diff options
Diffstat (limited to 'pysamples/dotted_line.py')
| -rw-r--r-- | pysamples/dotted_line.py | 46 |
1 files changed, 24 insertions, 22 deletions
diff --git a/pysamples/dotted_line.py b/pysamples/dotted_line.py index 9db7f9d..86d5c7f 100644 --- a/pysamples/dotted_line.py +++ b/pysamples/dotted_line.py @@ -22,21 +22,21 @@ # This procedure is invoked when the user-definable block on the "extras" # palette is selected. Some examples of how to use this block are included # below. Try uncommenting an example or write your own Python code. -# +# # To uncomment code, remove the '# ' in the Python code. Take care to preserve # the proper indentations. # -# +# # NOTES: -# +# # Turtle Art is created in object oriented Python code. This is based # around the definition of classes and the creation of object(s) which # are instance(s) of that class. These objects then have properties and # methods which are defined by their class. -# +# # See http://docs.python.org/tutorial/classes.html for a description of # classes in Python. -# +# # Class Defined in Instance Created in # TurtleArtWindow tawindow.py tw TurtleArtActivity.py # LogoCode talogo.py lc tawindow.py @@ -44,11 +44,11 @@ # Turtles, Turtle taturtle.py turtles tawindow.py, # tacanvas.py # Blocks, Block tablock.py block_list tawindow.py -# -# +# +# # Class TurtleArtWindow -- useful properties and methods (from within # tamyblock.py, lc.tw is the class instance) -# +# # Methods and data attributes Example # set_fullscreen(self) lc.tw.set_fullscreen() # Note: Hides the Sugar toolbar @@ -62,11 +62,11 @@ # Note: Toggles visibility of blocks and palettes # self.active_turtle lc.tw.active_turtle # Note: The active turtle instance -# -# +# +# # Class TurtleGraphics -- useful properties and methods (from within # tamyblock.py, lc.tw.canvas is the class instance) -# +# # Methods and data attributes Example # clearscreen(self) lc.tw.canvas.clearscreen() # Note: Clears the screen and resets all turtle and @@ -108,8 +108,8 @@ # (scaled to current units) # self.set_turtle(name) lc.tw.canvas.set_turtle(1) # Note: Set the current turtle to turtle '1' -# -# +# +# # Other useful Python functions # Module Example # from math import pow pow(2,3) returns 2 to the 3rd power @@ -124,28 +124,30 @@ # Note: See http://docs.python.org/tutorial/datastructures.html # -def myblock(lc, x): + +def myblock(lc, line_length): ########################################################################### # - # Draw a dotted line of length x. + # Draw a dotted line of length line_length. # ########################################################################### - try: # make sure x is a number - x = float(x) + try: # make sure line_length is a number + line_length = float(line_length) except ValueError: return if lc.tw.canvas.pendown: dist = 0 - while dist+lc.tw.canvas.pensize < x: # repeat drawing dots + while dist + lc.tw.canvas.pensize < line_length: # repeat drawing dots lc.tw.canvas.setpen(True) lc.tw.canvas.forward(1) lc.tw.canvas.setpen(False) - lc.tw.canvas.forward((lc.tw.canvas.pensize*2)-1) - dist += (lc.tw.canvas.pensize*2) - lc.tw.canvas.forward(x-dist) # make sure we have moved exactly x + lc.tw.canvas.forward((lc.tw.canvas.pensize * 2) - 1) + dist += (lc.tw.canvas.pensize * 2) + # make sure we have moved exactly line_length + lc.tw.canvas.forward(line_length - dist) lc.tw.canvas.setpen(True) else: - lc.tw.canvas.forward(x) + lc.tw.canvas.forward(line_length) return |