!Turtle (c) 1992 Linton Dawe.

!Turtle is a LOGO style turtle graphics system
designed for mathematical drawings and patterns.
Anyone familier with the concept of LOGO turtle
graphics should find this program fairly easy
to use. The commands it supports are:

FD x - Move forward x units.
BK x - Move backwards x units.
LT x - Turn x degrees to the left.
RT x - Turn x degrees to the right.

PU - Pen up.
PD - Pen down.

CS - Clear screen (wipe clean graphics area and
CENTRE).
CT - Clear text (wipe clean text area).
CENTRE - Move turtle to the centre of the screen &
pointing straight up the screen.

SETNIB x - Set nib colour to x (where x is a
standard BASIC colour number).

REPEAT x - Repeat a set of instructions x times
(you will be asked to type in the instructions
after typing in the REPEAT command - do not type
them as part of the command as you do in some LOGO
systems.)

SHOW <text> - Display the text string <text> in
the text area.

DEFINE <name> - Define an instruction with name
<name> to mean a certain sequence of instuctions.
Typing <name> will then cause the sequence to be
executed as if <name> was a built in command.
(N.B. DEFINEd instructions may not be used as part
of other DEFINEd instructions or in REPEATed
sequences, DEFINEd instructions are automatically
saved to disc in the !Turtle directory and loaded
when needed.)

DELETE <name> - Delete a DEFINEd instruction.

SAVE <name> - Save the current graphics area as a
sprite called <name> in the current directory.

*<command> - Execute the operating system command
<command> as if was typed from the f12 command
line.

QUIT, Q., EXIT, FINISH, STOP, LEAVE or BYE - Quit
from !Turtle (returns to the desktop).

This application is Public Domain and may be
freely copied as long as it is not sold for
profit and all the files remain intact and
unaltered.  If for any reason you should wish to
contact me I can be found at the following
address:

2 Crockers Wood Cottages,
Coldharbour,
Dorking,
Surrey,
RH5 6HE.

If you would like a copy of any P.D. programs I
have written then send a 1 coin (to cover p&p
etc.) and a blank disc to me at the above address
and I will send the disc back full of my
creations.

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This is version 1.10 of !Turtle.  It will now
operate without problems on RISC OS 3 machines.

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You may be interested to know that an enhanced
version of !Turtle (called !Turtle+) is now
available as part of The Liquid Data Art Pack.
Modifications since this version include:

Addition of FILL command to fill area with colour

Addition of PAINT command for simple colouring of
screen using the mouse

Addition of standard alternatives for some
keywords

Addition of full alternative command interpreter
to support a further 40+ alternatives to the
standard command set (including FORWARD, BACKWARD,
CLOCKWISE, ANTICLOCKWISE, INK, PENCOLOUR, COLOURIN
and many more) with ALTERNATIVES ON/OFF commands
to activate/deactivate.

Addition of separate !TurtleDir application for
easier storage of shapes and sprites

Many other minor alterations/improvements

The Liquid Data Art Pack costs just 10 and also
includes some of the easiest to use 256 colour art
software available on any machine.  You can obtain
The Art Pack directly from me at my home address -
the price of 10 is all inclusive, so order today!
Full details available on request.
