This is the command xpce that can be run in the OnWorks free hosting provider using one of our multiple free online workstations such as Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator
PROGRAM:
NAME
xpce - Prolog with graphical user interface (GUI)
SYNOPSIS
xpce prolog-option ...
DESCRIPTION
XPCE is a language independant library for GUI (Graphical User Interfaces). This manual
page discusses XPCE/Prolog: the combination of a Prolog environment and XPCE.
XPCE is an object-oriented engine that can have methods defined in various languages. XPCE
has about 150 predefined classes that deal mainly with GUI's. The object engine of XPE is
made available to Prolog using the following predicates:
Predicates:
new(?Ref, +Term)
Create an XPCE object from Term and bind the object to the reference Ref. The
functor-name of Term describes the class from which to create an instance. The
arguments of Term are used as initialisation arguments for the new object. If the
object was created successfully and Ref is a variable, Ref will be unified with the
term @<RefNumber>. If Ref is a term of the form @<Atom>, this term will serve as a
reference for the new object.
For example ?- new(@p, picture('Hello World'). Creates a graphical window object
with title "Hello World".
send(+Ref, +Selector, +Args...)
Ref is a reference to an existing XPCE object. Selector is the name of a
(send-)method defined on (the class of) this object and Args are terms that
describe arguments to be passed to the method.
send/[2-12] will convert the arguments to XPCE data objects, resolve the procedure
(C-function, Prolog predicate) implementing the method and run the implementation.
If the execution is successful, send succeeds, otherwise send fails.
For example ?- send(@p, open, point(400,100)). opens the picture created above at
position 400,100 on the display.
get(+Ref, +Selector, +Args ..., -Value)
Ref is a reference to an existing XPCE object. Selector is the name of a
(get-)method defined on (the class of) this object and Args are terms to provide
additional arguments. get/[3-13] works similar as send/[2-12] but returns a value
rather than succeeding/failing (boolean operation).
For example get(@p, height, H). Unifies H with the height of the graphical window.
free(+Ref)
If Ref is a reference to an XPCE object, invoke send(Ref, free). to the object.
Otherwise succeed silently.
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