public override void FindIntersection(Arc that, out Point inter1, out Point inter2)
{
// Find the points of intersection
this.theCircle.FindIntersection(that.theCircle, out inter1, out inter2);
// The points must be on this minor arc.
if (this is MinorArc)
{
if (!Arc.BetweenMinor(inter1, this))
{
inter1 = null;
}
if (!Arc.BetweenMinor(inter2, this))
{
inter2 = null;
}
}
else
{
if (!Arc.BetweenMajor(inter1, this))
{
inter1 = null;
}
if (!Arc.BetweenMajor(inter2, this))
{
inter2 = null;
}
}
// The points must be on thatArc
if (that is MinorArc)
{
if (!Arc.BetweenMinor(inter1, that))
{
inter1 = null;
}
if (!Arc.BetweenMinor(inter2, that))
{
inter2 = null;
}
}
else
{
if (!Arc.BetweenMajor(inter1, that))
{
inter1 = null;
}
if (!Arc.BetweenMajor(inter2, that))
{
inter2 = null;
}
}
if (inter1 == null && inter2 != null)
{
inter1 = inter2;
inter2 = null;
}
}
public override void FindIntersection(Segment that, out Point inter1, out Point inter2)
{
// Find the points of intersection
this.theCircle.FindIntersection(that, out inter1, out inter2);
// The points must be on this minor arc.
if (this is MinorArc)
{
if (!Arc.BetweenMinor(inter1, this))
{
inter1 = null;
}
if (!Arc.BetweenMinor(inter2, this))
{
inter2 = null;
}
}
else if (this is MajorArc)
{
if (!Arc.BetweenMajor(inter1, this))
{
inter1 = null;
}
if (!Arc.BetweenMajor(inter2, this))
{
inter2 = null;
}
}
else if (this is Semicircle)
{
if (!(this as Semicircle).PointLiesOn(inter1))
{
inter1 = null;
}
if (!(this as Semicircle).PointLiesOn(inter2))
{
inter2 = null;
}
}
if (!that.PointLiesOnAndBetweenEndpoints(inter1))
{
inter1 = null;
}
if (!that.PointLiesOnAndBetweenEndpoints(inter2))
{
inter2 = null;
}
if (inter1 == null && inter2 != null)
{
inter1 = inter2;
inter2 = null;
}
}
//
// Point is on the perimeter?
//
public override bool PointLiesOn(Point pt)
{
if (pt == null)
{
return(false);
}
// Radii
KeyValuePair <Segment, Segment> radii = theArc.GetRadii();
if (radii.Key.PointLiesOnAndBetweenEndpoints(pt) || radii.Value.PointLiesOnAndBetweenEndpoints(pt))
{
return(true);
}
// This point must lie on the circle in question, minimally.
if (!theArc.theCircle.PointLiesOn(pt))
{
return(false);
}
// Arc
if (theArc is MajorArc)
{
return(Arc.BetweenMajor(pt, theArc as MajorArc));
}
else if (theArc is MinorArc)
{
return(Arc.BetweenMinor(pt, theArc as MinorArc));
}
else if (theArc is Semicircle)
{
Semicircle semi = theArc as Semicircle;
// The point in question must lie on the same side of the diameter as the middle point
Segment candSeg = new Segment(pt, semi.middlePoint);
Point intersection = semi.diameter.FindIntersection(candSeg);
return(!candSeg.PointLiesOnAndBetweenEndpoints(intersection));
}
return(false);
}
public bool HasMajorSubArc(Arc arc)
{
return(Arc.BetweenMajor(arc.endpoint1, this) && Arc.BetweenMajor(arc.endpoint2, this));
}
public override bool PointLiesOn(Point pt)
{
return(Arc.BetweenMajor(pt, this));
}
