internal double GetClosestPoint(Point2d point, Line2d line, ref bool start)
{
if (line == null)
{
return(Double.PositiveInfinity);
}
double distance = new Vector2d(line.StartPoint, point).Length;
start = true;
double endDistance = new Vector2d(line.EndPoint, point).Length;
if (endDistance < distance)
{
start = false;
distance = endDistance;
}
return(distance);
}
public static Value FromLine2d(GridBasis basis, int ordinal, Line2d line, bool snap)
{
PointAxis2d.Value p0 = PointAxis2d.Value.FromPoint2d(basis, ordinal, line.StartPoint, snap);
if (p0 == null)
{
return(null);
}
PointAxis2d.Value p1 = PointAxis2d.Value.FromPoint2d(basis, ordinal, line.EndPoint, snap);
if (p1 == null)
{
return(null);
}
if (p0.Abscissa != p1.Abscissa)
{
return(null);
}
return(new Value(p0.Abscissa, new Range1d(p0.Ordinate, p1.Ordinate)));
}
public Point2d Intersect(Line2d line, bool clip, bool allowOneFail)
{
Vector2d p = new Vector2d(m_start);
Vector2d q = new Vector2d(line.StartPoint);
Vector2d r = new Vector2d(p, m_end);
Vector2d s = new Vector2d(q, line.EndPoint);
double rxs = r.Cross(s);
// Parallel (could be collinear)
if (rxs.IsZero())
{
return(null);
}
double t = q.Subtract(p).Cross(s) / rxs;
if (clip)
{
bool tFail = (t.CompareLess(0) || t.CompareGreater(1));
if (tFail && !allowOneFail)
{
return(null);
}
double u = q.Subtract(p).Cross(r) / rxs;
bool uFail = (u.CompareLess(0) || u.CompareGreater(1));
if (uFail && !allowOneFail)
{
return(null);
}
if (allowOneFail && tFail && uFail)
{
return(null);
}
}
return(p.Add(r.Scale(t)));
}
internal Line2d Join(Line2d current)
{
if (m_start.Compare(current.StartPoint))
{
return(new Line2d(current.EndPoint, m_end));
}
if (m_end.Compare(current.StartPoint))
{
return(new Line2d(current.EndPoint, m_start));
}
if (m_start.Compare(current.EndPoint))
{
return(new Line2d(current.StartPoint, m_end));
}
if (m_end.Compare(current.EndPoint))
{
return(new Line2d(current.StartPoint, m_start));
}
return(null);
}
internal Line2d(Line2d other)
{
m_start = new Point2d(other.StartPoint);
m_end = new Point2d(other.EndPoint);
}
public Point2d Intersect(Line2d line, bool clip = false)
{
return(Intersect(line, clip, false));
}
internal Point2d GetPoint(Line2d line, bool start)
{
return(start ? line.StartPoint : line.EndPoint);
}
