1#!/usr/bin/env ruby
2
3require 'tk'
4require 'tkextlib/vu/pie'
5
6pie = Tk::Vu::Pie.new(:label=>"My Revolving Budget"){
7  itemconfigure('Welfare',   :value=>3.004)
8  itemconfigure('Military',  :value=>7.006)
9  itemconfigure('Transport', :value=>1.6, :explode=>15)
10  itemconfigure('Parks',     :value=>0.9)
11  itemconfigure('Schools',   :value=>2)
12  itemconfigure('Debt',      :value=>4,   :explode=>10)
13
14  configure(:angle=>10, :origin=>90, :shadow=>10)
15}
16
17spin = TkTimer.new(60, -1, proc{|obj|
18  pie.configure(:origin=>pie[:origin] + 1)
19})
20
21f = TkFrame.new
22fast_btn = TkButton.new(f, :text=>"Spin Faster", :command=>proc{spin.start})
23slow_btn = TkButton.new(f, :text=>"Spin Slower", :command=>proc{spin.stop})
24quit_btn = TkButton.new(f, :text=>"Exit", :command=>proc{exit})
25
26Tk.grid(pie, :sticky=>:news)
27Tk.grid(f, :sticky=>:ew)
28
29Tk.pack(fast_btn, slow_btn, quit_btn,
30        :in=>f, :side=>:left, :fill=>:both, :expand=>true, :padx=>6, :pady=>4)
31
32Tk.root.grid_columnconfigure(0, :weight=>1)
33Tk.root.grid_rowconfigure(0, :weight=>1)
34
35priv = {
36  :x=>0, :y=>0, :pie_in=>false, :angle=>pie[:angle], :origin=>pie[:origin]
37}
38
39pie.bind('ButtonPress-1', proc{|w, x, y|
40             priv[:x] = x
41             priv[:y] = y
42             priv[:pie_in] = (w.winfo_width/1.8 > x)
43             priv[:angle]  = w[:angle]
44             priv[:origin] = w[:origin]
45         }, '%W %x %y')
46
47pie.bind('B1-Motion', proc{|w, x, y|
48           if priv[:pie_in]
49             w.configure(:angle=>priv[:angle] + (priv[:y] - y)/3,
50                         :origin=>(priv[:origin] +
51                                   ((w.winfo_height/2.2 > y)? -1: 1) *
52                                   (priv[:x] - x)/3) % 360)
53           end
54         }, '%W %x %y')
55
56Tk.mainloop
57