ArcGIS Engine二次开发VS2013使用MuneStirp控件实现两点距离测量

下面是实现两点距离测量的步骤：

1. 在 ArcGIS Engine 项目中添加 MuneStirp 控件，该控件用于显示测量结果。

2. 在菜单栏中添加“测量距离”按钮，单击该按钮后，进入测量模式。

3. 在地图上单击两个点，计算它们之间的距离，并将结果显示在 MuneStirp 控件中。

下面是具体实现方法：

1. 添加 MuneStirp 控件

在 Visual Studio 中打开 ArcGIS Engine 项目，右键单击工具箱中的“常规”选项卡，选择“选择项”，在“COM 组件”选项卡中选中“MapControl Tools 1.0 Type Library”和“MapControl 1.0 Type Library”，单击“确定”按钮，将 MuneStirp 控件添加到工具箱中。

在窗体设计器中，将 MuneStirp 控件拖放到窗体上，调整其大小和位置。

2. 添加测量按钮

在窗体设计器中，右键单击菜单栏，选择“添加新项”，创建一个名为“测量距离”的按钮。

在按钮的 Click 事件中，添加以下代码：

private void btnMeasureDistance_Click(object sender, EventArgs e)
{
    // 进入测量模式
    axMapControl1.CurrentTool = null;
    axMapControl1.MousePointer = esriControlsMousePointer.esriPointerCrosshair;
    axMapControl1.MouseDownEvent += new IMapControlEvents2_Ax_OnMouseDownEventHandler(axMapControl1_MouseDownEvent);
}

3. 实现测量距离功能

在 axMapControl1_MouseDownEvent 事件中，获取鼠标单击的坐标，并计算两点之间的距离。将距离显示在 MuneStirp 控件中。

private void axMapControl1_MouseDownEvent(object sender, IMapControlEvents2_OnMouseDownEvent e)
{
    if (e.button == 1) // 左键单击
    {
        if (axMapControl1.CurrentTool == null) // 如果不在测量模式中
        {
            // 进入测量模式
            axMapControl1.MousePointer = esriControlsMousePointer.esriPointerCrosshair;
            double x1 = e.mapX;
            double y1 = e.mapY;
            IPoint point1 = new PointClass();
            point1.PutCoords(x1, y1);
            IGraphicsContainer graphicsContainer = axMapControl1.ActiveView as IGraphicsContainer;
            IElement element1 = GetPointElement(point1);
            graphicsContainer.AddElement(element1, 0);
            axMapControl1.Refresh(esriViewDrawPhase.esriViewGraphics, null, null);

            axMapControl1.MouseDownEvent -= new IMapControlEvents2_Ax_OnMouseDownEventHandler(axMapControl1_MouseDownEvent);
            axMapControl1.MouseDownEvent += new IMapControlEvents2_Ax_OnMouseDownEventHandler(axMapControl1_MouseDownEvent2);
        }
    }
}

private void axMapControl1_MouseDownEvent2(object sender, IMapControlEvents2_OnMouseDownEvent e)
{
    if (e.button == 1) // 左键单击
    {
        double x2 = e.mapX;
        double y2 = e.mapY;
        IPoint point2 = new PointClass();
        point2.PutCoords(x2, y2);
        IGraphicsContainer graphicsContainer = axMapControl1.ActiveView as IGraphicsContainer;
        IElement element2 = GetPointElement(point2);
        graphicsContainer.AddElement(element2, 0);
        axMapControl1.Refresh(esriViewDrawPhase.esriViewGraphics, null, null);

        // 计算距离
        double distance = GetDistance(point1, point2);
        IFormattedTextSymbol symbol = new TextSymbolClass();
        symbol.Background = GetColor(255, 255, 255);
        symbol.Border = true;
        symbol.Color = GetColor(0, 0, 0);
        symbol.HorizontalAlignment = esriTextHorizontalAlignment.esriTHACenter;
        symbol.VerticalAlignment = esriTextVerticalAlignment.esriTVABottom;
        symbol.Angle = GetAngle(point1, point2);
        ITextElement textElement = new TextElementClass();
        textElement.Symbol = symbol;
        textElement.Text = string.Format("{0:0.00} 米", distance);
        textElement.ScaleText = true;
        IElement element3 = textElement as IElement;
        element3.Geometry = GetMidPoint(point1, point2);
        graphicsContainer.AddElement(element3, 0);
        axMapControl1.Refresh(esriViewDrawPhase.esriViewGraphics, null, null);

        // 显示结果
        muneStrip.Items.Clear();
        muneStrip.Items.Add(string.Format("距离：{0:0.00} 米", distance));
        muneStrip.Visible = true;

        // 退出测量模式
        axMapControl1.MousePointer = esriControlsMousePointer.esriPointerDefault;
        axMapControl1.MouseDownEvent -= new IMapControlEvents2_Ax_OnMouseDownEventHandler(axMapControl1_MouseDownEvent2);
        axMapControl1.MouseDownEvent += new IMapControlEvents2_Ax_OnMouseDownEventHandler(axMapControl1_MouseDownEvent);
    }
}

private IElement GetPointElement(IPoint point)
{
    ISimpleMarkerSymbol symbol = new SimpleMarkerSymbolClass();
    symbol.Style = esriSimpleMarkerStyle.esriSMSCircle;
    symbol.Color = GetColor(255, 0, 0);
    symbol.Size = 6;
    ISimpleMarkerSymbol symbol2 = new SimpleMarkerSymbolClass();
    symbol2.Style = esriSimpleMarkerStyle.esriSMSCircle;
    symbol2.Color = GetColor(255, 255, 255);
    symbol2.Size = 4;
    IMultiLayerMarkerSymbol multiLayerMarkerSymbol = new MultiLayerMarkerSymbolClass();
    multiLayerMarkerSymbol.AddLayer(symbol);
    multiLayerMarkerSymbol.AddLayer(symbol2);
    IMarkerElement markerElement = new MarkerElementClass();
    markerElement.Symbol = multiLayerMarkerSymbol as IMarkerSymbol;
    IElement element = markerElement as IElement;
    element.Geometry = point;
    return element;
}

private double GetDistance(IPoint point1, IPoint point2)
{
    IProximityOperator proximityOperator = point1 as IProximityOperator;
    return proximityOperator.ReturnDistance(point2);
}

private double GetAngle(IPoint point1, IPoint point2)
{
    double dx = point2.X - point1.X;
    double dy = point2.Y - point1.Y;
    double angle = Math.Atan2(dy, dx) * 180 / Math.PI;
    return angle;
}

private IPoint GetMidPoint(IPoint point1, IPoint point2)
{
    IPoint midPoint = new PointClass();
    midPoint.X = (point1.X + point2.X) / 2;
    midPoint.Y = (point1.Y + point2.Y) / 2;
    return midPoint;
}

private IColor GetColor(int red, int green, int blue)
{
    IRgbColor color = new RgbColorClass();
    color.Red = red;
    color.Green = green;
    color.Blue = blue;
    return color;
}

以上代码中，GetPointElement 方法用于创建点元素；GetDistance 方法用于计算两点之间的距离；GetAngle 方法用于计算两点之间的夹角；GetMidPoint 方法用于计算两点之间的中点；GetColor 方法用于创建颜色对象。