/// <summary>
/// Set the stretch type on the first selected image service layer in the first open 2D map.
/// </summary>
/// <param name="stretschType">The stretch type to set on the layer.</param>
/// <param name="statsType">The stretch statistics type to set on the layer. This lets you pick between Dataset, Area of View (to enable DRA) or Custom statistics.</param>
/// <returns></returns>
public static async Task SetStretchTypeAsync(RasterStretchType stretschType, RasterStretchStatsType statsType = RasterStretchStatsType.Dataset)
{
try
{
// Get the first 2D map from the project that is called Map.
Map _map = await GetMapFromProject(Project.Current, "Map");
if (_map == null)
{
ArcGIS.Desktop.Framework.Dialogs.MessageBox.Show("SetStretchType: Failed to get map.");
return;
}
// Get the most recently selected layer.
Layer firstSelectedLayer = MapView.Active.GetSelectedLayers().First();
// Check if the first selected layer is an image service layer.
if (firstSelectedLayer is ImageServiceLayer)
{
// Set the colorizer on the most recently selected layer.
// The colorizer has to be set on the Main CIM Thread (MCT).
await QueuedTask.Run(() =>
{
// Get the colorizer from the selected layer.
CIMRasterColorizer newColorizer = ((BasicRasterLayer)firstSelectedLayer).GetColorizer();
// Set the stretch type and stretch statistics type on the colorizer.
// Theese parameters only apply to the Stretch and RGB colorizers.
if (newColorizer is CIMRasterRGBColorizer)
{
((CIMRasterRGBColorizer)newColorizer).StretchType = stretschType;
((CIMRasterRGBColorizer)newColorizer).StretchStatsType = statsType;
}
else if (newColorizer is CIMRasterStretchColorizer)
{
((CIMRasterStretchColorizer)newColorizer).StretchType = stretschType;
((CIMRasterStretchColorizer)newColorizer).StatsType = statsType;
}
else
{
MessageBox.Show("Selected layer must be visualized using the RGB or Stretch colorizer");
}
// Update the image service with the new colorizer
((BasicRasterLayer)firstSelectedLayer).SetColorizer(newColorizer);
});
}
}
catch (Exception exc)
{
// Catch any exception found and display a message box.
ArcGIS.Desktop.Framework.Dialogs.MessageBox.Show("Exception caught while trying to set stretch type: " + exc.Message);
return;
}
}
// This method addresses the issue that the CreateColorizer does not systematically assign colors
// from the associated color ramp.
// https://community.esri.com/message/867870-re-creating-unique-value-colorizer-for-raster
public static CIMRasterColorizer RecalculateColorizer(CIMRasterColorizer colorizer)
{
if (colorizer is CIMRasterUniqueValueColorizer uvrColorizer)
{
var colorRamp = uvrColorizer.ColorRamp;
if (colorRamp == null)
{
throw new InvalidOperationException("Colorizer must have a color ramp");
}
//get the total number of colors to be assigned
var total_colors = uvrColorizer.Groups.Select(g => g.Classes.Count()).Sum();
var colors = ColorFactory.Instance.GenerateColorsFromColorRamp(colorRamp, total_colors);
var c = 0;
foreach (var uvr_group in uvrColorizer.Groups)
{
foreach (var uvr_class in uvr_group.Classes)
{
//assign the generated colors to each class in turn
uvr_class.Color = colors[c++];
}
}
}
else if (colorizer is CIMRasterClassifyColorizer classColorizer)
{
var colorRamp = classColorizer.ColorRamp;
if (colorRamp == null)
{
throw new InvalidOperationException("Colorizer must have a color ramp");
}
var total_colors = classColorizer.ClassBreaks.Count();
var colors = ColorFactory.Instance.GenerateColorsFromColorRamp(colorRamp, total_colors);
var c = 0;
foreach (var cbreak in classColorizer.ClassBreaks)
{
//assign the generated colors to each class break in turn
cbreak.Color = colors[c++];
}
}
return(colorizer);
}
/// <summary>
/// Set the resampling type on the first selected image service layer in the first open 2D map.
/// </summary>
/// <param name="resamplingType">The resampling type to set on the layer.</param>
/// <returns></returns>
public static async Task SetResamplingTypeAsync(RasterResamplingType resamplingType)
{
try
{
// Get the first 2D map from the project that is called Map.
Map _map = await GetMapFromProject(Project.Current, "Map");
if (_map == null)
{
ArcGIS.Desktop.Framework.Dialogs.MessageBox.Show("SetResamplingType: Failed to get map.");
return;
}
// Get the most recently selected layer.
Layer firstSelectedLayer = MapView.Active.GetSelectedLayers().First();
// Check if the first selected layer is an image service layer.
if (firstSelectedLayer is ImageServiceLayer)
{
// Set the colorizer on the most recently selected layer.
// The colorizer has to be get/set on the Main CIM Thread (MCT).
await QueuedTask.Run(() =>
{
// Get the colorizer from the selected layer.
CIMRasterColorizer newColorizer = ((BasicRasterLayer)firstSelectedLayer).GetColorizer();
// Set the resampling type on the colorizer.
newColorizer.ResamplingType = resamplingType;
// Update the image service with the new colorizer
((BasicRasterLayer)firstSelectedLayer).SetColorizer(newColorizer);
});
}
}
catch (Exception exc)
{
// Catch any exception found and display a message box.
ArcGIS.Desktop.Framework.Dialogs.MessageBox.Show("Exception caught while trying to set resampling type: " + exc.Message);
return;
}
}
private static CIMRasterColorizer RecalculateColorizer(RasterLayer rasterLayer, CIMRasterColorizer colorizer, string fieldName)
{
// fix up colorizer ... turns out the values are wrong ... the landuse value is always inserted
// we use the Raster's attribute table to collect a dictionary with the correct replacement values
Dictionary <string, string> landuseToFieldValue = new Dictionary <string, string>();
if (colorizer is CIMRasterUniqueValueColorizer uvrColorizer)
{
var rasterTbl = rasterLayer.GetRaster().GetAttributeTable();
var cursor = rasterTbl.Search();
while (cursor.MoveNext())
{
var row = cursor.Current;
var correctField = row[fieldName].ToString();
var key = row[uvrColorizer.Groups[0].Heading].ToString();
landuseToFieldValue.Add(key, correctField);
}
uvrColorizer.Groups[0].Heading = fieldName;
for (var idxGrp = 0; idxGrp < uvrColorizer.Groups[0].Classes.Length; idxGrp++)
{
var grpClass = uvrColorizer.Groups[0].Classes[idxGrp];
var oldValue = grpClass.Values[0];
var correctValue = landuseToFieldValue[oldValue];
grpClass.Values[0] = correctValue;
grpClass.Label = $@"{correctValue}";
}
}
return(colorizer);
}
