private void setColor(Color newColor)
{
double hue = 0.0;
double saturation = 0.0;
double value = 0.5;
ColorUtil.RgbToHsv(newColor.R, newColor.G, newColor.B, out hue, out saturation, out value);
lastValue = new HSVvalues()
{
alpha = newColor.A, hue = hue, saturation = saturation, value = value
};
setColorPicker(hue, saturation, value);
}
private void setColorPicker(double hue, double saturation, double value)
{
do
{
UIElement pick;
if (backCanvas.Children.Count == 0)
{
Ellipse rect = new Ellipse();
rect.Fill = Brushes.Black;
rect.Width = 5;
rect.Height = 5;
backCanvas.Children.Add(rect);
rect.RenderTransform = new TranslateTransform(-2.0, -2.0);
}
pick = backCanvas.Children[0];
double minDuametr = hsImage.ActualWidth;
if (hsImage.ActualWidth > hsImage.ActualHeight)
{
minDuametr = hsImage.ActualHeight;
}
double radius = (minDuametr / 2);
if (hue > 180.0)
{
hue = hue - 360.0;
}
double angleRadians = hue / (180.0 / Math.PI);
double ltang = Math.Tan(angleRadians);
double yRel = Math.Sqrt((saturation * radius) * (saturation * radius) / (1 + ltang * ltang));
double xRel = yRel * ltang;
if (hue > -90.0 && hue < 90.0)
{
xRel = -xRel;
yRel = -yRel;
}
lastValue = new HSVvalues()
{
alpha = lastValue.alpha, hue = hue, saturation = saturation, value = value
};
Canvas.SetTop(pick, -xRel + radius - 2.0);
Canvas.SetLeft(pick, -yRel + radius - 1.0);
if ((value * 100.0) > valueSlider.Minimum)
{
isNeedModify = true;
}
valueSlider.Value = value * 100.0;
valueSlider_ValueChanged(null, null);
isNeedModify = false;
} while (false);
}