转自原文 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); }
