public SKShader CreateShader(IRadialGradient gradient, DrawContext context)
{
var rect = context.RenderRect.ToRectF();
var circle = new RadialGradientGeometry();
circle.CalculateOffsets(gradient, context.RenderRect.Width, context.RenderRect.Height);
var renderStops = GetRenderStops(gradient);
var lastOffset = gradient.IsRepeating ? renderStops.LastOrDefault()?.RenderOffset ?? 1 : 1;
var colors = renderStops.Select(x => x.Color.ToSKColor()).ToArray();
var colorPos = renderStops.Select(x => lastOffset > 0 ? x.RenderOffset / lastOffset : 0).ToArray();
circle.CalculateGeometry(gradient, rect, lastOffset, context.PixelScaling);
var center = circle.Center.ToSKPoint();
var shader = SKShader.CreateRadialGradient(
center,
Math.Min(circle.Radius.Width, circle.Radius.Height),
colors,
colorPos,
gradient.IsRepeating ? SKShaderTileMode.Repeat : SKShaderTileMode.Clamp,
GetScaleMatrix(center, circle.Radius.Width, circle.Radius.Height));
return(shader);
}
private Paint CreateRadialPaint(IRadialGradient gradient, DrawContext context)
{
var rect = context.RenderRect;
var circle = new RadialGradientGeometry();
circle.CalculateOffsets(gradient, (int)context.RenderRect.Width, (int)context.RenderRect.Height);
var renderStops = GetRenderStops(gradient);
var lastOffset = gradient.IsRepeating ? renderStops.LastOrDefault()?.Offset ?? 1 : 1;
circle.CalculateGeometry(gradient, rect, lastOffset, context.PixelScaling);
foreach (var stop in renderStops)
{
stop.Offset = lastOffset > 0 ? stop.Offset / lastOffset : 0;
}
// Convert pixels to proportional
var center = new Point(circle.Center.X / rect.Width, circle.Center.Y / rect.Height);
var radius = new Size(circle.Radius.Width / rect.Width, circle.Radius.Height / rect.Height);
return(new RadialGradientPaintEx(renderStops, center, radius, gradient.IsRepeating));
}
void AddFromIRadialGradient(IRadialGradient content, YamlMap result)
{
AddFromIGradient(content, result);
result.Add(nameof(content.HighlightDegrees), FromAnimatable(content.HighlightDegrees));
result.Add(nameof(content.HighlightLength), FromAnimatable(content.HighlightLength));
}
