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require File.dirname(__FILE__) + '/base'
##
# Graph with individual horizontal bars instead of vertical bars.
class Gruff::SideBar < Gruff::Base
# Spacing factor applied between bars
attr_accessor :bar_spacing
def draw
@has_left_labels = true
super
return unless @has_data
draw_bars
end
protected
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
# Instead of base class version, draws vertical background lines and label
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
##
# Draw on the Y axis instead of the X
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
end
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