Class: TkGoldberg_Demo

Inherits:
Object show all
Defined in:
sample/demos-en/goldberg.rb,
sample/demos-jp/goldberg.rb

Instance Method Summary collapse

Constructor Details

#initialize(parent) ⇒ TkGoldberg_Demo

Returns a new instance of TkGoldberg_Demo.



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# File 'sample/demos-en/goldberg.rb', line 93

def initialize(parent)
  @parent = parent

  @S = {}
  @S['title']   = 'Tk Goldberg'
  @S['speed']   = TkVariable.new(5)
  @S['cnt']     = TkVariable.new(0)
  @S['message'] = TkVariable.new("\\nWelcome\\nto\\nRuby/Tk")
  @S['pause']   = TkVariable.new
  @S['details'] = TkVariable.new(true)

  @S['mode'] = TkVariable.new(:MSTART, :symbol)
  #            :MSTART, :MGO, :MPAUSE, :MSSTEP, :MBSTEP, :MDONE, :MDEBUG

  #         0,  1,  2,  3,  4,  5,   6,   7,   8,   9,  10
  @speed = [1, 10, 20, 50, 80, 100, 150, 200, 300, 400, 500]

  # colors
  @C = {}
  @C['fg'] = 'black'
  # @C['bg'] = 'gray75'
  @C['bg'] = 'cornflowerblue'

  @C['0'] = 'white';         @C['1a'] = 'darkgreen';   @C['1b'] = 'yellow'
  @C['2'] = 'red';           @C['3a'] = 'green';       @C['3b'] = 'darkblue'
  @C['4'] = @C['fg'];        @C['5a'] = 'brown';       @C['5b'] = 'white'
  @C['6'] = 'magenta';       @C['7'] = 'green';        @C['8'] = @C['fg']
  @C['9'] = 'blue4';         @C['10a'] = 'white';      @C['10b'] = 'cyan'
  @C['11a'] = 'yellow';      @C['11b'] = 'mediumblue'; @C['12'] = 'tan2'
  @C['13a'] = 'yellow';      @C['13b'] = 'red';        @C['14'] = 'white'
  @C['15a'] = 'green';       @C['15b'] = 'yellow';     @C['16'] = 'gray65'
  @C['17'] = '#A65353';     @C['18'] = @C['fg'];      @C['19'] = 'gray50'
  @C['20'] = 'cyan';         @C['21'] = 'gray65';      @C['22'] = @C['20']
  @C['23a'] = 'blue';        @C['23b'] = 'red';        @C['23c'] = 'yellow'
  @C['24a'] = 'red';         @C['24b'] = 'white';

  @STEP = TkVariable.new_hash
  @STEP.default_value_type = :numeric

  @XY = {}

  @XY6 = {
    '-1'=>[366, 207], '-2'=>[349, 204], '-3'=>[359, 193], '-4'=>[375, 192],
    '-5'=>[340, 190], '-6'=>[349, 177], '-7'=>[366, 177], '-8'=>[380, 176],
    '-9'=>[332, 172], '-10'=>[342, 161], '-11'=>[357, 164],
    '-12'=>[372, 163], '-13'=>[381, 149], '-14'=>[364, 151],
    '-15'=>[349, 146], '-16'=>[333, 148], '0'=>[357, 219],
    '1'=>[359, 261], '2'=>[359, 291], '3'=>[359, 318], '4'=>[361, 324],
    '5'=>[365, 329], '6'=>[367, 334], '7'=>[367, 340], '8'=>[366, 346],
    '9'=>[364, 350], '10'=>[361, 355], '11'=>[359, 370], '12'=>[359, 391],
    '13,0'=>[360, 456], '13,1'=>[376, 456], '13,2'=>[346, 456],
    '13,3'=>[330, 456], '13,4'=>[353, 444], '13,5'=>[368, 443],
    '13,6'=>[339, 442], '13,7'=>[359, 431], '13,8'=>[380, 437],
    '13,9'=>[345, 428], '13,10'=>[328, 434], '13,11'=>[373, 424],
    '13,12'=>[331, 420], '13,13'=>[360, 417], '13,14'=>[345, 412],
    '13,15'=>[376, 410], '13,16'=>[360, 403]
  }

  @timer = TkTimer.new(@speed[@S['speed'].numeric]){|timer|
    timer.set_interval(go)
  }

  do_display
  reset

  # Start everything going
  @timer.start
end

Instance Method Details

#_round_poly2(x0, y0, x1, y1, x2, y2, radius) ⇒ Object 



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# File 'sample/demos-en/goldberg.rb', line 1941

def _round_poly2(x0, y0, x1, y1, x2, y2, radius)
  d = 2 * radius
  maxr = 0.75

  v1x = x0 - x1
  v1y = y0 - y1
  v2x = x2 - x1
  v2y = y2 - y1

  vlen1 = Math.sqrt(v1x*v1x + v1y*v1y)
  vlen2 = Math.sqrt(v2x*v2x + v2y*v2y)

  if d > maxr * vlen1
    d = maxr * vlen1
  end
  if d > maxr * vlen2
    d = maxr * vlen2
  end

  xy = []
  xy << (x1 + d * v1x / vlen1) << (y1 + d * v1y / vlen1)
  xy << x1 << y1
  xy << (x1 + d * v2x / vlen2) << (y1 + d * v2y / vlen2)

  return xy
end

#about ⇒ Object 



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# File 'sample/demos-en/goldberg.rb', line 402

def about
  msg = "Ruby/Tk Version ::\nby Hidetoshi NAGAI ([email protected])\n\n"
  msg += "Original Version ::\n"
  msg += "#{@S['title']}\nby Keith Vetter, March 2003\n(Reproduced by kind permission of the author)\n\n"
  msg += "Man will always find a difficult means to perform a simple task"
  msg += "\nRube Goldberg"
  Tk.messageBox(:message=>msg, :title=>'About')
end

#active_GUI(var1, var2, op) ⇒ Object 



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# File 'sample/demos-en/goldberg.rb', line 315

def active_GUI(var1, var2, op)
  st = {false=>:disabled, true=>:normal}

  m = @S['mode'].to_sym
  @S['pause'].value = (m == :MPAUSE)
  @start.state(st[m != :MGO])
  @pause.state(st[m != :MSTART && m != :MDONE])
  @step.state(st[m != :MGO && m != :MDONE])
  @bstep.state(st[m != :MGO && m != :MDONE])
  @reset.state(st[m != :MSTART])

  if @S['details'].bool
    Tk.grid(@f_details, :in=>@details, :row=>2, :sticky=>:ew)
  else
    Tk.grid_forget(@f_details)
  end
  @speed_scale.label("Speed: #{@S['speed'].value}")
end

#anchor(item, where) ⇒ Object 



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# File 'sample/demos-en/goldberg.rb', line 1984

def anchor(item, where)
  x1, y1, x2, y2 = @canvas.bbox(item)
  case(where)
  when :n
    y = y1
  when :s
    y = y2
  else
    y = (y1 + y2) / 2.0
  end
  case(where)
  when :w
    x = x1
  when :e
    x = x2
  else
    x = (x1 + x2) / 2.0
  end
  return [x, y]
end

#box(x, y, r) ⇒ Object

Helper functions



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# File 'sample/demos-en/goldberg.rb', line 1807

def box(x, y, r)
  [x - r, y - r, x + r, y + r]
end

#centroid(item) ⇒ Object 



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# File 'sample/demos-en/goldberg.rb', line 1980

def centroid(item)
  anchor(item, :c)
end

#do_button(what) ⇒ Object 



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# File 'sample/demos-en/goldberg.rb', line 338

def do_button(what)
  case what
  when 0  # Start
    reset if @S['mode'].to_sym == :MDONE
    @S['mode'].value = :MGO

  when 1  # Pause
    @S['mode'].value = ((@S['pause'].bool)? :MPAUSE: :MGO)

  when 2  # Step
    @S['mode'].value = :MSSTEP

  when 3  # Reset
    reset

  when 4  # Big step
    @S['mode'].value = :MBSTEP
  end
end

#do_ctrl_frame ⇒ Object 



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# File 'sample/demos-en/goldberg.rb', line 216

def do_ctrl_frame
  @start = Tk::Button.new(@parent, :text=>'Start', :bd=>6,
                        :command=>proc{do_button(0)})
  if font = @start['font']
    @start.font(font.weight('bold'))
  end

  @pause = TkCheckbutton.new(@parent, :text=>'Pause', :font=>font,
                             :command=>proc{do_button(1)}, :relief=>:raised,
                             :variable=>@S['pause'])

  @step  = TkButton.new(@parent, :text=>'Single Step', :font=>font,
                        :command=>proc{do_button(2)})
  @bstep = TkButton.new(@parent, :text=>'Big Step', :font=>font,
                        :command=>proc{do_button(4)})
  @reset = TkButton.new(@parent, :text=>'Reset', :font=>font,
                        :command=>proc{do_button(3)})

  @details = TkFrame.new(@parent, :bd=>2, :relief=>:ridge)
  @detail = TkCheckbutton.new(@parent, :text=>'Details', :font=>font,
                             :relief=>:raised, :variable=>@S['details'])

  @msg_entry = TkEntry.new(@parent, :textvariable=>@S['message'],
                           :justify=>:center)
  @speed_scale = TkScale.new(@parent, :orient=>:horizontal,
                             :from=>1, :to=>10, :font=>font,
                             :variable=>@S['speed'], :bd=>2,
                             :relief=>:ridge, :showvalue=>false)
  @about = TkButton.new(@parent, :text=>'About',
                        :command=>proc{about}, :font=>font)

  Tk.grid(@start, :in=>@ctrl, :row=>0, :sticky=>:ew)
  @ctrl.grid_rowconfigure(1, :minsize=>10)
  Tk.grid(@pause, :in=>@ctrl, :row=>2, :sticky=>:ew)
  Tk.grid(@step,  :in=>@ctrl, :sticky=>:ew)
  Tk.grid(@bstep, :in=>@ctrl, :sticky=>:ew)
  Tk.grid(@reset, :in=>@ctrl, :sticky=>:ew)
  @ctrl.grid_rowconfigure(10, :minsize=>20)
  Tk.grid(@details, :in=>@ctrl, :row=>11, :sticky=>:ew)
  Tk.grid(@detail, :in=>@details, :row=>0, :sticky=>:ew)
  @ctrl.grid_rowconfigure(50, :weight=>1)

  @S['mode'].trace('w', proc{|*args| active_GUI(*args)})
  @S['details'].trace('w', proc{|*args| active_GUI(*args)})
  @S['speed'].trace('w', proc{|*args| active_GUI(*args)})

  Tk.grid(@msg_entry, :in=>@ctrl, :row=>98, :sticky=>:ew, :pady=>5)
  Tk.grid(@speed_scale, :in=>@ctrl, :row=>99, :sticky=>:ew)
  Tk.grid(@about, :in=>@ctrl, :row=>100, :sticky=>:ew)

  @reset.bind('3'){@S['mode'].value = -1}  # Debugging
end

#do_detail_frame ⇒ Object 



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# File 'sample/demos-en/goldberg.rb', line 269

def do_detail_frame
  @f_details = TkFrame.new(@details)

  @label = TkLabel.new(@f_details, :textvariable=>@S['cnt'],
                       :bd=>1, :relief=>:solid, :bg=>'white')
  Tk.grid(@label, '-', '-', '-', :sticky=>:ew, :row=>0)

  idx = 1
  loop {
    break unless respond_to?("move#{idx}")
    l = TkLabel.new(@f_details, :text=>idx, :anchor=>:e,
                    :width=>2, :bd=>1, :relief=>:solid, :bg=>'white')
    @STEP[idx] = 0
    ll = TkLabel.new(@f_details, :textvariable=>@STEP.ref(idx),
                     :width=>5, :bd=>1, :relief=>:solid, :bg=>'white')
    row = (idx + 1)/2
    col = ((idx + 1) & 1) * 2
    Tk.grid(l, :sticky=>:ew, :row=>row, :column=>col)
    Tk.grid(ll, :sticky=>:ew, :row=>row, :column=>(col + 1))
    idx += 1
  }
  @f_details.grid_columnconfigure(1, :weight=>1)
end

#do_display ⇒ Object 



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# File 'sample/demos-en/goldberg.rb', line 162

def do_display()
  @ctrl = TkFrame.new(@parent, :relief=>:ridge, :bd=>2, :padx=>5, :pady=>5)
  @screen = TkFrame.new(@parent, :bd=>2,
                       :relief=>:raised).pack(:side=>:left, :fill=>:both,
                                              :expand=>true)

  @canvas = TkCanvas.new(@parent, :width=>850, :height=>700,
                        :bg=>@C['bg'], :highlightthickness=>0){
    scrollregion([0, 0, 1000, 1000]) # Kludge to move everything up
    yview_moveto(0.05)
  }.pack(:in=>@screen, :side=>:top, :fill=>:both, :expand=>true)

  @canvas.bind('3'){ @pause.invoke }
  @canvas.bind('Destroy'){ @timer.stop }

  do_ctrl_frame
  do_detail_frame

  # msg = TkLabel.new(@parent, :bg=>@C['bg'], :fg=>'white') {
  msg = Tk::Label.new(@parent, :bg=>@C['bg'], :fg=>'white') {
    font 'Arial 10'
    wraplength 600
    justify 'left'
    text "This is a demonstration of just how complex you can make your animations become. Click the ball to start things moving!\n\"Man will always find a difficult means to perform a simple task\" - Rube Goldberg"
  }
  msg.place(:in=>@canvas, :relx=>0, :rely=>0, :anchor=>:nw)

  frame = TkFrame.new(@parent, :bg=>@C['bg'])

  # TkButton.new(frame, :bg=>@C['bg'], :activebackground=>@C['bg']) {
  Tk::Button.new(frame, :bg=>@C['bg'], :activebackground=>@C['bg']) {
    text 'Dismiss'
    command proc{
      tmppath = $goldberg_demo
      $goldberg_demo = nil
      tmppath.destroy
    }
  }.pack('side'=>'left')

  # TkButton.new(frame, :bg=>@C['bg'], :activebackground=>@C['bg']) {
  Tk::Button.new(frame, :bg=>@C['bg'], :activebackground=>@C['bg']) {
    text 'See Code'
    command proc{showCode 'goldberg'}
  }.pack('side'=>'left', 'padx'=>5)

  # @show = TkButton.new(frame, :text=>'>>', :command=>proc{show_ctrl},
  @show = Tk::Button.new(frame, :text=>'>>', :command=>proc{show_ctrl},
                       :bg=>@C['bg'], :activebackground=>@C['bg'])
  @show.pack('side'=>'left')
  frame.place(:in=>@canvas, :relx=>1, :rely=>0, :anchor=>:ne)

  Tk.update
end

#draw0 ⇒ Object

START HERE! banner



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# File 'sample/demos-en/goldberg.rb', line 417

def draw0
  color = @C['0']
  TkcText.new(@canvas, [579, 119], :text=>'START HERE!',
              :fill=>color, :anchor=>:w,
              :tag=>'I0', :font=>['Times Roman', 12, :italic, :bold])
  TkcLine.new(@canvas, [719, 119, 763, 119], :tag=>'I0', :fill=>color,
              :width=>5, :arrow=>:last, :arrowshape=>[18, 18, 5])
  @canvas.itembind('I0', '1'){ start }
end

#draw1 ⇒ Object

Dropping ball



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# File 'sample/demos-en/goldberg.rb', line 445

def draw1
  color = @C['1a']
  color2 = @C['1b']
  TkcPolygon.new(@canvas,
                 [ 844, 133, 800, 133, 800, 346, 820, 346,
                   820, 168, 844, 168, 844, 133 ],
                 :width=>3, :fill=>color, :outline=>'')
  TkcPolygon.new(@canvas,
                 [ 771, 133, 685, 133, 685, 168, 751, 168,
                   751, 346, 771, 346, 771, 133 ],
                 :width=>3, :fill=>color, :outline=>'')
  TkcOval.new(@canvas, box(812, 122, 9),
              :tag=>'I1', :fill=>color2, :outline=>'')

  @canvas.itembind('I1', '1'){ start }
end

#draw10 ⇒ Object

Boat



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# File 'sample/demos-en/goldberg.rb', line 957

def draw10
  color  = @C['10a']
  color2 = @C['10b']
  xy = [191, 230, 233, 230, 233, 178, 191, 178]  # Sail
  TkcPolygon.new(@canvas, xy, :fill=>color, :width=>3, :outline=>@C['fg'],
                 :tag=>'I10')
  xy = box(209, 204, 31)  # Front
  TkcArc.new(@canvas, xy, :outline=>'', :fill=>color, :style=>:pie,
             :start=>120, :extent=>120, :tag=>'I10')
  TkcArc.new(@canvas, xy, :outline=>@C['fg'], :width=>3, :style=>:arc,
             :start=>120, :extent=>120, :tag=>'I10')
  xy = box(249, 204, 31)  # Back
  TkcArc.new(@canvas, xy, :outline=>'', :fill=>@C['bg'], :width=>3,
             :style=>:pie, :start=>120, :extent=>120, :tag=>'I10')
  TkcArc.new(@canvas, xy, :outline=>@C['fg'], :width=>3, :style=>:arc,
             :start=>120, :extent=>120, :tag=>'I10')

  xy = [200, 171, 200, 249]  # Mast
  TkcLine.new(@canvas, xy, :fill=>@C['fg'], :width=>3, :tag=>'I10')
  xy = [159, 234, 182, 234]  # Bow sprit
  TkcLine.new(@canvas, xy, :fill=>@C['fg'], :width=>3, :tag=>'I10')
  xy = [180, 234, 180, 251, 220, 251]  # Hull
  TkcLine.new(@canvas, xy, :fill=>@C['fg'], :width=>6, :tag=>'I10')

  xy = [92, 255, 221, 255]  # Waves
  sine(xy, 2, 25, :fill=>color2, :width=>1, :tag=>'I10w')

  xy = @canvas.coords('I10w')[4..-5]  # Water
  xy.concat([222, 266, 222, 277, 99, 277])
  TkcPolygon.new(@canvas, xy, :fill=>color2, :outline=>color2)
  xy = [222, 266, 222, 277, 97, 277, 97, 266]  # Water bottom
  TkcLine.new(@canvas, xy, :fill=>@C['fg'], :width=>3)

  xy = box(239, 262, 17)
  TkcArc.new(@canvas, xy, :outline=>@C['fg'], :width=>3, :style=>:arc,
             :start=>95, :extent=>103)
  xy = box(76, 266, 21)
  TkcArc.new(@canvas, xy, :outline=>@C['fg'], :width=>3, :style=>:arc,
             :extent=>190)
end

#draw11 ⇒ Object

2nd ball drop



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# File 'sample/demos-en/goldberg.rb', line 1018

def draw11
  color  = @C['11a']
  color2 = @C['11b']
  xy = [23, 264, 55, 591]  # Color the down tube
  TkcRectangle.new(@canvas, xy, :fill=>color, :outline=>'')
  xy = box(71, 460, 48)    # Color the outer loop
  TkcOval.new(@canvas, xy, :fill=>color, :outline=>'')

  xy = [55, 264, 55, 458]  # Top right side
  TkcLine.new(@canvas, xy, :fill=>@C['fg'], :width=>3)
  xy = [55, 504, 55, 591]  # Bottom right side
  TkcLine.new(@canvas, xy, :fill=>@C['fg'], :width=>3)
  xy = box(71, 460, 48)    # Outer loop
  TkcArc.new(@canvas, xy, :outline=>@C['fg'], :width=>3, :style=>:arc,
             :start=>110, :extent=>-290, :tag=>'I11i')
  xy = box(71, 460, 16)    # Inner loop
  TkcOval.new(@canvas, xy, :outline=>@C['fg'], :fill=>'',
              :width=>3, :tag=>'I11i')
  TkcOval.new(@canvas, xy, :outline=>@C['fg'], :fill=>@C['bg'], :width=>3)

  xy = [23, 264, 23, 591]  # Left side
  TkcLine.new(@canvas, xy, :fill=>@C['fg'], :width=>3)
  xy = box(1, 266, 23)     # Top left curve
  TkcArc.new(@canvas, xy, :outline=>@C['fg'], :width=>3,
             :style=>:arc, :extent=>90)

  xy = box(75, 235, 9)     # The ball
  TkcOval.new(@canvas, xy, :fill=>color2, :outline=>'',
              :width=>3, :tag=>'I11')
end

#draw12 ⇒ Object

Hand



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# File 'sample/demos-en/goldberg.rb', line 1066

def draw12
  xy = [
    20, 637, 20, 617, 20, 610, 20, 590, 40, 590, 40, 590,
    60, 590, 60, 610, 60, 610
  ]
  xy.concat([60, 610, 65, 620, 60, 631])  # Thumb
  xy.concat([60, 631, 60, 637, 60, 662, 60, 669, 52, 669,
              56, 669, 50, 669, 50, 662, 50, 637])

  y0 = 637  # Bumps for fingers
  y1 = 645
  50.step(21, -10){|x|
    x1 = x - 5
    x2 = x - 10
    xy << x << y0 << x1 << y1 << x2 << y0
  }
  TkcPolygon.new(@canvas, xy, :fill=>@C['12'], :outline=>@C['fg'],
                 :smooth=>true, :tag=>'I12', :width=>3)
end

#draw13 ⇒ Object

Fax



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# File 'sample/demos-en/goldberg.rb', line 1098

def draw13
  color = @C['13a']
  xy = [86, 663, 149, 663, 149, 704, 50, 704, 50, 681, 64, 681, 86, 671]
  xy2 = [
    784, 663, 721, 663, 721, 704, 820, 704, 820, 681, 806, 681, 784, 671
  ]
  radii = [2, 9, 9, 8, 5, 5, 2]

  round_poly(@canvas, xy, radii, :width=>3,
             :outline=>@C['fg'], :fill=>color)
  round_poly(@canvas, xy2, radii, :width=>3,
             :outline=>@C['fg'], :fill=>color)

  xy = [56, 677]
  x, y = xy
  TkcRectangle.new(@canvas, box(x, y, 4), :fill=>'', :outline=>@C['fg'],
                   :width=>3, :tag=>'I13')
  xy = [809, 677]
  x, y = xy
  TkcRectangle.new(@canvas, box(x, y, 4), :fill=>'', :outline=>@C['fg'],
                   :width=>3, :tag=>'I13R')

  xy = [112, 687]  # Label
  TkcText.new(@canvas, xy, :text=>'FAX', :fill=>@C['fg'],
              :font=>['Times Roman', 12, :bold])
  xy = [762, 687]
  TkcText.new(@canvas, xy, :text=>'FAX', :fill=>@C['fg'],
              :font=>['Times Roman', 12, :bold])

  xy = [138, 663, 148, 636, 178, 636]  # Paper guide
  TkcLine.new(@canvas, xy, :smooth=>true, :fill=>@C['fg'], :width=>3)
  xy = [732, 663, 722, 636, 692, 636]
  TkcLine.new(@canvas, xy, :smooth=>true, :fill=>@C['fg'], :width=>3)

  sine([149, 688, 720, 688], 5, 15,
       :tag=>'I13_s', :fill=>@C['fg'],  :width=>3)
end

#draw14 ⇒ Object

Paper in fax



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# File 'sample/demos-en/goldberg.rb', line 1159

def draw14
  color = @C['14']
  xy = [102, 661, 113, 632, 130, 618]  # Left paper edge
  TkcLine.new(@canvas, xy, :smooth=>true, :fill=>color,
              :width=>3, :tag=>'I14L_0')
  xy = [148, 629, 125, 640, 124, 662]  # Right paper edge
  TkcLine.new(@canvas, xy, :smooth=>true, :fill=>color,
              :width=>3, :tag=>'I14L_1')
  draw14a('L')

  xy = [
    768.0, 662.5, 767.991316225, 662.433786215, 767.926187912, 662.396880171
  ]
  TkcLine.new(@canvas, xy, :smooth=>true, :fill=>color,
              :width=>3, :tag=>'I14R_0')
  @canvas.lower('I14R_0')
  # NB. these numbers are VERY sensitive, you must start with final size
  # and shrink down to get the values
  xy = [
    745.947897349, 662.428358855, 745.997829056, 662.452239237, 746.0, 662.5
  ]
  TkcLine.new(@canvas, xy, :smooth=>true, :fill=>color,
              :width=>3, :tag=>'I14R_1')
  @canvas.lower('I14R_1')
end

#draw14a(side) ⇒ Object 



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# File 'sample/demos-en/goldberg.rb', line 1185

def draw14a(side)
  color = @C['14']
  xy = @canvas.coords("I14#{side}_0")
  xy2 = @canvas.coords("I14#{side}_1")
  x0, y0, x1, y1, x2, y2 = xy
  x3, y3, x4, y4, x5, y5 = xy2

  zz = [
    x0, y0, x0, y0, xy, x2, y2, x2, y2,
    x3, y3, x3, y3, xy2, x5, y5, x5, y5
  ].flatten
  @canvas.delete("I14#{side}")
  TkcPolygon.new(@canvas, zz, :tag=>"I14#{side}", :smooth=>true,
                 :fill=>color, :outline=>color, :width=>3)
  @canvas.lower("I14#{side}")
end

#draw15 ⇒ Object

Light beam



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# File 'sample/demos-en/goldberg.rb', line 1232

def draw15
  color = @C['15a']
  xy = [824, 599, 824, 585, 820, 585, 829, 585]
  TkcLine.new(@canvas, xy, :fill=>@C['fg'], :width=>3, :tag=>'I15a')
  xy = [789, 599, 836, 643]
  TkcRectangle.new(@canvas, xy, :fill=>color, :outline=>@C['fg'], :width=>3)
  xy = [778, 610, 788, 632]
  TkcRectangle.new(@canvas, xy, :fill=>color, :outline=>@C['fg'], :width=>3)
  xy = [766, 617, 776, 625]
  TkcRectangle.new(@canvas, xy, :fill=>color, :outline=>@C['fg'], :width=>3)

  xy = [633, 600, 681, 640]
  TkcRectangle.new(@canvas, xy, :fill=>color, :outline=>@C['fg'], :width=>3)
  xy = [635, 567, 657, 599]
  TkcRectangle.new(@canvas, xy, :fill=>color, :outline=>@C['fg'], :width=>2)
  xy = [765, 557, 784, 583]
  TkcRectangle.new(@canvas, xy, :fill=>color, :outline=>@C['fg'], :width=>2)

  sine([658, 580, 765, 580], 3, 15,
       :tag=>'I15_s', :fill=>@C['fg'], :width=>3)
end

#draw16 ⇒ Object

Bell



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# File 'sample/demos-en/goldberg.rb', line 1284

def draw16
  color = @C['16']
  xy = [722, 485, 791, 556]
  TkcRectangle.new(@canvas, xy, :fill=>'', :outline=>@C['fg'], :width=>3)
  xy = box(752, 515, 25)  # Bell
  TkcOval.new(@canvas, xy, :fill=>color, :outline=>'black',
              :tag=>'I16b', :width=>2)
  xy = box(752, 515, 5)   # Bell button
  TkcOval.new(@canvas, xy, :fill=>'black', :outline=>'black', :tag=>'I16b')

  xy = [784, 523, 764, 549]  # Clapper
  TkcLine.new(@canvas, xy, :width=>3, :tag=>'I16c', :fill=>@C['fg'])
  xy = box(784, 523, 4)
  TkcOval.new(@canvas, xy, :fill=>@C['fg'], :outline=>@C['fg'], :tag=>'I16d')
end

#draw17 ⇒ Object

Cat



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# File 'sample/demos-en/goldberg.rb', line 1319

def draw17
  color = @C['17']

  xy = [584, 556, 722, 556]
  TkcLine.new(@canvas, xy, :fill=>@C['fg'], :width=>3)
  xy = [584, 485, 722, 485]
  TkcLine.new(@canvas, xy, :fill=>@C['fg'], :width=>3)

  xy = [664, 523, 717, 549]  # Body
  TkcArc.new(@canvas, xy, :outline=>@C['fg'], :fill=>color, :width=>3,
             :style=>:chord, :start=>128, :extent=>260, :tag=>'I17')

  xy = [709, 554, 690, 543]  # Paw
  TkcOval.new(@canvas, xy, :outline=>@C['fg'], :fill=>color,
              :width=>3, :tag=>'I17')
  xy = [657, 544, 676, 555]
  TkcOval.new(@canvas, xy, :outline=>@C['fg'], :fill=>color,
              :width=>3, :tag=>'I17')

  xy = box(660, 535, 15)     # Lower face
  TkcArc.new(@canvas, xy, :outline=>@C['fg'], :width=>3, :style=>:arc,
             :start=>150, :extent=>240, :tag=>'I17_')
  TkcArc.new(@canvas, xy, :outline=>'', :fill=>color, :width=>1,
             :style=>:chord, :start=>150, :extent=>240, :tag=>'I17_')
  xy = [674, 529, 670, 513, 662, 521, 658, 521, 650, 513, 647, 529]  # Ears
  TkcLine.new(@canvas, xy, :fill=>@C['fg'], :width=>3, :tag=>'I17_')
  TkcPolygon.new(@canvas, xy, :fill=>color, :outline=>'', :width=>1,
                 :tag=>['I17_', 'I17_c'])
  xy = [652, 542, 628, 539]  # Whiskers
  TkcLine.new(@canvas, xy, :fill=>@C['fg'], :width=>3, :tag=>'I17_')
  xy = [652, 543, 632, 545]
  TkcLine.new(@canvas, xy, :fill=>@C['fg'], :width=>3, :tag=>'I17_')
  xy = [652, 546, 632, 552]
  TkcLine.new(@canvas, xy, :fill=>@C['fg'], :width=>3, :tag=>'I17_')

  xy = [668, 543, 687, 538]
  TkcLine.new(@canvas, xy, :fill=>@C['fg'], :width=>3,
              :tag=>['I17_', 'I17_w'])
  xy = [668, 544, 688, 546]
  TkcLine.new(@canvas, xy, :fill=>@C['fg'], :width=>3,
              :tag=>['I17_', 'I17_w'])
  xy = [668, 547, 688, 553]
  TkcLine.new(@canvas, xy, :fill=>@C['fg'], :width=>3,
              :tag=>['I17_', 'I17_w'])

  xy = [649, 530, 654, 538, 659, 530]  # Left eye
  TkcLine.new(@canvas, xy, :fill=>@C['fg'], :width=>2,
              :smooth=>true, :tag=>'I17')
  xy = [671, 530, 666, 538, 661, 530]  # Right eye
  TkcLine.new(@canvas, xy, :fill=>@C['fg'], :width=>2,
              :smooth=>true, :tag=>'I17')
  xy = [655, 543, 660, 551, 665, 543]  # Mouth
  TkcLine.new(@canvas, xy, :fill=>@C['fg'], :width=>2,
              :smooth=>true, :tag=>'I17')
end

#draw18 ⇒ Object

Sling shot



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# File 'sample/demos-en/goldberg.rb', line 1420

def draw18
  color = @C['18']
  xy = [721, 506, 627, 506]  # Sling hold
  TkcLine.new(@canvas, xy, :width=>4, :fill=>@C['fg'], :tag=>'I18')

  xy = [607, 500, 628, 513]  # Sling rock
  TkcOval.new(@canvas, xy, :fill=>color, :outline=>'', :tag=>'I18a')

  xy = [526, 513, 606, 507, 494, 502]  # Sling band
  TkcLine.new(@canvas, xy, :fill=>@C['fg'], :width=>4, :tag=>'I18b')
  xy = [485, 490, 510, 540, 510, 575, 510, 540, 535, 491]  # Sling
  TkcLine.new(@canvas, xy, :fill=>@C['fg'], :width=>6)
end

#draw19 ⇒ Object

Water pipe



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# File 'sample/demos-en/goldberg.rb', line 1472

def draw19
  color = @C['19']
  xx = [[249, 181], [155, 118], [86, 55], [22, 0]]
  xx.each{|x1, x2|
    TkcRectangle.new(@canvas, x1, 453, x2, 467,
                     :fill=>color, :outline=>'', :tag=>'I19')
    TkcLine.new(@canvas, x1, 453, x2, 453,
                :fill=>@C['fg'], :width=>1) # Pipe top
    TkcLine.new(@canvas, x1, 467, x2, 467,
                :fill=>@C['fg'], :width=>1) # Pipe bottom
  }
  @canvas.raise('I11i')

  xy = box(168, 460, 16)  # Bulge by the joint
  TkcOval.new(@canvas, xy, :fill=>color, :outline=>'')
  TkcArc.new(@canvas, xy, :outline=>@C['fg'], :width=>1, :style=>:arc,
             :start=>21, :extent=>136)
  TkcArc.new(@canvas, xy, :outline=>@C['fg'], :width=>1, :style=>:arc,
             :start=>-21, :extent=>-130)

  xy = [249, 447, 255, 473]  # First joint 26x6
  TkcRectangle.new(@canvas, xy, :fill=>color, :outline=>@C['fg'], :width=>1)

  xy = box(257, 433, 34)     # Bend up
  TkcArc.new(@canvas, xy, :outline=>'', :fill=>color, :width=>1,
             :style=>:pie, :start=>0, :extent=>-91)
  TkcArc.new(@canvas, xy, :outline=>@C['fg'], :width=>1,
             :style=>:arc, :start=>0, :extent=>-90)
  xy = box(257, 433, 20)
  TkcArc.new(@canvas, xy, :outline=>'', :fill=>@C['bg'], :width=>1,
             :style=>:pie, :start=>0, :extent=>-92)
  TkcArc.new(@canvas, xy, :outline=>@C['fg'], :width=>1,
             :style=>:arc, :start=>0, :extent=>-90)
  xy = box(257, 421, 34)     # Bend left
  TkcArc.new(@canvas, xy, :outline=>'', :fill=>color, :width=>1,
             :style=>:pie, :start=>0, :extent=>91)
  TkcArc.new(@canvas, xy, :outline=>@C['fg'], :width=>1,
             :style=>:arc, :start=>0, :extent=>90)
  xy = box(257, 421, 20)
  TkcArc.new(@canvas, xy, :outline=>'', :fill=>@C['bg'], :width=>1,
             :style=>:pie, :start=>0, :extent=>90)
  TkcArc.new(@canvas, xy, :outline=>@C['fg'], :width=>1,
             :style=>:arc, :start=>0, :extent=>90)
  xy = box(243, 421, 34)     # Bend down
  TkcArc.new(@canvas, xy, :outline=>'', :fill=>color, :width=>1,
             :style=>:pie, :start=>90, :extent=>90)
  TkcArc.new(@canvas, xy, :outline=>@C['fg'], :width=>1,
             :style=>:arc, :start=>90, :extent=>90)
  xy = box(243, 421, 20)
  TkcArc.new(@canvas, xy, :outline=>'', :fill=>@C['bg'], :width=>1,
             :style=>:pie, :start=>90, :extent=>90)
  TkcArc.new(@canvas, xy, :outline=>@C['fg'], :width=>1,
             :style=>:arc, :start=>90, :extent=>90)

  xy = [270, 427, 296, 433]  # 2nd joint bottom
  TkcRectangle.new(@canvas, xy, :fill=>color, :outline=>@C['fg'], :width=>1)
  xy = [270, 421, 296, 427]  # 2nd joint top
  TkcRectangle.new(@canvas, xy, :fill=>color, :outline=>@C['fg'], :width=>1)
  xy = [249, 382, 255, 408]  # Third joint right
  TkcRectangle.new(@canvas, xy, :fill=>color, :outline=>@C['fg'], :width=>1)
  xy = [243, 382, 249, 408]  # Third joint left
  TkcRectangle.new(@canvas, xy, :fill=>color, :outline=>@C['fg'], :width=>1)
  xy = [203, 420, 229, 426]  # Last joint
  TkcRectangle.new(@canvas, xy, :fill=>color, :outline=>@C['fg'], :width=>1)

  xy = box(168, 460, 6)      # Handle joint
  TkcOval.new(@canvas, xy, :fill=>@C['fg'], :outline=>'', :tag=>'I19a')
  xy = [168, 460, 168, 512]  # Handle bar
  TkcLine.new(@canvas, xy, :fill=>@C['fg'], :width=>5, :tag=>'I19b')
end

#draw2 ⇒ Object

Lighting the match



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# File 'sample/demos-en/goldberg.rb', line 479

def draw2
  color = @C['2']

  # Fulcrum
  TkcPolygon.new(@canvas, [750, 369, 740, 392, 760, 392],
                 :fill=>@C['fg'], :outline=>@C['fg'])

  # Strike box
  TkcRectangle.new(@canvas, [628, 335, 660, 383],
                   :fill=>'', :outline=>@C['fg'])
  (0..2).each{|y|
    yy = 335 + y*16
    TkcBitmap.new(@canvas, [628, yy], :bitmap=>'gray25',
                  :anchor=>:nw, :foreground=>@C['fg'])
    TkcBitmap.new(@canvas, [644, yy], :bitmap=>'gray25',
                  :anchor=>:nw, :foreground=>@C['fg'])
  }

  # Lever
  TkcLine.new(@canvas, [702, 366, 798, 366],
              :fill=>@C['fg'], :width=>6, :tag=>'I2_0')

  # R strap
  TkcLine.new(@canvas, [712, 363, 712, 355],
              :fill=>@C['fg'], :width=>3, :tag=>'I2_1')

  # L strap
  TkcLine.new(@canvas, [705, 363, 705, 355],
              :fill=>@C['fg'], :width=>3, :tag=>'I2_2')

  # Match stick
  TkcLine.new(@canvas, [679, 356, 679, 360, 717, 360, 717, 356, 679, 356],
              :fill=>@C['fg'], :width=>3, :tag=>'I2_3')

  # Match head
  TkcPolygon.new(@canvas,
                 [ 671, 352, 677.4, 353.9, 680, 358.5, 677.4, 363.1,
                   671, 365, 664.6, 363.1, 662, 358.5, 664.6, 353.9 ],
                 :fill=>color, :outline=>color, :tag=>'I2_4')
end

#draw20 ⇒ Object

Water pouring



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# File 'sample/demos-en/goldberg.rb', line 1555

def draw20
  # do nothing
end

#draw21 ⇒ Object

Bucket



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# File 'sample/demos-en/goldberg.rb', line 1593

def draw21
  color = @C['21']
  xy = [217, 451, 244, 490]  # Right handle
  TkcLine.new(@canvas, xy, :fill=>@C['fg'], :width=>2, :tag=>'I21_a')
  xy = [201, 467, 182, 490]  # Left handle
  TkcLine.new(@canvas, xy, :fill=>@C['fg'], :width=>2, :tag=>'I21_a')

  xy = [245, 490, 237, 535]  # Right side
  xy2 = [189, 535, 181, 490] # Left side
  TkcPolygon.new(@canvas, xy + xy2, :fill=>color, :outline=>'',
                 :tag=>['I21', 'I21f'])
  TkcLine.new(@canvas, xy, :fill=>@C['fg'], :width=>2, :tag=>'I21')
  TkcLine.new(@canvas, xy2, :fill=>@C['fg'], :width=>2, :tag=>'I21')

  xy = [182, 486, 244, 498]  # Top
  TkcOval.new(@canvas, xy, :fill=>color, :outline=>'', :width=>2,
              :tag=>['I21', 'I21f'])
  TkcOval.new(@canvas, xy, :fill=>'', :outline=>@C['fg'], :width=>2,
              :tag=>['I21', 'I21t'])
  xy = [189, 532, 237, 540]  # Bottom
  TkcOval.new(@canvas, xy, :fill=>color, :outline=>@C['fg'], :width=>2,
              :tag=>['I21', 'I21b'])
end

#draw22 ⇒ Object

Bucket drop



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# File 'sample/demos-en/goldberg.rb', line 1646

def draw22
  # do nothing
end

#draw23 ⇒ Object

Blow dart



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# File 'sample/demos-en/goldberg.rb', line 1666

def draw23
  color  = @C['23a']
  color2 = @C['23b']
  color3 = @C['23c']

  xy = [185, 623, 253, 650]  # Block
  TkcRectangle.new(@canvas, xy, :fill=>'black', :outline=>@C['fg'],
                   :width=>2, :tag=>'I23a')
  xy = [187, 592, 241, 623]  # Balloon
  TkcOval.new(@canvas, xy, :outline=>'', :fill=>color, :tag=>'I23b')
  TkcArc.new(@canvas, xy, :outline=>@C['fg'], :width=>3, :tag=>'I23b',
             :style=>:arc, :start=>12, :extent=>336)
  xy = [239, 604, 258, 589, 258, 625, 239, 610]  # Balloon nozzle
  TkcPolygon.new(@canvas, xy, :outline=>'', :fill=>color, :tag=>'I23b')
  TkcLine.new(@canvas, xy, :fill=>@C['fg'], :width=>3, :tag=>'I23b')

  xy = [285, 611, 250, 603]  # Dart body
  TkcOval.new(@canvas, xy, :fill=>color2, :outline=>@C['fg'],
              :width=>3, :tag=>'I23d')
  xy = [249, 596, 249, 618, 264, 607, 249, 596]  # Dart tail
  TkcPolygon.new(@canvas, xy, :fill=>color3, :outline=>@C['fg'],
                 :width=>3, :tag=>'I23d')
  xy = [249, 607, 268, 607]  # Dart detail
  TkcLine.new(@canvas, xy, :fill=>@C['fg'], :width=>3, :tag=>'I23d')
  xy = [285, 607, 305, 607]  # Dart needle
  TkcLine.new(@canvas, xy, :fill=>@C['fg'], :width=>3, :tag=>'I23d')
end

#draw24 ⇒ Object

Balloon



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# File 'sample/demos-en/goldberg.rb', line 1715

def draw24
  color = @C['24a']
  xy = [366, 518, 462, 665]  # Balloon
  TkcOval.new(@canvas, xy, :fill=>color, :outline=>@C['fg'],
              :width=>3, :tag=>'I24')
  xy = [414, 666, 414, 729]  # String
  TkcLine.new(@canvas, xy, :fill=>@C['fg'], :width=>3, :tag=>'I24')
  xy = [410, 666, 404, 673, 422, 673, 418, 666]  # Nozzle
  TkcPolygon.new(@canvas, xy, :fill=>color, :outline=>@C['fg'],
                 :width=>3, :tag=>'I24')

  xy = [387, 567, 390, 549, 404, 542]  # Reflections
  TkcLine.new(@canvas, xy, :fill=>@C['fg'], :smooth=>true,
              :width=>2, :tag=>'I24')
  xy = [395, 568, 399, 554, 413, 547]
  TkcLine.new(@canvas, xy, :fill=>@C['fg'], :smooth=>true,
              :width=>2, :tag=>'I24')
  xy = [403, 570, 396, 555, 381, 553]
  TkcLine.new(@canvas, xy, :fill=>@C['fg'], :smooth=>true,
              :width=>2, :tag=>'I24')
  xy = [408, 564, 402, 547, 386, 545]
  TkcLine.new(@canvas, xy, :fill=>@C['fg'], :smooth=>true,
              :width=>2, :tag=>'I24')
end

#draw3 ⇒ Object

Weight and pulleys



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# File 'sample/demos-en/goldberg.rb', line 564

def draw3
  color = @C['3a']
  color2 = @C['3b']

  xy = [ [602, 296], [577, 174], [518, 174] ]
  xy.each{|x, y| # 3 Pulleys
    TkcOval.new(@canvas, box(x, y, 13),
                :fill=>color, :outline=>@C['fg'], :width=>3)
    TkcOval.new(@canvas, box(x, y, 2), :fill=>@C['fg'], :outline=>@C['fg'])
  }

  # Wall to flame
  TkcLine.new(@canvas, [750, 309, 670, 309], :tag=>'I3_s',
              :width=>3, :fill=>@C['fg'], :smooth=>true)

  # Flame to pulley 1
  TkcLine.new(@canvas, [670, 309, 650, 309], :tag=>'I3_0',
              :width=>3, :fill=>@C['fg'], :smooth=>true)
  TkcLine.new(@canvas, [650, 309, 600, 309], :tag=>'I3_1',
              :width=>3, :fill=>@C['fg'], :smooth=>true)

  # Pulley 1 half way to 2
  TkcLine.new(@canvas, [589, 296, 589, 235], :tag=>'I3_2',
              :width=>3, :fill=>@C['fg'])

  # Pulley 1 other half to 2
  TkcLine.new(@canvas, [589, 235, 589, 174], :width=>3, :fill=>@C['fg'])

  # Across the top
  TkcLine.new(@canvas, [577, 161, 518, 161], :width=>3, :fill=>@C['fg'])

  # Down to weight
  TkcLine.new(@canvas, [505, 174, 505, 205], :tag=>'I3_w',
              :width=>3, :fill=>@C['fg'])

  # Draw the weight as 2 circles, two rectangles and 1 rounded rectangle
  x1, y1, x2, y2 = [515, 207, 495, 207]
  TkcOval.new(@canvas, box(x1, y1, 6),
              :tag=>'I3_', :fill=>color2, :outline=>color2)
  TkcOval.new(@canvas, box(x2, y2, 6),
              :tag=>'I3_', :fill=>color2, :outline=>color2)
  TkcRectangle.new(@canvas, x1, y1 - 6, x2, y2 + 6,
                   :tag=>'I3_', :fill=>color2, :outline=>color2)

  TkcPolygon.new(@canvas, round_rect([492, 220, 518, 263], 15),
                 :smooth=>true, :tag=>'I3_', :fill=>color2, :outline=>color2)

  TkcLine.new(@canvas, [500, 217, 511, 217],
              :tag=>'I3_', :fill=>color2, :width=>10)

  # Bottom weight target
  TkcLine.new(@canvas, [502, 393, 522, 393, 522, 465],
              :tag=>'I3__', :fill=>@C['fg'], :joinstyle=>:miter, :width=>10)
end

#draw4 ⇒ Object

Cage and door



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# File 'sample/demos-en/goldberg.rb', line 643

def draw4
  color = @C['4']
  x0, y0, x1, y1 = [527, 356, 611, 464]

  # Horizontal bars
  y0.step(y1, 12){|y|
    TkcLine.new(@canvas, [x0, y, x1, y], :fill=>color, :width=>1)
  }

  # Vertical bars
  x0.step(x1, 12){|x|
    TkcLine.new(@canvas, [x, y0, x, y1], :fill=>color, :width=>1)
  }

  # Swing gate
  TkcLine.new(@canvas, [518, 464, 518, 428],
              :tag=>'I4', :fill=>color, :width=>1)
end

#draw5 ⇒ Object

Mouse



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# File 'sample/demos-en/goldberg.rb', line 675

def draw5
  color  = @C['5a']
  color2 = @C['5b']

  xy = [377, 248, 410, 248, 410, 465, 518, 465]  # Mouse course
  xy.concat [518, 428, 451, 428, 451, 212, 377, 212]

  TkcPolygon.new(@canvas, xy, :fill=>color2, :outline=>@C['fg'], :width=>3)

  xy = [
    534.5, 445.5, 541, 440, 552, 436, 560, 436, 569, 440, 574, 446,
    575, 452, 574, 454, 566, 456, 554, 456, 545, 456, 537, 454, 530, 452
  ]
  TkcPolygon.new(@canvas, xy, :tag=>['I5', 'I5_0'], :fill=>color)

  TkcLine.new(@canvas, [573, 452, 592, 458, 601, 460, 613, 456], # Tail
              :tag=>['I5', 'I5_1'], :fill=>color, :smooth=>true, :width=>3)

  xy = box(540, 446, 2)   # Eye
  xy = [540, 444, 541, 445, 541, 447, 540, 448, 538, 447, 538, 445]
  TkcPolygon.new(@canvas, xy, :tag=>['I5', 'I5_2'], :fill=>@C['bg'],
                 :outline=>'', :smooth=>true)

  xy = [538, 454, 535, 461] # Front leg
  TkcLine.new(@canvas, xy, :tag=>['I5', 'I5_3'], :fill=>color, :width=>2)

  xy = [566, 455, 569, 462] # Back leg
  TkcLine.new(@canvas, xy, :tag=>['I5', 'I5_4'], :fill=>color, :width=>2)

  xy = [544, 455, 545, 460] # 2nd front leg
  TkcLine.new(@canvas, xy, :tag=>['I5', 'I5_5'], :fill=>color, :width=>2)

  xy = [560, 455, 558, 460] # 2nd back leg
  TkcLine.new(@canvas, xy, :tag=>['I5', 'I5_6'], :fill=>color, :width=>2)
end

#draw6 ⇒ Object

Dropping gumballs



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# File 'sample/demos-en/goldberg.rb', line 734

def draw6
  color = @C['6']
  xy = [324, 130, 391, 204] # Ball holder
  xy = round_rect(xy, 10)
  TkcPolygon.new(@canvas, xy, :smooth=>true,
                 :outline=>@C['fg'], :width=>3, :fill=>color)
  xy = [339, 204, 376, 253] # Below the ball holder
  TkcRectangle.new(@canvas, xy, :outline=>@C['fg'], :width=>3,
                   :fill=>color, :tag=>'I6c')
  xy = box(346, 339, 28)
  TkcOval.new(@canvas, xy, :fill=>color, :outline=>'') # Roter
  TkcArc.new(@canvas, xy, :outline=>@C['fg'], :width=>2, :style=>:arc,
             :start=>80, :extent=>205)
  TkcArc.new(@canvas, xy, :outline=>@C['fg'], :width=>2, :style=>:arc,
             :start=>-41, :extent=>85)

  xy = box(346, 339, 15) # Center of rotor
  TkcOval.new(@canvas, xy, :outline=>@C['fg'], :fill=>@C['fg'], :tag=>'I6m')
  xy = [352, 312, 352, 254, 368, 254, 368, 322] # Top drop to rotor
  TkcPolygon.new(@canvas, xy, :fill=>color, :outline=>'')
  TkcLine.new(@canvas, xy, :fill=>@C['fg'], :width=>2)

  xy = [353, 240, 367, 300] # Poke bottom hole
  TkcRectangle.new(@canvas, xy, :fill=>color, :outline=>'')
  xy = [341, 190, 375, 210] # Poke another hole
  TkcRectangle.new(@canvas, xy, :fill=>color, :outline=>'')

  xy = [
    368, 356, 368, 403, 389, 403, 389, 464, 320, 464, 320, 403,
    352, 403, 352, 366
  ]
  TkcPolygon.new(@canvas, xy, :fill=>color, :outline=>'',
                 :width=>2) # Below rotor
  TkcLine.new(@canvas, xy, :fill=>@C['fg'], :width=>2)
  xy = box(275, 342, 7) # On/off rotor
  TkcOval.new(@canvas, xy, :outline=>@C['fg'], :fill=>@C['fg'])
  xy = [276, 334, 342, 325] # Fan belt top
  TkcLine.new(@canvas, xy, :fill=>@C['fg'], :width=>3)
  xy = [276, 349, 342, 353] # Fan belt bottom
  TkcLine.new(@canvas, xy, :fill=>@C['fg'], :width=>3)

  xy = [337, 212, 337, 247] # What the mouse pushes
  TkcLine.new(@canvas, xy, :fill=>@C['fg'], :width=>3, :tag=>'I6_')
  xy = [392, 212, 392, 247]
  TkcLine.new(@canvas, xy, :fill=>@C['fg'], :width=>3, :tag=>'I6_')
  xy = [337, 230, 392, 230]
  TkcLine.new(@canvas, xy, :fill=>@C['fg'], :width=>7, :tag=>'I6_')

  who = -1 # All the balls
  colors = %w(red cyan orange green blue darkblue)
  colors *= 3

  (0..16).each{|i|
    loc = -i
    color = colors[i]
    x, y = @XY6["#{loc}"]
    TkcOval.new(@canvas, box(x, y, 5),
                :fill=>color, :outline=>color, :tag=>"I6_b#{i}")
  }
  draw6a(12) # The wheel
end

#draw6a(beta) ⇒ Object 



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# File 'sample/demos-en/goldberg.rb', line 796

def draw6a(beta)
  @canvas.delete('I6_0')
  ox, oy = [346, 339]
  (0..3).each{|i|
    b = beta + i * 45
    x, y = rotate_c(28, 0, 0, 0, b)
    xy = [ox + x, oy + y, ox - x, oy - y]
    TkcLine.new(@canvas, xy, :tag=>'I6_0', :fill=>@C['fg'], :width=>2)
  }
end

#draw7 ⇒ Object

On/off switch



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# File 'sample/demos-en/goldberg.rb', line 853

def draw7
  color = @C['7']
  xy = [198, 306, 277, 374]  # Box
  TkcRectangle.new(@canvas, xy, :outline=>@C['fg'], :width=>2,
                   :fill=>color, :tag=>'I7z')
  @canvas.lower('I7z')
  xy = [275, 343, 230, 349]
  TkcLine.new(@canvas, xy, :tag=>'I7', :fill=>@C['fg'], :arrow=>:last,
              :arrowshape=>[23, 23, 8], :width=>6)
  xy = [225, 324]  # On button
  x, y = xy
  TkcOval.new(@canvas, box(x, y, 3), :fill=>@C['fg'], :outline=>@C['fg'])
  xy = [218, 323]  # On text
  font = ['Times Roman', 8]
  TkcText.new(@canvas, xy, :text=>'on', :anchor=>:e,
              :fill=>@C['fg'], :font=>font)
  xy = [225, 350]  # Off button
  x, y = xy
  TkcOval.new(@canvas, box(x, y, 3), :fill=>@C['fg'], :outline=>@C['fg'])
  xy = [218, 349]  # Off text
  TkcText.new(@canvas, xy, :text=>'off', :anchor=>:e,
              :fill=>@C['fg'], :font=>font)
end

#draw8 ⇒ Object

Electricity to the fan



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# File 'sample/demos-en/goldberg.rb', line 889

def draw8
  sine([271, 248, 271, 306], 5, 8, :tag=>'I8_s', :fill=>@C['8'], :width=>3)
end

#draw9 ⇒ Object

Fan



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# File 'sample/demos-en/goldberg.rb', line 911

def draw9
  color = @C['9']
  xy = [266, 194, 310, 220]
  TkcOval.new(@canvas, xy, :outline=>color, :fill=>color)
  xy = [280, 209, 296, 248]
  TkcOval.new(@canvas, xy, :outline=>color, :fill=>color)
  xy = [
    288, 249, 252, 249, 260, 240, 280, 234,
    296, 234, 316, 240, 324, 249, 288, 249
  ]
  TkcPolygon.new(@canvas, xy, :fill=>color, :smooth=>true)

  xy = [248, 205, 265, 214, 264, 205, 265, 196]  # Spinner
  TkcPolygon.new(@canvas, xy, :fill=>color)

  xy = [255, 206, 265, 234]  # Fan blades
  TkcOval.new(@canvas, xy, :fill=>'', :outline=>@C['fg'],
              :width=>3, :tag=>'I9_0')
  xy = [255, 176, 265, 204]
  TkcOval.new(@canvas, xy, :fill=>'', :outline=>@C['fg'],
              :width=>3, :tag=>'I9_0')
  xy = [255, 206, 265, 220]
  TkcOval.new(@canvas, xy, :fill=>'', :outline=>@C['fg'],
              :width=>1, :tag=>'I9_1')
  xy = [255, 190, 265, 204]
  TkcOval.new(@canvas, xy, :fill=>'', :outline=>@C['fg'],
              :width=>1, :tag=>'I9_1')
end

#draw_all ⇒ Object 



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# File 'sample/demos-en/goldberg.rb', line 303

def draw_all
  reset_step
  @canvas.delete(:all)
  idx = 0
  loop{
    m = "draw#{idx}"
    break unless respond_to?(m)
    send(m)
    idx += 1
  }
end

#get_step(who, step) ⇒ Object

Each Move## keeps its state info in STEP, this retrieves and increments it



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# File 'sample/demos-en/goldberg.rb', line 1853

def get_step(who, step)
  if step
    @STEP[who] = step
  else
    if !@STEP.exist?(who) || @STEP[who] == ""
      @STEP[who] = 0
    else
      @STEP[who] += 1
    end
  end
  @STEP[who]
end

#go(who = nil) ⇒ Object 



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# File 'sample/demos-en/goldberg.rb', line 358

def go(who = nil)
  now = Tk::Clock.clicks(:miliseconds)
  if who  # Start here for debugging
    @S['active'] = [who]
    @S['mode'].value = :MGO
  end
  return if @S['mode'].to_sym == :MDEBUG  # Debugging
  # If not paused, do the next move
  n = next_step if @S['mode'].to_sym != :MPAUSE
  @S['mode'].value = :MPAUSE if @S['mode'].to_sym == :MSSTEP  # Single step
  @S['mode'].value = :MSSTEP if @S['mode'].to_sym == :MBSTEP && n  # big step
  elapsed = Tk::Clock.clicks(:miliseconds) - now
  delay = @speed[@S['speed'].to_i] - elapsed
  delay = 1 if delay <= 0
  return delay
end

#h20(y, f) ⇒ Object 



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# File 'sample/demos-en/goldberg.rb', line 1578

def h20(y, f)
  color = @C['20']
  @canvas.delete('I20')

  sine([208, 428, 208, y], 4, f, :tag=>['I20', 'I20s'],
       :width=>3, :fill=>color, :smooth=>true)
  TkcLine.new(@canvas, @canvas.coords('I20s'), :width=>3,
              :fill=>color, :smooth=>1, :tag=>['I20', 'I20a'])
  TkcLine.new(@canvas, @canvas.coords('I20s'), :width=>3,
              :fill=>color, :smooth=>1, :tag=>['I20', 'I20b'])
  @canvas.move('I20a', 8, 0)
  @canvas.move('I20b', 16, 0)
end

#move0(step = nil) ⇒ Object 



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# File 'sample/demos-en/goldberg.rb', line 427

def move0(step = nil)
  step = get_step(0, step)

  if @S['mode'].to_sym != :MSTART    # Start the ball rolling
    move_abs('I0', [-100, -100])     # Hide the banner
    return 2
  end

  pos = [
    [673, 119], [678, 119], [683, 119], [688, 119],
    [693, 119], [688, 119], [683, 119], [678, 119]
  ]
  step = step % pos.length
  move_abs('I0', pos[step])
  return 1
end

#move1(step = nil) ⇒ Object 



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# File 'sample/demos-en/goldberg.rb', line 462

def move1(step = nil)
  step = get_step(1, step)
  pos = [
    [807, 122], [802, 122], [797, 123], [793, 124], [789, 129], [785, 153],
    [785, 203], [785, 278, :x], [785, 367], [810, 392], [816, 438],
    [821, 503], [824, 585, :y], [838, 587], [848, 593], [857, 601],
    [-100, -100]
  ]
  return 0 if step >= pos.length
  where = pos[step]
  move_abs('I1', where)
  move15a if where[2] == :y
  return 3 if where[2] == :x
  return 1
end

#move10(step = nil) ⇒ Object 



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# File 'sample/demos-en/goldberg.rb', line 998

def move10(step = nil)
  step = get_step(10, step)

  pos = [
    [195, 212], [193, 212], [190, 212], [186, 212], [181, 212], [176, 212],
    [171, 212], [166, 212], [161, 212], [156, 212], [151, 212], [147, 212],
    [142, 212], [137, 212], [132, 212, :x], [127, 212], [121, 212],
    [116, 212], [111, 212]
  ]

  return 0 if step >= pos.length

  where = pos[step]
  move_abs('I10', where)

  return 3 if where[2] == :x
  return 1
end

#move11(step = nil) ⇒ Object 



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# File 'sample/demos-en/goldberg.rb', line 1049

def move11(step = nil)
  step = get_step(11, step)

  pos = [
    [75, 235], [70, 235], [65, 237], [56, 240], [46, 247], [38, 266],
    [38, 296], [38, 333], [38, 399], [38, 475], [74, 496], [105, 472],
    [100, 437], [65, 423], [-100, -100], [38, 505], [38, 527, :x], [38, 591]
  ]

  return 0 if step >= pos.length
  where = pos[step]
  move_abs('I11', where)
  return 3 if where[2] == :x
  return 1
end

#move12(step = nil) ⇒ Object 



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# File 'sample/demos-en/goldberg.rb', line 1086

def move12(step = nil)
  step = get_step(12, step)

  pos = [[42.5, 641, :x]]
  return 0 if step >= pos.length
  where = pos[step]
  move_abs('I12', where)
  return 3 if where[2] == :x
  return 1
end

#move13(step = nil) ⇒ Object 



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# File 'sample/demos-en/goldberg.rb', line 1136

def move13(step = nil)
  step = get_step(13, step)

  numsteps = 7

  if step == numsteps + 2
    move_abs('I13_star', [-100, -100])
    @canvas.itemconfigure('I13R', :fill=>@C['13b'], :width=>2)
    return 2
  end
  if step == 0  # Button down
    @canvas.delete('I13')
    sparkle([-100, -100], 'I13_star')  # Create off screen
    return 1
  end
  x0, y0 = anchor('I13_s', :w)
  x1, y1 = anchor('I13_s', :e)
  x = x0 + (x1 - x0) * (step - 1) / numsteps.to_f
  move_abs('I13_star', [x, y0])
  return 1
end

#move14(step = nil) ⇒ Object 



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# File 'sample/demos-en/goldberg.rb', line 1202

def move14(step = nil)
  step = get_step(14, step)

  # Paper going down
  sc = 0.9 - 0.05*step
  if sc < 0.3
    @canvas.delete('I14L')
    return 0
  end

  ox, oy = @canvas.coords('I14L_0')
  @canvas.scale('I14L_0', ox, oy, sc, sc)
  ox, oy = @canvas.coords('I14L_1')[-2..-1]
  @canvas.scale('I14L_1', ox, oy, sc, sc)
  draw14a('L')

  # Paper going up
  sc = 0.35 + 0.05*step
  sc = 1/sc

  ox, oy = @canvas.coords('I14R_0')
  @canvas.scale('I14R_0', ox, oy, sc, sc)
  ox, oy = @canvas.coords('I14R_1')[-2..-1]
  @canvas.scale('I14R_1', ox, oy, sc, sc)
  draw14a('R')

  return((step == 10)? 3: 1)
end

#move15(step = nil) ⇒ Object 



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# File 'sample/demos-en/goldberg.rb', line 1261

def move15(step = nil)
  step = get_step(15, step)

  numsteps = 6

  if step == numsteps + 2
    move_abs('I15_star', [-100, -100])
    return 2
  end
  if step == 0  # Break the light beam
    sparkle([-100, -100], 'I15_star')
    xy = [765, 621, 745, 621]
    @canvas.coords('I15', xy)
    return 1
  end
  x0, y0 = anchor('I15_s', :w)
  x1, y1 = anchor('I15_s', :e)
  x = x0 + (x1 - x0) * (step - 1) / numsteps.to_f
  move_abs('I15_star', [x, y0])
  return 1
end

#move15a ⇒ Object 



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# File 'sample/demos-en/goldberg.rb', line 1254

def move15a
  color = @C['15b']
  @canvas.scale('I15a', 824, 599, 1, 0.3)  # Button down
  xy = [765, 621, 681, 621]
  TkcLine.new(@canvas, xy, :dash=>'-', :width=>3, :fill=>color, :tag=>'I15')
end

#move16(step = nil) ⇒ Object 



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# File 'sample/demos-en/goldberg.rb', line 1300

def move16(step = nil)
  step = get_step(16, step)

  # Note: we never stop
  ox, oy = [760, 553]
  if (step & 1).nonzero?
    beta = 12
    @canvas.move('I16b', 3, 0)
  else
    beta = -12
    @canvas.move('I16b', -3, 0)
  end
  rotate_item('I16c', ox, oy, beta)
  rotate_item('I16d', ox, oy, beta)

  return ((step == 1)? 3: 1)
end

#move17(step = nil) ⇒ Object 



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# File 'sample/demos-en/goldberg.rb', line 1375

def move17(step = nil)
  step = get_step(17, step)

  if step == 0
    @canvas.delete('I17')  # Delete most of the cat
    xy = [655, 543, 660, 535, 665, 543]  # Mouth
    TkcLine.new(@canvas, xy, :fill=>@C['fg'], :width=>3,
                :smooth=>true, :tag=>'I17_')
    xy = box(654, 530, 4)  # Left eye
    TkcOval.new(@canvas, xy, :outline=>@C['fg'], :width=>3, :fill=>'',
                :tag=>'I17_')
    xy = box(666, 530, 4)  # Right eye
    TkcOval.new(@canvas, xy, :outline=>@C['fg'], :width=>3, :fill=>'',
                :tag=>'I17_')

    @canvas.move('I17_', 0, -20) # Move face up
    xy = [652, 528, 652, 554]    # Front leg
    TkcLine.new(@canvas, xy, :fill=>@C['fg'], :width=>3, :tag=>'I17_')
    xy = [670, 528, 670, 554]    # 2nd front leg
    TkcLine.new(@canvas, xy, :fill=>@C['fg'], :width=>3, :tag=>'I17_')

    xy = [ # Body
      675, 506, 694, 489, 715, 513, 715, 513, 715, 513, 716, 525,
      716, 525, 716, 525, 706, 530, 695, 530, 679, 535, 668, 527,
      668, 527, 668, 527, 675, 522, 676, 517, 677, 512
    ]
    TkcPolygon.new(@canvas, xy, :fill=>@canvas.itemcget('I17_c', :fill),
                   :outline=>@C['fg'], :width=>3, :smooth=>true,
                   :tag=>'I17_')
    xy = [716, 514, 716, 554]  # Back leg
    TkcLine.new(@canvas, xy, :fill=>@C['fg'], :width=>3, :tag=>'I17_')
    xy = [694, 532, 694, 554]  # 2nd back leg
    TkcLine.new(@canvas, xy, :fill=>@C['fg'], :width=>3, :tag=>'I17_')
    xy = [715, 514, 718, 506, 719, 495, 716, 488]  # Tail
    TkcLine.new(@canvas, xy, :fill=>@C['fg'], :width=>3,
                :smooth=>true, :tag=>'I17_')

    @canvas.raise('I17w')       # Make whiskers visible
    @canvas.move('I17_', -5, 0) # Move away from the wall a bit
    return 2
  end
  return 0
end

#move18(step = nil) ⇒ Object 



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# File 'sample/demos-en/goldberg.rb', line 1434

def move18(step = nil)
  step = get_step(18, step)

  pos = [
    [587, 506], [537, 506], [466, 506], [376, 506], [266, 506, :x],
    [136, 506], [16, 506], [-100, -100]
  ]

  b = []
  b[0] = [490, 502, 719, 507, 524, 512]  # Band collapsing
  b[1] = [
    491, 503, 524, 557, 563, 505, 559, 496, 546, 506, 551, 525,
    553, 536, 538, 534, 532, 519, 529, 499
  ]
  b[2] = [
    491, 503, 508, 563, 542, 533, 551, 526, 561, 539, 549, 550, 530, 500
  ]
  b[3] = [
    491, 503, 508, 563, 530, 554, 541, 562, 525, 568, 519, 544, 530, 501
  ]

  return 0 if step >= pos.length

  if step == 0
    @canvas.delete('I18')
    @canvas.itemconfigure('I18b', :smooth=>true)
  end
  if b[step]
    @canvas.coords('I18b', b[step])
  end

  where = pos[step]
  move_abs('I18a', where)
  return 3 if where[2] == :x
  return 1
end

#move19(step = nil) ⇒ Object 



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# File 'sample/demos-en/goldberg.rb', line 1543

def move19(step = nil)
  step = get_step(19, step)

   angles = [30, 30, 30]
  return 2 if step == angles.length
  ox, oy = centroid('I19a')
  rotate_item('I19b', ox, oy, angles[step])

  return 1
end

#move2(step = nil) ⇒ Object 



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# File 'sample/demos-en/goldberg.rb', line 520

def move2(step = nil)
  step = get_step(2, step)

  stages = [0, 0, 1, 2, 0, 2, 1, 0, 1, 2, 0, 2, 1]
  xy = []
  xy[0] = [
    686, 333, 692, 323, 682, 316, 674, 309, 671, 295, 668, 307,
    662, 318, 662, 328, 671, 336
  ]
  xy[1] = [
    687, 331, 698, 322, 703, 295, 680, 320, 668, 297, 663, 311,
    661, 327, 671, 335
  ]
  xy[2] = [
    686, 331, 704, 322, 688, 300, 678, 283, 678, 283, 674, 298,
    666, 309, 660, 324, 672, 336
  ]

  if step >= stages.length
    @canvas.delete('I2')
    return 0
  end

  if step == 0  # Rotate the match
    beta = 20

    ox, oy = anchor('I2_0', :s)  # Where to pivot

    i = 0
    until @canvas.find_withtag("I2_#{i}").empty?
      rotate_item("I2_#{i}", ox, oy, beta)
      i += 1
    end

    # For the flame
    TkcPolygon.new(@canvas, [], :tag=>'I2', :smooth=>true, :fill=>@C['2'])

    return 1
  end
  @canvas.coords('I2', xy[stages[step]])
  return ((step == 7)? 3: 1)
end

#move20(step = nil) ⇒ Object 



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# File 'sample/demos-en/goldberg.rb', line 1559

def move20(step = nil)
  step = get_step(20, step)

  pos  = [451, 462, 473, 484, 496, 504, 513, 523, 532]
  freq  = [20,  40,  40,  40,  40,  40,  40,  40,  40]
  pos = [
    [451, 20], [462, 40], [473, 40], [484, 40], [496, 40],
    [504, 40], [513, 40], [523, 40], [532, 40, :x]
  ]
  return 0 if step >= pos.length

  @canvas.delete('I20')
  where = pos[step]
  y, f = where
  h20(y, f)
  return 3 if where[2] == :x
  return 1
end

#move21(step = nil) ⇒ Object 



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# File 'sample/demos-en/goldberg.rb', line 1617

def move21(step = nil)
  step = get_step(21, step)

  numsteps = 30
  return 0 if step >= numsteps

  x1, y1, x2, y2 = @canvas.coords('I21b')
  # lx1, ly1, lx2, ly2 = @canvas.coords('I21t')
  lx1, ly1, lx2, ly2 = [183, 492, 243, 504]

  f = step / numsteps.to_f
  y2 = y2 - 3
  xx1 = x1 + (lx1 - x1) * f
  yy1 = y1 + (ly1 - y1) * f
  xx2 = x2 + (lx2 - x2) * f
  yy2 = y2 + (ly2 - y2) * f

  @canvas.itemconfigure('I21b', :fill=>@C['20'])
  @canvas.delete('I21w')
  TkcPolygon.new(@canvas, x2, y2, x1, y1, xx1, yy1, xx2, yy1,
                 :tag=>['I21', 'I21w'], :outline=>'', :fill=>@C['20'])
  @canvas.lower('I21w', 'I21')
  @canvas.raise('I21b')
  @canvas.lower('I21f')

  return((step == numsteps - 1)? 3: 1)
end

#move22(step = nil) ⇒ Object 



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# File 'sample/demos-en/goldberg.rb', line 1650

def move22(step = nil)
  step = get_step(22, step)
  pos = [[213, 513], [213, 523], [213, 543, :x], [213, 583], [213, 593]]

  @canvas.itemconfigure('I21f', :fill=>@C['22']) if step == 0
  return 0 if step >= pos.length
  where = pos[step]
  move_abs('I21', where)
  h20(where[1], 40)
  @canvas.delete('I21_a')  # Delete handles

  return 3 if where[2] == :x
  return 1
end

#move23(step = nil) ⇒ Object 



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# File 'sample/demos-en/goldberg.rb', line 1694

def move23(step = nil)
  step = get_step(23, step)

  pos = [
    [277, 607], [287, 607], [307, 607, :x], [347, 607], [407, 607],
    [487, 607], [587, 607], [687, 607], [787, 607], [-100, -100]
  ]

  return 0 if step >= pos.length
  if step <= 1
    ox, oy = anchor('I23a', :n)
    @canvas.scale('I23b', ox, oy, 0.9, 0.5)
  end
  where = pos[step]
  move_abs('I23d', where)

  return 3 if where[2] == :x
  return 1
end

#move24(step = nil) ⇒ Object 



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# File 'sample/demos-en/goldberg.rb', line 1740

def move24(step = nil)
  step = get_step(24, step)

  return 0 if step > 4
  return 2 if step == 4

  if step == 0
    @canvas.delete('I24')  # Exploding balloon
    xy = [
      347, 465, 361, 557, 271, 503, 272, 503, 342, 574, 259, 594,
      259, 593, 362, 626, 320, 737, 320, 740, 398, 691, 436, 738,
      436, 739, 476, 679, 528, 701, 527, 702, 494, 627, 548, 613,
      548, 613, 480, 574, 577, 473, 577, 473, 474, 538, 445, 508,
      431, 441, 431, 440, 400, 502, 347, 465, 347, 465
    ]
    TkcPolygon.new(@canvas, xy, :tag=>'I24', :fill=>@C['24b'],
                   :outline=>@C['24a'], :width=>10, :smooth=>true)
    msg = Tk.subst(@S['message'].value)
    TkcText.new(@canvas, centroid('I24'), :text=>msg, :tag=>['I24', 'I24t'],
                :justify=>:center, :font=>['Times Roman', 18, :bold])
    return 1
  end

  @canvas.itemconfigure('I24t', :font=>['Times Roman', 18 + 6*step, :bold])
  @canvas.move('I24', 0, -60)
  ox, oy = centroid('I24')
  @canvas.scale('I24', ox, oy, 1.25, 1.25)
  return 1
end

#move25(step = nil) ⇒ Object

Displaying the message



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# File 'sample/demos-en/goldberg.rb', line 1771

def move25(step = nil)
  step = get_step(25, step)

  if step == 0
    @XY['25'] = Tk::Clock.clicks(:miliseconds)
    return 1
  end
  elapsed = Tk::Clock.clicks(:miliseconds) - @XY['25']
  return 1 if elapsed < 5000
  return 2
end

#move26(step = nil) ⇒ Object

Collapsing balloon



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# File 'sample/demos-en/goldberg.rb', line 1784

def move26(step = nil)
  step = get_step(26, step)

  if step >= 3
    @canvas.delete('I24', 'I26')
    TkcText.new(@canvas, 430, 740, :anchor=>:s, :tag=>'I26',
                :text=>'click to continue',
                :font=>['Times Roman', 24, :bold])
    @canvas.bind('1', proc{reset})
    return 4
  end

  ox, oy = centroid('I24')
  @canvas.scale('I24', ox, oy, 0.8, 0.8)
  @canvas.move('I24', 0, 60)
  @canvas.itemconfigure('I24t', :font=>['Times Roman', 30 - 6*step, :bold])
  return 1
end

#move3(step = nil) ⇒ Object 



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# File 'sample/demos-en/goldberg.rb', line 619

def move3(step = nil)
  step = get_step(3, step)

  pos = [ [505, 247], [505, 297], [505, 386.5], [505, 386.5] ]
  rope = []
  rope[0] = [750, 309, 729, 301, 711, 324, 690, 300]
  rope[1] = [750, 309, 737, 292, 736, 335, 717, 315, 712, 320]
  rope[2] = [750, 309, 737, 309, 740, 343, 736, 351, 725, 340]
  rope[3] = [750, 309, 738, 321, 746, 345, 742, 356]

  return 0 if step >= pos.length

  @canvas.delete("I3_#{step}")        # Delete part of the rope
  move_abs('I3_', pos[step])          # Move weight down
  @canvas.coords('I3_s', rope[step])  # Flapping rope end
  @canvas.coords('I3_w', [505, 174].concat(pos[step]))
  if step == 2
    @canvas.move('I3__', 0, 30)
    return 2
  end
  return 1
end

#move4(step = nil) ⇒ Object 



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# File 'sample/demos-en/goldberg.rb', line 662

def move4(step = nil)
  step = get_step(4, step)

  angles = [-10, -20, -30, -30]
  return 0 if step >= angles.length

  rotate_item('I4', 518, 464, angles[step])
  @canvas.raise('I4')

  return((step == 3)? 3: 1)
end

#move5(step = nil) ⇒ Object 



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# File 'sample/demos-en/goldberg.rb', line 711

def move5(step = nil)
  step = get_step(5, step)

  pos = [
    [553, 452], [533, 452], [513, 452], [493, 452], [473, 452],
    [463, 442, 30], [445.5, 441.5, 30], [425.5, 434.5, 30], [422, 414],
    [422, 394], [422, 374], [422, 354], [422, 334], [422, 314], [422, 294],
    [422, 274, -30], [422, 260.5, -30, :x], [422.5, 248.5, -28], [425, 237]
  ]

  return 0 if step >= pos.length

  x, y, beta, nxt = pos[step]
  move_abs('I5', [x, y])
  if beta
    ox, oy = centroid('I5_0')
    (0..6).each{|id| rotate_item("I5_#{id}", ox, oy, beta) }
  end
  return 3 if nxt == :x
  return 1
end

#move6(step = nil) ⇒ Object 



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# File 'sample/demos-en/goldberg.rb', line 807

def move6(step = nil)
  step = get_step(6, step)

  return 0 if step > 62

  if step < 2  # Open gate for balls to drop
    @canvas.move('I6_', -7, 0)
    if step == 1  # Poke a hole
      xy = [348, 226, 365, 240]
      TkcRectangle.new(@canvas, xy, :fill=>@canvas.itemcget('I6c', :fill),
                       :outline=>'')
    end
    return 1
  end

  s = step - 1  # Do the gumball drop dance
  (0..(((s - 1)/3).to_i)).each{|i|
    tag = "I6_b#{i}"
    break if @canvas.find_withtag(tag).empty?
    loc = s - 3*i

    if @XY6["#{loc},#{i}"]
      move_abs(tag, @XY6["#{loc},#{i}"])
    elsif @XY6["#{loc}"]
      move_abs(tag, @XY6["#{loc}"])
    end
  }
  if s % 3 == 1
    first = (s + 2)/3
    i = first
    loop {
      tag = "I6_b#{i}"
      break if @canvas.find_withtag(tag).empty?
      loc = first - i
      move_abs(tag, @XY6["#{loc}"])
      i += 1
    }
  end
  if s >= 3  # Rotate the motor
    idx = s % 3
    draw6a(12 + s * 15)
  end
  return((s == 3)? 3 : 1)
end

#move7(step = nil) ⇒ Object 



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# File 'sample/demos-en/goldberg.rb', line 877

def move7(step = nil)
  step = get_step(7, step)

  numsteps = 30
  return 0 if step > numsteps
  beta = 30.0 / numsteps
  rotate_item('I7', 275, 343, beta)

  return((step == numsteps)? 3: 1)
end

#move8(step = nil) ⇒ Object 



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# File 'sample/demos-en/goldberg.rb', line 893

def move8(step = nil)
  step = get_step(8, step)

  return 0 if step > 3
  if step == 0
    sparkle(anchor('I8_s', :s), 'I8')
    return 1
  elsif step == 1
    move_abs('I8', anchor('I8_s', :c))
  elsif step == 2
    move_abs('I8', anchor('I8_s', :n))
  else
    @canvas.delete('I8')
  end
  return((step == 2)? 3: 1)
end

#move9(step = nil) ⇒ Object 



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# File 'sample/demos-en/goldberg.rb', line 940

def move9(step = nil)
  step = get_step(9, step)

  if (step & 1).nonzero?
    @canvas.itemconfigure('I9_0', :width=>4)
    @canvas.itemconfigure('I9_1', :width=>1)
    @canvas.lower('I9_1', 'I9_0')
  else
    @canvas.itemconfigure('I9_0', :width=>1)
    @canvas.itemconfigure('I9_1', :width=>4)
    @canvas.lower('I9_0', 'I9_1')
  end
  return 3 if step == 0
  return 1
end

#move_abs(item, xy) ⇒ Object 



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# File 'sample/demos-en/goldberg.rb', line 1811

def move_abs(item, xy)
  x, y = xy
  ox, oy = centroid(item)
  dx = x - ox
  dy = y - oy
  @canvas.move(item, dx, dy)
end

#next_step ⇒ Object 



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# File 'sample/demos-en/goldberg.rb', line 375

def next_step
  retval = false   # Return value

  if @S['mode'].to_sym != :MSTART && @S['mode'].to_sym != :MDONE
    @S['cnt'].numeric += 1
  end
  alive = []
  @S['active'].each{|who|
    who = who.to_i
    n = send("move#{who}")
    if (n & 1).nonzero?          # This guy still alive
      alive << who
    end
    if (n & 2).nonzero?          # Next guy is active
      alive << (who + 1)
      retval = true
    end
    if (n & 4).nonzero?          # End of puzzle flag
      @S['mode'].value = :MDONE  # Done mode
      @S['active'] = []          # No more animation
      return true
    end
  }
  @S['active'] = alive
  return retval
end

#reset ⇒ Object 



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# File 'sample/demos-en/goldberg.rb', line 1845

def reset
  draw_all
  @canvas.bind_remove('1')
  @S['mode'].value = :MSTART
  @S['active'] = [0]
end

#reset_step ⇒ Object 



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# File 'sample/demos-en/goldberg.rb', line 1866

def reset_step
  @S['cnt'].value = 0
  @STEP.keys.each{|k| @STEP[k] = ''}
end

#rotate_c(x, y, ox, oy, beta) ⇒ Object 



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# File 'sample/demos-en/goldberg.rb', line 1829

def rotate_c(x, y, ox, oy, beta)
  # rotates vector (ox,oy)->(x,y) by beta degrees clockwise

  x -= ox    # Shift to origin
  y -= oy

  beta = beta * Math.atan(1) * 4 / 180.0        # Radians
  xx = x * Math.cos(beta) - y * Math.sin(beta)  # Rotate
  yy = x * Math.sin(beta) + y * Math.cos(beta)

  xx += ox  # Shift back
  yy += oy

  [xx, yy]
end

#rotate_item(item, ox, oy, beta) ⇒ Object 



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# File 'sample/demos-en/goldberg.rb', line 1819

def rotate_item(item, ox, oy, beta)
  xy = @canvas.coords(item)
  xy2 = []
  0.step(xy.length - 1, 2){|idx|
    x, y = xy[idx, 2]
    xy2.concat(rotate_c(x, y, ox, oy, beta))
  }
  @canvas.coords(item, xy2)
end

#round_poly(canv, xy, radii, opts) ⇒ Object 



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# File 'sample/demos-en/goldberg.rb', line 1915

def round_poly(canv, xy, radii, opts)
  lenXY = xy.length
  lenR = radii.length
  if lenXY != 2*lenR
    raise "wrong number of vertices and radii"
  end

  knots = []
  x0 = xy[-2]; y0 = xy[-1]
  x1 = xy[0];  y1 = xy[1]
  xy << xy[0] << xy[1]

  0.step(lenXY - 1, 2){|i|
    radius = radii[i/2]
    r = canv.winfo_pixels(radius)

    x2 = xy[i+2];  y2 = xy[i+3]
    z = _round_poly2(x0, y0, x1, y1, x2, y2, r)
    knots.concat(z)

    x0 = x1;  y0 = y1
    x1 = x2;  y1 = y2
  }
  TkcPolygon.new(canv, knots, {:smooth=>true}.update(opts))
end

#round_rect(xy, radius, opts = {}) ⇒ Object 



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# File 'sample/demos-en/goldberg.rb', line 1891

def round_rect(xy, radius, opts={})
  x0, y0, x3, y3 = xy
  r = @canvas.winfo_pixels(radius)
  d = 2 * r

  # Make sure that the radius of the curve is less than 3/8 size of the box!
  maxr = 0.75
  if d > maxr * (x3 - x0)
    d = maxr * (x3 - x0)
  end
  if d > maxr * (y3 - y0)
    d = maxr * (y3 - y0)
  end

  x1 = x0 + d
  x2 = x3 - d
  y1 = y0 + d
  y2 = y3 - d

  xy = [x0, y0, x1, y0, x2, y0, x3, y0, x3, y1, x3, y2]
  xy.concat([x3, y3, x2, y3, x1, y3, x0, y3, x0, y2, x0, y1])
  return xy
end

#show_ctrl ⇒ Object 



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# File 'sample/demos-en/goldberg.rb', line 293

def show_ctrl
  if @ctrl.winfo_mapped?
    @ctrl.pack_forget
    @show.text('>>')
  else
    @ctrl.pack(:side=>:right, :fill=>:both, :ipady=>5)
    @show.text('<<')
  end
end

#sine(xy0, amp, freq, opts = {}) ⇒ Object 



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# File 'sample/demos-en/goldberg.rb', line 1871

def sine(xy0, amp, freq, opts = {})
  x0, y0, x1, y1 = xy0
  step = 2
  xy = []
  if y0 == y1  # Horizontal
    x0.step(x1, step){|x|
      beta = (x - x0) * 2 * Math::PI / freq
      y = y0 + amp * Math.sin(beta)
      xy << x << y
    }
  else
    y0.step(y1, step){|y|
      beta = (y - y0) * 2 * Math::PI / freq
      x = x0 + amp * Math.sin(beta)
      xy << x << y
    }
  end
  TkcLine.new(@canvas, xy, opts)
end

#sparkle(oxy, tag) ⇒ Object 



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# File 'sample/demos-en/goldberg.rb', line 1968

def sparkle(oxy, tag)
  xy = [
    [299, 283], [298, 302], [295, 314], [271, 331],
    [239, 310], [242, 292], [256, 274], [281, 273]
  ]
  xy.each{|x, y|
    TkcLine.new(@canvas, 271, 304, x, y,
                :fill=>'white', :width=>3, :tag=>tag)
  }
  move_abs(tag, oxy)
end

#start ⇒ Object 



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# File 'sample/demos-en/goldberg.rb', line 334

def start
  @S['mode'].value = :MGO
end