public static void OnColorChanged(DependencyObject obj, DependencyPropertyChangedEventArgs args)
{
// Force a re-render of the object if a visual-related property changes
WheelSelector ctl = (obj as WheelSelector);
ctl.InvalidateVisual();
//TODO: Figure out how to handle circular dependencies properly.
// Currently I'm using propUpdateFlag to prevent infinite loops here.
// Ideally there should be a way to update the local values without calling
// this callback again (but still notifying other users)
if (!propUpdateFlag)
{
propUpdateFlag = true;
if (args.Property == WheelSelector.ThetaProperty || args.Property == WheelSelector.RadProperty)
{
ctl.RGBValue = ctl.wheel.ColourMapping(ctl.Rad, CircularMath.Mod(ctl.Theta), 1.0);
}
if (args.Property == WheelSelector.RGBValueProperty)
{
var rgb = (RGBColor)args.NewValue;
var pt = ctl.wheel.InverseColourMapping(rgb);
ctl.SetCurrentValue(ThetaProperty, pt.X);
ctl.SetCurrentValue(RadProperty, pt.Y);
}
propUpdateFlag = false;
}
}
private static void OnHSPropertyAnimated(DependencyObject obj, DependencyPropertyChangedEventArgs args)
{
WheelSelector ctl = (obj as WheelSelector);
ctl.Theta = (args.NewValue as Point?).Value.X;
ctl.Rad = (args.NewValue as Point?).Value.Y;
ctl.InvalidateVisual();
}
public static void OnThumbSizeChanged(DependencyObject obj, DependencyPropertyChangedEventArgs args)
{
// Force a re-render of the object if the thumb size changes
WheelSelector ctl = (obj as WheelSelector);
ctl.UpdateThumbSize();
ctl.InvalidateMeasure(); // Updating the thumbsize changes the dial radius
ctl.UpdateSelector(); // Also need to re-calculate the thumb position
ctl.InvalidateVisual(); // And then re-paint everything
}
public static void RenderToPng(int w, int h, string filename, double thumb_size = 0.5)
{
var ctl = new WheelSelector();
ctl.ThumbSize = w * thumb_size;
ctl.Rad = 0.0;
ctl.Measure(new Size(w, h));
ctl.Arrange(new Rect(new Size(w, h)));
ctl.UpdateLayout();
RenderTargetBitmap bitmap = new RenderTargetBitmap(w, h, 96, 96, PixelFormats.Pbgra32);
bitmap.Render(ctl);
PngBitmapEncoder png = new PngBitmapEncoder();
png.Frames.Add(BitmapFrame.Create(bitmap));
using (Stream s = File.Create(filename))
{
png.Save(s);
}
}
