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require File.dirname(__FILE__) + '/base'
require File.dirname(__FILE__) + '/side_bar'
require File.dirname(__FILE__) + '/stacked_mixin'
##
# New gruff graph type added to enable sideways stacking bar charts
# (basically looks like a x/y flip of a standard stacking bar chart)
#
# alun.eyre@googlemail.com
class Gruff::SideStackedBar < Gruff::SideBar
include StackedMixin
# Spacing factor applied between bars
attr_accessor :bar_spacing
def draw
@has_left_labels = true
get_maximum_by_stack
super
end
protected
def draw_bars
# Setup spacing.
#
# Columns sit stacked.
@bar_spacing ||= 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)
padding = (@bar_width * (1 - @bar_spacing)) / 2
if @show_labels_for_bar_values
label_values = Array.new
0.upto(@column_count-1) {|i| label_values[i] = {:value => 0, :right_x => 0}}
end
@norm_data.each_with_index do |data_row, row_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]) + 1
temp2 = @graph_left + @graph_width - height[point_index] - 1
difference = temp2 - temp1
@d = @d.fill data_row[DATA_COLOR_INDEX]
left_x = length[point_index] #+ 1
left_y = @graph_top + (@bar_width * point_index) + padding
right_x = left_x + difference
right_y = left_y + @bar_width * @bar_spacing
length[point_index] += difference
height[point_index] += (data_point * @graph_width - 2)
if @show_labels_for_bar_values
label_values[point_index][:value] += @norm_data[row_index][3][point_index]
label_values[point_index][:right_x] = right_x
end
# if a data point is 0 it can result in weird really thing lines
# that shouldn't even be there being drawn on top of the existing
# bar - this is bad
if data_point != 0
@d = @d.rectangle(left_x, left_y, right_x, right_y)
# Calculate center based on bar_width and current row
end
# we still need to draw the labels
# Calculate center based on bar_width and current row
label_center = @graph_top + (@bar_width * point_index) + (@bar_width * @bar_spacing / 2.0)
draw_label(label_center, point_index)
end
end
if @show_labels_for_bar_values
label_values.each_with_index do |data, i|
val = (@label_formatting || "%.2f") % data[:value]
draw_value_label(data[:right_x]+40, (@graph_top + (((i+1) * @bar_width) - (@bar_width / 2)))-12, val.commify, true)
end
end
@d.draw(@base_image)
end
def larger_than_max?(data_point, index=0)
max(data_point, index) > @maximum_value
end
def max(data_point, index)
@data.inject(0) {|sum, item| sum + item[DATA_VALUES_INDEX][index]}
end
end
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