Class: Gruff::SideStackedBar

Inherits:
Base
  • Object
show all
Defined in:
lib/gruff/side_stacked_bar.rb

Constant Summary

Constants inherited from Base

Base::DATA_COLOR_INDEX, Base::DATA_LABEL_INDEX, Base::DATA_VALUES_INDEX, Base::DEBUG, Base::LEGEND_MARGIN, Base::TOP_MARGIN

Constants included from Magick

Magick::BoldWeight, Magick::CenterGravity, Magick::EastGravity, Magick::NormalWeight, Magick::NorthEastGravity, Magick::NorthGravity, Magick::NorthWestGravity, Magick::SouthEastGravity, Magick::SouthGravity, Magick::SouthWestGravity, Magick::WestGravity

Instance Attribute Summary

Attributes inherited from Base

#additional_line_values, #colors, #font, #hide_legend, #hide_line_markers, #hide_title, #labels, #legend_font_size, #marker_color, #marker_count, #marker_font_size, #maximum_value, #minimum_value, #no_data_message, #stacked, #title, #title_font_size, #x_axis_label, #y_axis_increment, #y_axis_label

Instance Method Summary collapse

Methods inherited from Base

#add_color, #data, #initialize, #replace_colors, #theme=, #theme_37signals, #theme_keynote, #theme_odeo, #theme_rails_keynote, #to_blob, #write

Methods included from Deprecated

#graph_height, #graph_left, #graph_top, #graph_width, #scale_measurements, #total_height

Constructor Details

This class inherits a constructor from Gruff::Base

Instance Method Details

#draw ⇒ Object 



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# File 'lib/gruff/side_stacked_bar.rb', line 61

def draw
  get_maximum_by_stack
  super

  return unless @has_data

  # Setup spacing.
  #
  # Columns sit stacked.
  spacing_factor = 0.9

  @bar_width = @graph_height / @column_count.to_f
  @d = @d.stroke_opacity 0.0
  height = Array.new(@column_count, 0)
  length = Array.new(@column_count, @graph_left)

  @norm_data.each_with_index do |data_row, row_index|
    @d = @d.fill data_row[DATA_COLOR_INDEX]

    data_row[1].each_with_index do |data_point, point_index|

  	  ## using the original calcs from the stacked bar chart to get the difference between
  	  ## part of the bart chart we wish to stack.
  	  temp1 = @graph_left + (@graph_width -
                                  data_point * @graph_width - 
                                  height[point_index]) + 1
  	  temp2 = @graph_left + @graph_width - height[point_index] - 1
  	  difference = temp2 - temp1

  	  left_x = length[point_index] #+ 1
            left_y = @graph_top + (@bar_width * point_index)
  	  right_x = left_x + difference
            right_y = left_y + @bar_width * spacing_factor
  	  length[point_index] += difference
      height[point_index] += (data_point * @graph_width - 2)

      @d = @d.rectangle(left_x, left_y, right_x, right_y)

      # Calculate center based on bar_width and current row
      label_center = @graph_top + (@bar_width * point_index) + (@bar_width * spacing_factor / 2.0)
      draw_label(label_center, point_index)
    end

  end

  @d.draw(@base_image)    
end

#draw_label(y_offset, index) ⇒ Object

instead of base class version, modified to enable us to draw on the Y axis instead of X



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# File 'lib/gruff/side_stacked_bar.rb', line 45

def draw_label(y_offset, index)
  if !@labels[index].nil? && @labels_seen[index].nil?
    @d.fill = @marker_color
    @d.font = @font if @font
    @d.stroke = 'transparent'
    @d.font_weight = NormalWeight
    @d.pointsize = scale_fontsize(@marker_font_size)
    @d.gravity = CenterGravity
    @d = @d.annotate_scaled(@base_image,
                            1, 1,
                            @graph_left / 2, y_offset,
                            @labels[index], @scale)
    @labels_seen[index] = 1
  end
end

#draw_line_markers ⇒ Object

instead of base class version, draws vertical background lines and label



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# File 'lib/gruff/side_stacked_bar.rb', line 11

def draw_line_markers

  return if @hide_line_markers

  # Draw horizontal line markers and annotate with numbers
  @d = @d.stroke(@marker_color)
  @d = @d.stroke_width 1
  number_of_lines = 5

  # TODO Round maximum marker value to a round number like 100, 0.1, 0.5, etc.
  increment = significant(@maximum_value.to_f / number_of_lines)
  (0..number_of_lines).each do |index|

    line_diff = (@graph_right - @graph_left) / number_of_lines
    x = @graph_right - (line_diff * index) - 1
    @d = @d.line(x, @graph_bottom, x, @graph_top)

    diff = index - number_of_lines
    marker_label = diff.abs * increment

    @d.fill = @marker_color
    @d.font = @font if @font
    @d.stroke = 'transparent'
    @d.pointsize = scale_fontsize(@marker_font_size)
#        @d.gravity = NorthGravity
    @d = @d.annotate_scaled( @base_image, 
                      100, 20,
                      x - (@marker_font_size/1.5), @graph_bottom + 40, 
                      marker_label.to_s, @scale)

  end
end