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require File.dirname(__FILE__) + '/base'
require 'gruff/themes'
# http://en.wikipedia.org/wiki/Bullet_graph
class Gruff::Bullet < Gruff::Base
def initialize(target_width="400x40")
if not Numeric === target_width
geometric_width, geometric_height = target_width.split('x')
@columns = geometric_width.to_f
@rows = geometric_height.to_f
else
@columns = target_width.to_f
@rows = target_width.to_f / 5.0
end
initialize_ivars
reset_themes
self.theme = Gruff::Themes::GREYSCALE
@title_font_size = 20
end
def data(value, maximum_value, options={})
@value = value.to_f
@maximum_value = maximum_value.to_f
@options = options
@options.map { |k, v| @options[k] = v.to_f if v === Numeric }
end
# def setup_drawing
# # Maybe should be done in one of the following functions for more granularity.
# unless @has_data
# draw_no_data()
# return
# end
#
# normalize()
# setup_graph_measurements()
# sort_norm_data() if @sort # Sort norm_data with avg largest values set first (for display)
#
# draw_legend()
# draw_line_markers()
# draw_axis_labels()
# draw_title
# end
def draw
# TODO Left label
# TODO Bottom labels and markers
# @graph_bottom
# Calculations are off 800x???
@colors.reverse!
draw_title
@margin = 30.0
@thickness = @raw_rows / 6.0
@right_margin = @margin
@graph_left = @title_width * 1.3 rescue @margin # HACK Need to calculate real width
@graph_width = @raw_columns - @graph_left - @right_margin
@graph_height = @thickness * 3.0
# Background
@d = @d.fill @colors[0]
@d = @d.rectangle(@graph_left, 0, @graph_left + @graph_width, @graph_height)
[:high, :low].each_with_index do |indicator, index|
next unless @options.has_key?(indicator)
@d = @d.fill @colors[index + 1]
indicator_width_x = @graph_left + @graph_width * (@options[indicator] / @maximum_value)
@d = @d.rectangle(@graph_left, 0, indicator_width_x, @graph_height)
end
if @options.has_key?(:target)
@d = @d.fill @font_color
target_x = @graph_left + @graph_width * (@options[:target] / @maximum_value)
half_thickness = @thickness / 2.0
@d = @d.rectangle(target_x, half_thickness, target_x + half_thickness, @thickness * 2 + half_thickness)
end
# Value
@d = @d.fill @font_color
@d = @d.rectangle(@graph_left, @thickness, @graph_left + @graph_width * (@value / @maximum_value), @thickness * 2)
@d.draw(@base_image)
end
def draw_title
return unless @title
@font_height = calculate_caps_height(scale_fontsize(@title_font_size))
@title_width = calculate_width(@title_font_size, @title)
@d.fill = @font_color
@d.font = @font if @font
@d.stroke('transparent')
@d.font_weight = NormalWeight
@d.pointsize = scale_fontsize(@title_font_size)
@d.gravity = NorthWestGravity
@d = @d.annotate_scaled(*[
@base_image,
1.0, 1.0,
@font_height/2, @font_height/2,
@title,
@scale
])
end
end
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