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#!/usr/bin/env ruby
require 'tk'
require 'tkextlib/vu/pie'
pie = Tk::Vu::Pie.new(:label=>"My Revolving Budget"){
itemconfigure('Welfare', :value=>3.004)
itemconfigure('Military', :value=>7.006)
itemconfigure('Transport', :value=>1.6, :explode=>15)
itemconfigure('Parks', :value=>0.9)
itemconfigure('Schools', :value=>2)
itemconfigure('Debt', :value=>4, :explode=>10)
configure(:angle=>10, :origin=>90, :shadow=>10)
}
spin = TkTimer.new(60, -1, proc{|obj|
pie.configure(:origin=>pie[:origin] + 1)
})
f = TkFrame.new
fast_btn = TkButton.new(f, :text=>"Spin Faster", :command=>proc{spin.start})
slow_btn = TkButton.new(f, :text=>"Spin Slower", :command=>proc{spin.stop})
quit_btn = TkButton.new(f, :text=>"Exit", :command=>proc{exit})
Tk.grid(pie, :sticky=>:news)
Tk.grid(f, :sticky=>:ew)
Tk.pack(fast_btn, slow_btn, quit_btn,
:in=>f, :side=>:left, :fill=>:both, :expand=>true, :padx=>6, :pady=>4)
Tk.root.grid_columnconfigure(0, :weight=>1)
Tk.root.grid_rowconfigure(0, :weight=>1)
priv = {
:x=>0, :y=>0, :pie_in=>false, :angle=>pie[:angle], :origin=>pie[:origin]
}
pie.bind('ButtonPress-1', proc{|w, x, y|
priv[:x] = x
priv[:y] = y
priv[:pie_in] = (w.winfo_width/1.8 > x)
priv[:angle] = w[:angle]
priv[:origin] = w[:origin]
}, '%W %x %y')
pie.bind('B1-Motion', proc{|w, x, y|
if priv[:pie_in]
w.configure(:angle=>priv[:angle] + (priv[:y] - y)/3,
:origin=>(priv[:origin] +
((w.winfo_height/2.2 > y)? -1: 1) *
(priv[:x] - x)/3) % 360)
end
}, '%W %x %y')
Tk.mainloop
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