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#Copyright (c) 2011, Walter Bender
#Permission is hereby granted, free of charge, to any person obtaining a copy
#of this software and associated documentation files (the "Software"), to deal
#in the Software without restriction, including without limitation the rights
#to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
#copies of the Software, and to permit persons to whom the Software is
#furnished to do so, subject to the following conditions:
#The above copyright notice and this permission notice shall be included in
#all copies or substantial portions of the Software.
#THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
#IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
#FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
#AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
#LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
#OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
#THE SOFTWARE.
#
# This procedure is invoked when the user-definable block on the "extras"
# palette is selected.
# Usage: Import this code into a Python (user-definable) block; when
# it is run, a u-turn block will be added to the Turtle Palette. You
# can use the u-turn block as you would any other block.
def myblock(tw, arg):
''' Add a uturn block to the 'turtle' palette '''
from TurtleArt.tapalette import make_palette, palette_name_to_index
from TurtleArt.talogo import primitive_dictionary
from gettext import gettext as _
# Choose a palette for the new block.
palette = make_palette('turtle')
# Create a new block prototype.
palette.add_block('uturn',
style='basic-style-extended-vertical',
label=_('uturn'),
prim_name='uturn',
help_string=_('make a uturn'))
# Add its primitive to the LogoCode dictionary.
tw.lc.def_prim('uturn', 0,
lambda self: primitive_dictionary['set'](
'heading', tw.canvas.seth, tw.canvas.heading + 180))
# Regenerate the palette, which will now include the new block.
tw.show_toolbar_palette(palette_name_to_index('turtle'),
regenerate=True)
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