public void Draw(GraphicsHandler graphics, bool stroke, FillMode fillMode, bool clip)
{
var outerRadius = Radius.Width;
var yscale = Radius.Height / Radius.Width;
var center = Center;
var origin = GradientOrigin;
var scale = 1f;
var rect = graphics.Control.GetPathBoundingBox().ToEto();
if (stroke)
{
graphics.Control.ReplacePathWithStrokedPath();
}
if (clip)
{
graphics.Clip(fillMode);
}
if (wrap != GradientWrapMode.Pad)
{
// use eto's transformrectangle as it'll make the rect encompass the resulting transformed area
var boundRect = transform.Invert().ToEto().TransformRectangle(rect);
// find max number of iterations we need to fill the bounding rectangle
scale = GradientHelper.GetRadialScale(Center, Radius, GradientOrigin, boundRect);
}
if (Gradient == null || scale > lastScale)
{
var stops = GradientHelper.GetGradientStops(StartColor.ToCG(), EndColor.ToCG(), scale, wrap).ToList();
lastScale = scale;
Gradient = new CGGradient(CGColorSpace.CreateDeviceRGB(), stops.Select(r => r.Item2).ToArray(), stops.Select(r => (nfloat)r.Item1).ToArray());
}
else
{
scale = lastScale;
}
var scaledRect = new RectangleF(GradientOrigin - (GradientOrigin - Center + Radius) * scale, GradientOrigin + (Center + Radius - GradientOrigin) * scale);
center = scaledRect.Center;
outerRadius *= scale;
// adjust center based on ellipse scale from gradient origin
center.Y = origin.Y - (origin.Y - center.Y) / yscale;
// scale to draw elliptical gradient
var t = new CGAffineTransform(1, 0f, 0f, yscale, 0, origin.Y - origin.Y * yscale);
t.Multiply(transform);
graphics.Control.SaveState();
graphics.Control.ConcatCTM(t);
graphics.Control.DrawRadialGradient(Gradient, origin.ToNS(), 0, center.ToNS(), outerRadius, CGGradientDrawingOptions.DrawsAfterEndLocation | CGGradientDrawingOptions.DrawsBeforeStartLocation);
graphics.Control.RestoreState();
}