Version 5.0 The LEDA User Manual

GEN POLYGON P (const POLYGON & p,
CHECK TYPE check = WEAKLY SIMPLE,
RESPECT TYPE respect orientation =
RESPECT ORIENTATION );
introduces a variable P of type GEN POLYGON . P is initialized
to the polygonal region with boundary p. If respect orientation is
DISREGARD ORIENTATION, the orientation is chosen such P is
bounded.
Precondition: p must be a weakly simple polygon. If check is set
appropriately this is checked.
GEN POLYGON
P (const list& pl,
CHECK TYPE check = GEN POLYGON :: WEAKLY SIMPLE ,
RESPECT TYPE respect orientation =
RESPECT ORIENTATION );
introduces a variable P of type GEN POLYGON . P is initialized to
the polygon with vertex sequence pl. If respect orientation is DIS-
REGARD ORIENTATION, the orientation is chosen such that P
is bounded.
Precondition: If check is SIMPLE, pl must define a simple polygon,
and if check is WEAKLY SIMPLE, pl must define a weakly
simple polygon. If no test is to performed, the second argument
has to be set to NO CHECK. The three constants NO CHECK,
SIMPLE, and WEAKLY SIMPLE are part of a local enumeration
type CHECK TYPE.
GEN POLYGON
P (const list& PL,
CHECK TYPE check = CHECK REP);
introduces a variable P of type GEN POLYGON . P is initialized
to the polygon with boundary representation PL.
Precondition: PL must be a boundary representation. This conditions
is checked if check is set to CHECK REP.
GEN POLYGON
P (const list& PL);
introduces a variable P of type GEN POLYGON . P is initialized
to the union of all generalized polygons in PL.
GEN POLYGON
P (const gen polygon& Q, int prec = rat point :: default precision);
introduces a variable P of type GEN POLYGON . P is initialized
to a rational approximation of the (floating point) polygon Q of
coordinates with denominator at most prec. If prec is zero, the
implementation chooses prec large enough such that there is no
loss of precision in the conversion