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Activities/Turtle Art (view source)
Revision as of 16:33, 26 February 2010
, 16:33, 26 February 2010→Looking under the hood
==Looking under the hood==
==Looking under the hood==
Turtle Art projects are stored as two files: (1) a .ta file contains a [http://docs.python.org/library/json.html json-encoded] serialization of the project; and (2) a .png file of the canvas.
Turtle Art projects are stored as a .ta file contains a [http://docs.python.org/library/json.html json-encoded] serialization of the project.
The json encoding of a repeat 4 forward 100 right 90 project:
The json encoding of a repeat 4 forward 100 right 90 project:
[[0,"repeat",331,158,[null,1,2,null]],[1,["number","4"],417,167,[0,null]],[2,"forward",426,207,[0,3,4]],[3,["number","100"],500,216,[2,null]],[4,"right",426,246,[2,5,null]],[5,["number","90"],500,255,[4,null]],[-1,"turtle",0,0,0,0,50,5]]
[[0,"repeat",331,158,[null,1,2,null]],[1,["number","4"],417,167,[0,null]],[2,"forward",426,207,[0,3,4]],[3,["number","100"],500,216,[2,null]],[4,"right",426,246,[2,5,null]],[5,["number","90"],500,255,[4,null]],[-1,"turtle",0,0,0,0,50,5]]
The basic structure of the encoding is a list of lists, where each block has these elements:
# block number
# block name or [block name, block value]
# x position (depreciated)
# y position (depreciated)
# list of connections to other blocks
Turtles are encoded at the end of the list:
# -1
# turtle or [turtle, turtle name]
# x position
# y position
# heading
# pen color
# pen shade
# pen width
==Programmable Brick==
==Programmable Brick==