Tux's Turtle

Issuing Commands

You may do one of the following:

Press the key for a command (with our without [Shift] or [Control] modifiers)
Enter a number (a series of one or more numeric digits — [0] through [9]), followed by a command you wish to repeate more than once
Press the key for a command multiple times (the same as asking to repeat the command that many times; e.g., "[R] [R] [R]" is recorded as "[3] [R]")
Press [Backspace] to undo the previous command (if repeated, it undoes one iteration; e.g., "[3] [R]" becomes "[2] [R]")
Press [Shift]+[Backspace] to undo all iterations of the previous command
For commands that require labels ("Start Subroutine" and "Go To Subroutine"):
- Enter between 1 and 16 alphanumeric characters ([A] through [Z] and [0] through [9]) to use as the label
- Press [Backspace] to delete the previous character; if no characters are left, the command itself ("Start" or "Go To") is revoked
- Press [Shift]+[Backspace] to delete all characters, if any (so that you may start over)
- Press [Enter] to accept the label

Command Overview

Repeatable?	Modifiers?	Key	Label?	Name	Description	Without modifiers	With [Shift]	With [Control]
#	mod	D		Draw	Moves turtle and draws a line in the current color	30 units	15 units	1 unit
#	mod	M		Move	Moves turtle	30 units	15 units	1 unit
#	mod	W		Wipe	Moves turtle and draws a line in the background color	30 units	15 units	1 unit
#	mod	R		Right	Rotates turtle right (clockwise).	30 degress	15 degrees	1 degree
#	mod	L		Left	Rotates turtle left (counter clockwise).	30 degress	15 degrees	1 degree
		F		Flip	Flips turtle (rotates turtle 180 degrees)
		B		Back Home	Moves turtle back to home position (center of screen), inital heading (up, aka north), initial color (white), initial size, and with no horizontal or vertical mirroring.
		P		Pour Bucket	Flood-fills the picture starting at the turtle's current position.
#	mod	C		Color Cycle	Changes the color used when drawing or pouring the bucket.	Cycle 12 hues (no brightness change)	Cycle 4 brightnesses (no hue change)
#		I		Zoom In	Increases the size of the turtle, and the scale of its movements when drawing, moving and wiping.
#		O		Zoom Out	Increases the size of the turtle, and the scale of its movements when drawing, moving and wiping.
		H		Horizontal Mirror	Actives a mirror-image turtle that moves and draws on the opposite horizontal side of the screen.
		V		Vertical Mirror	Actives a mirror-image turtle that moves and draws on the opposite vertical side of the screen.
		T		Show/Hide Turtle	Causes the turtle cursor to disappear from, or reappear on, the canvas.
		S	label	Start Subroutine	Initiates the beginning of a subroutine. A "thought bubble" with a miniature canvas and turtle will appear. Type the label for the subroutine and press [Enter], type the commands to be executed (which will be acted out within the "thought bubble"), and end it with the End Subroutine command.
		E		End Subroutine	Marks the end of the current subroutine. The "thought bubble" that appeared will be dismissed and any further commands will be acted out immediately, by the normal turtle.
#		G	label	Go To Subroutine	Executes the commands described by a previously-defined subroutine.

Limitations and Known Issues:

(As of 2009.12.01)

There is currently no way to view the current program in the main window. Press [Tab] and it will be written to STDOUT.
There is no way to save the current program, or load another.
Some command sequences can take a long time; press [Escape] or close the application window to abort. (If using [Escape], your program will be in an undefined state)
There are glitches that can occur with [S] and [G] commands (which use labels)
You shouldn't be able to call a subroutine recursively, but you probably can
You shouldn't be able to call a subroutine that is defined later, but you probably can
There are probably other subroutine-related glitches
The flood fill (used by "Pour Bucket" command) is implemented poorly (slow; eats up stack space)
Tux the penguin is nowhere to be found!

Tux's Turtle

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Issuing Commands

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