ArcGIS Engine 渲染----饼图 - 圣殿GIS

private RgbColor GetRgbColor(int red, int green, int blue)
        {
            RgbColor rgbColor = new RgbColorClass();
            rgbColor.Red = red;
            rgbColor.Green = green;
            rgbColor.Blue = blue;

return rgbColor;
%Vf B-Ok+i#vp0 }

        private void btnPieChart_Click(object sender, EventArgs e)
*l(e"J/^4R1C0        {
            IMap pMap = new MapClass();
;A2g;s8[q+\&d0e:D lJ0            IFeatureLayer pFLayer = (IFeatureLayer)axMapControl1.get_Layer(0);
m['O,rL.?5t'^0            IGeoFeatureLayer pGeoFeaLayer = (IGeoFeatureLayer)pFLayer;

IChartRenderer pChartRenderer = new ChartRendererClass();

// Set up the field to draw charts

            IRendererFields pRenderFields = (IRendererFields)pChartRenderer;
T8AEE/S+OC\@+_o y0            pRenderFields.AddField("Pop_cntry", null);
            IPieChartRenderer pPieChartRender = (IPieChartRenderer)pChartRenderer;

//Calculate the max value of the data field to scale the chart

H"fcPl$F0 //ICursor pCursor = new CursorClass();

            IQueryFilter pQueryFilter = new QueryFilterClass();
S^+s\2W/k'p;e&K0            //IRowBuffer pRow = new RowBufferClass();
"w ?f b-YS#X _A0            ITable pTable = (ITable)pGeoFeaLayer;
'X8qcz*HR,b0            pQueryFilter.AddField("Pop_cntry");
SG9o,iF1G2eb0            ICursor pCursor = pTable.Search(pQueryFilter, true);

            int fieldIndex;
4A&zWsS5O}:y0            double MaxValue;
            bool firstValue;
hh(Le)D0            double fieldValue;

            fieldIndex = pTable.FindField("Pop_cntry");
            firstValue = true;
2k3SV X_}Nj'b0            MaxValue = 0;

            IRowBuffer pRow = pCursor.NextRow();
            while (pRow != null)
            {
&b:t B:Dj U0                fieldValue =(double) pRow.get_Value(fieldIndex);
                if (firstValue)
,Gt.\#Lz0                {
(T%k*bG iAM6w:l0                    MaxValue = fieldValue;
gcdh1B#y1hV,tRw U0                    firstValue = false;
                }

                if (fieldValue > MaxValue)
                {
:G'g s;VB a6@6~0                    MaxValue = fieldValue;
                }
                pRow = pCursor.NextRow();
            }

IPieChartSymbol pPiechartSymbol = new Pie ChartSymbolClass();
(w3@1tc%R"g&_0 IFillSymbol pFillSymbol = new SimpleFillSymbolClass();

            IChartSymbol pChartSymbol = (IChartSymbol)pPiechartSymbol;
            pPiechartSymbol.Clockwise = true;
'T6QdYp&G)R8@0            pPiechartSymbol.UseOutline = true;

            ILineSymbol pOutLine = new SimpleLineSymbolClass();
N(B,b8a!{2o0            pOutLine.Color = GetRgbColor(255,0,255);
\-N.rwA&P"Lk0            pOutLine.Width = 1;
            pPiechartSymbol.Outline = pOutLine;

IMarkerSymbol pMarkerSymbol = (IMarkerSymbol)pPiechartSymbol;

//finally

pChartSymbol.MaxValue = MaxValue;

pMarkerSymbol.Size = 16;

ISymbolArray pSymbolArray = (ISymbolArray)pPiechartSymbol;
}'E+N? S0 pFillSymbol.Color = GetRgbColor(213,212,252);

pFillSymbol.Outline = pOutLine;
&^^3bI%wM0 pSymbolArray.AddSymbol((ISymbol)pFillSymbol);

//set up the background

pFillSymbol.Color = GetRgbColor(239,228,190);
[r5B,j%[0 pChartRenderer.BaseSymbol = (ISymbol)pFillSymbol;

pChartRenderer.UseOverposter = false;

pPieChartRender.MinSize = 6;

            pPieChartRender.MinValue = 453588;
            pPieChartRender.FlanneryCompensation = false;
            pPieChartRender.ProportionalBySum = true;

            pChartRenderer.ChartSymbol = (IChartSymbol)pPiechartSymbol;
            pChartRenderer.CreateLegend();
]Xy$jG To0            pGeoFeaLayer.Renderer =(IFeatureRenderer) pChartRenderer;

this.axLicenseControl1.Refresh();

}

发表于 2007-07-22 12:04 圣殿GIS 阅读(2628) 评论(4) 编辑收藏举报