1 """
   2 Noticed this while reading wxpython-users maillist and found it too cool to not
   3 make a tkinter version. This is a partial version of the original one found in
   4 http://wiki.wxpython.org/BubblesToy
   5 """
   6 
   7 import Tkinter
   8 import random
   9 import math
  10 
  11 class Bubble(object):
  12     def __init__(self, canvas, x, y, death_size=25, color='green',
  13             grow_speed=0.2):
  14         self.x = x
  15         self.y = y
  16         self.radius = 5
  17         self.death_size = death_size
  18         self.grow_speed = grow_speed
  19         self.canvas = canvas
  20 
  21         self.bubble = self.canvas.create_oval(fill='white', outline=color,
  22             width=2, *self._bubble_coords())
  23 
  24     def _bubble_coords(self):
  25         r = self.radius
  26         return (self.x - r, self.y - r, self.x + r, self.y + r)
  27 
  28     def go(self, to_remove):
  29         if self.radius >= self.death_size:
  30             to_remove.append(self)
  31             self.canvas.delete(self.bubble)
  32 
  33     def update_drawing(self, to_remove):
  34         growth = math.log(self.radius) * self.grow_speed
  35         self.radius += growth
  36         self.canvas.coords(self.bubble, *self._bubble_coords())
  37         self.go(to_remove)
  38 
  39 
  40 class BubbleCanvas(Tkinter.Canvas):
  41     def __init__(self, master, *args, **kwargs):
  42         Tkinter.Canvas.__init__(self, master, *args, **kwargs)
  43         self.bubbles = []
  44         self.to_remove = []
  45         self.last_pos = (-1, -1)
  46 
  47         self.bind('<Motion>', self.on_motion)
  48         self.bind('<ButtonRelease-1>', self.on_left_up)
  49         self.bind('<ButtonRelease-3>', self.on_right_up)
  50 
  51     def draw(self):
  52         for bubble in self.bubbles:
  53             bubble.update_drawing(self.to_remove)
  54         while self.to_remove:
  55             self.bubbles.remove(self.to_remove.pop())
  56 
  57     def on_motion(self, event):
  58         x, y = event.x, event.y
  59         motion_score = abs(x - self.last_pos[0]) + abs(y - self.last_pos[1])
  60         self.last_pos = (x, y)
  61         if random.randint(0, motion_score) > 5:
  62             self.bubbles.append(Bubble(self, x, y))
  63             if random.randint(0, 100) == 0:
  64                 self.bubbles.append(Bubble(self, x, y, color='purple',
  65                      death_size=100, grow_speed=0.5))
  66 
  67     def on_left_up(self, event):
  68         self.bubbles.append(Bubble(self, event.x, event.y, color='yellow',
  69             death_size=50, grow_speed=0.1))
  70 
  71     def on_right_up(self, event):
  72         self.bubbles.append(Bubble(self, event.x, event.y, color='blue',
  73             death_size=80, grow_speed=0.6))
  74 
  75 
  76 class BubbleFrame(Tkinter.Frame):
  77     def __init__(self, title):
  78         Tkinter.Frame.__init__(self)
  79         self.master.title(title)
  80 
  81         self.canvas = BubbleCanvas(self, background='white')
  82         self.canvas.pack(expand=True, fill='both')
  83         self.after(20, self.on_timer)
  84 
  85     def on_timer(self):
  86         self.canvas.draw()
  87         self.after(20, self.on_timer)
  88 
  89 
  90 root = Tkinter.Tk()
  91 frame = BubbleFrame("Bubbles!")
  92 frame.pack(expand=True, fill='both')
  93 root.mainloop()
  94