessageBox.Show(ex.Message);
        }
    }

解决方法

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