/// <summary>
/// Updates the histogram chart if it is marked dirty and is visible.
/// </summary>
private void maybeUpdateHistogram()
{
// We check
if (!splDisplay.Panel2Collapsed && histogramDirty)
{
addBackgroundOperation(
GraphicOperations.CalculateHistogram(new[] {
(cmbR.SelectedIndex > 0) ? dataset.Bands[cmbR.SelectedIndex - 1] : null,
(cmbG.SelectedIndex > 0) ? dataset.Bands[cmbG.SelectedIndex - 1] : null,
(cmbB.SelectedIndex > 0) ? dataset.Bands[cmbB.SelectedIndex - 1] : null
}),
"Calculating histogram of the RGB composite.",
(ps, pe) => {
double[][] data = pe.Result as double[][];
// Bind histogram values to the chart series.
chtHistogram.Series["R"].Points.DataBindY(data[0]);
chtHistogram.Series["G"].Points.DataBindY(data[1]);
chtHistogram.Series["B"].Points.DataBindY(data[2]);
histogramDirty = false;
});
}
}