#
# arrowhead widget demo (called by 'widget')
#

# arrowSetup --
# This method regenerates all the text and graphics in the canvas
# window.  It's called when the canvas is initially created, and also
# whenever any of the parameters of the arrow head are changed
# interactively.
#
# Arguments:
# c -           Name of the canvas widget.

def arrowSetup(c)
  v = $demo_arrowInfo

  # Remember the current box, if there is one.
  tags = c.gettags('current')
  if tags != []
    cur = tags.find{|t| t.kind_of?(String) && t =~ /^box[1-3]$/ }
  else
    cur = nil
  end

  # Create the arrow and outline.
  c.delete('all')
  TkcLine.new(c, v.x1, v.y, v.x2, v.y, 
              { 'width'=>10 * v.width, 
                'arrowshape'=>[10*v.a, 10*v.b, 10*v.c], 
                'arrow'=>'last' 
              }.update(v.bigLineStyle) )
  xtip = v.x2 - 10*v.b
  deltaY = 10*v.c + 5*v.width
  TkcLine.new(c, v.x2, v.y, xtip, v.y + deltaY, 
              v.x2 - 10*v.a, v.y, xtip, v.y - deltaY, v.x2, v.y, 
              'width'=>2, 'capstyle'=>'round', 'joinstyle'=>'round')

  # Create the boxes for reshaping the line and arrowhead.
  TkcRectangle.new(c, v.x2-10*v.a-5, v.y-5, v.x2-10*v.a+5, v.y+5, 
                   {'tags'=>['box1', $arrowTag_box]}.update(v.boxStyle) )
  TkcRectangle.new(c, xtip-5, v.y-deltaY-5, xtip+5, v.y-deltaY+5, 
                   {'tags'=>['box2', $arrowTag_box]}.update(v.boxStyle) )
  TkcRectangle.new(c, v.x1-5, v.y-5*v.width-5, v.x1+5, v.y-5*v.width+5, 
                   {'tags'=>['box3', $arrowTag_box]}.update(v.boxStyle) )
  c.itemconfigure cur, v.activeStyle if cur

  # Create three arrows in actual size with the same parameters
  TkcLine.new(c, v.x2+50, 0, v.x2+50, 1000, 'width'=>2)
  tmp = v.x2+100
  TkcLine.new(c, tmp, v.y-125, tmp, v.y-75, 'width'=>v.width, 
              'arrow'=>'both', 'arrowshape'=>[v.a, v.b, v.c])
  TkcLine.new(c, tmp-25, v.y, tmp+25, v.y, 'width'=>v.width, 
              'arrow'=>'both', 'arrowshape'=>[v.a, v.b, v.c])
  TkcLine.new(c, tmp-25, v.y+75, tmp+25, v.y+125, 'width'=>v.width, 
              'arrow'=>'both', 'arrowshape'=>[v.a, v.b, v.c])

  # Create a bunch of other arrows and text items showing the 
  # current dimensions.
  tmp = v.x2+10
  TkcLine.new(c, tmp, v.y-5*v.width, tmp, v.y-deltaY, 
              'arrow'=>'both', 'arrowshape'=>v.smallTips)
  TkcText.new(c, v.x2+15, v.y-deltaY+5*v.c, 'text'=>v.c, 'anchor'=>'w')
  tmp = v.x1-10
  TkcLine.new(c, tmp, v.y-5*v.width, tmp, v.y+5*v.width, 
              'arrow'=>'both', 'arrowshape'=>v.smallTips)
  TkcText.new(c, v.x1-15, v.y, 'text'=>v.width, 'anchor'=>'e')
  tmp = v.y+5*v.width+10*v.c+10
  TkcLine.new(c, v.x2-10*v.a, tmp, v.x2, tmp, 
              'arrow'=>'both', 'arrowshape'=>v.smallTips)
  TkcText.new(c, v.x2-5*v.a, tmp+5, 'text'=>v.a, 'anchor'=>'n')
  tmp = tmp+25
  TkcLine.new(c, v.x2-10*v.b, tmp, v.x2, tmp, 
              'arrow'=>'both', 'arrowshape'=>v.smallTips)
  TkcText.new(c, v.x2-5*v.b, tmp+5, 'text'=>v.b, 'anchor'=>'n')

  TkcText.new(c, v.x1, 310, 'text'=>"'width'=>#{v.width}", 'anchor'=>'w', 
              'font'=>'-*-Helvetica-Medium-R-Normal--*-180-*-*-*-*-*-*')
  TkcText.new(c, v.x1, 330, 
              'text'=>"'arrowshape'=>[#{v.a}, #{v.b}, #{v.c}]", 'anchor'=>'w', 
              'font'=>'-*-Helvetica-Medium-R-Normal--*-180-*-*-*-*-*-*')

  v.count += 1
end

# toplevel widget ¸ߤк
if defined?($arrow_demo) && $arrow_demo
  $arrow_demo.destroy 
  $arrow_demo = nil
end

# demo Ѥ toplevel widget 
$arrow_demo = TkToplevel.new {|w|
  title("Arrowhead Editor Demonstration")
  iconname("arrow")
  positionWindow(w)
}

# label 
TkLabel.new($arrow_demo, 'font'=>$font, 'wraplength'=>'5i', 'justify'=>'left', 
            'text'=>" widget ǡХǻȤ饤ˤĤ͡ƬηƤߤ뤳ȤǤޤηѤˤϡ礵줿ˤĤƤ 3ĤλͳѤɥåƤ¦̤礭ǤΥץ򼨤ƤޤΥƥȤϥ饤󥢥ƥФꥪץǤ"){
  pack('side'=>'top')
}

# frame 
$arrow_buttons = TkFrame.new($arrow_demo) {|frame|
  TkButton.new(frame) {
    #text 'λ'
    text 'Ĥ'
    command proc{
      tmppath = $arrow_demo
      $arrow_demo = nil
      tmppath.destroy
    }
  }.pack('side'=>'left', 'expand'=>'yes')

  TkButton.new(frame) {
    text 'ɻ'
    command proc{showCode 'arrow'}
  }.pack('side'=>'left', 'expand'=>'yes')
}
$arrow_buttons.pack('side'=>'bottom', 'fill'=>'x', 'pady'=>'2m')

# canvas 
$arrow_canvas = TkCanvas.new($arrow_demo, 'width'=>500, 'height'=>350, 
                             'relief'=>'sunken', 'borderwidth'=>2)
$arrow_canvas.pack('expand'=>'yes', 'fill'=>'both')

# 
unless Struct.const_defined?("ArrowInfo")
  $demo_arrowInfo = Struct.new("ArrowInfo", :a, :b, :c, :width, :motionProc, 
                               :x1, :x2, :y, :smallTips, :count, 
                               :bigLineStyle, :boxStyle, :activeStyle).new
end
$demo_arrowInfo.a = 8
$demo_arrowInfo.b = 10
$demo_arrowInfo.c = 3
$demo_arrowInfo.width = 2
$demo_arrowInfo.motionProc = proc{}
$demo_arrowInfo.x1 = 40
$demo_arrowInfo.x2 = 350
$demo_arrowInfo.y = 150
$demo_arrowInfo.smallTips = [5, 5, 2]
$demo_arrowInfo.count = 0
if TkWinfo.depth($arrow_canvas) > 1
  $demo_arrowInfo.bigLineStyle = {'fill'=>'SkyBlue1'}
  $demo_arrowInfo.boxStyle = {'fill'=>'', 'outline'=>'black', 'width'=>1}
  $demo_arrowInfo.activeStyle = {'fill'=>'red', 'outline'=>'black', 'width'=>1}
else
  $demo_arrowInfo.bigLineStyle = {'fill'=>'black', 
    'stipple'=>'@'+[$demo_dir,'..','images','grey.25'].join(File::Separator)}
  $demo_arrowInfo.boxStyle = {'fill'=>'', 'outline'=>'black', 'width'=>1}
  $demo_arrowInfo.activeStyle = {'fill'=>'black','outline'=>'black','width'=>1}
end
$arrowTag_box = TkcTag.new($arrow_canvas)
arrowSetup $arrow_canvas
$arrowTag_box.bind('Enter', proc{$arrow_canvas.itemconfigure('current', $demo_arrowInfo.activeStyle)})
$arrowTag_box.bind('Leave', proc{$arrow_canvas.itemconfigure('current', $demo_arrowInfo.boxStyle)})
$arrowTag_box.bind('B1-Enter', proc{})
$arrowTag_box.bind('B1-Leave', proc{})
$arrow_canvas.itembind('box1', '1', 
                       proc{$demo_arrowInfo.motionProc \
                         = proc{|x,y| arrowMove1 $arrow_canvas, x, y}})
$arrow_canvas.itembind('box2', '1', 
                       proc{$demo_arrowInfo.motionProc \
                         = proc{|x,y| arrowMove2 $arrow_canvas, x, y}})
$arrow_canvas.itembind('box3', '1', 
                       proc{$demo_arrowInfo.motionProc \
                         = proc{|x,y| arrowMove3 $arrow_canvas, x, y}})
$arrowTag_box.bind('B1-Motion', 
                  proc{|x,y| $demo_arrowInfo.motionProc.call(x,y)}, "%x %y")
$arrow_canvas.bind('Any-ButtonRelease-1', proc{arrowSetup $arrow_canvas})

# arrowMove1 --
# This method is called for each mouse motion event on box1 (the
# one at the vertex of the arrow).  It updates the controlling parameters
# for the line and arrowhead.
#
# Arguments:
# c -           The name of the canvas window.
# x, y -        The coordinates of the mouse.

def arrowMove1(c,x,y)
  v = $demo_arrowInfo
  newA = (v.x2+5-c.canvasx(x).round)/10
  newA = 0 if newA < 0
  newA = 25 if newA > 25
  if newA != v.a
    c.move('box1', 10*(v.a-newA), 0)
    v.a = newA
  end
end

# arrowMove2 --
# This method is called for each mouse motion event on box2 (the
# one at the trailing tip of the arrowhead).  It updates the controlling
# parameters for the line and arrowhead.
#
# Arguments:
# c -           The name of the canvas window.
# x, y -        The coordinates of the mouse.

def arrowMove2(c,x,y)
  v = $demo_arrowInfo
  newB = (v.x2+5-c.canvasx(x).round)/10
  newB = 0 if newB < 0
  newB = 25 if newB > 25
  newC = (v.y+5-c.canvasy(y).round-5*v.width)/10
  newC = 0 if newC < 0
  newC = 20 if newC > 20
  if newB != v.b || newC != v.c
    c.move('box2', 10*(v.b-newB), 10*(v.c-newC))
    v.b = newB
    v.c = newC
  end
end

# arrowMove3 --
# This method is called for each mouse motion event on box3 (the
# one that controls the thickness of the line).  It updates the
# controlling parameters for the line and arrowhead.
#
# Arguments:
# c -           The name of the canvas window.
# x, y -        The coordinates of the mouse.

def arrowMove3(c,x,y)
  v = $demo_arrowInfo
  newWidth = (v.y+2-c.canvasy(y).round)/5
  newWidth = 0 if newWidth < 0
  newWidth = 20 if newWidth > 20
  if newWidth != v.width
    c.move('box3', 0, 5*(v.width-newWidth))
    v.width = newWidth
  end
end

