public static IRasterRenderer CreateContinuousRenderer(Raster gRaster, IColorRamp pColorRamp, bool bInvert = false)
{
try
{
gRaster.ComputeStatistics();
Dictionary <string, decimal> stats = gRaster.GetStatistics();
double rMin = (double)stats["min"];
double rMax = (double)stats["max"];
RasterStretchColorRampRenderer stretchRenderer = new RasterStretchColorRampRenderer();
IRasterRenderer rasterRenderer = (IRasterRenderer)stretchRenderer;
IRasterDataset rasterDataset = ArcMapUtilities.GetRasterDataset(gRaster);
IRaster raster = rasterDataset.CreateDefaultRaster();
rasterRenderer.Raster = raster;
IRasterRendererColorRamp pRenderColorRamp = (IRasterRendererColorRamp)rasterRenderer;
pRenderColorRamp.ColorRamp = pColorRamp;
int iRound = GetMagnitude(rMin);
stretchRenderer.LabelHigh = Math.Round(rMax, Math.Abs(iRound)).ToString();
stretchRenderer.LabelLow = Math.Round(rMin, Math.Abs(iRound)).ToString();
if (bInvert)
{
IRasterStretch2 pStretch = (IRasterStretch2)stretchRenderer;
pStretch.Invert = true;
}
rasterRenderer.Update();
return(rasterRenderer);
}
catch (Exception ex)
{
System.Diagnostics.Debug.WriteLine(ex.Message);
return(null);
}
}
public static IRasterRenderer CreateDoDClassifyRenderer(Raster gRaster, int iClassCount, double rampRange)
{
try
{
// Open file raster dataset and ensure that statistics and histograms are present (absence of histograms will cause Renderer.Update() to crash)
IRasterDataset rasterDataset = ArcMapUtilities.GetRasterDataset(gRaster);
ESRI.ArcGIS.DataSourcesRaster.IRasterBandCollection pRastBands = (ESRI.ArcGIS.DataSourcesRaster.IRasterBandCollection)rasterDataset;
ESRI.ArcGIS.DataSourcesRaster.IEnumRasterBand enumRasterBand = (ESRI.ArcGIS.DataSourcesRaster.IEnumRasterBand)pRastBands.Bands;
rasterDataset.PrecalculateStats(0);
ESRI.ArcGIS.DataSourcesRaster.IRasterBand pRastBand = enumRasterBand.Next();
pRastBand.ComputeStatsAndHist();
IRasterClassifyColorRampRenderer classifyRenderer = new RasterClassifyColorRampRendererClass();
IRasterRenderer rasterRenderer = (IRasterRenderer)classifyRenderer;
IFillSymbol fillSymbol = new SimpleFillSymbolClass();
IRaster raster = rasterDataset.CreateDefaultRaster();
double rMin = -2.5;
double rMax = 2.5;
if (rampRange == 0)
{
gRaster.ComputeStatistics();
Dictionary <string, decimal> rasterStats = gRaster.GetStatistics();
rMin = (double)rasterStats["min"];
rMax = (double)rasterStats["max"];
}
else
{
rMin = rampRange * -1;
rMax = rampRange;
}
rasterRenderer.Raster = raster;
if ((rMin == double.MinValue & rMax == double.MaxValue) | (rMin == double.MaxValue & rMax == double.MinValue) | (rMin == float.MinValue & rMax == float.MaxValue) | (rMin == float.MaxValue & rMax == float.MinValue))
{
classifyRenderer.ClassCount = 1;
ESRI.ArcGIS.Display.IRgbColor rgbColor = CreateRGBColor(255, 255, 255);
rgbColor.Transparency = 0;
fillSymbol.Color = rgbColor;
classifyRenderer.Symbol[0] = (ISymbol)fillSymbol;
classifyRenderer.Label[0] = "No Data (no change detected)";
return(rasterRenderer);
}
classifyRenderer.ClassCount = iClassCount;
rasterRenderer.Update();
CreateDoDClassBreaks(rMax, rMin, iClassCount, ref classifyRenderer);
List <IColor> lColors = CreateDoDColorRamp();
for (int i = 0; i < classifyRenderer.ClassCount; i++)
{
fillSymbol.Color = lColors[i];
classifyRenderer.Symbol[i] = (ISymbol)fillSymbol;
}
return(rasterRenderer);
}
catch (Exception ex)
{
System.Diagnostics.Debug.WriteLine(ex.Message);
return(null);
}
}
