Version 5.0 The LEDA User Manual

ool
GW.set post rotate handler(GeoEditScene ∗ sc, F handler)
sets the handler that is called after every
rotate operation. handler must have type
void (∗handler)(GeoWin&, const T :: value type&,
double x, double x, double a).
template
bool GW.set end change handler(GeoEditScene ∗ sc, F handler)
sets the handler that is called when a geometric object
from (∗sc) ends changing. handler gets the object
as the second parameter. handler must have type
void (∗handler)(GeoWin&, const T :: value type &).
Generator functions: The following operation can be used to set a generator function
for an edit scene. The operation uses member templates. If your compiler does not support
member templates, you should use instead the templated function geowin set generate fcn.
template
bool GW.set generate fcn(GeoEditScene ∗ sc, void (∗f)(GeoWin& gw,
T & L))
sets the generator function for edit scene (∗sc). The
function gets the GeoWin where (∗sc) belongs to and
a reference to the container L of (∗sc). The function
should write the generated objects to L.
Editing of objects in a scene: It is possible to edit single objects in an editable scene.
For this purpose an edit object - function can be set for editable scenes. This function has
type
void (∗f)(GeoWin& gw, T & obj , int nr)
where gw is the GeoW in-object where the scene belongs to, obj is a reference to the
object that will be edited and nr is the edit mode of the scene.
template
bool GW.set edit object fcn(GeoEditScene ∗ sc, T2 f)
sets the edit object - function of scene sc to f.
template
void∗ GW.get edit object fcn(GeoEditScene ∗ sc)
Transformation objects:
returns the edit object - function of scene sc .
GeoWin supports affine transformations of selected objects in editable scenes for the
LEDA rat- and float-kernel classes. The used transformation classes are rat transform
and transform respectively. The following class templates can be used to instantiate
transformation objects. They are derived from type geowin transform.