ArcGIS Engine 渲染----饼图.doc

根据帮助的VB程序改编的,画饼图,C#实现: private RgbColor GetRgbColor(int red, int green, int blue)k7G9hF3g6nZ0z*v0 3sNews.Net中国地理空间信息门户网站i,H!uA!kc%Z RgbColor rgbColor = new RgbColorClass();3sNews.Net中国地理空间信息门户网站w_%T;Q0N; rgbColor.Red = red;3sNews.Net 中国地理空间信息门户网站 v*NO+Fi|7D rgbColor.Green = green;3sNews.Net 中国地理空间信息门户网站+6EBt rgbColor.Blue = blue; return rgbColor;3sNews.Net 中国地理空间信息门户网站Nn &Cs4E,?pa,X private void btnPieChart_Click(object sender, EventArgs e)_ Q5iZ,L0 7Gp;CN%D,er0 IMap pMap = new MapClass();3sNews.Net中国地理空间信息门户网站 Dt;E3M1G IFeatureLayer pFLayer = (IFeatureLayer)axMapControl1.get_Layer(0);T6Z#p-#g0 IGeoFeatureLayer pGeoFeaLayer = (IGeoFeatureLayer)pFLayer; IChartRenderer pChartRenderer = new ChartRendererClass(); / Set up the field to draw charts IRendererFields pRenderFields = (IRendererFields)pChartRenderer;3sNews.Net 中国地理空间信息门户网站jf&k%v-u0O( E pRenderFields.AddField(Pop_cntry, null);3sNews.Net中国地理空间信息门户网站ppTMz%X7QcR IPieChartRenderer pPieChartRender = (IPieChartRenderer)pChartRenderer; /Calculate the max value of the data field to scale the chart-H;V+T#tU w0 /ICursor pCursor = new CursorClass(); IQueryFilter pQueryFilter = new QueryFilterClass();|_ g/hhB/|C 0 /IRowBuffer pRow = new RowBufferClass();3sNews.Net 中国地理空间信息门户网站7Y h oH ITable pTable = (ITable)pGeoFeaLayer;3sNews.Net中国地理空间信息门户网站Wnt%s.s,G|%L 6E pQueryFilter.AddField(Pop_cntry);3sNews.Net中国地理空间信息门户网站,a#b_ e/h ICursor pCursor = pTable.Search(pQueryFilter, true); int fieldIndex;3sNews.Net 中国地理空间信息门户网站Ee g*yf?g&O5g !H double MaxValue;5p9J:H_f0 bool firstValue;9tY?0 double fieldValue; fieldIndex = pTable.FindField(Pop_cntry);2l8v N*V RaKs0 firstValue = true;3sNews.Net中国地理空间信息门户网站 v;TLJ:C.PiSt MaxValue = 0;3sNews.Net中国地理空间信息门户网站pvgd5pV_C qH IRowBuffer pRow = pCursor.NextRow();3sNews.Net中国地理空间信息门户网站b(hF!W6Q#W while (pRow != null)Q3B4T i V;Cd0 3sNews.Net中国地理空间信息门户网站Y-j9G|8T, fieldValue =(double) pRow.get_Value(fieldIndex);BD#v#?)X0 if (firstValue)3sNews.Net中国地理空间信息门户网站#jWY- M |2tA-L 3sNews.Net中国地理空间信息门户网站E x4d%Qk MaxValue = fieldValue;Vdh/g4a:B&c0 firstValue = false;(SJ ,da sg0 if (fieldValue MaxValue)3sNews.Net中国地理空间信息门户网站#fq7B#sh8zl 7s *&ex#s*QS0 MaxValue = fieldValue;X q7e+DHg0 3sNews.Net中国地理空间信息门户网站(T8QcJjJI.F pRow = pCursor.NextRow();N0_.t!w8_ee40 IPieChartSymbol pPiechartSymbol = new Pie ChartSymbolClass();g/U W7 eQ-0 IFillSymbol pFillSymbol = new SimpleFillSymbolClass(); IChartSymbol pChartSymbol = (IChartSymbol)pPiechartSymbol;E E8O2O/IA$O,im)U0 pPiechartSymbol.Clockwise = true;!k bT?0 pPiechartSymbol.UseOutline = true; ILineSymbol pOutLine = new SimpleLineSymbolClass();3sNews.Net中国地理空间信息门户网站 q0G.kEU.r pOutLine.Color = GetRgbColor(255,0,255);3sNews.Net中国地理空间信息门户网站3I(F ?&vQ;G9v8t9M pOutLine.Width = 1;HX x- g-P0 pPiechartSymbol.Outline = pOutLine; IMarkerSymbol pMarkerSymbol = (IMarkerSymbol)pPiechartSymbol; /finally pChartSymbol.MaxValue = MaxValue; pMarkerSymbol.Size = 16; ISymbolArray pSymbolArray = (ISymbolArray)pPiechartSymbol;UnfzD%0 pFillSymbol.Color = GetRgbColor(213,212,252); pFillSymbol.Outline = pOutLine;G/E3t*R 6V:b1s0 pSymbolArray.AddSymbol(ISymbol)pFillSymbol); /set up the background pFillSymbol.Color = GetRgbColor(239,228,190);Oz(Yr9RT.Kc:Z0 pChartRenderer.BaseSymbol = (ISymbol)pFillSymbol; pChartRenderer.UseOverposter = false; pPieChartRender.MinSize = 6; pPieChartRender.MinValue = 453588;s , _%ZS8|0 pPieChartRender.FlanneryCompensation = false;zf z3hi k0 pPieChartRender.ProportionalBySum = true; pChartRenderer.ChartSymbol =