public static Geometry RenderEllipse(DoughnutSegmentData context)
{
var centerPoint = new Point(context.Center.X, context.Center.Y);
EllipseGeometry outerEllipse = new EllipseGeometry();
outerEllipse.RadiusX = context.Radius1;
outerEllipse.RadiusY = context.Radius1;
outerEllipse.Center = centerPoint;
EllipseGeometry innerEllipse = new EllipseGeometry();
double innerRadius = context.Radius2;
innerEllipse.RadiusX = innerRadius;
innerEllipse.RadiusY = innerRadius;
innerEllipse.Center = centerPoint;
GeometryGroup data = new GeometryGroup();
data.Children.Add(outerEllipse);
data.Children.Add(innerEllipse);
return(data);
}
public static Geometry Render(PieDataPoint dataPoint, DoughnutSegmentData context)
{
if (dataPoint.SweepAngle >= ArcSegmentMaxAngle)
{
return(RenderEllipse(context));
}
else
{
return(RenderArc(context));
}
}
public static Geometry RenderArc(DoughnutSegmentData context)
{
PathFigure figure = new PathFigure();
figure.IsClosed = true;
figure.IsFilled = true;
RadPoint startPoint = RadMath.GetArcPoint(context.StartAngle, context.Center, context.Radius1);
figure.StartPoint = startPoint.ToPoint();
ArcSegment firstArc = new ArcSegment();
firstArc.Size = new Size(context.Radius1, context.Radius1);
firstArc.IsLargeArc = context.SweepAngle > 180 || context.SweepAngle < -180;
var angle = context.StartAngle;
if (context.SweepDirection == SweepDirection.Clockwise)
{
angle += context.SweepAngle;
}
else
{
angle -= context.SweepAngle;
}
firstArc.SweepDirection = context.SweepAngle > 0 ? context.SweepDirection : context.SweepDirection ^ SweepDirection.Clockwise;
firstArc.Point = RadMath.GetArcPoint(angle, context.Center, context.Radius1).ToPoint();
figure.Segments.Add(firstArc);
LineSegment firstLine = new LineSegment();
firstLine.Point = RadMath.GetArcPoint(angle, context.Center, context.Radius2).ToPoint();
figure.Segments.Add(firstLine);
ArcSegment secondArc = new ArcSegment();
secondArc.Size = new Size(context.Radius2, context.Radius2);
secondArc.IsLargeArc = context.SweepAngle > 180 || context.SweepAngle < -180;
secondArc.SweepDirection = context.SweepAngle > 0 ? context.SweepDirection ^ SweepDirection.Clockwise : context.SweepDirection;
secondArc.Point = RadMath.GetArcPoint(context.StartAngle, context.Center, context.Radius2).ToPoint();
figure.Segments.Add(secondArc);
PathGeometry geometry = new PathGeometry();
geometry.Figures.Add(figure);
return(geometry);
}
private void UpdateHighlightPath(PieDataPoint dataPoint, PieUpdateContext updateContext)
{
DoughnutSegmentData segment = new DoughnutSegmentData()
{
Center = new RadPoint(updateContext.Center.X, updateContext.Center.Y),
Radius1 = updateContext.Radius,
Radius2 = updateContext.Radius * this.ParentSeries.HighlightInnerRadiusFactor,
StartAngle = updateContext.StartAngle,
SweepAngle = dataPoint.SweepAngle,
SweepDirection = updateContext.SweepDirection
};
this.highlightPath.Data = DoughnutSegmentRenderer.Render(dataPoint, segment);
}
private static Geometry BuildRadialStripe(RadCircle circle, RadCircle previousCircle)
{
DoughnutSegmentData segment = new DoughnutSegmentData()
{
Center = new RadPoint(circle.Center.X + 0.5, circle.Center.Y + 0.5),
Radius1 = circle.Radius + 0.5,
Radius2 = previousCircle.Radius - 0.5,
StartAngle = 0,
SweepAngle = 359.99 // 360 does not render properly
};
if (segment.Radius1 < 0)
{
segment.Radius1 = 0;
}
if (segment.Radius2 < 0)
{
segment.Radius2 = 0;
}
return(DoughnutSegmentRenderer.RenderArc(segment));
}
