Class: Geniact::Graphics::Glyph

Inherits:
Object
  • Object
show all
Defined in:
lib/geniact/graphics/glyph.rb

Overview

A glyph is a particular shape that represents a genomic feature. Bio::Graphics::Glyph objects represent glyphs. Bio::Graphics::Glyphs are created internally according to specification from the Bio::Graphics::Track and not instantiated directly by the user. Internally, these are constructed as an array of Bio::Graphics::Primitive objects, which are collections of simple shapes, combined appropriately to make a glyph

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Attribute Details

#glyphs ⇒ Object (readonly)

The different type of Glyphs are:

  • :generic

  • :circle

  • :directed

  • :down_triangle

  • :up_triangle

  • :span

  • :transcript

  • :scale

  • :label

  • :histogram



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# File 'lib/geniact/graphics/glyph.rb', line 21

def glyphs
  @glyphs
end

Class Method Details

.circle(args) ⇒ Object

A circular glyph centered on the start of the feature it represents

args

  • :radius = the radius of the circle (default = 10)

  • :fill_color = the fill colour of the Glyph (default = ‘red’), can be any SVG colour eg rgb(256,0,0) or #FF0000, or one of the built in gradient types Bio::Graphics::Glyph#gradients

:red_white_h, :green_white_h, :blue_white_h, :yellow_white_h, :red_white_radial, :green_white_radial, :blue_white_radial, :yellow_white_radial

or a custom definition of a gradient {:type => :radial, :id => :custom, :cx => 5, :cy => 5, :r => 50, :fx => 50, :fy => 50,

:stops => [ {
     :offset => 0,
     :color => 'rgb(255,255,255)',
     :opacity => 0
     },  {
     :offset => 100,
     :color => 'rgb(0,127,200)',
     :opacity => 1
     }, ]

} #* :stroke = the outline colour of the Glyph (default = “black”), can be any SVG colour eg rgb(256,0,0) or #FF0000

  • :stroke_width = The width of the outline stroke (default = 1), can be any SVG colour eg rgb(256,0,0) or #FF0000

  • :style = an arbitrary SVG compliant style string eg “fill-opacity:0.4;”

  • :x = base x coordinate of the feature in pixels, usually added by the Bio::Graphics::Page object

  • :y = base y coordinate of the feature in pixels, usually added by the Bio::Graphics::Page object

returns

  • An Array of Bio::Graphic::Primitive objects



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# File 'lib/geniact/graphics/glyph.rb', line 103

def self.circle(args)
  args = {
      :radius => 10,
      :fill_color => 'red',
      :stroke => "black",
      :stroke_width => 1,
      :style => ""}.merge!(args)
  args[:x_center] = args[:x]
  args[:y_center] = args[:y]
  [:x, :y].each { |e| args.delete(e) }
  [Geniact::Graphics::Primitive.new(:circle, args)]
end

.directed(args) ⇒ Object

A polygon glyph with a point on the end that represents the features strand and direction

args

  • :width = the width of the feature in px

  • :fill_color = the fill colour of the Glyph (default = ‘red’), can be any SVG colour eg rgb(256,0,0) or #FF0000, or one of the built in gradient types Bio::Graphics::Glyph#gradients

:red_white_h, :green_white_h, :blue_white_h, :yellow_white_h, :red_white_radial, :green_white_radial, :blue_white_radial, :yellow_white_radial

or a custom definition of a gradient {:type => :radial, :id => :custom, :cx => 5, :cy => 5, :r => 50, :fx => 50, :fy => 50,

:stops => [ {
     :offset => 0,
     :color => 'rgb(255,255,255)',
     :opacity => 0
     },  {
     :offset => 100,
     :color => 'rgb(0,127,200)',
     :opacity => 1
     }, ]

}

  • :stroke = the outline colour of the Glyph (default = “black”), can be any SVG colour eg rgb(256,0,0) or #FF0000

  • :stroke_width = The width of the outline stroke (default = 1), can be any SVG colour eg rgb(256,0,0) or #FF0000

  • :style = an arbitrary SVG compliant style string eg “fill-opacity:0.4;”

  • :strand = the strand on which the feature is located. May be ‘+’ or ‘-’

  • :points = the x and y axis coordinates that make up the corners of the polygon, calculated and added by the Bio::Graphics::Page object

  • :x = base x coordinate of the feature in pixels, usually added by the Bio::Graphics::Page object

  • :y = base y coordinate of the feature in pixels, usually added by the Bio::Graphics::Page object

The points of the polygon are calculated form the :x and :y co-ordinates

returns

  • An Array of Bio::Graphic::Primitive objects



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# File 'lib/geniact/graphics/glyph.rb', line 151

def self.directed(args) #:x, :y, :width :fill, :stroke :stroke_width, :style, :height
  args = {

      :height => 10,
      :fill_color => 'red',
      :stroke => "black",
      :stroke_width => 1,
      :style => "fill-opacity:1;"}.merge!(args)

  if args[:strand] == '-'
    args[:points] = "#{args[:x]},#{args[:y]} #{args[:x] + args[:width]},#{args[:y]} #{args[:x] + args[:width]},#{args[:y] + args[:height] } #{args[:x]},#{args[:y] + (args[:height])} #{args[:x] - (args[:height] * 0.2)},#{args[:y] + (args[:height]/2)}"
  else
    args[:points] = "#{args[:x]},#{args[:y]} #{args[:x] + args[:width] - (args[:height] * 0.2)},#{args[:y]} #{args[:x] + args[:width]},#{args[:y] + (args[:height]/2) } #{args[:x] + args[:width] - (args[:height] * 0.2)},#{args[:y] + args[:height]} #{args[:x]},#{args[:y] + args[:height]}"

  end
  [Geniact::Graphics::Primitive.new(:polygon, args)]
end

.down_triangle(args) ⇒ Object

A downward-pointing triangle glyph

args

  • :height = the height of the Glyph (default = 10)

  • :fill_color = the fill colour of the Glyph (default = ‘red’), can be any SVG colour eg rgb(256,0,0) or #FF0000, or one of the built in gradient types Bio::Graphics::Glyph#gradients

:red_white_h, :green_white_h, :blue_white_h, :yellow_white_h, :red_white_radial, :green_white_radial, :blue_white_radial, :yellow_white_radial

or a custom definition of a gradient {:type => :radial, :id => :custom, :cx => 5, :cy => 5, :r => 50, :fx => 50, :fy => 50,

:stops => [ {
     :offset => 0,
     :color => 'rgb(255,255,255)',
     :opacity => 0
     },  {
     :offset => 100,
     :color => 'rgb(0,127,200)',
     :opacity => 1
     }, ]

} #* :stroke = the outline colour of the Glyph (default = “black”), can be any SVG colour eg rgb(256,0,0) or #FF0000

  • :stroke_width = The width of the outline stroke (default = 1), can be any SVG colour eg rgb(256,0,0) or #FF0000

  • :style = an arbitrary SVG compliant style string eg “fill-opacity:0.4;”

  • :x = x coordinate of the feature in pixels, usually added by the Bio::Graphics::Page object

  • :y = y coordinate of the feature in pixels, usually added by the Bio::Graphics::Page object

returns

  • An Array of Bio::Graphic::Primitive objects



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# File 'lib/geniact/graphics/glyph.rb', line 200

def self.down_triangle(args) #:x, :y, :width :fill, :stroke :stroke_width, :style, :height
  args = {

      :height => 10,
      :fill_color => 'red',
      :stroke => "black",
      :stroke_width => 1,
      :style => "fill-opacity:1;"}.merge!(args)

  args[:points] = "#{args[:x]},#{args[:y]} #{args[:x] + args[:width]},#{args[:y]} #{ args[:x] + (args[:width]/2) },#{(args[:y] + args[:height]) }"
  [Geniact::Graphics::Primitive.new(:polygon, args)]
end

.generic(args) ⇒ Object

A generic glyph is a block of colour that displays no specific directional information attached.

args

  • :height = the height of the Glyph (default = 10)

  • :fill_color = the fill colour of the Glyph (default = ‘red’), can be any SVG colour eg rgb(256,0,0) or #FF0000, or one of the built in gradient types Bio::Graphics::Glyph#gradients

:red_white_h, :green_white_h, :blue_white_h, :yellow_white_h, :red_white_radial, :green_white_radial, :blue_white_radial, :yellow_white_radial

or a custom definition of a gradient {:type => :radial, :id => :custom, :cx => 5, :cy => 5, :r => 50, :fx => 50, :fy => 50,

:stops => [ {
     :offset => 0,
     :color => 'rgb(255,255,255)',
     :opacity => 0
     },  {
     :offset => 100,
     :color => 'rgb(0,127,200)',
     :opacity => 1
     }, ]

} #* :stroke = the outline colour of the Glyph (default = “black”), can be any SVG colour eg rgb(256,0,0) or #FF0000

  • :stroke_width = The width of the outline stroke (default = 1), can be any SVG colour eg rgb(256,0,0) or #FF0000

  • :x_round = x-axis radius of the ellipse used to round off the corners of the rectangle (default = 1)

  • :y_round = y-axis radius of the ellipse used to round off the corners of the rectangle (default = 1)

  • :style = an arbitrary SVG compliant style string eg “fill-opacity:0.4;”

  • :x = x coordinate of the feature in pixels, usually added by the Bio::Graphics::Page object

  • :y = y coordinate of the feature in pixels, usually added by the Bio::Graphics::Page object

returns

  • An Array of Bio::Graphic::Primitive objects



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# File 'lib/geniact/graphics/glyph.rb', line 59

def self.generic(args)
  args = {
      :height => 10,
      :fill_color => 'red',
      :stroke => "black",
      :stroke_width => 1,
      :x_round => 1,
      :y_round => 1,
      :style => "fill-opacity:0.4;"}.merge!(args)
  [Geniact::Graphics::Primitive.new(:rectangle, args)]
end

.gradient(gradient) ⇒ Object

Sets the the type (linear or radial) and colours for a pre-defined gradient

args

  • gradient = a pre-defined gradient type, one of

:red_white_h, :green_white_h, :blue_white_h, :yellow_white_h, :red_white_radial, :green_white_radial, :blue_white_radial, :yellow_white_radial 


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# File 'lib/geniact/graphics/glyph.rb', line 565

def self.gradient(gradient)
  type, color = case gradient
                  when :red_white_h
                    [:linear, "red"]
                  when :green_white_h
                    [:linear, "green"]
                  when :blue_white_h
                    [:linear, "blue"]
                  when :yellow_white_h
                    [:linear, "yellow"]
                  when :red_white_radial
                    [:radial, "red"]
                  when :green_white_radial
                    [:radial, "green"]
                  when :blue_white_radial
                    [:radial, "blue"]
                  when :yellow_white_radial
                    [:radial, "yellow"]
                end

  case type
    when :linear
      {:type => :linear,
       :id => gradient,
       :x1 => 0, :y1 => 0,
       :x2 => 0, :y2 => 100,
       :stops => [
           {
               :color => color,
               :offset => 0,
               :opacity => 1
           },
           {
               :color => "white",
               :offset => 100,
               :opacity => 1
           }
       ]
      }
    when :radial
      {
          :type => :radial,
          :id => gradient,
          :cx => 50, :cy => 50,
          :r => 50, :fx => 50, :fy => 50,
          :stops => [
              {:offset => 0,
               :color => "white",
               :opacity => 0
              },
              {
                  :offset => 100,
                  :color => color,
                  :opacity => 1
              }
          ]
      }
  end

end

.gradients ⇒ Object

The list of pre-defined gradients



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# File 'lib/geniact/graphics/glyph.rb', line 556

def self.gradients #needs to know which of its gradients are predefined
  [:red_white_h, :green_white_h, :blue_white_h, :yellow_white_h, :red_white_radial, :green_white_radial, :blue_white_radial, :yellow_white_radial]
end

.label(args) ⇒ Object

Creates a label Glyph to write text

args

  • :text = the text to write

  • :fill = the colour of the text (“black”)

  • :style = the style of writing (“font-family:monospace;”)

  • :x = the co-ordinates of the Glyph for the x-axis

  • :y = the co-ordinates of the Glyph for the y-axis



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# File 'lib/geniact/graphics/glyph.rb', line 546

def self.label(args)
  [Geniact::Graphics::Primitive.new(:text,
                                :text => args[:text],
                                :x => args[:x],
                                :y => args[:y],
                                :fill => "black",
                                :style => "font-family:monospace;")]
end

.scale(args) ⇒ Object

Glyph for the scale across the top of the rendered page

args

  • :start = the start of the scale, usually added by the Bio::Graphics::Page object

  • :stop = the end of the scale, usually added by the Bio::Graphics::Page object

  • :number_of_intervals = the number of tick-marks the scale will marked with

  • :page_width = the minimum width of the page, usually updated by the Bio::Graphics::Page object

returns

  • An Array of Bio::Graphic::Primitive objects (of type ‘line’, ‘rectangle’ and ‘text’)



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# File 'lib/geniact/graphics/glyph.rb', line 472

def self.scale(args)
  first_mark = args[:start]
  last_mark = args[:stop]
  page_height = args[:page_height]
  #(num.to_f / @nt_per_px_x.to_f)
  full_dist = last_mark - first_mark
  if args[:size_of_intervals]
    interval_width = args[:size_of_intervals]
    first_mark = first_mark.round(-3)
    last_mark = last_mark.round(-3)
    full_dist = last_mark - first_mark
  else
    interval_width = full_dist / (args[:number_of_intervals] - 1)
  end


  a = [Geniact::Graphics::Primitive.new(:line,
                                    :stroke => 'black',
                                    :stroke_width => 1,
                                    :x1 => 1, :x2 => args[:page_width], # * 1.1,
                                    :y1 => "20", :y2 => "20")]


  marks = (first_mark..last_mark).step(interval_width).to_a
  mini_marks = (first_mark..last_mark).step(interval_width/10).to_a

  px_per_nt = args[:page_width].to_f / full_dist.to_f
  marks.each do |mark|
    x = (mark.to_f - first_mark).to_f * px_per_nt
    a << Geniact::Graphics::Primitive.new(:rectangle,
                                      :x => x,
                                      :y => 15,
                                      :stroke => 'black',
                                      :stroke_width => 1,
                                      :width => 1,
                                      :height => 10)

    a << Geniact::Graphics::Primitive.new(:text,
                                      :x => x,
                                      :y => 15, :fill => 'black',
                                      :text => (mark/1000).to_s + 'k',
                                      :style => "font-family:Arial;font-style:italic")
  end

  mini_marks.each do |mark|
    x = (mark.to_f - first_mark).to_f * px_per_nt
    a << Geniact::Graphics::Primitive.new(:rectangle,
                                      :x => x,
                                      :y => 20,
                                      :stroke => 'black',
                                      :stroke_width => 1,
                                      :width => 1,
                                      :height => 5)

    a << Geniact::Graphics::Primitive.new(:rectangle,
                                      :x => x,
                                      :y => 25,
                                      :stroke => '#E8FFFF',
                                      :stroke_width => 1,
                                      :width => 1,
                                      :height => page_height)
    #TODO update height to be dynamic, also add turn on minimarks function
  end
  return a
end

.span(args) ⇒ Object

A line (span) glyph

args

  • :height = the height of the Glyph (default = 10)

  • :fill_color = the fill colour of the Glyph (default = ‘red’), can be any SVG colour eg rgb(256,0,0) or #FF0000, or one of the built in gradient types Bio::Graphics::Glyph#gradients

:red_white_h, :green_white_h, :blue_white_h, :yellow_white_h, :red_white_radial, :green_white_radial, :blue_white_radial, :yellow_white_radial

or a custom definition of a gradient {:type => :radial, :id => :custom, :cx => 5, :cy => 5, :r => 50, :fx => 50, :fy => 50,

:stops => [ {
     :offset => 0,
     :color => 'rgb(255,255,255)',
     :opacity => 0
     },  {
     :offset => 100,
     :color => 'rgb(0,127,200)',
     :opacity => 1
     }, ]

}

  • :stroke = the outline colour of the Glyph (default = “black”), can be any SVG colour eg rgb(256,0,0) or #FF0000

  • :stroke_width = The width of the outline stroke (default = 1)

  • :style = an arbitrary SVG compliant style string eg “fill-opacity:0.4;”

  • :x = x coordinate of the feature in pixels, usually added by the Bio::Graphics::Page object

  • :y = y coordinate of the feature in pixels, usually added by the Bio::Graphics::Page object

returns

  • An Array of Bio::Graphic::Primitive objects



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# File 'lib/geniact/graphics/glyph.rb', line 289

def self.span(args)
  args = {
      :height => 10,
      :fill_color => 'red',
      :stroke => "black",
      :stroke_width => 1,
      :style => "fill-opacity:1;"
  }.merge!(args)
  args[:x1] = args[:x]
  args[:x2] = args[:x] + args[:width]
  args[:y1] = args[:y]
  args[:y2] = args[:y]
  [Geniact::Graphics::Primitive.new(:line, args)]
end

.transcript(args) ⇒ Object

Creates a transcript glyph, which is a composite glyph containing generic glyphs for the exons/utrs and a directed glyph at the end. The glyphs are joined by lines.

args

  • :height = the height of the Glyph (default = 10)

  • :utr_fill_color = the fill colour of the utr part of the glyph (default = ‘black’), can be any SVG colour eg rgb(256,0,0) or #FF0000, or one of the built in gradient types Bio::Graphics::Glyph#gradients

:red_white_h, :green_white_h, :blue_white_h, :yellow_white_h, :red_white_radial, :green_white_radial, :blue_white_radial, :yellow_white_radial

or a custom definition of a gradient {:type => :radial, :id => :custom, :cx => 5, :cy => 5, :r => 50, :fx => 50, :fy => 50,

:stops => [ {
     :offset => 0,
     :color => 'rgb(255,255,255)',
     :opacity => 0
     },  {
     :offset => 100,
     :color => 'rgb(0,127,200)',
     :opacity => 1
     }, ]

}

  • :utr_stroke = the outline colour of the utr part of the glyph (default = “black”), can be any SVG colour eg rgb(256,0,0) or #FF0000

  • :utr_stroke_width = The width of the outline stroke for the utr part of the glyph (default = 1)

  • :exon_fill_color = the fill colour of the utr part of the glyph (default = ‘red’), can be any SVG colour eg rgb(256,0,0) or #FF0000, or one of the built in gradient types Bio::Graphics::Glyph#gradients or a custom definition of a gradient

:red_white_h, :green_white_h, :blue_white_h, :yellow_white_h, :red_white_radial, :green_white_radial, :blue_white_radial, :yellow_white_radial

or a custom definition of a gradient {:type => :radial, :id => :custom, :cx => 5, :cy => 5, :r => 50, :fx => 50, :fy => 50,

:stops => [ {
     :offset => 0,
     :color => 'rgb(255,255,255)',
     :opacity => 0
     },  {
     :offset => 100,
     :color => 'rgb(0,127,200)',
     :opacity => 1
     }, ]

}

  • :exon_stroke = the outline colour of the exon part of the glyph (default = “black”) can be any SVG colour eg rgb(256,0,0) or #FF0000

  • :exon_stroke_width = The width of the outline stroke for the exon part of the glyph (default = 1)

  • :line_color = the colour for the line part that joins the blocks (default = ‘black’) can be any SVG colour eg rgb(256,0,0) or #FF0000

  • :line_width = the width ffor the line part that joins the blocks (default = 1)

  • :exon_style = an arbitrary SVG compliant style string eg “fill-opacity:0.4;”

  • :utr_style = an arbitrary SVG compliant style string eg “fill-opacity:0.4;”

  • :line_style = an arbitrary SVG compliant style string eg “fill-opacity:0.4;”

  • :block_gaps = gaps between the rendered blocks - calculated internally by Bio::Graphics::Page object

  • :gap_marker = style of the line between blocks - either angled or straight

  • :x = x coordinate of the feature in pixels, usually added by the Bio::Graphics::Page object

  • :y = y coordinate of the feature in pixels, usually added by the Bio::Graphics::Page object

returns

  • An Array of Bio::Graphic::Primitive objects



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# File 'lib/geniact/graphics/glyph.rb', line 366

def self.transcript(args)
  args = {
      :height => 10,
      :utr_fill_color => 'black',
      :utr_stroke => "black",
      :utr_stroke_width => 1,
      :exon_fill_color => 'red',
      :exon_stroke => "black",
      :exon_stroke_width => 1,
      :line_color => 'black',
      :line_width => 1,
      :exon_style => "fill-opacity:0.4;",
      :utr_style => "",
      :line_style => "",
      :block_gaps => "",
      :gap_marker => ""
  }.merge!(args)

  composite = []

  if not args[:utrs].empty? ##draw the utr as terminal element...##terminal utr is the one with the point on...
    x, width = args[:strand] == '-' ? args[:utrs].shift : args[:utrs].pop
    composite += Glyph.directed(:x => x,
                                :y => args[:y],
                                :width => width,
                                :strand => args[:strand],
                                :height => args[:height],
                                :fill_color => args[:utr_fill_color],
                                :stroke => args[:utr_stroke],
                                :stroke_width => args[:utr_stroke_width],
                                :style => args[:utr_style])
    ##draw the other(s!)
    args[:utrs].each do |utr|
      composite << Geniact::Graphics::Primitive.new(:rectangle, {
          :x => utr.first,
          :width => utr.last,
          :y => args[:y],
          :height => args[:height],
          :fill_color => args[:utr_fill_color],
          :stroke => args[:utr_stroke],
          :stroke_width => args[:utr_stroke_width],
          :style => args[:utr_style]})
    end
  else ## draw the terminal exon as terminal element
    points = nil
    x, width = args[:strand] == '-' ? args[:exons].shift : args[:exons].pop
    composite += Glyph.directed(:x => x,
                                :y => args[:y],
                                :width => width,
                                :strand => args[:strand],
                                :height => args[:height],
                                :fill_color => args[:exon_fill_color],
                                :stroke => args[:exon_stroke],
                                :stroke_width => args[:exon_stroke_width],
                                :style => args[:exon_style])
  end
  #draw any remaining exons
  args[:exons].each do |exon|
    composite << Geniact::Graphics::Primitive.new(:rectangle, {
        :x => exon[0],
        :width => exon[1],
        :y => args[:y],
        :height => args[:height],
        :fill_color => args[:exon_fill_color],
        :stroke => args[:exon_stroke],
        :stroke_width => args[:exon_stroke_width],
        :style => args[:exon_style]})
  end
  if not args[:block_gaps].empty?
    if args[:gap_marker] == "angled"
      args[:block_gaps].each do |gap|
        points = "#{gap.first},#{args[:y] + (args[:height]/2) } #{gap.first + (gap.last/2)},#{args[:y]} #{gap.first + gap.last},#{args[:y] + (args[:height]/2)}"
        composite << Geniact::Graphics::Primitive.new(:polyline, {
            :points => points,
            :stroke => args[:line_color],
            :stroke_width => args[:line_width],
            :fill => "none",
            :line_style => args[:line_style]})
      end
    else
      #add line
      composite << Geniact::Graphics::Primitive.new(:line, {
          :x1 => args[:x],
          :x2 => "#{args[:x] + args[:width]}",
          :y1 => args[:y] + (args[:height]/2),
          :y2 => args[:y] + (args[:height]/2),
          :stroke => args[:line_color],
          :stroke_width => args[:line_width],
          :line_style => args[:line_style]})

    end
  end
  composite
end

.up_triangle(args) ⇒ Object

An upward-pointing triangle glyph

args

  • :height = the height of the Glyph (default = 10)

  • :fill_color = the fill colour of the Glyph (default = ‘red’), can be any SVG colour eg rgb(256,0,0) or #FF0000, or one of the built in gradient types Bio::Graphics::Glyph#gradients

:red_white_h, :green_white_h, :blue_white_h, :yellow_white_h, :red_white_radial, :green_white_radial, :blue_white_radial, :yellow_white_radial

or a custom definition of a gradient {:type => :radial, :id => :custom, :cx => 5, :cy => 5, :r => 50, :fx => 50, :fy => 50,

:stops => [ {
     :offset => 0,
     :color => 'rgb(255,255,255)',
     :opacity => 0
     },  {
     :offset => 100,
     :color => 'rgb(0,127,200)',
     :opacity => 1
     }, ]

}

  • :stroke = the outline colour of the Glyph (default = “black”), can be any SVG colour eg rgb(256,0,0) or #FF0000

  • :stroke_width = The width of the outline stroke (default = 1), can be any SVG colour eg rgb(256,0,0) or #FF0000

  • :style = an arbitrary SVG compliant style string eg “fill-opacity:0.4;”

  • :x = x coordinate of the feature in pixels, usually added by the Bio::Graphics::Page object

  • :y = y coordinate of the feature in pixels, usually added by the Bio::Graphics::Page object

returns

  • An Array of Bio::Graphic::Primitive objects



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# File 'lib/geniact/graphics/glyph.rb', line 245

def self.up_triangle(args) #:x, :y, :width :fill, :stroke :stroke_width, :style, :height
  args = {
      :height => 10,
      :fill_color => 'red',
      :stroke => "black",
      :stroke_width => 1,
      :style => "fill-opacity:1;"}.merge!(args)
  args[:points] = "#{args[:x]},#{args[:y] + args[:height]} #{args[:x] + args[:width]},#{args[:y] + args[:height]} #{ args[:x] + (args[:width]/2) },#{args[:y] }"
  [Geniact::Graphics::Primitive.new(:polygon, args)]
end