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gs(3erl)			     Erlang Module Definition				 gs(3erl)

       gs - The Graphics System for Erlang.

       GS  is  not  recommended for use in new applications. Instead we recommend WX for applica-
       tions that need a graphical user interface.

       GS is not maintained and we plan to deprecate and remove it from the distribution as  soon
       as possible, maybe already in the next major release (R15).

       The  Graphics  System,  GS, is easy to learn and designed to be portable to many different

       In the description below, the type gsobj() denotes a reference to a graphical object  cre-
       ated  with GS. Such a reference is either a GS object identifier or the name of the object
       (an atom), if such a name exists.  The  functions  all  return  the  specified  values  or
       {error,Reason} if an error occurs.

       Please  refer  to  the GS User's Guide for a description of the different object types and
       possible options.

       config(GSObj, Options) -> ok

	      Types  GSOBj = gsobj()
		     Options = [Option] | Option
		     Option = {Key,Value}

	      Configures a graphical object according to the specified options.

       create(ObjType, Parent) -> ObjId
       create(ObjType, Parent, Options) -> ObjId
       create(ObjType, Name, Parent, Options) -> ObjId

	      Types  ObjType = atom()
		     Parent = gsobj()
		     Name = atom()
		     Options = [Option] | Option
		     Option = {Key,Value}

	      Creates a new graphical object of the specified type as a child  to  the	specified
	      parent object. The object is configured according to the options and its identifier
	      is returned. If no options are provided, default option values are used.

	      If a name is provided, this name can be used to reference the object instead of the
	      object identifier. The name is local to the process which creates the object.

	      The  following  object  types  exist: window | button | radiobutton | checkbutton |
	      label | frame | entry | listbox | canvas | arc | image | line | oval  |  polygon	|
	      rectangle  | text | menubar | menubutton | menu | menuitem | grid | gridline | edi-
	      tor | scale

       create_tree(Parent, Tree) -> ok

	      Types  Parent = gsobj()
		     Tree = [Object]
		     Object   =    {ObjType,Options}	|    {ObjType,Options,Tree}    |    {Obj-

	      Creates a hierarchy of graphical objects.

       destroy(GSObj) -> void()

	      Types  GSObj = gsobj()

	      Destroys a graphical object and all its children.

       ObjType(Parent, Options)
       ObjType(Name, Parent, Options)

	      These  functions	are shorthand equivalents of create/2 , create/3 , and create/4 ,

       read(GSObj, Key) -> Value

	      Types  GSObj = gsobj()
		     Key = atom()
		     Value = term()

	      Returns the value of an option key for the specified graphical object.

       start() -> ObjId

	      Starts GS, unless it is already started, and returns its object identifier.

       stop() -> void()

	      Stops GS and closes all windows. This function is not the opposite of start/0 as it
	      will cause all applications to lose their GS objects.

Ericsson AB				    gs 1.5.13					 gs(3erl)
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