public override UIImage GenerateBackgroundImage()
{
UIImage resultImage;
UIGraphics.BeginImageContextWithOptions(BackBounds.Size, false, UIScreen.MainScreen.Scale);
var center = new CGPoint(BackBounds.GetMidX(), BackBounds.GetMidY());
using (var context = UIGraphics.GetCurrentContext())
using (var circlePath = UIBezierPath.FromOval(new CGRect(CGPoint.Empty, BackBounds.Size)))
using (var borderBagelPath = BezierPathGenerator.Bagel(center, StartBorderRadius, EndBorderRadius, 0f, FullCircleAngle))
using (var innerBorderBagelPath = BezierPathGenerator.Bagel(center, StartBorderRadius + BorderPadding, EndBorderRadius - BorderPadding, 0f, FullCircleAngle)) {
context.SaveState();
context.SetFillColor(BackCircleBackgroundColor);
circlePath.Fill();
context.RestoreState();
context.SaveState();
context.SetFillColor(BackBorderColor);
borderBagelPath.Fill();
context.RestoreState();
context.SaveState();
context.SetFillColor(BackInnerBorderColor);
innerBorderBagelPath.Fill();
context.RestoreState();
resultImage = UIGraphics.GetImageFromCurrentImageContext();
}
return(resultImage);
}
void DrawInnerGlow(CGContext context, CGPoint center, nfloat startRadius, nfloat endRadius, CGColor glowColor, nfloat glowRadius)
{
using (var innerGlowPath = BezierPathGenerator.Bagel(center, startRadius - glowRadius - GlowOffset, startRadius - GlowOffset, 0f, FullCircleAngle))
using (var outerGlowPath = BezierPathGenerator.Bagel(center, endRadius + GlowOffset, endRadius + glowRadius + GlowOffset, 0f, FullCircleAngle)) {
context.SaveState();
#if __UNIFIED__
context.SetShadow(CGSize.Empty, glowRadius, glowColor);
#else
context.SetShadowWithColor(CGSize.Empty, glowRadius, glowColor);
#endif
context.SetFillColor(Color.CGColor);
context.AddPath(innerGlowPath.CGPath);
context.FillPath();
context.RestoreState();
context.SaveState();
#if __UNIFIED__
context.SetShadow(CGSize.Empty, glowRadius, glowColor);
#else
context.SetShadowWithColor(CGSize.Empty, glowRadius, glowColor);
#endif
context.SetFillColor(Color.CGColor);
context.SetFillColor(Color.CGColor);
context.AddPath(outerGlowPath.CGPath);
context.FillPath();
context.RestoreState();
}
}
protected override UIImage GenerateFullProgressImage()
{
UIImage resultImage;
UIGraphics.BeginImageContextWithOptions(Bounds.Size, false, UIScreen.MainScreen.Scale);
using (var context = UIGraphics.GetCurrentContext())
using (var path = BezierPathGenerator.Bagel(CenterPoint, startRadius, endRadius, 0f, FullCircleAngle)) {
context.SaveState();
context.SetFillColor(Color.CGColor);
context.AddPath(path.CGPath);
context.FillPath();
context.RestoreState();
context.SaveState();
context.AddPath(path.CGPath);
context.Clip();
DrawGradientOverlay(context);
DrawInnerGlow(context, CenterPoint, startRadius, endRadius, GlowColor, GlowRadius);
context.RestoreState();
resultImage = UIGraphics.GetImageFromCurrentImageContext();
}
return(resultImage);
}
public override void DrawInContext(CGContext context)
{
var progressAngle = CalculateProgressAngle(Percentage);
using (var path = BezierPathGenerator.Bagel(CenterPoint, startRadius, endRadius, 0f, progressAngle)) {
context.AddPath(path.CGPath);
context.Clip();
context.DrawImage(Bounds, fullProgressImage.CGImage);
}
}
