arcengine的编辑功能比较死，遇到特殊要求的时候不能满足客户的要求，可能需要重写编辑功能，
arcengine的捕捉也不能单独应用，于是自己实现，如下，截图不是很好，鼠标形状没了，，，
bool bCreateElement = true;
int internalTime = 5;//时间间隔
int snapTime = 10;//初始值
IElement m_element = null; //界面绘制点元素
IPoint currentPoint = new PointClass(); //当前鼠标点
IPoint snapPoint = null; //捕捉到的点
IMovePointFeedback pFeedback = new MovePointFeedbackClass();
public void DoMouseMove(object sender, IMapControlEvents2_OnMouseMoveEvent e)
{
AxMapControl axMapControl1 = sender as AxMapControl;
currentPoint.PutCoords(e.mapX, e.mapY);
if (action == ActionType.CreateFeature)
{
snapTime++;
snapTime = snapTime%internalTime ;
ILayer layer = GetLayerByName(snapLayer, axMapControl1);
IFeatureLayer m_iFeatureLyr = layer as IFeatureLayer;
if (bCreateElement)
{
CreateMarkerElement(currentPoint,axMapControl1);
bCreateElement = false;
}
if (snapPoint == null)
ElementMoveTo(currentPoint, axMapControl1);
//鼠标自动扑获顶点
if (snapTime == 0)
snapPoint = Snapping(e.mapX, e.mapY, m_iFeatureLyr, axMapControl1);
if (snapPoint != null && snapTime == 0)
ElementMoveTo(snapPoint, axMapControl1);
}
}
/// <summary>
/// 捕捉
/// </summary>
/// <param name=”x”></param>
/// <param name=”y”></param>
/// <param name=”iFeatureLyr”></param>
/// <param name=”axMapControl1″></param>
/// <returns></returns>
public IPoint Snapping(double x, double y, IFeatureLayer iFeatureLyr, AxMapControl axMapControl1)
{
IPoint iHitPoint = null;
IMap iMap = axMapControl1.Map;
IActiveView iView = axMapControl1.ActiveView;
IFeatureClass iFClss = iFeatureLyr.FeatureClass;
IPoint point = new PointClass();
point.PutCoords(x,y);
double length = ConvertPixelsToMapUnits(axMapControl1.ActiveView, 8);
ITopologicalOperator pTopo = point as ITopologicalOperator;
IGeometry pGeometry = pTopo.Buffer(length).Envelope as IGeometry;
ISpatialFilter spatialFilter = new SpatialFilterClass();
spatialFilter.GeometryField = iFeatureLyr.FeatureClass.ShapeFieldName;
spatialFilter.SpatialRel = esriSpatialRelEnum.esriSpatialRelCrosses;
spatialFilter.Geometry = pGeometry;
IFeatureCursor cursor = iFClss.Search(spatialFilter, false);
IFeature iF = cursor.NextFeature();
if (iF == null) return null;
IPoint iHitPt = new ESRI.ArcGIS.Geometry.Point();
IHitTest iHitTest = iF.Shape as IHitTest;
double hitDist = 0;
int partIndex = 0;
int vertexIndex = 0;
bool bVertexHit = false;
// Tolerance in pixels for line hits
double tol = ConvertPixelsToMapUnits(iView, 8);
if (iHitTest.HitTest(point, tol, esriGeometryHitPartType.esriGeometryPartBoundary,
iHitPt, ref hitDist, ref partIndex, ref vertexIndex, ref bVertexHit))
{
iHitPoint = iHitPt;
}
axMapControl1.ActiveView.Refresh();
return iHitPoint;
}
/// <summary>
/// 创建新的element用于显示
/// </summary>
/// <param name=”point”></param>
/// <param name=”axMapControl1″></param>
public void CreateMarkerElement(IPoint point, AxMapControl axMapControl1)
{
IActiveView iView = axMapControl1.ActiveView;
IGraphicsContainer iGraphContainer = axMapControl1.Map as IGraphicsContainer;
//建立一个marker元素
IMarkerElement iMarkerElement = new MarkerElement() as IMarkerElement;
ISimpleMarkerSymbol iSym = new SimpleMarkerSymbol();
//符号化元素
IRgbColor iColor = new RgbColor();
iColor.Red = 0;
iColor.Blue = 100;
iColor.Green = 255;
iSym.Color = iColor;
IRgbColor iColor2 = new RgbColor();
iColor2.Red = 0;
iColor2.Blue = 0;
iColor2.Green = 0;
iSym.Outline = true;
iSym.OutlineColor = iColor2 as IColor;
iSym.OutlineSize = 1;
iSym.Size = 5;
iSym.Style = esriSimpleMarkerStyle.esriSMSCircle;
ISymbol symbol = iSym as ISymbol;
symbol.ROP2 = esriRasterOpCode.esriROPNotXOrPen;
iMarkerElement.Symbol = iSym;
m_element = iMarkerElement as IElement;
m_element.Geometry = point as IGeometry;
iGraphContainer.AddElement(m_element, 0);
iView.PartialRefresh(esriViewDrawPhase.esriViewGraphics, m_element, null);
IGeometry iGeo = m_element.Geometry;
pFeedback.Display = iView.ScreenDisplay;
pFeedback.Symbol = iSym as ISymbol;
pFeedback.Start(iGeo as IPoint, point);
}
/// <summary>
/// 移动元素
/// </summary>
/// <param name=”iPt”></param>
/// <param name=”axMapControl1″></param>
public void ElementMoveTo(IPoint iPt, AxMapControl axMapControl1)
{
//移动元素
pFeedback.MoveTo(iPt);
IGeometry iGeo1 = null;
IGeometry iGeoResult;
if (m_element != null)
{
iGeo1 = m_element.Geometry;
iGeoResult = pFeedback.Stop();
//map.ActiveView.Refresh();
m_element.Geometry = iGeoResult;
//更新该元素的位置
axMapControl1.ActiveView.GraphicsContainer.UpdateElement(m_element);
//重新移动元素
pFeedback.Start(iGeo1 as IPoint, iPt);
//map.ActiveView.Refresh();
axMapControl1.ActiveView.PartialRefresh(esriViewDrawPhase.esriViewGraphics, null, null);
}
}
public ILayer GetLayerByName(string layerName, AxMapControl axMapControl1)
{
for (int i = 0; i < axMapControl1.LayerCount; i++)
{
if (axMapControl1.get_Layer(i).Name.Equals(layerName))
return axMapControl1.get_Layer(i);
}
return null;
}
public double ConvertPixelsToMapUnits(IActiveView pActiveView, double pixelUnits)
{
double realWorldDisplayExtent;
int pixelExtent;
double sizeOfOnePixel;
pixelExtent = pActiveView.ScreenDisplay.DisplayTransformation.get_DeviceFrame().right – pActiveView.ScreenDisplay.DisplayTransformation.get_DeviceFrame().left;
realWorldDisplayExtent = pActiveView.ScreenDisplay.DisplayTransformation.VisibleBounds.Width;
sizeOfOnePixel = realWorldDisplayExtent / pixelExtent;
return pixelUnits * sizeOfOnePixel;
}
