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Line 57:
Line 57: − # Next, you need to define what your block will do:+ − # def_prim takes 3 arguments: the primitive name, the number of+ − # of arguments, 0 in this case, and the function to call, in this − # case, the canvas function to set the heading.
Activities/Turtle Art/Under the hood (view source)
Revision as of 12:38, 19 May 2011
, 12:38, 19 May 2011→Modifying Turtle Art
help_string=_('turns the turtle 180 degrees'))
help_string=_('turns the turtle 180 degrees'))
Next, you need to define what your block will do: def_prim takes 3 arguments: the primitive name, the number of arguments—0 in this case—and the function to call—in this case, the canvas.seth function to set the heading.
self.tw.lc.def_prim('uturn', 0,
self.tw.lc.def_prim('uturn', 0,
lambda self: self.tw.canvas.seth(self.tw.canvas.heading + 180))
lambda self: self.tw.canvas.seth(self.tw.canvas.heading + 180))