Class: Tk::ParallelCoordinates

Inherits:
Object
  • Object
show all
Defined in:
lib/tk/parallelcoordinates.rb,
lib/tk/parallelcoordinates/version.rb

Constant Summary collapse

STATE_NORMAL = 
0
STATE_FILTERED = 
1
STATE_SELECTED = 
2
STATE_CURRENT = 
3
STATES = 
[ 'normal', 'filtered', 'selected', 'current' ]
VERSION = 
"0.1.1"
@@default_colors = 
{
  'labels'   => 'grey75',
  'axis'     => 'steelblue',
  'labels'   => 'steelblue',
  'selector' => 'red',
  'state'    => [ 'grey70', 'grey40', '#999900', 'purple' ]
}
@@scales_in = 
{
  'lin' => proc { |x| x },
  'log' => proc { |x| (x<=0) ? 0 : Math.log(x) },
  'log2' => proc { |x| (x<=0) ? 0 : Math.log(x)/Math.log(2) },
  'log10' => proc { |x| Math.log10(x) },
  'sqrt' => proc { |x| Math.sqrt(x) },
  '3rt' => proc { |x| x ** (1/3.0) },
}
@@scales_out = 
{
  'lin' => proc { |x| x },
  'log' => proc { |x| Math.exp(x) },
  'log2' => proc { |x| 2 ** x },
  'log10' => proc { |x| 10 ** x },
  'sqrt' => proc { |x| x ** 2 },
  '3rt' => proc { |x| x ** 3 },
}

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(parent, h, w, model) ⇒ ParallelCoordinates

Returns a new instance of ParallelCoordinates.



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# File 'lib/tk/parallelcoordinates.rb', line 51

def initialize(parent, h, w, model)
  @model = model
  @canvas = TkCanvas.new(parent) {
    height h
    width w
  }
  @canvas.pack 
  @left_margin = 50
  @right_margin = w - 90
  @top_margin = 10
  @bottom_margin = h - 10
  @draw_width = @right_margin - @left_margin
  @draw_height = @bottom_margin - @top_margin
  @canvas.bind("1", proc{|e| do_press(e.x, e.y)})
  @canvas.bind("B1-Motion", proc{|x, y| do_motion(x, y)}, "%x %y")
  @canvas.bind("ButtonRelease-1", proc{|x, y| do_release(x, y)}, "%x %y")
  @colors = @@default_colors
  @tuples = {}
  @field_separator = ":"
  draw_axis
end

Instance Attribute Details

#field_separator ⇒ Object

Returns the value of attribute field_separator.



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# File 'lib/tk/parallelcoordinates.rb', line 49

def field_separator
  @field_separator
end

Instance Method Details

#addtuple(tuple, key = tuple.join(@field_separator), state = STATE_NORMAL) ⇒ Object 



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# File 'lib/tk/parallelcoordinates.rb', line 89

def addtuple(tuple,key=tuple.join(@field_separator),state=STATE_NORMAL)
  if tuple.length != @model.length
    puts "grr... what do I do now?  the tuple you gave me is a different length than the number of axes I have"
    return
  end
  axis = 0
  cx = cy = 0
  tuple.each do |item|
    x = axis2x(axis)
    y = item2y(axis, item)
    if cx > 0
      TkcLine.new(@canvas, cx, cy, x, y, :tags => [ key ], :fill => @colors['state'][state] )
    end
    cx = x
    cy = y
    axis += 1
  end
  @tuples[key] = [state,tuple]
end

#addtuples(tuples) ⇒ Object 



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# File 'lib/tk/parallelcoordinates.rb', line 109

def addtuples(tuples)
  tuples.each do |tuple|
    addtuple(tuple)
  end
end

#axis2x(axis) ⇒ Object 



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# File 'lib/tk/parallelcoordinates.rb', line 115

def axis2x(axis)
  @model[axis][:x]
end

#do_motion(x, y) ⇒ Object 



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# File 'lib/tk/parallelcoordinates.rb', line 235

def do_motion(x, y)
  if @current_rect
    @current_rect.coords @start_x, @start_y, x, y
    @canvas.itemconfigure 'selected', :fill => @colors['state'][STATE_NORMAL]
    @canvas.dtag 'selected'
    @canvas.addtag_overlapping 'selected', @start_x, @start_y, x, y
    @canvas.itemconfigure 'selected', :fill => @colors['state'][STATE_SELECTED]
    @current_rect.fill = ''
    @canvas.itemconfigure 'axis', :fill => @colors['axis']
    @canvas.itemconfigure 'axislabel', :fill => @colors['labels']
    # the below is slow, we need to find a faster way
    @tuples.each do |k,t|
      if t[0] == STATE_FILTERED
        @canvas.itemconfigure k, :fill => @colors['state'][STATE_FILTERED]
      end
    end
  end
end

#do_press(x, y) ⇒ Object 



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# File 'lib/tk/parallelcoordinates.rb', line 229

def do_press(x, y)
  @start_x = x
  @start_y = y
  @current_rect = TkcRectangle.new(@canvas, x, y, x, y, :dash => '-', :outline => @colors['selector'])
end

#do_release(x, y) ⇒ Object 



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# File 'lib/tk/parallelcoordinates.rb', line 254

def do_release(x, y)
  if @current_rect
    #@canvas.addtag_overlapping 'selected', @start_x, @start_y, x, y
    #@canvas.itemconfigure 'selected', :fill => @colors['state'][STATE_SELECTED]
    @current_rect.delete
    @current_rect = nil
    tuples = []
    items = @canvas.find_withtag 'selected'
    items.each do |item|
      item.gettags.each do |tag|
        if tag =~ /\:/
          if @tuples[tag] == nil or @tuples[tag][0] != STATE_FILTERED
            tuples.push( tag.split(/#{@field_separator}/) )
          end
        end
      end
    end
    @select_cb.call(tuples) if @select_cb and tuples.length > 0
  end
end

#draw_axis ⇒ Object 



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# File 'lib/tk/parallelcoordinates.rb', line 148

def draw_axis
  axes = @model.length
  axes_spacing = @draw_width / (axes - 1.0)
  offset = @left_margin
  axis = 0
  @model.each do |m|
    m[:x] = offset
    #puts "#{offset} #{@top_margin} #{offset} #{@bottom_margin}"
    TkcLine.new(@canvas, offset, @top_margin, offset, @bottom_margin, :tags => ['axis'], :fill => @colors['axis'])
    offset += axes_spacing
    # lin, log, log10, sqrt, 3rt
    if m[:type] == 'range'
      scale = m[:scale]
      s_in = @@scales_in[scale]
      s_out = @@scales_out[scale]
      min = s_in.call m[:min]
      max = s_in.call m[:max]
      del = max - min
      if m[:items]
        m[:items].each do |itemx|
          item = s_in.call itemx
          y = @top_margin + (@draw_height * ((item - min)/(del - min)))
          text = itemx
          text = sprintf m[:ofmt], text if m[:ofmt]
          TkcText.new(@canvas, m[:x], y, :text => text, :anchor => (axis==0) ? 'e' : 'w', :fill => @colors['labels'], :tags => ['axislabel'])
        end
      else
        points = m[:points] || 20.0
        step = del / points.to_f
        item = min
        items = []
        ctext = nil
        (0..points).each do |i|
          y = @top_margin + (@draw_height * ((item - min)/(del - min)))
          text = s_out.call(item)
          text = sprintf m[:ofmt], text if m[:ofmt]
          unless text == ctext
            TkcText.new(@canvas, m[:x], y, :text => text, :anchor => (axis==0) ? 'e' : 'w', :fill => @colors['labels'], :tags => ['axislabel'])
          end
          ctext = text
          items.push item
          item += step
        end
        m[:items] = items
      end
    elsif m[:type] == 'list'
      # skip helps to mitigate overlap.  10.0 is what I assume the font size to be
      skip = (((m[:list].length * 10.0)/@draw_height) + 1).to_i
      item = 0
      items = []
      m[:list].each do |i|
        if item % skip == 0
          y = @top_margin + (@draw_height * (item.to_f/m[:list].length))
          i = sprintf m[:ofmt], i if m[:ofmt]
          TkcText.new(@canvas, m[:x], y, :text => i, :anchor => (axis==0) ? 'e' : 'w', :fill => @colors['labels'], :tags => ['axislabel'])
          items.push i
        end
        item += 1
      end
    elsif m[:type] == 'date'
      min = Date.strptime(m[:min],m[:ifmt])
      max = Date.strptime(m[:max],m[:ifmt])
      item = min
      del = (max - min).to_i
      points = m[:points] || 20.0
      step = del / points.to_f
      (0..points).each do |i|
        y = @top_margin + (@draw_height * (item - min)/(del - min))
        text = item.strftime m[:ofmt]
        TkcText.new(@canvas, m[:x], y, :text => text, :anchor => (axis==0) ? 'e' : 'w', :fill => @colors['labels'], :tags => ['axislabel'])
        item += step
      end
    end
    axis += 1
  end
end

#item2y(axis, item) ⇒ Object 



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# File 'lib/tk/parallelcoordinates.rb', line 119

def item2y(axis, item)
  m = @model[axis]
  if m[:type] == 'range'
    scale = m[:scale]
    s_in = @@scales_in[scale]
    s_out = @@scales_out[scale]
    min = s_in.call m[:min]
    max = s_in.call m[:max]
    del = max - min
    y = @top_margin + (@draw_height * ((s_in.call(item) - min)/(del - min)))
    return y
  elsif m[:type] == 'list'
    c = 0
    m[:list].each do |i|
      break if item == i
      c += 1
    end
    y = @top_margin + (@draw_height * (c.to_f/m[:list].length))
    return y
  elsif m[:type] == 'date'
    raise "I must have fmt_in and fmt_out for a time axis.  Use the strftime codes for formatting.  E.g., %s => unix timestamp, %Y-%m-%d => SQL date (2007-12-12)" if m[:ifmt] == nil
    min = Date.strptime(m[:min],m[:ifmt])
    max = Date.strptime(m[:max],m[:ifmt])
    del = (max - min).to_i
    y = @top_margin + (@draw_height * ((Date.strptime(item,m[:ifmt]) - min)/(del - min)))
    return y
  end
end

#pack(*args) ⇒ Object 



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# File 'lib/tk/parallelcoordinates.rb', line 73

def pack(*args)
  @canvas.pack(*args)
end

#set_select_cb(callback) ⇒ Object 



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# File 'lib/tk/parallelcoordinates.rb', line 225

def set_select_cb(callback)
  @select_cb = callback
end

#set_tuple_state(key, state) ⇒ Object 



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# File 'lib/tk/parallelcoordinates.rb', line 83

def set_tuple_state(key,state)
  @canvas.itemconfigure key, :fill => @colors['state'][state]
  @tuples[key][0] = state
  @canvas.raise key, 'all'
end

#setPalette(*args) ⇒ Object 



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# File 'lib/tk/parallelcoordinates.rb', line 275

def setPalette(*args)
  return unless args.length > 0
  args[0].each do |k,v|
    @colors[k] = v
  end
end

#update ⇒ Object 



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# File 'lib/tk/parallelcoordinates.rb', line 77

def update
  @tuples.each do |k,t|
    @canvas.itemconfigure k, :fill => @colors['state'][t[0]]
  end
end