//http://gaggerostechnicalnotes.blogspot.com/2012/01/wpf-colors-scale.html
private WriteableBitmap CreateColorRangeBitmap(DSCore.ColorRange1D colorRange)
{
const int width = 64;
const int height = 1;
var bitmap = new WriteableBitmap(width, height, 96, 96, PixelFormats.Bgra32, null);
var pixels = new uint[width * height];
for (var i = 1; i <= width; i++)
{
var t = (double)i / width;
var newColor = DSCore.ColorRange1D.GetColorAtParameter(colorRange, t);
pixels[i - 1] = (uint)((255 << 24) + (newColor.Red << 16) + (newColor.Green << 8) + newColor.Blue);
}
bitmap.WritePixels(new Int32Rect(0, 0, width, height), pixels, width * 4, 0);
return(bitmap);
}
private void UpdateColorRange()
{
var s = dynamoViewModel.Model.Scheduler;
// prevent data race by running on scheduler
var t = new DelegateBasedAsyncTask(s, () =>
{
colorRange = colorRangeNode.ComputeColorRange(dynamoModel.EngineController);
});
// then update on the ui thread
t.ThenSend((_) =>
{
var bmp = CreateColorRangeBitmap(colorRange);
gradientImage.Source = bmp;
}, syncContext);
s.ScheduleForExecution(t);
}
