Changes

'''Note:''' As of Version 106, there is also support for plugins. If you can use the plugin mechanism to add support for additional devices, e.g., Arduino, or for making modifications such as are described below without making changes to the standard code base. (The advantage to the latter is that your changes will remain intact even after you upgrade to a newer version.)

'''Note:''' As of Version 106, there is also support for plugins. If you can use the plugin mechanism to add support for additional devices, e.g., Arduino, or for making modifications such as are described below without making changes to the standard code base. (The advantage to the latter is that your changes will remain intact even after you upgrade to a newer version.)

taconstants.py contains the constants that by-in-large determine the behavior of Turtle Art. Notably, the block palettes are defined below. If you want to add a new block to Turtle Art, it is generally a matter of modifying some tables below and then adding the primitive to talogo.py. For example, if we want to add a new turtle command, 'uturn', we'd make the following changes:

The tabasics.py file contains the constants that by-in-large determine the behavior of Turtle Art. Notably, the block palettes are defined

below. If you want to add a new block to Turtle Art, you could simply add a block of code to that file or to turtle_block_plugin.py,

which contains additional blocks. (Even better, write your own plugin!!)

(1) We'd add 'uturn' to the PALETTES list of lists:

    palette = make_palette('mypalette',  # the name of your palette

                          help_string=_('Palette of my custom commands'))

PALETTES = [['forward', 'back', 'clean', 'left', 'right', 'show',  

For example, if we want to add a new turtle command, 'uturn', we'd use the

              'seth', 'setxy', 'heading', 'xcor', 'ycor', 'setscale',

              'arc', 'scale', 'left', 'top', 'right', 'bottom', 'uturn'],

    palette.add_block('uturn', # the name of your block

            ['penup','pendown', 'setpensize', 'fillscreen', 'pensize',...

                      style='basic-style', # the block style

                      label=_('u turn'), # the label for the block

                      prim_name='uturn', # code reference (see below)

                      help_string=_('turns the turtle 180 degrees'))

(2) Then we'd add it to one of the block-style definitions. Since it takes

    # Next, you need to define what your block will do:

no arguments, we'd add it here:

    # def_prim takes 3 arguments: the primitive name, the number of

    # of arguments, 0 in this case, and the function to call, in this

    self.tw.lc.def_prim('uturn', 0,

        lambda self: self.tw.canvas.seth(self.tw.canvas.heading + 180))

BASIC_STYLE = ['clean', 'penup', 'pendown', 'stack1', 'stack2', 'vspace',

That's it. When you next run Turtle Art, you will have a 'uturn' block on the 'mypalette' palette.

    'hideblocks', 'showblocks', 'clearheap', 'printheap', 'kbinput', 'uturn']

You will have to create icons for the palette-selector buttons. These

are kept in the icons subdirectory. You need two icons:

mypaletteoff.svg and mypaletteon.svg, where 'mypalette' is the same

string as the entry you used in instantiating the Palette class. Note

 

that the icons should be the same size (55x55) as the others. (This is

the default icon size for Sugar toolbars.)

 

 

 

 

 

 

 

 

 

Adding a new palette is simply a matter of: (1) adding an additional entry to PALETTE_NAMES; (2) new list of blocks to PALETTES; and (3) an additional entry in COLORS. However you will have to: (4) create icons for the palette-selector buttons. These are kept in the icons subdirectory. You need two icons: yourpalettenameoff.svg and yourpalettenameon.svg, where yourpalettename is the same string as the entry you added to the PALETTE_NAMES list. Note that the icons should be the same size (55x55) as the others. This is the default icon size for Sugar toolbars.