public override IFigure HitTest(Point point)
{
var width = LogicalWidth();
var r = Math.Distance(Center, point);
var angleToPoint = Math.GetAngle(Center, point);
// Find the point relative to the ellipse in canonical form(unrotated).
var canonicalPoint = Math.RotatePoint(Center, r, angleToPoint - Inclination).Minus(Center);
var equationLeft = canonicalPoint.X.Sqr() / SemiMajor.Sqr() + canonicalPoint.Y.Sqr() / SemiMinor.Sqr();
// HitTest for the edge
if ((equationLeft - 1).Abs() < CursorTolerance + width / 2)
{
return(this);
}
// HitTest for the fill. Use this instead of base.HitTest() because it is not working properly with ellipses.
var shapeStyle = Style as ShapeStyle;
if (shapeStyle != null)
{
if (shapeStyle.IsFilled && equationLeft < 1)
{
return(this);
}
}
return(null);
}
public override IFigure HitTest(Point point)
{
// HitTest for the fill.
ShapeStyle shapeStyle = Style as ShapeStyle;
if (shapeStyle != null)
{
if (shapeStyle.IsFilled)
{
var fillResult = HitTestShape(point);
if (fillResult != null)
{
return(fillResult);
}
}
}
// HitTest for the edge
var width = LogicalWidth();
var r = Math.Distance(Center, point);
var angleToPoint = Math.GetAngle(Center, point);
bool between = Math.IsAngleBetweenAngles(angleToPoint, StartAngle, EndAngle, Clockwise);
if (between)
{
// Find the point relative to the ellipse in canonical form(unrotated).
var canonicalPoint = Math.RotatePoint(Center, r, angleToPoint - Inclination).Minus(Center);
var equationLeft = canonicalPoint.X.Sqr() / SemiMajor.Sqr() + canonicalPoint.Y.Sqr() / SemiMinor.Sqr();
// A cheap way to deal with small arcs.
var tolerance = CursorTolerance + width / 2;
if (SemiMajor < 1 || SemiMinor < 1)
{
tolerance += .25;
}
if ((equationLeft - 1).Abs() < tolerance)
{
return(this);
}
}
// HitTest for the chord (if necessary).
if (this is EllipseSegment || this is CircleSegment)
{
var epsilon = ToLogical(this.Shape.StrokeThickness) / 2 + CursorTolerance;
if (Math.IsPointOnSegment(new PointPair(BeginLocation, EndLocation), point, epsilon))
{
return(this);
}
}
// HitTest for the radii (if necessary).
if (this is EllipseSector || this is CircleSector)
{
var epsilon = ToLogical(this.Shape.StrokeThickness) / 2 + CursorTolerance;
if (Math.IsPointOnSegment(new PointPair(Center, BeginLocation), point, epsilon) ||
Math.IsPointOnSegment(new PointPair(Center, EndLocation), point, epsilon))
{
return(this);
}
}
return(null);
}
