Class: SVGCharts::Bar

Inherits:
Object
  • Object
show all
Includes:
SVGElements
Defined in:
lib/charts/bar.rb

Instance Method Summary collapse

Methods included from SVGElements

#circle, #line, #line_dashed, #rect, #text, #text_with_rotation

Constructor Details

#initialize(options) ⇒ Bar

Returns a new instance of Bar.



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# File 'lib/charts/bar.rb', line 5

def initialize(options)
  validation options, [:width, :height, :y_retreat, :x_retreat]

  @width = options[:width]
  @height = options[:height]

  @y_retreat = options[:y_retreat]
  @x_retreat = options[:x_retreat]
end

Instance Method Details

#draw(options) ⇒ Object 



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# File 'lib/charts/bar.rb', line 58

def draw(options)
  validation options, [:scale, :data, :data_color, :show_scale]

  calculate_coordinates options[:data]

  elements = ""

  @coordinates.each_with_index do |coordinate, i|
    elements << rect({
      :x => coordinate[0] * 1.025,
      :y => coordinate[2],
      :width => coordinate[1] - coordinate[0],
      :height => @height - coordinate[2],
      :color => options[:data_color]
    })

    elements << text({
      :x => (((coordinate[1] - coordinate[0]) - options[:scale][i].length)/2) + (coordinate[0] * 1.025) - 10,
      :y => coordinate[2] - 10,
      :color => options[:data_color],
      :font_size => 11,
      :font_weight => "bold",
      :value => options[:data][i]
    })

    if options[:show_scale]
      elements << text({
        :x => (((coordinate[1] - coordinate[0]) - options[:scale][i].length)/2) + (coordinate[0] * 1.025) - 10,
        :y => @height + 12,
        :color => "#999",
        :font_size => 10,
        :font_weight => "normal",
        :value => options[:scale][i]
      })
    end
  end

  elements
end

#scale(options) ⇒ Object 



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# File 'lib/charts/bar.rb', line 15

def scale(options)
  validation options, [:y_label, :x_label]

  scale = line({
    :x1 => @x_retreat - 8,
    :x2 => @x_retreat - 8,
    :y1 => @y_retreat - 2,
    :y2 => @height + 13,
    :line_width => 2,
    :color => "#aaa"
  })

  scale << line({
    :x1 => 0,
    :x2 => @width,
    :y1 => @height,
    :y2 => @height,
    :line_width => 2,
    :color => "#aaa"
  })

  scale << text({
    :x => @width/2 - (options[:y_label].length * 2),
    :y => @height + 30,
    :color => "#bbb",
    :font_size => 11,
    :font_weight => "bold",
    :value => options[:x_label]
  })

  scale << text_with_rotation({
    :x => @height/2 - (options[:y_label].length * 2),
    :y => 8,
    :color => "#bbb",
    :font_size => 11,
    :font_weight => "bold",
    :rotate => "270 #{@height/2} #{@height/2}",
    :value => options[:y_label]
  })

  scale
end