Version 5.0 The LEDA User Manual

void l.normalize( ) simplifies the homogenous representation
by calling point1 ( ).normalize( ) and
point2 ( ).normlize( ).
rat point l.point1( ) returns a point on l.
rat point l.point2( ) returns a second point on l.
rat segment l.seg( ) returns a segment on l.
bool l.is vertical( ) decides whether l is vertical.
bool l.is horizontal( ) decides whether l is horizontal.
bool
bool
l.intersection(const rat line& g, rat point& inter)
returns true if l and g intersect. In case of intersection
a common point is returned in inter.
l.intersection(const rat segment& s, rat point& inter)
returns true if l and s intersect. In case of intersection
a common point is returned in inter.
bool l.intersection(const rat segment& s)
returns true, if l and s intersect, false otherwise.
rat line
rat line
l.translate(const rational& dx, const rational& dy)
returns l translated by vector (dx, dy).
l.translate(integer dx, integer dy, integer dw)
returns l translated by vector (dx/dw, dy/dw).
rat line l.translate(const rat vector& v)
returns l translated by vector v.
Precondition: v.dim() = 2.
rat line l + const rat vector& v returns l translated by vector v.
rat line l − const rat vector& v returns l translated by vector −v.
rat line l.rotate90(const rat point& q, int i = 1)
rat line l.reflect(const rat point& p, const rat point& q)
returns l rotated about q by an angle of i × 90
degrees. If i > 0 the rotation is counter-clockwise
otherwise it is clockwise.
returns l reflected across the straight line passing
through p and q.