Chapter 4: Functions
In this chapter you are going to:
• learn about functions
• write your own functions
• create a number guessing game.
Chapter 5: MyEtchASketch
In this chapter you are going to:
• learn how to use the tkinter library
• make your own MyEtchASketch game
• learn how to put an application in its own window
• learn how to attach functions to keyboard presses.
# myEtchASketch application from Coding Club: Python Basics
# Note: the argument 'self' (in early editions of Python Basics) has been replaced by 'event'.
from tkinter import *
##### Set variables:
canvas_height = 400
canvas_width = 600
canvas_colour = "black"
p1_x=canvas_width/2
p1_y=canvas_height
p1_colour="green"
line_width=5
line_length=5
##### Functions:
# player controls
def p1_move_N(event):
global p1_y
canvas.create_line(p1_x, p1_y, p1_x, (p1_y-line_length), width=line_width, fill=p1_colour)
p1_y = p1_y - line_length
def p1_move_S(event):
global p1_y
canvas.create_line(p1_x, p1_y, p1_x, p1_y+line_length, width=line_width, fill=p1_colour)
p1_y = p1_y + line_length
def p1_move_E(event):
global p1_x
canvas.create_line(p1_x, p1_y, p1_x + line_length, p1_y, width=line_width, fill=p1_colour)
p1_x = p1_x + line_length
def p1_move_W(event):
global p1_x
canvas.create_line(p1_x, p1_y, p1_x - line_length, p1_y, width=line_width, fill=p1_colour)
p1_x = p1_x - line_length
def erase_all(event):
canvas.delete(ALL)
##### main:
window = Tk()
window.title("MyEtchaSketch")
canvas = Canvas(bg=canvas_colour, height=canvas_height, width=canvas_width, highlightthickness=0)
canvas.pack()
# bind movement to key presses
window.bind("<Up>", p1_move_N)
window.bind("<Down>", p1_move_S)
window.bind("<Left>", p1_move_W)
window.bind("<Right>", p1_move_E)
window.bind("u", erase_all)
window.mainloop()
################################################
################################################
################################################
'''
ryTurtleMouseKeyboard001.py
turtle 之 滑鼠、鍵盤控制。
'''
import random
from turtle import *
s= Screen()
t= Turtle()
def 點s(x,y):
print('點s()',x,y)
t.goto(x,y)
def 點t(x,y):
print('點t()',x,y)
def 拖t(x,y):
print('拖t()',x,y)
t.goto(x,y)
s.onclick(點s)
t.onclick(點t)
#t.ondrag(拖t) # 這行有時會當掉，還有待解決！
def 按a():
print('按a()')
t.clear()
def 按b():
print('按b()')
def 按c():
print('按c()')
def 按d():
print('按d()')
s.onkeypress(按a,'a')
s.onkeypress(按b,'b')
s.onkeypress(按c,'c')
s.onkeypress(按d,'d')
def 按上():
t.forward(100)
def 按下():
t.back(100)
def 按左():
t.left(90)
def 按右():
t.right(90)
s.onkeypress(按上,'Up')
s.onkeypress(按下,'Down')
s.onkeypress(按左,'Left')
s.onkeypress(按右,'Right')
s.listen()
s.mainloop()
