arcengine实现在SceneControl中画线

前两天好不容易搞好了Map与Scene的二三维联动，以为将二维中的线连动到三维中变成3D样式的管子很简单，又卡了。再一次狂乱的在Esri论坛上找答案，有这样的贴子提到如果用SceneControl加载一个sxd文件，然后在上面画线是可以的，便是如何才能让加载shp文件的SceneControl也能画线呢，有很多人都碰到过这个问题。上面有一个贴子结贴后最佳答案是这样说的:

直接 IGraphicsContainer3D gc3d = new GraphicsLayer3DClass(); 在gc3d上画就OK了。

 

但是说实话，对于新手的我，我真不知道看了这句话，我应该么样去改我的代码。下面贴出摘自网上的一段在SceneControl控件上监听mouseDown事件连续画线的代码，我在这上面纠结了很久。

 

 

private void axSceneControl1_OnMouseDown(object sender, ESRI.ArcGIS.Controls.ISceneControlEvents_OnMouseDownEvent e)
        {
            IPoint pt = null;
            ISceneGraph pSG = axSceneControl1.SceneGraph;
            ISceneViewer pSW = pSG.ActiveViewer;
            object a;
            object b;
            pSG.Locate(pSW, e.x, e.y, esriScenePickMode.esriScenePickAll, true, out pt, out a, out b);
            if (pt == null) return;
            ptCol.Add(pt);
            int i = ptCol.Count;
            if (i < 1) return;

            IRgbColor pRgbColor = new RgbColorClass();
            pRgbColor.Blue = 255;
            pRgbColor.Green = 0;
            pRgbColor.Red = 0;
            ISimpleLine3DSymbol pSimpleLine3DSymbol = new SimpleLine3DSymbolClass();
            pSimpleLine3DSymbol.Style = esriSimple3DLineStyle.esriS3DLSTube;
            ILineSymbol pLineSymbol = pSimpleLine3DSymbol as ILineSymbol;
            pLineSymbol.Color = pRgbColor;
            pLineSymbol.Width = 10;
            //ILineElement pLineElement = new LineElementClass();
            //pLineElement.Symbol = pLineSymbol;

            //产生线段对象 line
            ILine pLine = new LineClass();
            IPoint fromPt = ptCol[i - 1];
            IPoint toPt = ptCol[i - 2];
            pLine.PutCoords(fromPt, toPt);

            //将线段对象添加到多义线对象polyline
            object Missing1 = Type.Missing;
            object Missing2 = Type.Missing;
            ISegment pSegment = pLine as ISegment;
            m_polyline.AddSegment(pSegment, ref Missing1, ref Missing2);

            //让Z值生效
            IZAware Zaware = m_polyline as IZAware;
            Zaware.ZAware = true;

            IGeometry geometry = (IGeometry)m_polyline;

            //更新到Graphics窗口
            IGraphicsContainer3D pGCon3D = axSceneControl1.Scene.BasicGraphicsLayer as IGraphicsContainer3D;
            IElement pElement = new LineElementClass();
            pElement.Geometry = geometry;

            ILineElement pLineElement = pElement as ILineElement;
            pLineElement.Symbol = pLineSymbol;

            pGCon3D.DeleteAllElements();
            pGCon3D.AddElement(pElement);
            axSceneControl1.Scene.SceneGraph.RefreshViewers();
        }

 

 是的，这段代码如果 axSceneControl1 加载的是.sxd文件确实可以画。且是画出的就是管子样式的线。那么么样改一下就能让加载.shp文件的axSceneControl1 也可以画呢。看代码:

 

 

public Form1()
        {
            InitializeComponent();

            _axesGraphicsContainer3D = new GraphicsLayer3DClass();
            ILayer layer = _axesGraphicsContainer3D as ILayer;
            layer.Name = "XXX";

            this.axSceneControl1.Scene.AddLayer(_axesGraphicsContainer3D as ILayer, true);
        }


private void axSceneControl1_OnMouseDown(object sender, ESRI.ArcGIS.Controls.ISceneControlEvents_OnMouseDownEvent e)
        {
            IPoint pt = null;
            ISceneGraph pSG = axSceneControl1.SceneGraph;
            ISceneViewer pSW = pSG.ActiveViewer;
            object a;
            object b;
            pSG.Locate(pSW, e.x, e.y, esriScenePickMode.esriScenePickAll, true, out pt, out a, out b);
            if (pt == null) return;
            ptCol.Add(pt);
            int i = ptCol.Count;
            if (i < 1) return;

            IRgbColor pRgbColor = new RgbColorClass();
            pRgbColor.Blue = 255;
            pRgbColor.Green = 0;
            pRgbColor.Red = 0;
            ISimpleLine3DSymbol pSimpleLine3DSymbol = new SimpleLine3DSymbolClass();
            pSimpleLine3DSymbol.Style = esriSimple3DLineStyle.esriS3DLSTube;
            ILineSymbol pLineSymbol = pSimpleLine3DSymbol as ILineSymbol;
            pLineSymbol.Color = pRgbColor;
            pLineSymbol.Width = 10;
            //ILineElement pLineElement = new LineElementClass();
            //pLineElement.Symbol = pLineSymbol;

            //产生线段对象 line
            ILine pLine = new LineClass();
            IPoint fromPt = ptCol[i - 1];
            IPoint toPt = ptCol[i - 2];
            pLine.PutCoords(fromPt, toPt);

            //将线段对象添加到多义线对象polyline
            object Missing1 = Type.Missing;
            object Missing2 = Type.Missing;
            ISegment pSegment = pLine as ISegment;
            m_polyline.AddSegment(pSegment, ref Missing1, ref Missing2);

            //让Z值生效
            IZAware Zaware = m_polyline as IZAware;
            Zaware.ZAware = true;

            IGeometry geometry = (IGeometry)m_polyline;

            //更新到Graphics窗口
    IGraphicsContainer3D pGCon3D = this._axesGraphicsContainer3D; //这一行代码要改 IGraphicsContainer3D pGCon3D = axSceneControl1.Scene.BasicGraphicsLayer as IGraphicsContainer3D;
            IElement pElement = new LineElementClass();
            pElement.Geometry = geometry;

            ILineElement pLineElement = pElement as ILineElement;
            pLineElement.Symbol = pLineSymbol;

            pGCon3D.DeleteAllElements();
            pGCon3D.AddElement(pElement);
            axSceneControl1.Scene.SceneGraph.RefreshViewers();
        }

 

 

O了，这样，你用SceneControl加载一个中国地图的shp文件进来，再在上面点击鼠标几下试下，就能看到效果了。

评论

1 楼 陈不二 2014-11-27  

IGraphicsContainer3D gc3d = new GraphicsLayer3DClass();
需要强制转换吗？楼主大神也你的代码
            _axesGraphicsContainer3D = new GraphicsLayer3DClass();
中也没有注明_axesGraphicsContainer3D的类型