private static void OnColorChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
var map = d as ColorMap;
map?.ColorChanged?.Invoke(map, new ColorChangedEventArgs((Color)e.NewValue));
if (map == null || map._settingColor)
{
return;
}
var col = (Color)e.NewValue;
var hsl = ColorHelper.ToHSL(col);
map._lightnessMid.Color = ColorHelper.FromHSL(new Vector4(hsl.X, 1, 0.5f, 1));
double angle = Math.PI * 2 * hsl.X;
Vector2 normalized = new Vector2((float)Math.Cos(angle), (float)Math.Sin(angle));
Vector2 halfSize = new Vector2(
(float)map.ellipse.ActualWidth / 2,
(float)map.ellipse.ActualHeight / 2);
Vector2 pos = ((hsl.Y / 2) * normalized * halfSize * new Vector2(1, -1)) + halfSize;
map._colorX = pos.X;
map._colorY = pos.Y;
map.UpdateThumb();
}
private Color CalcWheelColor(float x, float y, float lightness)
{
x = x - 0.5f;
y = (1 - y) - 0.5f;
float saturation = 2 * (float)Math.Sqrt((x * x) + (y * y));
float hue = y < 0 ?
(float)Math.Atan2(-y, -x) + (float)Math.PI :
(float)Math.Atan2(y, x);
if (saturation > 1)
{
saturation = 1;
}
return(ColorHelper.FromHSL(new Vector4(hue / ((float)Math.PI * 2), saturation, lightness, 1)));
}
