Regards the = object as an equation to be solved. It can determine the
value of a variable occuring only once in the equation if all other
variables are given. This facility is used by class spatial
to express spatial relations between graphical
objects. Below are some examples:
?- get(4+x=7, var, x, X) ==> X = 3
?- get(5*x=y, var, y, x=3, Y) ==> Y = 15
Note that x, y, w, h
and some more are the names of predefined
var objects and thus x
is translated to this var
object by PCE's type-checking system. The binding of the var
objects in an = object are not affected by this method.
See also class var
and class spatial.
- See also
- class spatial
