private void ChangeStrechRender(IRasterLayer rasterLayer /*, double dbMaxValue, double dbMinValue*/)
{
IRaster pRaster = rasterLayer.Raster;
IRasterBandCollection pRasterBandCollection = pRaster as IRasterBandCollection;
IRasterBand pRasterBand = pRasterBandCollection.Item(0);
if (pRasterBand == null)
{
return;
}
bool bFlag = false;
pRasterBand.HasStatistics(out bFlag);
if (!bFlag)
{
pRasterBand.ComputeStatsAndHist();
}
double dbMaxValue = double.NaN;
double dbMinValue = double.NaN;
IRasterStatistics pStaticts = pRasterBand.Statistics;
dbMaxValue = pStaticts.Maximum;
dbMinValue = pStaticts.Minimum;
//设置最大最小渲染方式
IRasterStretch pRasterStretch = new RasterStretchColorRampRendererClass();
IRasterStretchMinMax pRasterStretchMinMax = pRasterStretch as IRasterStretchMinMax;
pRasterStretchMinMax.UseCustomStretchMinMax = true;
pRasterStretchMinMax.CustomStretchMin = dbMinValue;
pRasterStretchMinMax.CustomStretchMax = dbMaxValue;
pRasterStretch.StretchType = esriRasterStretchTypesEnum.esriRasterStretch_MinimumMaximum;
//update
IRasterStretchColorRampRenderer pStretchColorRasterRenderer = (IRasterStretchColorRampRenderer)pRasterStretch;;
IRasterRenderer pRasterRenderer = pStretchColorRasterRenderer as IRasterRenderer;
pRasterRenderer.Raster = rasterLayer.Raster;
pRasterLayer.Renderer = pStretchColorRasterRenderer as IRasterRenderer;
pRasterRenderer.Update();
}
/// <summary>
/// Ge the render color of the input layer rendering with stretched color ramp.
/// </summary>
/// <param name="layer">Input raster layer</param>
/// <param name="value">Pixel value</param>
/// <returns></returns>
private static IColor GetRenderColor_Stretched(ILayer layer, double value)
{
IRasterLayer rasterLayer = (IRasterLayer)layer;
// Check whether the value is NoData value
IRasterProps rasterProps = (IRasterProps)rasterLayer.Raster;
System.Array noDataValue = (System.Array)rasterProps.NoDataValue;
if ((rasterProps.NoDataValue != null) && (Convert.ToDouble(noDataValue.GetValue(0)) == value))
{
return(null);
}
IRasterRendererColorRamp colorRamp = (IRasterRendererColorRamp)rasterLayer.Renderer;
IRasterStretchMinMax stretchMinMax = (IRasterStretchMinMax)rasterLayer.Renderer;
double min = 0;
double max = 0;
if (stretchMinMax.UseCustomStretchMinMax)
{
min = stretchMinMax.CustomStretchMin;
max = stretchMinMax.CustomStretchMax;
}
else
{
min = stretchMinMax.StretchMin;
max = stretchMinMax.StretchMax;
}
if (value >= max)
{
return(colorRamp.ColorRamp.Color[255]);
}
if (value <= min)
{
return(colorRamp.ColorRamp.Color[0]);
}
return(colorRamp.ColorRamp.Color[Convert.ToInt32(System.Math.Round(255 * (value - min)))]);
}
public static IRasterRenderer CreateESRIDefinedContinuousRenderer(GCDConsoleLib.Raster gRaster, int iClassCount, string sColorRampName, bool bInvert = false)
{
try
{
gRaster.ComputeStatistics();
decimal maxValue = gRaster.GetStatistics()["max"];
int iRound = GetMagnitude(maxValue);
double maxValueRounded = Math.Round((double)maxValue, Math.Abs(iRound));
RasterStretchColorRampRenderer stretchRenderer = new RasterStretchColorRampRendererClass();
IRasterRenderer rasterRenderer = (IRasterRenderer)stretchRenderer;
IRasterDataset rasterDataset = ArcMapUtilities.GetRasterDataset(gRaster);
IRaster raster = rasterDataset.CreateDefaultRaster();
rasterRenderer.Raster = raster;
IColorRamp pColorRamp = null;
IStyleGalleryItem pStyleItem = GetESRIStyleColorRamp(out pColorRamp, sColorRampName);
IRasterRendererColorRamp pRenderColorRamp = (IRasterRendererColorRamp)rasterRenderer;
pRenderColorRamp.ColorScheme = pStyleItem.Name;
IRasterStretchMinMax pStretchInfo = (IRasterStretchMinMax)stretchRenderer;
pStretchInfo.CustomStretchMin = 0;
pStretchInfo.CustomStretchMax = maxValueRounded;
pStretchInfo.UseCustomStretchMinMax = true;
stretchRenderer.LabelHigh = maxValueRounded.ToString();
stretchRenderer.LabelLow = "0.0";
if (bInvert)
{
IRasterStretch2 pStretch = (IRasterStretch2)stretchRenderer;
pStretch.Invert = true;
}
rasterRenderer.Update();
return(rasterRenderer);
}
catch (Exception ex)
{
System.Diagnostics.Debug.WriteLine(ex.Message);
return(null);
}
}
private void btnuse_Click(object sender, EventArgs e)
{
if (treeshow.SelectedIndex == 1)
{
IRasterRGBRenderer2 pRRGBRenderUse = new RasterRGBRendererClass();
if ((bool)gridsymbol.Rows[0].Cells[0].Value == true)
{
pRRGBRenderUse.UseRedBand = true;
}
else
{
pRRGBRenderUse.UseRedBand = false;
}
if ((bool)gridsymbol.Rows[1].Cells[0].Value == true)
{
pRRGBRenderUse.UseGreenBand = true;
}
else
{
pRRGBRenderUse.UseGreenBand = false;
}
if ((bool)gridsymbol.Rows[2].Cells[0].Value == true)
{
pRRGBRenderUse.UseBlueBand = true;
}
else
{
pRRGBRenderUse.UseBlueBand = false;
}
if ((bool)gridsymbol.Rows[3].Cells[0].Value == true)
{
pRRGBRenderUse.UseAlphaBand = true;
}
else
{
pRRGBRenderUse.UseAlphaBand = false;
}
pRRGBRenderUse.RedBandIndex = cmbred.SelectedIndex;
pRRGBRenderUse.GreenBandIndex = cmbgreen.SelectedIndex;
pRRGBRenderUse.BlueBandIndex = cmbblue.SelectedIndex;
pRRGBRenderUse.AlphaBandIndex = cmbalpha.SelectedIndex;
pRLayer.Renderer = (IRasterRenderer)pRRGBRenderUse;
}
else
{
if (pRStretch.StretchType == esriRasterStretchTypesEnum.esriRasterStretch_MinimumMaximum)
{
if (txtmin.Text == "" && txtmax.Text != "")
{
MessageBox.Show("请设置拉伸的最小值", "提示", MessageBoxButtons.OK);
}
else if (txtmax.Text == "" && txtmin.Text != "")
{
MessageBox.Show("请设置拉伸的最大值", "提示", MessageBoxButtons.OK);
}
else if (txtmax.Text == "" && txtmin.Text == "")
{
MessageBox.Show("请设置拉伸的最大值以及最小值", "提示", MessageBoxButtons.OK);
}
else
{
pRasterStretchMinMax = (IRasterStretchMinMax)pRStretch;
pRasterStretchMinMax.UseCustomStretchMinMax = true;
pRasterStretchMinMax.CustomStretchMin = double.Parse(txtmin.Text);
pRasterStretchMinMax.CustomStretchMax = double.Parse(txtmax.Text);
pRStretch = (IRasterStretch)pRasterStretchMinMax;
pRStretch.StretchType = esriRasterStretchTypesEnum.esriRasterStretch_MinimumMaximum;
}
}
if (chkdisplay.Checked == true)
{
pRStretch.Background = true;
pRStretch.BackgroundColor = ClsGDBDataCommon.ColorToIColor(colbackg.SelectedColor);
pRStretch.set_BackgroundValues(Convert.ToDouble(backvalue.Text));
}
else
{
pRStretch.Background = false;
}
IRasterStretchColorRampRenderer pStretchColorRasterRenderer = (IRasterStretchColorRampRenderer)pRStretch;;
IRasterRenderer pRasterRenderer = pStretchColorRasterRenderer as IRasterRenderer;
pRasterRenderer.Raster = pRLayer.Raster;
pRasterRenderer.Update();
pStretchColorRasterRenderer.BandIndex = cmbBand.SelectedIndex;
pStretchColorRasterRenderer.ColorRamp = PColorramp as IColorRamp;
pRasterRenderer.Update();
pRLayer.Renderer = pStretchColorRasterRenderer as IRasterRenderer;
}
if (pTocContral.Buddy == pMapContral.Object)
{
pTocContral.SetBuddyControl(pMapContral);
pMapContral.ActiveView.PartialRefresh(esriViewDrawPhase.esriViewGeography, null, null);
pTocContral.ActiveView.PartialRefresh(esriViewDrawPhase.esriViewGeography, null, null);
}
else if (pTocContral.Buddy.Equals(pSceneControl.Object))
{
pTocContral.SetBuddyControl(pSceneControl);
IActiveView pActiveView = pSceneControl.Scene as IActiveView;
pActiveView.PartialRefresh(esriViewDrawPhase.esriViewGeography, pRLayer, null);
pTocContral.ActiveView.PartialRefresh(esriViewDrawPhase.esriViewGeography, null, null);
}
}
