private void DrawElement(IGeometry pGeo)
{
if (pGeo == null)
{
return;
}
//线
if (pGeo is IPolyline)
{
ISimpleLineSymbol linesymbol = new SimpleLineSymbolClass();
linesymbol.Color = ExportMap.Getcolor(255, 255, 255);
linesymbol.Width = 1;
ILineElement m_LineElement = new LineElementClass();
m_LineElement.Symbol = linesymbol;
//
IElement pEle = m_LineElement as IElement;
pEle.Geometry = pGeo;
this.axMapcontrol.ActiveView.GraphicsContainer.AddElement(pEle, 0);
this.axMapcontrol.ActiveView.Refresh();
}
}
private void DrawFlowDirection(IFeature feature, IMapControlDefault mapc, esriFlowDirection flowdir)
{
//获取线段中点
IPolyline polyline = feature.Shape as IPolyline;
IPoint midpoint = new PointClass();
polyline.QueryPoint(esriSegmentExtension.esriNoExtension, polyline.Length / 2, false, midpoint);
//绘制特征符号
IArrowMarkerSymbol arrowSymbol = new ArrowMarkerSymbolClass();
ISimpleMarkerSymbol markerSymbol = new SimpleMarkerSymbolClass();
IElement element = null;
//绘制沿顺着数字化流向
if (flowdir == esriFlowDirection.esriFDWithFlow)
{
arrowSymbol.Size = 12;
arrowSymbol.Color = ExportMap.Getcolor(0, 0, 0);
arrowSymbol.Angle = GetlineAngle(polyline.FromPoint, polyline.ToPoint);
//绘制
element = new MarkerElementClass();
element.Geometry = midpoint;
((IMarkerElement)element).Symbol = arrowSymbol;
//设置绘制元素名称
((IElementProperties)element).Name = "Flow";
}
//方向顺着逆数字化的
if (flowdir == esriFlowDirection.esriFDAgainstFlow)
{
arrowSymbol.Size = 12;
arrowSymbol.Color = ExportMap.Getcolor(0, 0, 0);
arrowSymbol.Angle = GetlineAngle(polyline.FromPoint, polyline.ToPoint);
//绘制
element = new MarkerElementClass();
element.Geometry = midpoint;
((IMarkerElement)element).Symbol = arrowSymbol;
//设置绘制元素名称
((IElementProperties)element).Name = "Flow";
}
//方向未初始化的
if (flowdir == esriFlowDirection.esriFDUninitialized)
{
markerSymbol.Color = ExportMap.Getcolor(0, 0, 0);
markerSymbol.Size = 8;
element = new MarkerElementClass();
element.Geometry = midpoint;
((IMarkerElement)element).Symbol = markerSymbol;
//设置绘制元素名称
((IElementProperties)element).Name = "Flow";
}
//方向未定义的
if (flowdir == esriFlowDirection.esriFDIndeterminate)
{
markerSymbol.Color = ExportMap.Getcolor(0, 0, 0);
markerSymbol.Size = 8;
element = new MarkerElementClass();
element.Geometry = midpoint;
((IMarkerElement)element).Symbol = markerSymbol;
//设置绘制元素名称
((IElementProperties)element).Name = "Flow";
}
mapc.ActiveView.GraphicsContainer.AddElement(element, 0);
}