private void UpdateHistogramDisplay()
{
if (_histogramRawCache != null &&
_histogramDisplayCache != null)
{
var graphics2D = _histogramDisplayCache.NewGraphics2D();
graphics2D.Clear(Color.Transparent);
_histogramDisplayCache.CopyFrom(_histogramRawCache);
var rangeStart = RangeStart.Value(this);
var rangeEnd = RangeEnd.Value(this);
graphics2D.FillRectangle(0, 0, rangeStart * _histogramDisplayCache.Width, _histogramDisplayCache.Height, new Color(Color.Red, 100));
graphics2D.FillRectangle(rangeEnd * _histogramDisplayCache.Width, 0, 255, _histogramDisplayCache.Height, new Color(Color.Red, 100));
graphics2D.Line(rangeStart * _histogramDisplayCache.Width, 0, rangeStart * _histogramDisplayCache.Width, _histogramDisplayCache.Height, new Color(Color.LightGray, 200));
graphics2D.Line(rangeEnd * _histogramDisplayCache.Width, 0, rangeEnd * _histogramDisplayCache.Width, _histogramDisplayCache.Height, new Color(Color.LightGray, 200));
}
}
public override Task Rebuild()
{
this.DebugDepth("Rebuild");
UpdateHistogramDisplay();
bool propertyUpdated = false;
var minSeparation = .01;
var rangeStart = RangeStart.Value(this);
var rangeEnd = RangeEnd.Value(this);
if (rangeStart < 0 ||
rangeStart > 1 ||
rangeEnd < 0 ||
rangeEnd > 1 ||
rangeStart > rangeEnd - minSeparation)
{
rangeStart = Math.Max(0, Math.Min(1 - minSeparation, rangeStart));
rangeEnd = Math.Max(0, Math.Min(1, rangeEnd));
if (rangeStart > rangeEnd - minSeparation)
{
// values are overlapped or too close together
if (rangeEnd < 1 - minSeparation)
{
// move the end up whenever possible
rangeEnd = rangeStart + minSeparation;
}
else
{
// move the end to the end and the start up
rangeEnd = 1;
RangeStart = 1 - minSeparation;
}
}
propertyUpdated = true;
}
var rebuildLock = RebuildLock();
// now create a long running task to process the image
return(ApplicationController.Instance.Tasks.Execute(
"Calculate Path".Localize(),
null,
(reporter, cancellationToken) =>
{
var progressStatus = new ProgressStatus();
this.GenerateMarchingSquaresAndLines(
(progress0to1, status) =>
{
progressStatus.Progress0To1 = progress0to1;
progressStatus.Status = status;
reporter.Report(progressStatus);
},
Image,
ThresholdFunction);
if (propertyUpdated)
{
UpdateHistogramDisplay();
this.Invalidate(InvalidateType.Properties);
}
UiThread.RunOnIdle(() =>
{
rebuildLock.Dispose();
Parent?.Invalidate(new InvalidateArgs(this, InvalidateType.Path));
});
return Task.CompletedTask;
}));
}
