/// <inheritdoc/>
protected override bool OnDraw(CanvasDevice device, CanvasDrawingSession session, Vector2 size)
{
// Create our Brush
if (GradientStops != null && GradientStops.Count > 0)
{
var gradientBrush = new CanvasRadialGradientBrush(
device,
GradientStops.ToWin2DGradientStops(),
SpreadMethod.ToEdgeBehavior(),
(CanvasAlphaMode)(int)AlphaMode,
ColorInterpolationMode.ToCanvasColorSpace(),
CanvasColorSpace.Srgb,
CanvasBufferPrecision.Precision8UIntNormalized)
{
// Calculate Surface coordinates from 0.0-1.0 range given in WPF brush
RadiusX = size.X * (float)RadiusX,
RadiusY = size.Y * (float)RadiusY,
Center = size * Center.ToVector2(),
// Calculate Win2D Offset from origin/center used in WPF brush
OriginOffset = size * (GradientOrigin.ToVector2() - Center.ToVector2()),
};
// Use brush to draw on our canvas
session.FillRectangle(size.ToRect(), gradientBrush);
gradientBrush.Dispose();
return(true);
}
return(false);
}
private void Dispose(bool disposing)
{
if (_canvasRadialGradientBrush != null)
{
_canvasRadialGradientBrush.Dispose();
_canvasRadialGradientBrush = null;
}
}
private void Dispose(bool disposing)
{
if (_canvasRadialGradientBrush != null)
{
try
{
_canvasRadialGradientBrush.Dispose();
}
catch
{
// Ignore
}
finally
{
_canvasRadialGradientBrush = null;
}
}
}