class Gruff::SideBar

Graph with individual horizontal bars instead of vertical bars.

Attributes

bar_spacing[RW]

Spacing factor applied between bars

Public Instance Methods

draw() click to toggle source
Calls superclass method Gruff::Base#draw
# File lib/gruff/side_bar.rb, line 11
def draw
  @has_left_labels = true
  super

  return unless @has_data
  draw_bars
end

Protected Instance Methods

draw_bars() click to toggle source
# File lib/gruff/side_bar.rb, line 21
def draw_bars
  # Setup spacing.
  #
  @bar_spacing ||= 0.9

  @bars_width = @graph_height / @column_count.to_f
  @bar_width = @bars_width / @norm_data.size
  @d = @d.stroke_opacity 0.0
  height = Array.new(@column_count, 0)
  length = Array.new(@column_count, @graph_left)
  padding = (@bar_width * (1 - @bar_spacing)) / 2

  # if we're a side stacked bar then we don't need to draw ourself at all
  # because sometimes (due to different heights/min/max) you can actually
  # see both graphs and it looks like crap
  return if self.is_a?(Gruff::SideStackedBar)

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

    data_row[DATA_VALUES_INDEX].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])
      temp2 = @graph_left + @graph_width - height[point_index]
      difference = temp2 - temp1

      left_x = length[point_index] - 1
      left_y = @graph_top + (@bars_width * point_index) + (@bar_width * row_index) + padding
      right_x = left_x + difference
      right_y = left_y + @bar_width * @bar_spacing

      height[point_index] += (data_point * @graph_width)

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

      # Calculate center based on bar_width and current row

      if @use_data_label
        label_center = @graph_top + (@bar_width * (row_index+point_index) + @bar_width / 2)
        draw_label(label_center, row_index, @norm_data[row_index][DATA_LABEL_INDEX])
      else
        label_center = @graph_top + (@bars_width * point_index + @bars_width / 2)
        draw_label(label_center, point_index)
      end
      if @show_labels_for_bar_values
        val = (@label_formatting || '%.2f') % @norm_data[row_index][3][point_index]
        draw_value_label(right_x+40, (@graph_top + (((row_index+point_index+1) * @bar_width) - (@bar_width / 2)))-12, val.commify, true)
      end
    end

  end

  @d.draw(@base_image)
end
draw_label(y_offset, index, label=nil) click to toggle source

Draw on the Y axis instead of the X

# File lib/gruff/side_bar.rb, line 121
def draw_label(y_offset, index, label=nil)
  if !@labels[index].nil? && @labels_seen[index].nil?
    lbl = (@use_data_label) ? label : @labels[index]
    @d.fill = @font_color
    @d.font = @font if @font
    @d.stroke = 'transparent'
    @d.font_weight = NormalWeight
    @d.pointsize = scale_fontsize(@marker_font_size)
    @d.gravity = EastGravity
    @d = @d.annotate_scaled(@base_image,
                            1, 1,
                            -@graph_left + LABEL_MARGIN * 2.0, y_offset,
                            lbl, @scale)
    @labels_seen[index] = 1
  end
end
draw_line_markers() click to toggle source

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

# File lib/gruff/side_bar.rb, line 80
def draw_line_markers

  return if @hide_line_markers

  @d = @d.stroke_antialias false

  # Draw horizontal line markers and annotate with numbers
  @d = @d.stroke(@marker_color)
  @d = @d.stroke_width 1
  number_of_lines = @marker_count || 5
  number_of_lines = 1 if number_of_lines == 0

  # TODO Round maximum marker value to a round number like 100, 0.1, 0.5, etc.
  increment = significant(@spread.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 + @minimum_value

    unless @hide_line_numbers
      @d.fill = @font_color
      @d.font = @font if @font
      @d.stroke = 'transparent'
      @d.pointsize = scale_fontsize(@marker_font_size)
      @d.gravity = CenterGravity
      # TODO Center text over line
      @d = @d.annotate_scaled(@base_image,
                              0, 0, # Width of box to draw text in
                              x, @graph_bottom + (LABEL_MARGIN * 2.0), # Coordinates of text
                              marker_label.to_s, @scale)
    end # unless
    @d = @d.stroke_antialias true
  end
end