private void OnUpdateRendererClicked(object sender, EventArgs e)
{
// This function acquires the user selection of the stretch renderer from the table view
// along with the parameters specified, then a stretch renderer is created and applied to
// the raster layer
// Get the user choice for the raster stretch render
UITableViewSource myUITableViewSource = _myRenderChoiceType.Source;
TableSource myTableSource = (TableSource)myUITableViewSource;
string myRendererTypeChoice;
if (myTableSource.SelectedValue == null)
{
// If the user does not click on a choice in the table but just clicks the
// button, the selected value will be null so use the initial
// stretch renderer option
myRendererTypeChoice = "Min Max";
}
else
{
// The user clicked on an option in the table and thus the selected value
// will contain a valid choice
myRendererTypeChoice = myTableSource.SelectedValue;
}
// 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> {
Convert.ToDouble(_Input_Parameter1.Text)
};
// Create an IEnumerable from a list of double max stretch value doubles
IEnumerable <double> myMaxValues = new List <double> {
Convert.ToDouble(_Input_Parameter2.Text)
};
// 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(Convert.ToDouble(_Input_Parameter1.Text), Convert.ToDouble(_Input_Parameter2.Text));
// 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(Convert.ToDouble(_Input_Parameter1.Text));
// 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;
}
public void RenderChoiceSelectionChanged(int selectedIndex)
{
// This function modifies the UI parameter controls depending on which stretch
// renderer is chosen by the user when clicking the table view
// Get the user choice for the raster stretch render
UITableViewSource myUITableViewSource = _myRenderChoiceType.Source;
TableSource myTableSource = (TableSource)myUITableViewSource;
string myRendererTypeChoice = myTableSource.TableItems[selectedIndex];
switch (myRendererTypeChoice)
{
case "Min Max":
// This section displays/resets the user choice options for MinMaxStretchParameters
// Make sure all the GUI items are visible
_Label_Parameter1.Hidden = false;
_Label_Parameter2.Hidden = false;
_Input_Parameter1.Hidden = false;
_Input_Parameter2.Hidden = false;
// Define what values/options the user sees
_Label_Parameter1.Text = "Minimum value (0 - 255):";
_Label_Parameter2.Text = "Maximum value (0 - 255):";
_Input_Parameter1.Text = "10";
_Input_Parameter2.Text = "150";
break;
case "Percent Clip":
// This section displays/resets the user choice options for PercentClipStretchParameters
// Make sure all the GUI items are visible
_Label_Parameter1.Hidden = false;
_Label_Parameter2.Hidden = false;
_Input_Parameter1.Hidden = false;
_Input_Parameter2.Hidden = false;
// Define what values/options the user sees
_Label_Parameter1.Text = "Minimum (0 - 100):";
_Label_Parameter2.Text = "Maximum (0 - 100)";
_Input_Parameter1.Text = "0";
_Input_Parameter2.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
_Label_Parameter1.Hidden = false;
_Label_Parameter2.Hidden = true;
_Input_Parameter1.Hidden = false;
_Input_Parameter2.Hidden = true;
// Define what values/options the user sees
_Label_Parameter1.Text = "Factor (.25 to 4):";
_Input_Parameter1.Text = "0.5";
break;
}
}
