public override void DrawInContext(CoreGraphics.CGContext ctx)
{
base.DrawInContext(ctx);
var knobFrame = CGRect.Inflate(PaintFrame, -2.0f, -2.0f);
UIBezierPath knobPath = UIBezierPath.FromRoundedRect((CGRect)knobFrame, (nfloat)knobFrame.Height * Slider.Curvaceousness / 2.0f);
// 1) fill - with a subtle shadow
ctx.SetShadow(new CGSize(0, 1), 1.0f, UIColor.Gray.CGColor);
ctx.SetFillColor(Slider.KnobColor.CGColor);
ctx.AddPath(knobPath.CGPath);
ctx.FillPath();
// 2) outline
ctx.SetStrokeColor(UIColor.Gray.CGColor);
ctx.SetLineWidth((nfloat)0.5f);
ctx.AddPath(knobPath.CGPath);
ctx.StrokePath();
// 3) inner gradient
var rect = CGRect.Inflate(knobFrame, -2.0f, -2.0f);
var clipPath = UIBezierPath.FromRoundedRect((CGRect)rect, (nfloat)rect.Height * Slider.Curvaceousness / 2.0f);
CGGradient myGradient;
CGColorSpace myColorspace;
nfloat[] locations = { 0.0f, 1.0f };
nfloat[] components = { 0.0f, 0.0f, 0.0f, 0.15f, // Start color
0.0f, 0.0f, 0.0f, 0.05f }; // End color
myColorspace = CGColorSpace.CreateDeviceRGB(); // CGColorSpaceCreateDeviceRGB();
myGradient = new CGGradient(myColorspace, components, locations);
CGPoint startPoint = new CGPoint((float)rect.GetMidX(), (float)rect.GetMinY());
CGPoint endPoint = new CGPoint((float)rect.GetMidX(), (float)rect.GetMaxY());
ctx.SaveState();
ctx.AddPath(clipPath.CGPath);
ctx.Clip();
ctx.DrawLinearGradient((CGGradient)myGradient, (CGPoint)startPoint, (CGPoint)endPoint, (CGGradientDrawingOptions)0);
myGradient.Dispose();
myColorspace.Dispose();
ctx.RestoreState();
// 4) highlight
if (Highlighted)
{
// fill
ctx.SetFillColor(UIColor.FromWhiteAlpha((nfloat)0.0f, (nfloat)0.1f).CGColor);
ctx.AddPath(knobPath.CGPath);
ctx.FillPath();
}
}
public override void DrawInContext(CoreGraphics.CGContext ctx)
{
CGRect rect = this.BoundsRect();
CGColorSpace colorSpace = CGColorSpace.CreateDeviceRGB();
nfloat [] colors = new nfloat[] {
0.42f, 0.66f, 0.31f, 1.0f,
0.95f, 0.76f, 0.20f, 1.0f,
0.80f, 0.25f, 0.15f, 1.0f
};
CGGradient gradient = new CGGradient(colorSpace, colors, null);
nuint tickSpaces = this.Axis.MajorTickCount - 1;
nuint pointsCount = 5;
if (this.Chart.Frame.Size.Height < this.Chart.Frame.Size.Width)
{
pointsCount = 3;
}
nfloat diameter = 8;
nfloat spaceHeight = rect.Size.Height / tickSpaces;
nfloat spacing = (spaceHeight - (pointsCount * diameter)) / (pointsCount + 1);
nuint allPointsCount = pointsCount * tickSpaces;
CGPath multipleCirclePath = new CGPath();
double y = rect.GetMinY() + diameter / 2.0f + spacing;
for (uint i = 1; i <= allPointsCount; i++)
{
CGPoint center = new CGPoint(rect.GetMidX(), y);
CGPath path = new CGPath();
path.AddArc(center.X, center.Y, (nfloat)diameter / 2.0f, 0, (nfloat)Math.PI * 2, true);
multipleCirclePath.AddPath(path);
y += spacing + diameter;
if (i % pointsCount == 0)
{
y += spacing;
}
}
ctx.SaveState();
ctx.AddPath(multipleCirclePath);
ctx.Clip();
CGPoint startPoint = new CGPoint(rect.GetMidX(), rect.GetMinY());
CGPoint endPoint = new CGPoint(rect.GetMidX(), rect.GetMaxY());
ctx.DrawLinearGradient(gradient, startPoint, endPoint, 0);
ctx.RestoreState();
base.DrawInContext(ctx);
}
