private static PathGeometry ArcBlock(Arc arc, double fromAngle, double toAngle, double tickLength)
{
PathGeometry geometry = new PathGeometry();
PathFigure figure = new PathFigure();
geometry.Figures.Add(figure);
var op1 = arc.GetPoint(fromAngle);
var ip1 = arc.GetPoint(fromAngle, -1 * tickLength);
var op2 = arc.GetPoint(toAngle);
var ip2 = arc.GetPoint(toAngle, -1 * tickLength);
figure.StartPoint = op1;
var rotationAngle = toAngle - fromAngle;
var isLargeArc = arc.IsLargeAngle(fromAngle, toAngle);
var sweepDirection = arc.SweepDirection(fromAngle, toAngle);
figure.Segments.Add(new ArcSegment(op2, new Size(arc.Radius, arc.Radius), rotationAngle, isLargeArc, sweepDirection, true));
figure.Segments.Add(new LineSegment(ip2, true));
sweepDirection = arc.SweepDirection(toAngle, fromAngle);
var ri = arc.Radius - tickLength;
if (ri < 0)
{
ri = 0;
}
figure.Segments.Add(new ArcSegment(ip1, new Size(ri, ri), rotationAngle, isLargeArc, sweepDirection, true));
figure.Segments.Add(new LineSegment(op1, true));
figure.IsClosed = true;
figure.Freeze();
geometry.Freeze();
return geometry;
}
