diff options
Diffstat (limited to 'pysamples/dotted_line.py')
| -rw-r--r-- | pysamples/dotted_line.py | 136 |
1 files changed, 59 insertions, 77 deletions
diff --git a/pysamples/dotted_line.py b/pysamples/dotted_line.py index 9db7f9d..febd409 100644 --- a/pysamples/dotted_line.py +++ b/pysamples/dotted_line.py @@ -1,42 +1,23 @@ -#Copyright (c) 2009-10, Walter Bender +#Copyright (c) 2009-11, 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. 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 @@ -44,72 +25,72 @@ # 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) -# +# tamyblock.py, tw is the class instance) +# # Methods and data attributes Example -# set_fullscreen(self) lc.tw.set_fullscreen() +# set_fullscreen(self) tw.set_fullscreen() # Note: Hides the Sugar toolbar -# set_cartesian(self, flag) lc.tw.set_cartesian(True) +# set_cartesian(self, flag) tw.set_cartesian(True) # Note: True will make the overlay visible; # False will make it invisible -# set_polar(self, flag) lc.tw.set_polar(True) +# set_polar(self, flag) tw.set_polar(True) # Note: True will make the overlay visible; # False will make it invisible -# hideshow_button(self, flag) lc.tw.hideshow_button() +# hideshow_button(self, flag) tw.hideshow_button() # Note: Toggles visibility of blocks and palettes -# self.active_turtle lc.tw.active_turtle +# self.active_turtle 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) -# +# tamyblock.py, tw.canvas is the class instance) +# # Methods and data attributes Example -# clearscreen(self) lc.tw.canvas.clearscreen() +# clearscreen(self) tw.canvas.clearscreen() # Note: Clears the screen and resets all turtle and # pen attributes to default values -# setpen(self, flag) lc.tw.canvas.setpen(True) +# setpen(self, flag) tw.canvas.setpen(True) # Note: True will set the pen "down", enabling drawing; # False will set the pen "up" -# forward(self, n) lc.tw.canvas.forward(100) +# forward(self, n) tw.canvas.forward(100) # Note: Move the turtle forward 100 units -# arc(self, a, r) lc.tw.canvas.arc(120, 50) +# arc(self, a, r) tw.canvas.arc(120, 50) # Note: Move the turtle along an arc of 120 degrees # (clockwise) and radius of 50 units -# setheading(self, a) lc.tw.canvas.setheading(180) +# setheading(self, a) tw.canvas.setheading(180) # Note: Set the turtle heading to 180 # (towards the bottom of the screen) -# self.heading lc.tw.canvas.heading +# self.heading tw.canvas.heading # Note: The current heading -# setpensize(self, n) lc.tw.canvas.setpensize(25) +# setpensize(self, n) tw.canvas.setpensize(25) # Note: Set the turtle pensize to 25 units -# self.pensize lc.tw.canvas.pensize +# self.pensize tw.canvas.pensize # Note: The current pensize -# setcolor(self, c) lc.tw.canvas.color(70) +# setcolor(self, c) tw.canvas.color(70) # Note: Set the pen color to 70 (blue) -# self.color lc.tw.canvas.color +# self.color tw.canvas.color # Note: The current pen color -# setshade(self, s) lc.tw.canvas.shade(50) +# setshade(self, s) tw.canvas.shade(50) # Note: Set the pen shade to 50 -# self.shade lc.tw.canvas.shade +# self.shade tw.canvas.shade # Note: The current pen shade -# fillscreen(self, c, s) lc.tw.canvas.fillscreen(70, 90) +# fillscreen(self, c, s) tw.canvas.fillscreen(70, 90) # Note: Fill the screen with color 70, shade 90 (light blue) -# setxy(self, x, y) lc.tw.canvas.setxy(100,100) +# setxy(self, x, y) tw.canvas.setxy(100,100) # Note: Move the turtle to position (100, 100) -# self.xcor lc.tw.canvas.xcor +# self.xcor tw.canvas.xcor # Note: The current x coordinate of the turtle # (scaled to current units) -# self.ycor lc.tw.canvas.ycor +# self.ycor tw.canvas.ycor # Note: The current y coordinate of the turtle # (scaled to current units) -# self.set_turtle(name) lc.tw.canvas.set_turtle(1) +# self.set_turtle(name) 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 @@ -118,34 +99,35 @@ # Note: See http://docs.python.org/library/math.html # from time import localtime localtime().tm_hour returns the current hour # Note: See http://docs.python.org/library/time.html -# lc.heap.append(data) adds data to the heap +# tw.lc.heap.append(data) adds data to the heap # Note: See http://docs.python.org/tutorial/datastructures.html -# data = lc.heap.pop(-1) pops data off the heap +# data = tw.lc.heap.pop(-1) pops data off the heap # Note: See http://docs.python.org/tutorial/datastructures.html # -def myblock(lc, x): +# Usage: Import this code into a Python (user-definable) block; when +# this code is run, the turtle will draw a dotted line of the length +# of the numeric argument block docked to the Python block. + - ########################################################################### - # - # Draw a dotted line of length x. - # - ########################################################################### +def myblock(tw, line_length): + ''' 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: + if tw.canvas.pendown: dist = 0 - while dist+lc.tw.canvas.pensize < x: # 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.setpen(True) + while dist + tw.canvas.pensize < line_length: # repeat drawing dots + tw.canvas.setpen(True) + tw.canvas.forward(1) + tw.canvas.setpen(False) + tw.canvas.forward((tw.canvas.pensize * 2) - 1) + dist += (tw.canvas.pensize * 2) + # make sure we have moved exactly line_length + tw.canvas.forward(line_length - dist) + tw.canvas.setpen(True) else: - lc.tw.canvas.forward(x) + tw.canvas.forward(line_length) return |