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require File.dirname(__FILE__) + '/base'
require File.dirname(__FILE__) + '/bar_conversion'
class Gruff::Bar < Gruff::Base
# Spacing factor applied between bars
attr_accessor :bar_spacing
def initialize(*args)
super
@spacing_factor = 0.9
end
def draw
# Labels will be centered over the left of the bar if
# there are more labels than columns. This is basically the same
# as where it would be for a line graph.
@center_labels_over_point = (@labels.keys.length > @column_count ? true : false)
super
return unless @has_data
draw_bars
end
# Can be used to adjust the spaces between the bars.
# Accepts values between 0.00 and 1.00 where 0.00 means no spacing at all
# and 1 means that each bars' width is nearly 0 (so each bar is a simple
# line with no x dimension).
#
# Default value is 0.9.
def spacing_factor=(space_percent)
raise ArgumentError, 'spacing_factor must be between 0.00 and 1.00' unless (space_percent >= 0 and space_percent <= 1)
@spacing_factor = (1 - space_percent)
end
protected
def draw_bars
# Setup spacing.
#
# Columns sit side-by-side.
@bar_spacing ||= @spacing_factor # space between the bars
@bar_width = @graph_width / (@column_count * @data.length).to_f
padding = (@bar_width * (1 - @bar_spacing)) / 2
@d = @d.stroke_opacity 0.0
# Setup the BarConversion Object
conversion = Gruff::BarConversion.new()
conversion.graph_height = @graph_height
conversion.graph_top = @graph_top
# Set up the right mode [1,2,3] see BarConversion for further explanation
if @minimum_value >= 0 then
# all bars go from zero to positiv
conversion.mode = 1
else
# all bars go from 0 to negativ
if @maximum_value <= 0 then
conversion.mode = 2
else
# bars either go from zero to negativ or to positiv
conversion.mode = 3
conversion.spread = @spread
conversion.minimum_value = @minimum_value
conversion.zero = -@minimum_value/@spread
end
end
# iterate over all normalised data
@norm_data.each_with_index do |data_row, row_index|
data_row[DATA_VALUES_INDEX].each_with_index do |data_point, point_index|
# Use incremented x and scaled y
# x
left_x = @graph_left + (@bar_width * (row_index + point_index + ((@data.length - 1) * point_index))) + padding
right_x = left_x + @bar_width * @bar_spacing
# y
conv = []
conversion.get_left_y_right_y_scaled( data_point, conv )
# create new bar
@d = @d.fill data_row[DATA_COLOR_INDEX]
@d = @d.rectangle(left_x, conv[0], right_x, conv[1])
# Calculate center based on bar_width and current row
label_center = @graph_left +
(@data.length * @bar_width * point_index) +
(@data.length * @bar_width / 2.0)
# Subtract half a bar width to center left if requested
draw_label(label_center - (@center_labels_over_point ? @bar_width / 2.0 : 0.0), point_index)
if @show_labels_for_bar_values
val = (@label_formatting || '%.2f') % @norm_data[row_index][3][point_index]
draw_value_label(left_x + (right_x - left_x)/2, conv[0]-30, val.commify, true)
end
end
end
# Draw the last label if requested
draw_label(@graph_right, @column_count) if @center_labels_over_point
@d.draw(@base_image)
end
end
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