IElement pEle = pLineEle as IElement;
pEle.Geometry = pLn;
pLn为一个ILine对象，想当然的以为它是IGeometry对象，可以赋值，结果爆出异常值不在预期范围内。
解决方法是将ILine转换为IPolyline对象，涉及到一些Geometry的基本操作。贴出一些可用的绘制元素的代码
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#region 获取RgbColor /// <summary> /// 获取RgbColor颜色对象 /// </summary> /// <param name="r"></param> /// <param name="g"></param> /// <param name="b"></param> /// <param name="alpa">可选参数,透明度.0代表透明</param> /// <returns></returns> public
static
IRgbColor getRgbColor(int
r, int
g, int
b, byte
alpa = 255) { IRgbColor pColor = new
RgbColorClass(); pColor.Red = r; pColor.Green = g; pColor.Blue = b; pColor.Transparency = alpa; return
pColor; } #endregion #region 获取随机颜色 /// <summary> /// 获取随机颜色 /// </summary> /// <returns></returns> public
static
IRgbColor getRandColor() { Random rd = new
Random(); IRgbColor myColor = new
RgbColorClass(); myColor.Red = rd.Next(0, 255); myColor.Blue = rd.Next(0, 255); myColor.Green = rd.Next(0, 255); return
myColor; } #endregion #region 绘制线 /// <summary> /// 绘制线 /// </summary> /// <param name="pLine"></param> /// <param name="pMapCtrl"></param> /// <param name="pLineSymbol">线符号</param> /// <param name="refresh">刷新</param> public
static
void
DrawLine(ILine pLine, IMapControl2 pMapCtrl, ISimpleLineSymbol pLineSymbol , bool
refresh) { ILineElement pLineEle = new
LineElementClass(); pLineEle.Symbol = pLineSymbol; IGeometryCollection pPolyline = new
PolylineClass(); ISegmentCollection pPath = new
PathClass(); object
m1 = Type.Missing; object
m2 = Type.Missing; pPath.AddSegment(pLine as
ISegment, ref
m1, ref
m2); pPolyline.AddGeometry(pPath as
IGeometry, ref
m1, ref
m2); IElement pEle = pLineEle as
IElement; pEle.Geometry = pPolyline as
IGeometry; IGraphicsContainer pGC = pMapCtrl.Map as
IGraphicsContainer; pGC.AddElement(pEle, 0); if
(refresh) { IActiveView pAv = pMapCtrl.ActiveView; pAv.PartialRefresh(esriViewDrawPhase.esriViewGraphics, null, null); } } #endregion #region 绘制文字注记 /// <summary> /// 绘制文字 /// </summary> /// <param name="pnt"></param> /// <param name="value"></param> /// <param name="ptxtSym"></param> /// <param name="pMapCtrl"></param> /// <param name="refresh"></param> public
static
void
DrawTextEle(IPoint pnt, string
strvalue, ITextSymbol ptxtSym, IMapControl2 pMapCtrl, bool
refresh) { ITextElement pTextEle = new
TextElementClass(); pTextEle.Text = strvalue; pTextEle.Symbol = ptxtSym; IElement pEle = pTextEle as
IElement; pEle.Geometry = pnt; IGraphicsContainer pGc = pMapCtrl.Map as
IGraphicsContainer; pGc.AddElement(pEle, 0); if
(refresh) { IActiveView pAv = pMapCtrl.ActiveView; pAv.PartialRefresh(esriViewDrawPhase.esriViewGraphics, null, null); } } #endregion #region 绘制polyline /// <summary> /// /// </summary> /// <param name="pPolyline"></param> /// <param name="pLineSym"></param> /// <param name="pMapCtrl"></param> /// <param name="refresh"></param> public
static
void
DrawPolyline(IPolyline pPolyline, ISimpleLineSymbol pLineSym, IMapControl2 pMapCtrl, bool
refresh) { ILineElement pLineEle = new
LineElementClass(); IElement pEle = pLineEle as
IElement; pLineEle.Symbol = pLineSym; pEle.Geometry = pPolyline; IGraphicsContainer pGc = pMapCtrl.Map as
IGraphicsContainer; pGc.AddElement(pEle, 0); if
(refresh) { IActiveView pAv = pMapCtrl.ActiveView; pAv.PartialRefresh(esriViewDrawPhase.esriViewGraphics, null, null); } } #endregion #region 绘制点 /// <summary> /// 绘制点 /// </summary> /// <param name="pnt"></param> /// <param name="pMapCtrl"></param> /// <param name="pColor">颜色</param> /// <param name="refresh">是否刷新</param> public
static
void
DrawPoint(IPoint pnt, IMapControl2 pMapCtrl, IRgbColor pColor, bool
refresh) { ISimpleMarkerSymbol pMarkerSymbol = new
SimpleMarkerSymbolClass(); pMarkerSymbol.Color = pColor; pMarkerSymbol.Style = esriSimpleMarkerStyle.esriSMSCircle; pMarkerSymbol.Size = 3; IElement pEle; IMarkerElement pMe = new
MarkerElementClass(); pMe.Symbol = pMarkerSymbol; pEle = pMe as
IElement; pEle.Geometry = pnt; IActiveView pav = pMapCtrl.ActiveView; IGraphicsContainer pGc = pMapCtrl.Map as
IGraphicsContainer; pGc.AddElement(pEle, 0); if
(refresh) pav.PartialRefresh(esriViewDrawPhase.esriViewGraphics, null, null); } #endregion |
ArcEngine开发：IElement.Geometry 值不在预期范围内 + 元素绘制代码,布布扣,bubuko.com
ArcEngine开发：IElement.Geometry 值不在预期范围内 + 元素绘制代码
原文：http://www.cnblogs.com/DayDreamEveryWhere/p/3617049.html