Module: BarPlot

Defined in:
lib/rbbt/plots/bar.rb

Constant Summary collapse

COLORS = 
{
  :red =>   PNG::Color::Red,
  :green => PNG::Color::Green,
  :blue => PNG::Color::Blue,
  :white => PNG::Color::White,
  :black => PNG::Color::Black,
  :gray => PNG::Color::Gray,
  :yellow => PNG::Color::Yellow,
}
MAX_WIDTH = 
2000

Class Method Summary collapse

Class Method Details

.draw(items, total, options = {}) ⇒ Object 



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# File 'lib/rbbt/plots/bar.rb', line 129

def self.draw(items, total, options = {})
  options = options.merge :total => total
  canvas = get_canvas(options)
  items = [items] if Range === items
  return canvas if items.empty? and options[:filename].nil?

  color = options.delete(:color) || PNG::Color::Black
  if Range === items.first
    draw_sections_on_canvas(items, total, canvas, color)
  else
    draw_hits_on_canvas(items, total, canvas, color)
  end

  case options[:filename]
  when :string
    PNG.new(canvas).to_blob
  when nil
    canvas
  else
    PNG.new(canvas).save options[:filename]
  end
end

.draw_hits_on_canvas(hits, total, canvas, color = PNG::Color::Black) ⇒ Object 



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# File 'lib/rbbt/plots/bar.rb', line 62

def self.draw_hits_on_canvas(hits, total, canvas, color = PNG::Color::Black)
  width = canvas.width
  height = canvas.height

  # fix hits
  hits = hits.collect{|h| h - 1} # make it start at 0

  if width < total
    hits = hits.collect{|h| (h.to_f * width / total).floor}
  end

  if Array === color
    hits.zip(color).each{|hit, color|
      canvas.line hit, 0, hit , height - 1, get_color(color)
    }
  else
    color = get_color color
    hits.each{|hit|
      canvas.line hit, 0, hit , height - 1, color
    }
  end

  canvas
end

.draw_sections_on_canvas(ranges, total, canvas, color = PNG::Color::Black) ⇒ Object 



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# File 'lib/rbbt/plots/bar.rb', line 87

def self.draw_sections_on_canvas(ranges, total, canvas, color = PNG::Color::Black)
  width = canvas.width
  height = canvas.height

  # fix hits
  ranges = ranges.collect{|r| (r.begin-1..r.end)} # make it start at 0

  if width < total
    ratio = width.to_f / total
    ranges = ranges.collect{|range| ((range.begin.to_f*ratio).floor..(range.end.to_f*ratio).floor)} # make it start at 0
  end

  if Array === color
    ranges.zip(color).each{|range, color|
      range.each do |hit|
        canvas.line hit, 0, hit , height - 1, get_color(color)
      end
    }
  else
    color = get_color color
    ranges.each{|range|
      range.each do |hit|
        canvas.line hit, 0, hit , height - 1, color
      end
    }
  end

  canvas
end

.get_canvas(options = {}) ⇒ Object 



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# File 'lib/rbbt/plots/bar.rb', line 118

def self.get_canvas(options = {})
  options = Misc.add_defaults options, :width => [options[:total], MAX_WIDTH].min, :height => 20, :background => PNG::Color::White
  width, height, background, canvas = Misc.process_options options, :width, :height, :background, :canvas

  canvas ||= if options[:update] and options[:filename] and File.exists? options[:filename]
               PNG.load_file options[:filename]
             else
               PNG::Canvas.new width, height, get_color(background) 
             end
end

.get_color(color) ⇒ Object 



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# File 'lib/rbbt/plots/bar.rb', line 16

def self.get_color(color)
  return color if PNG::Color === color
  return COLORS[color] if COLORS.include? color
  PNG::Color.from(color)
end

.gradient_color(values, options = {}) ⇒ Object 



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# File 'lib/rbbt/plots/bar.rb', line 22

def self.gradient_color(values, options = {})
  options = Misc.add_defaults options, :start_color => :green, :end_color => :red, :missing_color => :blue
  start_color, end_color, missing_color = Misc.process_options options, :start_color, :end_color, :missing_color

  start_color = get_color start_color 
  end_color = get_color end_color
  
  max = values.reject{|v| v.nan? || v.infinite?}.max
  min = values.reject{|v| v.nan? || v.infinite?}.min

  case
  when (max.nil? or min.nil?)
    return [missing_color] * values.length 
  when max == min
    return [end_color] * values.length 
  else
    diff = max - min

    r_start = start_color.r
    g_start = start_color.g
    b_start = start_color.b

    r_end = end_color.r
    g_end = end_color.g
    b_end = end_color.b

    values.collect{|v|
      if v.infinite? or v.nan?
        missing_color
      else
        ratio = (255 * (v - min)) / diff
        r = (r_start.to_f * (1-ratio) + (r_end.to_f * ratio)).to_i
        b = (b_start.to_f * (1-ratio) + (b_end.to_f * ratio)).to_i
        g = (g_start.to_f * (1-ratio) + (g_end.to_f * ratio)).to_i
        PNG::Color.new(r, g, b)
      end
    }
  end
end