Stretch renderer

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 // Copyright 2018 Esri. // // Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. // You may obtain a copy of the License at: http://www.apache.org/licenses/LICENSE-2.0 // // Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an // "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific // language governing permissions and limitations under the License.  using ArcGIS.Samples.Managers; using Esri.ArcGISRuntime.Mapping; using Esri.ArcGISRuntime.Rasters; using System; using System.Collections.Generic; using System.Threading.Tasks; using System.Windows;  namespace ArcGIS.WPF.Samples.ChangeStretchRenderer {  [ArcGIS.Samples.Shared.Attributes.Sample(  name: "Stretch renderer",  category: "Layers",  description: "Use a stretch renderer to enhance the visual contrast of raster data for analysis.",  instructions: "Choose one of the stretch parameter types:",  tags: new[] { "analysis", "deviation", "histogram", "imagery", "interpretation", "min-max", "percent clip", "pixel", "raster", "stretch", "symbology", "visualization" })]  [ArcGIS.Samples.Shared.Attributes.OfflineData("95392f99970d4a71bd25951beb34a508")]  public partial class ChangeStretchRenderer  {  public ChangeStretchRenderer()  {  InitializeComponent();   // Create the UI, setup the control references and execute initialization  _ = Initialize();  }   private async Task Initialize()  {  // Initialize the GUI controls appearance  RendererTypes.Items.Add("Min Max");  RendererTypes.Items.Add("Percent Clip");  RendererTypes.Items.Add("Standard Deviation");  RendererTypes.SelectedIndex = 0;   // Add an imagery basemap  MyMapView.Map = new Map(BasemapStyle.ArcGISImageryStandard);   // Get the file name  string filepath = GetRasterPath();   // Load the raster file  Raster myRasterFile = new Raster(filepath);   // Create the layer  RasterLayer myRasterLayer = new RasterLayer(myRasterFile);   // Add the layer to the map  MyMapView.Map.OperationalLayers.Add(myRasterLayer);   try  {  // Wait for the layer to load  await myRasterLayer.LoadAsync();   // Set the viewpoint  await MyMapView.SetViewpointGeometryAsync(myRasterLayer.FullExtent);  }  catch (Exception e)  {  MessageBox.Show(e.ToString(), "Error");  }  }   private void OnUpdateRendererClicked(object sender, RoutedEventArgs e)  {  // Convert the text to doubles and return if they're invalid.  double input1;  double input2;  try  {  input1 = Convert.ToDouble(FirstParameterInput.Text);  input2 = Convert.ToDouble(SecondParameterInput.Text);  }  catch (Exception ex)  {  MessageBox.Show(ex.Message);  return;  }   // Get the user choice for the raster stretch render  string myRendererTypeChoice = RendererTypes.SelectedValue.ToString();   // Create an IEnumerable from an empty list of doubles for the gamma values in the stretch render  IEnumerable<double> myGammaValues = new List<double>();   // Create a color ramp for the stretch renderer  ColorRamp myColorRamp = ColorRamp.Create(PresetColorRampType.DemLight, 1000);   // Create the place holder for the stretch renderer  StretchRenderer myStretchRenderer = null;   switch (myRendererTypeChoice)  {  case "Min Max":   // This section creates a stretch renderer based on a MinMaxStretchParameters  // TODO: Add you own logic to ensure that accurate min/max stretch values are used   // Create an IEnumerable from a list of double min stretch value doubles  IEnumerable<double> myMinValues = new List<double> { input1 };   // Create an IEnumerable from a list of double max stretch value doubles  IEnumerable<double> myMaxValues = new List<double> { input2 };   // Create a new MinMaxStretchParameters based on the user choice for min and max stretch values  MinMaxStretchParameters myMinMaxStretchParameters = new MinMaxStretchParameters(myMinValues, myMaxValues);   // Create the stretch renderer based on the user defined min/max stretch values, empty gamma values, statistic estimates, and a predefined color ramp  myStretchRenderer = new StretchRenderer(myMinMaxStretchParameters, myGammaValues, true, myColorRamp);   break;   case "Percent Clip":   // This section creates a stretch renderer based on a PercentClipStretchParameters  // TODO: Add you own logic to ensure that accurate min/max percent clip values are used   // Create a new PercentClipStretchParameters based on the user choice for min and max percent clip values  PercentClipStretchParameters myPercentClipStretchParameters = new PercentClipStretchParameters(input1, input2);   // Create the percent clip renderer based on the user defined min/max percent clip values, empty gamma values, statistic estimates, and a predefined color ramp  myStretchRenderer = new StretchRenderer(myPercentClipStretchParameters, myGammaValues, true, myColorRamp);   break;   case "Standard Deviation":   // This section creates a stretch renderer based on a StandardDeviationStretchParameters  // TODO: Add you own logic to ensure that an accurate standard deviation value is used   // Create a new StandardDeviationStretchParameters based on the user choice for standard deviation value  StandardDeviationStretchParameters myStandardDeviationStretchParameters = new StandardDeviationStretchParameters(input1);   // Create the standard deviation renderer based on the user defined standard deviation value, empty gamma values, statistic estimates, and a predefined color ramp  myStretchRenderer = new StretchRenderer(myStandardDeviationStretchParameters, myGammaValues, true, myColorRamp);   break;  }   // Get the existing raster layer in the map  RasterLayer myRasterLayer = (RasterLayer)MyMapView.Map.OperationalLayers[0];   // Apply the stretch renderer to the raster layer  myRasterLayer.Renderer = myStretchRenderer;  }   private void RendererTypes_SelectionChanged(object sender, System.Windows.Controls.SelectionChangedEventArgs e)  {  // Get the user choice for the raster stretch render  string myRendererTypeChoice = e.AddedItems[0].ToString();   switch (myRendererTypeChoice)  {  case "Min Max":   // This section displays/resets the user choice options for MinMaxStretchParameters   // Make sure all the GUI items are visible  FirstParameterLabel.Visibility = Visibility.Visible;  SecondParameterLabel.Visibility = Visibility.Visible;  FirstParameterInput.Visibility = Visibility.Visible;  SecondParameterInput.Visibility = Visibility.Visible;   // Define what values/options the user sees  FirstParameterLabel.Text = "Minimum value (0 - 255):";  SecondParameterLabel.Text = "Maximum value (0 - 255):";  FirstParameterInput.Text = "10";  SecondParameterInput.Text = "150";   break;   case "Percent Clip":   // This section displays/resets the user choice options for PercentClipStretchParameters   // Make sure all the GUI items are visible  FirstParameterLabel.Visibility = Visibility.Visible;  SecondParameterLabel.Visibility = Visibility.Visible;  FirstParameterInput.Visibility = Visibility.Visible;  SecondParameterInput.Visibility = Visibility.Visible;   // Define what values/options the user sees  FirstParameterLabel.Text = "Minimum (0 - 100):";  SecondParameterLabel.Text = "Maximum (0 - 100)";  FirstParameterInput.Text = "0";  SecondParameterInput.Text = "50";   break;   case "Standard Deviation":   // This section displays/resets the user choice options for StandardDeviationStretchParameters   // Make sure that only the necessary GUI items are visible  FirstParameterLabel.Visibility = Visibility.Visible;  SecondParameterLabel.Visibility = Visibility.Collapsed;  FirstParameterInput.Visibility = Visibility.Visible;  SecondParameterInput.Visibility = Visibility.Collapsed;   // Define what values/options the user sees  FirstParameterLabel.Text = "Factor (.25 to 4):";  FirstParameterInput.Text = "0.5";   break;  }  }   private static string GetRasterPath()  {  return DataManager.GetDataFolder("95392f99970d4a71bd25951beb34a508", "shasta", "ShastaBW.tif");  }  } }