protected override void OnRender(DrawingContext drawingContext)
{
// calculate pixels of color canvas
var pixels = new byte[(int)ActualWidth * (int)ActualHeight * 4];
var saturation = Saturation;
var width = (int)ActualWidth;
var height = (int)ActualHeight;
var i = 0;
for (var y = 0; y < height; y++)
{
for (var x = 0; x < width; x++)
{
var luminance = 1f - (double)y / height;
var hue = x * 365d / width;
var color = new HslRgbColor(hue, saturation, luminance);
pixels[i++] = color.B;
pixels[i++] = color.G;
pixels[i++] = color.R;
i++; // Bgr32 format ignores 4th byte
}
}
if (_bitmap == null || (_bitmap.PixelWidth == width && _bitmap.PixelHeight == height))
{
_bitmap = new WriteableBitmap(width, height, 96, 96, PixelFormats.Bgr32, null); // heavy ctor, reuse instance
}
_bitmap.WritePixels(new Int32Rect(0, 0, (int)ActualWidth, (int)ActualHeight), pixels, (int)ActualWidth * 4, 0);
drawingContext.DrawImage(_bitmap, new Rect(RenderSize));
}
private void UpdateGradient()
{
if (_size.Width == 0)
{
return;
}
var pixels = new byte[(int)_size.Width * 4];
var width = (int)_size.Width;
var channel = ColorChannel;
var i = 0;
for (var x = 0; x < width; x++)
{
HslRgbColor color = null;
var value = (double)x / width;
switch (channel)
{
case ColorChannel.Red:
color = new HslRgbColor((byte)(value * 255), Green, Blue);
break;
case ColorChannel.Green:
color = new HslRgbColor(Green, (byte)(value * 255), Blue);
break;
case ColorChannel.Blue:
color = new HslRgbColor(Green, Blue, (byte)(value * 255));
break;
case ColorChannel.Hue:
color = new HslRgbColor(value * 365d, Saturation, Luminance);
break;
case ColorChannel.Saturation:
color = new HslRgbColor(Hue, value, Luminance);
break;
case ColorChannel.Luminance:
color = new HslRgbColor(Hue, Saturation, value);
break;
}
pixels[i++] = color.B;
pixels[i++] = color.G;
pixels[i++] = color.R;
i++;
}
if (_bitmap == null || width != _bitmap.PixelWidth)
{
_bitmap = new WriteableBitmap(width, 1, 96, 96, PixelFormats.Bgr32, null); // this is a heavy one, reuse as much as possible
}
_bitmap.WritePixels(new Int32Rect(0, 0, width, 1), pixels, width * 4, 0);
}
public override void OnApplyTemplate()
{
base.OnApplyTemplate();
GetTemplateParts();
// ensure all fields contain the initial values because Color was set before ApplyTemplate().
UpdateAll();
_hueTextBox.KeyDown += ConvertEnterToTab;
_hueTextBox.KeyDown += ConvertEnterToTab;
_hueTextBox.KeyDown += ConvertEnterToTab;
_hueTextBox.KeyDown += ConvertEnterToTab;
_hueTextBox.KeyDown += ConvertEnterToTab;
_hueTextBox.KeyDown += ConvertEnterToTab;
_hueTextBox.LostFocus += (sender, args) => { OnValueTextBoxLostFocus(_hueTextBox, ColorChannel.Hue, Color.H, 1, 359); };
_saturationTextBox.LostFocus += (sender, args) => { OnValueTextBoxLostFocus(_saturationTextBox, ColorChannel.Saturation, Color.S, 100, 1); };
_luminanceTextBox.LostFocus += (sender, args) => { OnValueTextBoxLostFocus(_luminanceTextBox, ColorChannel.Luminance, Color.L, 100, 1); };
_redTextBox.LostFocus += (sender, args) => { OnValueTextBoxLostFocus(_redTextBox, ColorChannel.Red, Color.R, 1, 255); };
_greenTextBox.LostFocus += (sender, args) => { OnValueTextBoxLostFocus(_greenTextBox, ColorChannel.Green, Color.G, 1, 255); };
_blueTextBox.LostFocus += (sender, args) => { OnValueTextBoxLostFocus(_blueTextBox, ColorChannel.Blue, Color.B, 1, 255); };
_hueSlider.ValueChanged += (sender, args) => { if (!WasUserChange(sender))
{
return;
}
ChangeColorChannelValue(ColorChannel.Hue, _hueSlider.Value); };
_saturationSlider.ValueChanged += (sender, args) => { if (!WasUserChange(sender))
{
return;
}
ChangeColorChannelValue(ColorChannel.Saturation, _saturationSlider.Value); };
_luminanceSlider.ValueChanged += (sender, args) => { if (!WasUserChange(sender))
{
return;
}
ChangeColorChannelValue(ColorChannel.Luminance, _luminanceSlider.Value); };
_redSlider.ValueChanged += (sender, args) => { if (!WasUserChange(sender))
{
return;
}
ChangeColorChannelValue(ColorChannel.Red, _redSlider.Value); };
_greenSlider.ValueChanged += (sender, args) => { if (!WasUserChange(sender))
{
return;
}
ChangeColorChannelValue(ColorChannel.Green, _greenSlider.Value); };
_blueSlider.ValueChanged += (sender, args) => { if (!WasUserChange(sender))
{
return;
}
ChangeColorChannelValue(ColorChannel.Blue, _blueSlider.Value); };
_hexCodeTextBox.LostFocus += (sender, args) =>
{
if (ColorUtils.IsHexCode(_hexCodeTextBox.Text))
{
var color = ColorUtils.FromHex(_hexCodeTextBox.Text);
Color = new HslRgbColor(color.R, color.G, color.B);
}
else
{
UpdateHexCodeField(); // revert
}
};
_colorCanvas.ColorPicked += (sender, args) => Color = args.Color;
_isTemplateApplied = true;
}
public ColorRoutedEventArgs(RoutedEvent routedEvent, HslRgbColor color)
: base(routedEvent)
{
Color = color;
}
