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POBugs drawing with turtle(python) using onkey() and dictionaries
 

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  1. POBugs drawing with turtle(python) using onkey() and dictionaries
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    <p>I decided redo this question as per advice I received, This is an assignment question I have been given for 1st year uni, python coding. I have bugs in my code and Can't figure out where to fix them. BUG 1 The turtle starts drawing when program is ran even though pen is up. BUG 2 undefined key such as 's, 7, tab' trigger space_bar function</p> <p>COLOURING BOOK</p> <p>In this task you create a children's colouring game in which given pictures can be coloured by tracing around a shape and then filling it. The controls are as follows.</p> <p>ARROW KEYS - Move the "brush" (turtle cursor) left, right, up or down by a fixed small amount.</p> <p>'z' - Undo the last step.</p> <p>'r', 'g', 'b' - Change the brush colour to red, green or blue, respectively. (You can define more colours if you like, but we expect at least these three.)</p> <p>SPACE BAR - Toggle the painting mode. In "move" mode, which is the initial mode, the "brush" (turtle) moves around the screen without drawing. In "paint" mode the brush leaves a coloured line as it moves. Most importantly, when the mode is changed from "paint" to "move", the area traced out by the brush is filled with colour.</p> <pre><code>from turtle import * from functools import partial bgpic("Colour_A_Turkey.gif") # change this to change the picture #control the accuracy/speed of the drawing step_size =8 pensize(4) penup() # whenever spacebar is pressed the current state and next state switch values current_state = penup next_state = pendown def space_bar(): global current_state, next_state next_state() current_state, next_state = next_state, current_state #if the current stat is penup fill in with current colour if current_state == penup: end_fill() else: begin_fill() onkey(space_bar, " ") # undo do a mistake function def mistake(): undo() onkey(mistake, "z") #using partial function to store the following functions #so they can be called as arguments from a dictionary #movement strait = partial(fd, step_size) reverse = partial(bk, step_size) turn_rt = partial(rt, step_size) turn_lf = partial(lt, step_size) #colour brow = partial(color, "brown") gree = partial(color, "green") yell = partial(color, "yellow") oran = partial(color, "orange") purp = partial(color, "purple") red = partial(color, "red") blue = partial(color, "blue") #create a dictionary to store all the keys and there abilities key_action = {"b" : blue, "r" : red, "p" : purp, "o" : oran,\ "y" : yell, "g" : gree, "w" : brow, "Right" : turn_rt , "Up" : strait,\ "Down" : reverse, "Left" : turn_lf, "z" : undo()} #when a key in then above dictionary #is pressed it's function is activated for pressed_key, activated_key in key_action.items(): onkey(activated_key, pressed_key) #make turtle look for key strokes with predefined function listen() #finish done() </code></pre>
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    1. COwhat do functions fd,bk,undo,rt,lt return you ?
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    2. COforward(x)/back(x)/undo last thing turtle did/right(x)/left(x). all predefined functions that come with turtle
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    3. COIS fixed now thanks everyone who helped, I defined z only once and changed " " to "space"
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