Version 5.0 The LEDA User Manual

double r.direction( ) returns the direction of r.
double r.angle(const ray& s) returns the angle between r and s, i.e.,
s.direction() − r.direction().
bool r.is vertical( ) returns true iff r is vertical.
bool r.is horizontal( ) returns true iff r is horizontal.
double r.slope( ) returns the slope of the straight line underlying r.
Precondition: r is not vertical.
bool
bool
r.intersection(const ray& s, point& inter)
r.intersection(const segment& s, 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.
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.
ray r.translate by angle(double a, double d)
returns r translated in direction a by distance d.
ray
r.translate(double dx, double dy)
returns r translated by vector (dx, dy).
ray r.translate(const vector& v)
returns r translated by vector v
Precondition: v.dim() = 2.
ray r + const vector& v returns r translated by vector v.
ray r − const vector& v returns r translated by vector −v.
ray r.rotate(const point& q, double a)
returns r rotated about point q by angle a.
ray r.rotate(double a) returns r.rotate(point(0, 0), a).
ray r.rotate90(const point& q, int i = 1)
ray r.reflect(const point& p, const point& q)
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.