ArcGIS Engine 线段绘制研究

基本步骤

构建形状

1. 创建 IPoint
IPoint m_Point = new PointClass();
m_Point.PutCoords(x, y);

2. 创建 IPointCollection
IPointCollection m_PointCollection = new PolylineClass();
m_PointCollection.AddPoint(m_Point, ref Type.Missing, ref Type.Missing);

3. 创建 IPolyline
IPolyline m_Polyline = new PolylineClass();
m_Polyline = m_PointCollection as IPolyline;

4. 创建 IElement
// Element 不能实例化，需要用其派生类实例化
IElement m_Element = m_SimpleLineSymbol as IElement;
m_Element.Geometry = m_Polyline;

设置形状样式
1. 创建 ISimpleLineSymbol
ISimpleLineSymbol m_SimpleLineSymbol = new SimpleLineSymbolClass();

2. 创建 ILineElement
ILineElement m_LineElement = new LineElementClass();
m_LineElement.Symbol = m_SimpleLineSymbol;

加载到地图
IMap m_Map = axMapControl1.Map;
IActiveView m_ActiveView = m_Map as IActiveView;
IGraphicsContainer m_Container = m_Map as IGraphicsContainer;

m_Container.AddElement(m_Element, 0);

m_Active.PartialRefresh(esriViewDrawPhase.esriViewGraphics, null, null);

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其他方法

private void DrawLine()
        {
            ILineElement pLineElement;
            IElement pLElement;

            IPolyline pLine;

            RgbColor pColor = new RgbColor();
            pColor.Red = 0;
            pColor.Green = 0;
            pColor.Blue = 255;
            
            ISimpleLineSymbol pSimpleLineSymbol = new SimpleLineSymbolClass();
            pSimpleLineSymbol.Color = pColor;
            pSimpleLineSymbol.Width = 5;

            pLineElement = new LineElementClass();
            pLineElement.Symbol = pSimpleLineSymbol;

            pLElement = pLineElement as IElement;

            IRubberBand pRubberBand;
            pRubberBand = new RubberLineClass();
            pLine = pRubberBand.TrackNew(axMapControl1.ActiveView.ScreenDisplay, null) as IPolyline;

            pLElement.Geometry = pLine;

            IGraphicsContainer pGraphicsContainer;
            pGraphicsContainer = axMapControl1.ActiveView as IGraphicsContainer;//把地图的当前view作为图片的容器
            
            pGraphicsContainer.AddElement(pLElement, 0);//把刚刚的element转到容器上
            axMapControl1.ActiveView.PartialRefresh(esriViewDrawPhase.esriViewGraphics, null, null);
        }