ArcGIS 要素闪烁

ArcGIS 要素闪烁

通过双击要素图例，闪烁定位到要素，并且闪烁一段时间：                   

IFeatureLayer featureLayer = layer as IFeatureLayer;
                    ITable table = featureLayer as ITable;
                    IRow row = table.GetRow((int)data);
                    IFeature feature = row as IFeature;                   
                    IEnvelope envelope = feature.Shape.Envelope;                   
                    switch(feature.Shape.GeometryType)
                    {
                        case esriGeometryType.esriGeometryPoint:
                            IPoint point = feature.Shape as IPoint;
                            envelope.Expand(2.7, 2.7, true);
                            axMapControl1.FlashShape(point, 1, 300, null);
                            axMapControl1.Extent = envelope;
                            Application.DoEvents();
                            axMapControl1.Refresh();
                            axMapControl1.FlashShape(point, 6, 300, null);
                            break;
                        case esriGeometryType.esriGeometryPolyline:
                            IPolyline polyline = feature.Shape as IPolyline;
                            envelope.Expand(1.7, 1.7, true);
                            axMapControl1.FlashShape(polyline, 1, 300, null);
                            axMapControl1.Extent = envelope;
                            Application.DoEvents();
                            axMapControl1.Refresh();
                            axMapControl1.FlashShape(polyline, 15, 300, null);
                            break;
                        case esriGeometryType.esriGeometryPolygon:
                            IPolygon polygon = feature.Shape as IPolygon;
                            envelope.Expand(1.7, 1.7, true);
                            axMapControl1.FlashShape(polygon, 1, 300, null);
                            axMapControl1.Extent = envelope;
                            Application.DoEvents();
                            axMapControl1.Refresh();
                            ITopologicalOperator topOperator = polygon as ITopologicalOperator;
                            IPolyline line = new PolylineClass();
                            line=topOperator.Boundary as IPolyline;
                            axMapControl1.FlashShape(line, 15, 300, null);
                            break;

                    }

 

 

第一种：通过FlashShape来实现闪烁功能

public void PositionFlashElement(AxMapControl axMapControl, IElement pElement)
{
IGeometry pGeometry = pElement.Geometry;
ICartographicLineSymbol ipCartographicLineSymbol;
ISimpleFillSymbol ipSimpleFillSymbol;
ISimpleMarkerSymbol ipSimpleMarkersymbol;
ISymbol ipSymbol = null;
IRgbColor ipColor;
IPoint pPoint = new PointClass();
pPoint.X = pGeometry.Envelope.LowerLeft.X + pGeometry.Envelope.Width / 2;
pPoint.Y = pGeometry.Envelope.LowerLeft.Y + pGeometry.Envelope.Height / 2;
axMapControl.CenterAt(pPoint);
//pGeometry.Envelope.LowerLeft
int Size;

 

ipColor = new RgbColor();
ipColor.Red = 255;
Size = 10;

//esriGeometryType type = pGeometry.GeometryType;

if (type == esriGeometryType.esriGeometryPolyline)
{
ipCartographicLineSymbol = new CartographicLineSymbol();

ipSymbol = (ISymbol)ipCartographicLineSymbol;
ipSymbol.ROP2 = esriRasterOpCode.esriROPNotXOrPen;
ipCartographicLineSymbol.Width = Size;
ipCartographicLineSymbol.Color = ipColor;
}
else if (type == esriGeometryType.esriGeometryPolygon)
{
ipSimpleFillSymbol = new SimpleFillSymbol();
ipSymbol = (ISymbol)ipSimpleFillSymbol;
ipSimpleFillSymbol.Color = ipColor;
}
else if (type == esriGeometryType.esriGeometryPoint || type == esriGeometryType.esriGeometryMultipoint)
{
ipSimpleMarkersymbol = new SimpleMarkerSymbol();
ipSymbol = (ISymbol)ipSimpleMarkersymbol;
ipSymbol.ROP2 = esriRasterOpCode.esriROPWhite;
ipSimpleMarkersymbol.Color = ipColor;
ipSimpleMarkersymbol.Size = 20;
}
axMapControl.FlashShape(pGeometry, 3, 300, ipSymbol);
}

 

        第二种：编辑自己闪烁的对象

 自己定义一个FlashObjectsClass类来完成闪烁的功能,网上很对这样类的原代码.

     //获取对应要素

            LayerIdentifiedResult layerResult = identifiedResultsList[layerIndex];

            //点击了图层下的要素

            if (featureIndex > -1)

            {

                IFeatureIdentifyObj identifyObjDefault = layerResult.IdentifiedFeatureObjList[featureIndex];

                IFeature featureDefault = (identifyObjDefault as IRowIdentifyObject).Row as IFeature;

                //显示属性

                ShowFeatureAttributes(featureDefault);

                //判断是否闪烁要素

                if (doFlash)

                {

                    (identifyObjDefault as IIdentifyObj).Flash(associateMapControl.ActiveView.ScreenDisplay);

                }

            }

            //点击了图层，同时闪烁图层下的所有要素图形

            else

            {

                flashObjects.FlashObjects(layerResult);

            }

 

 第三种：结合IHookActions的DoAction方法并搭上esriHookActionsFlash动作，这样做效果很接近arcmap中的效果，速度也比较快。

 

          Action方面有6个constant，可以根据需要选择.

Constant	Value	Description
esriHookActionsFlash	0	Flash the geometry.
esriHookActionsPan	1	Pan to the geometry.
esriHookActionsZoom	2	Zoom to the geometry.
esriHookActionsGraphic	3	Create a graphic for the geometry.
esriHookActionsLabel	4	Create a graphic and label for the geometry.
esriHookActionsCallout	5	Create a callout for the geometry.

 完成闪烁的代码如下：

IHookActions hookActions;
hookActions.DoAction(feature.Shape, esriHookActions.esriHookActionsPan);

　Application.DoEvent();
hookActions.DoAction(feature.Shape,esriHookActions.esriHookActionsFlash);

 

 

第四种   接口IIdentify的返回对象IFeatureIdentifyObj也可以实现这个功能。特摘录代码如下：

 

Dim pEnvs As IEnvelope
pEnvs = AxMapControl1.TrackRectangle

Dim pLayer As IFeatureLayer
pLayer = pMainMap.Layer(0)
Dim pIdentify As IIdentify
pIdentify = pLayer
Dim pArr As IArray
pArr = pIdentify.Identify(pEnvs)

Dim pFtIdenObj As IFeatureIdentifyObj
Dim pIdenObj As IIdentifyObj
If Not pArr Is Nothing Then
Dim j As Integer
For j = 0 To pArr.Count - 1
        pFtIdenObj = pArr.Element(j)
        pIdenObj = pFtIdenObj
        pIdenObj.Flash(pMainAV.ScreenDisplay)
        pIdenObj = Nothing
        pFtIdenObj = Nothing
Next
End If