/// <summary> /// Attempts to get an optional feature from the drawing context implementation /// </summary> public static T?GetFeature <T>(this IDrawingContextImpl context) where T : class => (T?)context.GetFeature(typeof(T));
public void Render(IDrawingContextImpl context)
{
var leaseFeature = context.GetFeature <ISkiaSharpApiLeaseFeature>();
if (leaseFeature == null)
{
using (var c = new DrawingContext(context, false))
{
c.DrawText(_noSkia, new Point());
}
}
else
{
using var lease = leaseFeature.Lease();
var canvas = lease.SkCanvas;
canvas.Save();
// create the first shader
var colors = new SKColor[] {
new SKColor(0, 255, 255),
new SKColor(255, 0, 255),
new SKColor(255, 255, 0),
new SKColor(0, 255, 255)
};
var sx = Animate(100, 2, 10);
var sy = Animate(1000, 5, 15);
var lightPosition = new SKPoint(
(float)(Bounds.Width / 2 + Math.Cos(St.Elapsed.TotalSeconds) * Bounds.Width / 4),
(float)(Bounds.Height / 2 + Math.Sin(St.Elapsed.TotalSeconds) * Bounds.Height / 4));
using (var sweep =
SKShader.CreateSweepGradient(new SKPoint((int)Bounds.Width / 2, (int)Bounds.Height / 2), colors,
null))
using (var turbulence = SKShader.CreatePerlinNoiseFractalNoise(0.05f, 0.05f, 4, 0))
using (var shader = SKShader.CreateCompose(sweep, turbulence, SKBlendMode.SrcATop))
using (var blur = SKImageFilter.CreateBlur(Animate(100, 2, 10), Animate(100, 5, 15)))
using (var paint = new SKPaint
{
Shader = shader,
ImageFilter = blur
})
canvas.DrawPaint(paint);
using (var pseudoLight = SKShader.CreateRadialGradient(
lightPosition,
(float)(Bounds.Width / 3),
new [] {
new SKColor(255, 200, 200, 100),
SKColors.Transparent,
new SKColor(40, 40, 40, 220),
new SKColor(20, 20, 20, (byte)Animate(100, 200, 220))
},
new float[] { 0.3f, 0.3f, 0.8f, 1 },
SKShaderTileMode.Clamp))
using (var paint = new SKPaint
{
Shader = pseudoLight
})
canvas.DrawPaint(paint);
canvas.Restore();
}
}