public static void Reverse(this SKPath path)
{
var clone = new SKPath(path);
path = new();
path.AddPathReverse(clone);
}
void OnPaint(object sender, SKPaintSurfaceEventArgs e)
{
SKImageInfo info = e.Info;
SKSurface surface = e.Surface;
SKCanvas canvas = surface.Canvas;
canvas.Clear();
using (var primaryPaint = new SKPaint
{
IsAntialias = true,
Style = SKPaintStyle.Stroke,
StrokeCap = SKStrokeCap.Round,
StrokeWidth = (float)Thickness,
})
using (var path = new SKPath())
using (var backgroundPath = new SKPath())
{
var margin = (float)Thickness / 2.0f;
if (RadialBackgroundColor != Color.Default && RadialBackgroundColor != Color.Transparent)
{
primaryPaint.Color = RadialBackgroundColor.ToSKColor();
backgroundPath.AddArc(new SKRect(margin, margin, info.Width - margin, info.Height - margin), -90 + (float)StartAngle, (float)SweepAngle);
canvas.DrawPath(backgroundPath, primaryPaint);
}
SKColor[] colors = new SKColor[]
{
RadialStartColor.ToSKColor(),
RadialStartColor.ToSKColor(),
RadialMiddleColor.ToSKColor(),
RadialMiddleColor.ToSKColor(),
RadialEndColor.ToSKColor(),
RadialEndColor.ToSKColor(),
RadialStartColor.ToSKColor(),
};
float[] colorPos = new float[]
{
0, // start
(1 / 6.0f) * 1, // start
(1 / 6.0f) * 2, // mid
(1 / 6.0f) * 3, // mid
(1 / 6.0f) * 4, // end
(1 / 6.0f) * 5.7f, // end
0.95f // start
};
primaryPaint.Shader = SKShader.CreateSweepGradient(new SKPoint(info.Rect.MidX, info.Rect.MidY), colors, colorPos, SKShaderTileMode.Repeat, -90 + (float)StartAngle, -90 + (float)StartAngle + (float)SweepAngle);
path.AddArc(new SKRect(margin, margin, info.Width - margin, info.Height - margin), -90 + (float)StartAngle, (float)SweepAngle * (float)Progress);
canvas.DrawPath(path, primaryPaint);
if (HasLabel)
{
using (var fontPaint = new SKPaint
{
IsAntialias = true,
Color = TextColor.ToSKColor(),
TextSize = (float)FontSize,
})
using (var fontPath = new SKPath())
{
fontPath.AddPathReverse(path);
canvas.DrawTextOnPath(string.Format(TextFormat, Progress), fontPath, 0, (float)FontSize / 3.0f, fontPaint);
}
}
}
}
