/// <summary>
/// 根据单波段拉伸渲染
/// </summary>
/// <param name="rasterDataset">栅格数据集</param>
/// <param name="graypos">第几波段</param>
/// <param name="stretchType">拉伸方式</param>
/// <param name="pFromColor">fromColor</param>
/// <param name="pToColor">toColor</param>
/// <returns></returns>
public static IRasterRenderer StretchRenderer(ESRI.ArcGIS.Geodatabase.IRasterDataset rasterDataset, int graypos,
esriRasterStretchTypesEnum stretchType, IRgbColor pFromColor, IRgbColor pToColor)
{
try
{
//Create the color ramp.
IAlgorithmicColorRamp colorRamp = new AlgorithmicColorRampClass();
colorRamp.Size = 255;
colorRamp.FromColor = pFromColor;
colorRamp.ToColor = pToColor;
bool createColorRamp;
colorRamp.CreateRamp(out createColorRamp);
//Create a stretch renderer.
IRasterStretchColorRampRenderer stretchRenderer = new
RasterStretchColorRampRendererClass();
IRasterRenderer rasterRenderer = (IRasterRenderer)stretchRenderer;
//Set the renderer properties.
IRaster raster = rasterDataset.CreateDefaultRaster();
rasterRenderer.Raster = raster;
rasterRenderer.Update();
stretchRenderer.BandIndex = graypos;
stretchRenderer.ColorRamp = colorRamp;
//Set the stretch type.
IRasterStretch pRasterStretch = (IRasterStretch)rasterRenderer;
pRasterStretch.StretchType = stretchType;
pRasterStretch.StandardDeviationsParam = 2;
return(rasterRenderer);
}
catch
{
return(null);
}
}
/// <summary>
/// 拉伸渲染模式（貌似）
/// </summary>
/// <param name="rasterDataset"></param>
/// <returns></returns>
private static IRasterRenderer StretchRenderer(ESRI.ArcGIS.Geodatabase.IRasterDataset rasterDataset, int graypos, int i)
{
try
{
//Define the from and to colors for the color ramp.
IRgbColor fromColor = new RgbColorClass();
fromColor.Red = 255;
fromColor.Green = 0;
fromColor.Blue = 0;
IColor toColor = new RgbColorClass();
//此处应该是写错了
fromColor.Red = 0;
fromColor.Green = 255;
fromColor.Blue = 0;
//Create the color ramp.
IAlgorithmicColorRamp colorRamp = new AlgorithmicColorRampClass();
colorRamp.Size = 255;
colorRamp.FromColor = fromColor;
colorRamp.ToColor = toColor;
bool createColorRamp;
colorRamp.CreateRamp(out createColorRamp);
//Create a stretch renderer.
IRasterStretchColorRampRenderer stretchRenderer = new
RasterStretchColorRampRendererClass();
//设置显示对比度和亮度
//((IRasterDisplayProps)stretchRenderer).BrightnessValue = -90;
IRasterRenderer rasterRenderer = (IRasterRenderer)stretchRenderer;
//Set the renderer properties.
IRaster raster = rasterDataset.CreateDefaultRaster();
rasterRenderer.Raster = raster;
rasterRenderer.Update();
stretchRenderer.BandIndex = graypos;
//stretchRenderer.ColorRamp = colorRamp;
//Set the stretch type.
IRasterStretch stretchType = (IRasterStretch)rasterRenderer;
stretchType.StretchType = esriRasterStretchTypesEnum.esriRasterStretch_StandardDeviations;
stretchType.StandardDeviationsParam = 2;
return(rasterRenderer);
}
catch
{
return(null);
}
}
public static IRasterRenderer ClassifyRenderer(ESRI.ArcGIS.Geodatabase.IRasterDataset pRasterDataset)
{
try
{
//create the classify render:创建渲染器
IRasterClassifyColorRampRenderer pClassifyRenderer = new RasterClassifyColorRampRendererClass();
IRasterRenderer pRasterRenderer = (IRasterRenderer)pClassifyRenderer;
IRaster pRaster = pRasterDataset.CreateDefaultRaster();
pRasterRenderer.Raster = pRaster;
pClassifyRenderer.ClassCount = 10;
pRasterRenderer.Update();
//创建颜色
IRgbColor pFromColor = new RgbColorClass();
pFromColor.Red = 255;
pFromColor.Green = 0;
pFromColor.Blue = 0;
IRgbColor pToColor = new RgbColorClass();
pToColor.Red = 0;
pToColor.Green = 255;
pToColor.Blue = 255;
//set the color ramp for the symbology:生成色带
IAlgorithmicColorRamp pRamp = new AlgorithmicColorRampClass();
pRamp.Size = 10;
pRamp.FromColor = pFromColor;
pRamp.ToColor = pToColor;
bool pBoolColorRamp;
pRamp.CreateRamp(out pBoolColorRamp);
//create the symbol for the classes.:创建符号
IFillSymbol pFillSymbol = new SimpleFillSymbolClass();
for (int i = 0; i < pClassifyRenderer.ClassCount; i++)
{
pFillSymbol.Color = pRamp.get_Color(i);
pClassifyRenderer.set_Symbol(i, (ISymbol)pFillSymbol);
pClassifyRenderer.set_Label(i, Convert.ToString(i));
}
return(pRasterRenderer);
}
catch (System.Exception ex)
{
System.Diagnostics.Debug.WriteLine(ex.Message);
return(null);
}
}
public ESRI.ArcGIS.Carto.IRasterRenderer Pick(ESRI.ArcGIS.esriSystem.IArray pRenderers, ESRI.ArcGIS.Geodatabase.IRasterDataset pRasterDataset)
{
IRasterRenderer rasterRenderer = null;
IRasterRGBRenderer rasterRGBRenderer = null;
IRasterStretchColorRampRenderer rasterStretchColorRampRenderer = null;
// Get the renderers
int Count = pRenderers.Count;
int i = 0;
for (i = 0; i < Count; i++)
{
rasterRenderer = (IRasterRenderer)(pRenderers.get_Element(i));
if (rasterRenderer is IRasterStretchColorRampRenderer)
{
rasterStretchColorRampRenderer = (IRasterStretchColorRampRenderer)rasterRenderer;
}
else if (rasterRenderer is IRasterRGBRenderer)
{
rasterRGBRenderer = (IRasterRGBRenderer)rasterRenderer;
}
}
IRasterDataset2 rasterDataset2 = (IRasterDataset2)pRasterDataset;
IRasterBandCollection rasterBandCollection = (IRasterBandCollection)rasterDataset2;
if (rasterBandCollection.Count > 5)
{
// Use band 4,5 and 3 as red, green and blue
rasterRenderer = (IRasterRenderer)rasterRGBRenderer;
rasterRGBRenderer.SetBandIndices(3, 4, 2);
return((IRasterRenderer)rasterRGBRenderer);
}
else // Special stretch
{
IRasterBand rasterBand = rasterBandCollection.Item(0);
bool hasTable = false;
rasterBand.HasTable(out hasTable);
if (hasTable == false)
{
// Simply change the color ramp for the stretch renderer
//IColor fromColor = new RgbColorClass();
//fromColor.RGB = Microsoft.VisualBasic.Information.RGB(255, 200, 50);
IColor fromColor = CreateRGBColor(255, 200, 50) as IColor;
//IColor toColor = new RgbColorClass();
//toColor.RGB = Microsoft.VisualBasic.Information.RGB(180, 125, 0);
IColor toColor = CreateRGBColor(180, 125, 0) as IColor;
// Create color ramp
IAlgorithmicColorRamp algorithmicColorRamp = new AlgorithmicColorRampClass();
algorithmicColorRamp.Size = 255;
algorithmicColorRamp.FromColor = fromColor;
algorithmicColorRamp.ToColor = toColor;
bool createRamp = false;
algorithmicColorRamp.CreateRamp(out createRamp);
if (createRamp == true)
{
rasterRenderer = (IRasterRenderer)rasterStretchColorRampRenderer;
rasterStretchColorRampRenderer.BandIndex = 0;
rasterStretchColorRampRenderer.ColorRamp = algorithmicColorRamp;
return((IRasterRenderer)rasterStretchColorRampRenderer);
}
}
}
return(rasterRenderer);
}