Version 5.0 The LEDA User Manual

eal 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.
real r.slope( ) returns the slope of the straight line underlying r.
Precondition: r is not vertical.
bool
bool
real ray
r.intersection(const real ray& s, real point& inter)
if r and s intersect in a single point this point is
assigned to inter and the result is true, otherwise
the result is false.
r.intersection(const real segment& s, real point& inter)
r.translate(real dx, real dy)
if r and s intersect in a single point this point is
assigned to inter and the result is true, otherwise
the result is false.
returns r translated by vector (dx, dy).
real ray r.translate(const real vector& v)
returns r translated by vector v
Precondition: v.dim() = 2.
real ray r + const real vector& v returns r translated by vector v.
real ray r − const real vector& v returns r translated by vector −v.
real ray r.rotate90(const real point& q, int i = 1)
real ray r.reflect(const real point& p, const real point& q)
real ray r.reflect(const real 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.
returns r reflected across point p.
real ray r.reverse( ) returns r reversed.
bool r.contains(const real point& )
bool r.contains(const real segment& )
decides whether r contains p.
decides whether r contains s.