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require File.dirname(__FILE__) + '/base'
require File.dirname(__FILE__) + '/stacked_mixin'
class Gruff::StackedBar < Gruff::Base
include StackedMixin
# Spacing factor applied between bars
attr_accessor :bar_spacing
# Number of pixels between bar segments
attr_accessor :segment_spacing
# Draws a bar graph, but multiple sets are stacked on top of each other.
def draw
get_maximum_by_stack
super
return unless @has_data
# Setup spacing.
#
# Columns sit stacked.
@bar_spacing ||= 0.9
@segment_spacing ||= 1
@bar_width = @graph_width / @column_count.to_f
padding = (@bar_width * (1 - @bar_spacing)) / 2
@d = @d.stroke_opacity 0.0
height = Array.new(@column_count, 0)
@norm_data.each_with_index do |data_row, row_index|
data_row[DATA_VALUES_INDEX].each_with_index do |data_point, point_index|
@d = @d.fill data_row[DATA_COLOR_INDEX]
# Calculate center based on bar_width and current row
label_center = @graph_left + (@bar_width * point_index) + (@bar_width * @bar_spacing / 2.0)
draw_label(label_center, point_index)
next if (data_point == 0)
# Use incremented x and scaled y
left_x = @graph_left + (@bar_width * point_index) + padding
left_y = @graph_top + (@graph_height -
data_point * @graph_height -
height[point_index]) + @segment_spacing
right_x = left_x + @bar_width * @bar_spacing
right_y = @graph_top + @graph_height - height[point_index] - @segment_spacing
# update the total height of the current stacked bar
height[point_index] += (data_point * @graph_height )
@d = @d.rectangle(left_x, left_y, right_x, right_y)
end
end
@d.draw(@base_image)
end
end
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