当我设置宽度时会以多边形边缘为中心向两边增宽，我只想向多边形内部增宽不想让宽度超过多边形边缘, 求帮助 谢谢
IFillShapeElement pPolygonElement = null;
ISimpleFillSymbol pSimpleFillSymbol = new SimpleFillSymbolClass();
ILineFillSymbol pSimpleFillSymbol = new LineFillSymbolClass();
IPolygon pPolygon = GetPolygon(); // Ring 多边形
ISimpleLineSymbol pSimpleLineSymbol = new SimpleLineSymbolClass();
pPolygonElement = new PolygonElementClass();
pSimpleLineSymbol.Width = 10; // 当我设置宽度时会以多边形边缘为中心向两边增宽，我只想向多边形内部增宽不想让宽度超过多边形边缘。
pSimpleLineSymbol.Style = esriSimpleLineStyle.esriSLSSolid;
pSimpleLineSymbol.Color = GetRBGColor(255,24,63);
pSimpleFillSymbol.Color = GetRBGColor(11,200,145);
pSimpleFillSymbol.OutLine = pSimpleLineSymbol;
IElement pElement = (IElement)pPolygonElement;
pElement.Geometry = pPolygon;
pPolygonElement.Symbol = pSimpleFillSymbol;
pGraphicsContainer.AddElement(pElement,0);
m_pActiveView.PartialRefresh(esriViewDrawPhase.esriViewGeography, null, null);