public ColorPickerPanel()
{
var colorProperty = new Property <ColorHSVA>(() => colorHSVA, c => colorHSVA = c);
spectrum = new Spectrum(colorProperty);
spectrum.DragStarted += () => DragStarted?.Invoke();
spectrum.Changed += () => Changed?.Invoke();
spectrum.DragEnded += () => DragEnded?.Invoke();
valueSlider = new ValueSlider(colorProperty);
alphaSlider = new AlphaSlider(colorProperty);
SetupSliderDragHandlers(valueSlider.Widget);
SetupSliderDragHandlers(alphaSlider.Widget);
Widget = new Widget
{
Padding = new Thickness(8),
Layout = new VBoxLayout {
Spacing = 8
},
Nodes =
{
new Widget {
LayoutCell = new LayoutCell(Alignment.Center),
Layout = new StackLayout(),
Nodes =
{
spectrum.Widget
}
},
valueSlider.Widget,
alphaSlider.Widget,
}
};
Widget.FocusScope = new KeyboardFocusScope(Widget);
}
void DrawControl()
{
int size = (int)Math.Floor(OuterRadius * 2);
if (wasHueChanged)
{
if (image == null)
{
image = new Color4[size * size];
}
for (int y = 0; y < size; ++y)
{
for (int x = 0; x < size; ++x)
{
var pick = Pick(size - x - 1, y);
if (pick.Area == Area.Outside)
{
image[y * size + x] = Color4.Transparent;
}
else if (pick.Area == Area.Wheel)
{
image[y * size + x] = new ColorHSVA(pick.H.Value, 1, 1).ToRGBA();
}
else
{
image[y * size + x] = new ColorHSVA(color.Value.H, pick.S.Value, pick.V.Value).ToRGBA();
}
}
}
texture.LoadImage(image, size, size);
wasHueChanged = false;
}
Renderer.DrawSprite(texture, Color4.White, Vector2.Zero, Vector2.One * size, new Vector2(1, 0), new Vector2(0, 1));
}
public static ColorHSVA FromRGBA(Color4 rgb)
{
var c = new ColorHSVA();
int max = Math.Max(rgb.R, Math.Max(rgb.G, rgb.B));
int min = Math.Min(rgb.R, Math.Min(rgb.G, rgb.B));
c.H = GetHue(rgb);
c.S = (max == 0) ? 0 : 1f - (1f * min / max);
c.V = max / 255f;
c.A = rgb.A / 255f;
return(c);
}
