void DrawElement(Func <Rect> add, Pen pen = null, Brush brush = null)
{
if (pen == null && brush == null)
{
return;
}
var lgb = brush as LinearGradientBrush;
if (lgb != null)
{
var cg = CreateGradient(lgb.Stops);
context.SaveState();
var frame = add();
context.Clip();
CGGradientDrawingOptions options = CGGradientDrawingOptions.DrawsBeforeStartLocation | CGGradientDrawingOptions.DrawsAfterEndLocation;
var size = frame.Size;
var start = Conversions.GetCGPoint(lgb.Absolute ? lgb.Start : frame.Position + lgb.Start * size);
var end = Conversions.GetCGPoint(lgb.Absolute ? lgb.End : frame.Position + lgb.End * size);
context.DrawLinearGradient(cg, start, end, options);
context.RestoreState();
brush = null;
}
var rgb = brush as RadialGradientBrush;
if (rgb != null)
{
var cg = CreateGradient(rgb.Stops);
context.SaveState();
var frame = add();
context.Clip();
CGGradientDrawingOptions options = CGGradientDrawingOptions.DrawsBeforeStartLocation | CGGradientDrawingOptions.DrawsAfterEndLocation;
var size = frame.Size;
var start = Conversions.GetCGPoint(rgb.GetAbsoluteCenter(frame));
var r = (nfloat)rgb.GetAbsoluteRadius(frame).Max;
var end = Conversions.GetCGPoint(rgb.GetAbsoluteFocus(frame));
context.DrawRadialGradient(cg, start, 0, end, r, options);
context.RestoreState();
brush = null;
}
if (pen != null || brush != null)
{
var mode = SetPenAndBrush(pen, brush);
add();
context.DrawPath(mode);
}
}
