public override CustomPath CalculatePath()
{
var startOuterPolar = new PolarPoint(PolarOffset, outerRadius);
var endOuterPolar = new PolarPoint(PolarOffset + ArcAngle, outerRadius);
var startInnerPolar = new PolarPoint(PolarOffset, outerRadius - RingWidth);
var endInnerPolar = new PolarPoint(PolarOffset + ArcAngle, outerRadius - RingWidth);
return new CustomPath(this)
{
Data = new PathGeometry
{
Figures = new PathFigureCollection
{
new PathFigure
{
StartPoint = startOuterPolar.ToCartesian().LocalizeInPolarSpace(RenderSize),
Segments = new PathSegmentCollection
{
new ArcSegment
{
Size = outerSize,
Point = endOuterPolar.ToCartesian().LocalizeInPolarSpace(RenderSize),
IsLargeArc = ArcAngle > 180
},
new LineSegment
{
Point = endInnerPolar.ToCartesian().LocalizeInPolarSpace(RenderSize)
},
new ArcSegment
{
Size = innerSize,
Point = startInnerPolar.ToCartesian().LocalizeInPolarSpace(RenderSize),
SweepDirection = SweepDirection.Clockwise,
IsLargeArc = ArcAngle > 180
}
}
}
}
}
};
}
public static Geometry CalculateArcPath(Size size, double radius, double arcWidth, double angle, double offsetAngle)
{
if (radius <= 0 || arcWidth <= 0 || radius - arcWidth < 0)
return Geometry.Empty;
var startOuterPolar = new PolarPoint(offsetAngle, radius);
var endOuterPolar = new PolarPoint(offsetAngle + angle, radius);
var startInnerPolar = new PolarPoint(offsetAngle, radius - arcWidth);
var endInnerPolar = new PolarPoint(offsetAngle + angle, radius - arcWidth);
var isLargeArc = angle > 180;
var startOuter = startOuterPolar.ToCartesian().LocalizeInPolarSpace(size);
var endOuter = endOuterPolar.ToCartesian().LocalizeInPolarSpace(size);
var startInner = startInnerPolar.ToCartesian().LocalizeInPolarSpace(size);
var endInner = endInnerPolar.ToCartesian().LocalizeInPolarSpace(size);
return new PathGeometry
{
Figures = new PathFigureCollection
{
new PathFigure
{
StartPoint = startOuter,
Segments = new PathSegmentCollection
{
new ArcSegment
{
Size = new Size(radius, radius),
Point = endOuter,
IsLargeArc = isLargeArc
},
new LineSegment
{
Point = endInner
},
new ArcSegment
{
Size = new Size(radius - arcWidth, radius - arcWidth),
Point = startInner,
SweepDirection = SweepDirection.Clockwise,
IsLargeArc = isLargeArc
}
}
}
}
};
}
