/// <summary>
/// Applies the Stretch colorizer to the basic raster layer.
/// </summary>
/// <param name="basicRasterLayer">The basic raster layer is either a raster or image service layer, or the image sub-layer of the mosaic layer.</param>
/// <returns></returns>
public static async Task SetToStretchColorizer(BasicRasterLayer basicRasterLayer)
{
// Defines parameters in colorizer definition.
int bandIndex = 0;
RasterStretchType stretchType = RasterStretchType.MinimumMaximum;
double gamma = 2.0;
string colorRampStyle = "ArcGIS Colors";
string colorRampName = "Aspect";
await QueuedTask.Run(async() =>
{
// Gets a color ramp from a style.
IList <ColorRampStyleItem> rampList = GetColorRampsFromStyleAsync(Project.Current, colorRampStyle, colorRampName);
CIMColorRamp colorRamp = rampList[0].ColorRamp;
// Creates a new Stretch Colorizer Definition with defined parameters.
StretchColorizerDefinition stretchColorizerDef = new StretchColorizerDefinition(bandIndex, stretchType, gamma, colorRamp);
// Creates a new stretch colorizer using the colorizer definition created above.
CIMRasterStretchColorizer newColorizer = await basicRasterLayer.CreateColorizerAsync(stretchColorizerDef) as CIMRasterStretchColorizer;
// Sets the newly created colorizer on the layer.
basicRasterLayer.SetColorizer(newColorizer);
});
}
/// <summary>
/// Warning! You must call this method on the MCT!
/// </summary>
/// <returns></returns>
private CIMRasterStretchColorizer CreateStretchRendererFromScratch(double min, double max)
{
//All of these methods have to be called on the MCT
if (Module1.OnUIThread)
{
throw new CalledOnWrongThreadException();
}
var colors = getColors();
var multiPartRamp = new CIMMultipartColorRamp
{
Weights = new double[colors.GetLength(0)]
};
CIMColorRamp[] rampValues = new CIMColorRamp[colors.GetLength(0)];
for (int i = 0; i < colors.GetLength(0) - 1; i++)
{
var ramp = new CIMPolarContinuousColorRamp();
var r = colors[i, 0];
var g = colors[i, 1];
var b = colors[i, 2];
ramp.FromColor = new CIMRGBColor()
{
R = r, G = g, B = b
};
r = colors[i + 1, 0];
g = colors[i + 1, 1];
b = colors[i + 1, 2];
ramp.ToColor = new CIMRGBColor()
{
R = r, G = g, B = b
};
ramp.PolarDirection = PolarDirection.Clockwise;
rampValues[i] = ramp;
multiPartRamp.Weights[i] = 1;
}
multiPartRamp.Weights[colors.GetLength(0) - 1] = 1;
multiPartRamp.ColorRamps = rampValues;
var colorizer = new CIMRasterStretchColorizer
{
ColorRamp = multiPartRamp,
StretchType = RasterStretchType.StandardDeviations,
StandardDeviationParam = 2,
// in order to see the label on the layer we must add at least three values
StretchClasses = new CIMRasterStretchClass[3]
};
colorizer.StretchClasses[0] = new CIMRasterStretchClass()
{
Value = min, Label = min.ToString()
};
colorizer.StretchClasses[1] = new CIMRasterStretchClass()
{
Value = max / 2
};
colorizer.StretchClasses[2] = new CIMRasterStretchClass()
{
Value = max, Label = max.ToString()
};
return(colorizer);
}
