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
