IChartRenderer の利用

VBA
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`strPopField1 =` `"POP1990"` `Dim` `pMxdoc` `As` `IMxDocument` `Dim` `pMap` `As` `IMap` `Dim` `pLayer` `As` `ILayer` `Dim` `pFeatLayer` `As` `IFeatureLayer` `Dim` `pFClass` `As` `IFeatureClass` `Dim` `pGeoFeatureLayer` `As` `IGeoFeatureLayer` `Set` `pMxdoc = ThisDocument` `Set` `pMap = pMxdoc.FocusMap` `Set` `pLayer = pMap.Layer(0)` `Set` `pFeatLayer = pLayer` `Set` `pGeoFeatureLayer = pFeatLayer` `Set` `pFClass = pFeatLayer.FeatureClass` `Dim` `pChartRenderer` `As` `IChartRenderer` `Dim` `pRendererFields` `As` `IRendererFields` `Dim` `pPieChartRenderer` `As` `IPieChartRenderer` `Set` `pChartRenderer =` `New` `ChartRenderer` `' Set up the field to draw charts` `Set` `pRendererFields = pChartRenderer` `pRendererFields.AddField strPopField1` `Set` `pPieChartRenderer = pChartRenderer` `' Calculate the max value of the data field to scale the chart` `Dim` `pTable` `As` `ITable` `Dim` `pCursor` `As` `ICursor` `Dim` `pQueryFilter` `As` `IQueryFilter` `Dim` `pRow` `As` `IRowBuffer` `Set` `pTable = pGeoFeatureLayer` `Set` `pQueryFilter =` `New` `QueryFilter` `pQueryFilter.AddField strPopField1` `Set` `pCursor = pTable.Search(pQueryFilter,` `True)` `Dim` `fieldIndex` `As` `Long` `Dim` `maxValue` `As` `Double` `Dim` `firstValue` `As` `Boolean` `Dim` `fieldValue` `As` `Double` `fieldIndex = pTable.FindField(strPopField1)` `firstValue =` `True` `maxValue = 0` `' Iterate across each feature` `Set` `pRow = pCursor.NextRow` `Do` `While` `Not` `pRow` `Is` `Nothing` `fieldValue = pRow.Value(fieldIndex)` `If` `firstValue` `Then` `' Special case for the first value in a feature class` `maxValue = fieldValue` `firstValue =` `False` `Else` `If` `fieldValue > maxValue` `Then` `' we've got a new biggest value` `maxValue = fieldValue` `End` `If` `End` `If` `Set` `pRow = pCursor.NextRow` `Loop` `If` `(maxValue <= 0)` `Then` `MsgBox` `"Failed to calculate the maximum value or max value is 0."` `Exit` `Sub` `End` `If` `' Set up the chart marker symbol to use with the renderer` `Dim` `pPieChartSymbol` `As` `IPieChartSymbol` `Dim` `pFillSymbol` `As` `IFillSymbol` `Dim` `pMarkerSymbol` `As` `IMarkerSymbol` `Dim` `pSymbolArray` `As` `ISymbolArray` `Dim` `pChartSymbol` `As` `IChartSymbol` `Set` `pPieChartSymbol =` `New` `PieChartSymbol` `Set` `pChartSymbol = pPieChartSymbol` `pPieChartSymbol.Clockwise =` `True` `pPieChartSymbol.UseOutline =` `True` `Dim` `pOutline` `As` `ILineSymbol` `Set` `pOutline =` `New` `SimpleLineSymbol` `pOutline.Color = GetRGBColor(255, 0, 255)` `pOutline.Width = 1` `pPieChartSymbol.Outline = pOutline` `Set` `pMarkerSymbol = pPieChartSymbol` `' Finally we've got the biggest value, set this into the symbol` `pChartSymbol.maxValue = maxValue` `' This is the maximum height of the bars` `pMarkerSymbol.size = 16` `Set` `pSymbolArray = pPieChartSymbol` `Set` `pFillSymbol =` `New` `SimpleFillSymbol` `' This is a pastel purple` `pFillSymbol.Color = GetRGBColor(213, 212, 252)` `pFillSymbol.Outline = pOutline` `pSymbolArray.AddSymbol pFillSymbol` `' set up the background symbol to use tan color` `Set` `pFillSymbol =` `New` `SimpleFillSymbol` `pFillSymbol.Color = GetRGBColor(239, 228, 190)` `Set` `pChartRenderer.BaseSymbol = pFillSymbol` `' Disable overpoaster so that charts appear in the centre of polygons` `pChartRenderer.UseOverposter =` `False` `' Update the renderer and refresh the screen` `pPieChartRenderer.MinSize = 6` `pPieChartRenderer.MinValue = 453588` `pPieChartRenderer.FlanneryCompensation =` `False` `pPieChartRenderer.ProportionalBySum =` `True` `' Now set the piechart symbol into the renderer` `Set` `pChartRenderer.ChartSymbol = pPieChartSymbol` `pChartRenderer.Label =` `"Population"` `pChartRenderer.CreateLegend` `Set` `pGeoFeatureLayer.Renderer = pChartRenderer` `pMxdoc.ActiveView.Refresh` `pMxdoc.UpdateContents` `End` `Sub` `' This function returns an RGB colour object initialised with the supplied Red Green and Blue values.` `' All parameters range from 0 to 255 in value` `Private` `Function` `GetRGBColor(yourRed` `As` `Long, yourGreen` `As` `Long, _` `yourBlue` `As` `Long)` `As` `IRgbColor` `Dim` `pRGB` `As` `IRgbColor` `Set` `pRGB =` `New` `RgbColor` `With` `pRGB` `.Red = yourRed` `.Green = yourGreen` `.Blue = yourBlue` `.UseWindowsDithering =` `True` `End` `With` `Set` `GetRGBColor = pRGB` `End` `Function`