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-
- Tcl for Pd
- ==========
-
-this library allows you to to write externals for Pd using the
-Tcl language.
-The API is the standard pd C API, so if you wrote an external in C in
-the past, you know where to start.
-(Otherwise you can read the Pd-External-HOWTO)
-
-
- The client/server thing
- =======================
-
-Pd is split into two processes: the gui, and the core.
-A pd external with no gui generally just runs in the core.
-A pd gui external is split in two pieces: the gui and the non-gui part.
-The non-gui part actually makes audio/file IO, while the gui part is
-just a frontend to the non-gui one, displaying its state, and allowing
-the user to interact with it.
-
-Tclpd runs the Tcl code in the core process.
-
-You might have been familiar with tot/toxy/widget externals.
-Such externals run in the gui process (client). That was fine for writing
-gui only external, but, for instance, you cannot do a metronome or
-anything which is timing accurate, or heavy IO, as that is not the
-purpose of the gui process.
-
-Theoretically, Tclpd could also do gui stuff. Communication to the gui
-is done with the sys_vgui proc (communication in the opposite directions
-is done via pd message and receivers).
-Just I didn't design a framework for doing this, so it's up to you.
-
-
- Data conversion between Tcl <=> Pd
- ==================================
-
-In pd exists 'atoms'. An atom is a float, a symbol, a list item,
-and such.
-Tcl does not have data types. In Tcl everything is a string,
-also numbers and lists. Just when something needs to be read as
-number, then evaluation comes in.
-This leads to loss of information about atom types. Imagine a
-symbol '456' comes into tclpd, you won't know anymore if "456"
-is a symbol or a float.
-
-Here a little convention comes in action: in tclpd an atom gets
-converted to a two-item list, where first item is atom type,
-and second item is its value.
-
-Some examples of conversion:
-
- Pd:  456
- Tcl: {float 456}
-
- Pd:  symbol foo
- Tcl: {symbol foo}
-
- Pd:  list cat dog 123 456 weee
- Tcl: {{symbol cat} {symbol dog} {float 123} {float 456} {symbol wee}}
-
-
- Examples
- ========
-
-I provided small examples.
-after loading pd with option '-lib tcl', just type the filename
-(minus the .tcl extension) to load the Tcl externals examples.
-
-actually there is one simple example: list_change (behaves like
-[change] object, but work with lists only)
-
-examples make use of pdlib.tcl, a little API I wrote to make
-things more cute.
-you are free to not use it (just look in pdlib.tcl to know what
-happens for real) or better: YOU ARE ENCOURAGED to write an OOP
-system for writing externals with tclpd.
-
-
- Authors
- =======
-
- * Federico Ferri <mescalinum@gmail.com>
- * Mathieu Bouchard <matju@artengine.ca>
-
-
- License
- =======
-
-See COPYING file provided with the package.
-
-