Version 5.0 The LEDA User Manual

at point r.source( ) returns the source of r.
rat point r.point1( ) returns the source of r.
rat point r.point2( ) returns a point on r different from r.source( ).
bool r.is vertical( ) returns true iff r is vertical.
bool r.is horizontal( ) returns true iff r is horizontal.
bool
bool
rat ray
rat ray
r.intersection(const rat ray& s, rat point& inter)
returns true if r and s intersect. If so, a point of
intersection is returned in inter.
r.intersection(const rat segment& s, rat point& inter)
r.translate(const rational& dx, const rational& dy)
r.translate(integer dx, integer dy, integer dw)
returns true if r and s intersect. If so, a point of
intersection is returned in inter.
returns r translated by vector (dx, dy).
returns r translated by vector (dx/dw, dy/dw).
rat ray r.translate(const rat vector& v)
returns r + v, i.e., r translated by vector v.
Precondition: v.dim() = 2.
rat ray r + const rat vector& v returns r translated by vector v.
rat ray r − const rat vector& v returns r translated by vector −v.
rat ray r.rotate90(const rat point& q, int i = 1)
rat ray r.reflect(const rat point& p, const rat point& q)
rat ray r.reflect(const rat point& p)
returns r rotated about q by an angle of i × 90
degrees. If i > 0 the rotation is counter-clockwise
otherwise it is clockwise.
returns r reflected across the straight line passing
through p and q.
Precondition: p ≠ q.
returns r reflected across point p.
rat ray r.reverse( ) returns r reversed.
bool r.contains(const rat point& p)
decides whether r contains p.