internal static void Render()
{
if (CboLayers.GetSelectedLayer() == null ||
CboFields.GetSelectedField() == null ||
s_selectedRenderer == null ||
CboColors.GetSelectedColor() == null ||
CboClasses.GetSelectedClass() == null)
{
return;
}
switch (s_selectedRenderer)
{
case "Simple Marker Renderer":
MapUsingSimpleMarkerRenderer();
break;
case "Proportional Symbol Renderer":
MapUsingProportionalSymbolRenderer();
break;
case "Simple Fill Renderer":
MapUsingSimpleFillRenderer();
break;
case "Classbreaks Renderer":
MapUsingClassbreaksRenderer();
break;
}
}
private static void MapUsingProportionalSymbolRenderer()
{
ISimpleMarkerSymbol marker = new SimpleMarkerSymbol();
marker.Style = esriSimpleMarkerStyle.esriSMSCircle;
ICmykColor markerColor = ColorbrewerExtension.GetSingleCMYKColor();
marker.Size = 10;
marker.Color = markerColor;
IMxDocument mxDoc = ArcMap.Application.Document as IMxDocument;
IMap map = mxDoc.FocusMap;
string layerName = CboLayers.GetSelectedLayer();
ILayer layer = GetLayerByName(layerName);
IFeatureLayer fLayer = layer as IFeatureLayer;
IFeatureClass fClass = fLayer.FeatureClass as IFeatureClass;
IFeatureCursor cursor = fClass.Search(null, true);
IDataStatistics dataStats = new DataStatisticsClass();
dataStats.Cursor = cursor as ICursor;
string fieldName = CboFields.GetSelectedField();
dataStats.Field = fieldName;
IStatisticsResults statResult = dataStats.Statistics;
IProportionalSymbolRenderer propSymRenderer = new ProportionalSymbolRendererClass();
propSymRenderer.Field = fieldName;
propSymRenderer.MinDataValue = statResult.Minimum == 0.0 ? 1 : statResult.Minimum;
propSymRenderer.MaxDataValue = statResult.Maximum;
propSymRenderer.FlanneryCompensation = true;
propSymRenderer.ValueUnit = esriUnits.esriUnknownUnits;
propSymRenderer.MinSymbol = marker as ISymbol;
propSymRenderer.LegendSymbolCount = 3;
propSymRenderer.CreateLegendSymbols();
IGeoFeatureLayer gFLayer = layer as IGeoFeatureLayer;
gFLayer.Renderer = propSymRenderer as IFeatureRenderer;
mxDoc.ActiveView.Refresh();
mxDoc.ActiveView.PartialRefresh(esriViewDrawPhase.esriViewGeography, gFLayer
, mxDoc.ActiveView.Extent);
mxDoc.UpdateContents();
}
protected override void OnUpdate()
{
Enabled = CboFields.GetSelectedField() != null;
}
private static void MapUsingClassbreaksRenderer()
{
string layerName = CboLayers.GetSelectedLayer();
ILayer layer = GetLayerByName(layerName);
IFeatureLayer2 fLayer = layer as IFeatureLayer2;
string fieldName = CboFields.GetSelectedField();
// Get the number of classes
string selectedClass = CboClasses.GetSelectedClass();
int numberOfClasses = Convert.ToInt32(selectedClass);
ITableHistogram tableHistogram = new TableHistogramClass();
tableHistogram.Table = fLayer.FeatureClass as ITable;
tableHistogram.Field = fieldName;
IHistogram histo = tableHistogram as IHistogram;
object datavalues, datafrequencies;
histo.GetHistogram(out datavalues, out datafrequencies);
IClassify classify = new QuantileClass();
classify.SetHistogramData(datavalues, datafrequencies);
classify.Classify(ref numberOfClasses);
if (numberOfClasses <= 1)
{
return;
}
double[] classBreaks = (double[])classify.ClassBreaks;
IClassBreaksRenderer render = new ClassBreaksRenderer();
render.Field = fieldName;
render.BreakCount = numberOfClasses;
render.MinimumBreak = classBreaks[0];
// Get the colors
ICmykColor[] colors = ColorbrewerExtension.GetCmykColors();
IFillSymbol fill = null;
// Iterate through the colors
for (int i = 0; i < numberOfClasses; i++)
{
fill = new SimpleFillSymbol();
fill.Color = colors[i];
fill.Outline.Width = 0.5;
render.Symbol[i] = fill as ISymbol;
render.Break[i] = classBreaks[i + 1];
render.Label[i] = string.Format("{0} to {1}", classBreaks[i]
, classBreaks[i + 1]);
}
IGeoFeatureLayer gFLayer = layer as IGeoFeatureLayer;
gFLayer.Renderer = render as IFeatureRenderer;
IMxDocument mxDoc = ArcMap.Application.Document as IMxDocument;
mxDoc.ActiveView.PartialRefresh(esriViewDrawPhase.esriViewGeography, gFLayer
, mxDoc.ActiveView.Extent);
mxDoc.UpdateContents();
}