149 lines
4.1 KiB
Ruby
149 lines
4.1 KiB
Ruby
require 'rexml/document'
|
|
require 'SVG/Graph/Graph'
|
|
require 'SVG/Graph/BarBase'
|
|
|
|
module SVG
|
|
module Graph
|
|
# === Create presentation quality SVG bar graphs easily
|
|
#
|
|
# = Synopsis
|
|
#
|
|
# require 'SVG/Graph/Bar'
|
|
#
|
|
# fields = %w(Jan Feb Mar);
|
|
# data_sales_02 = [12, 45, 21]
|
|
#
|
|
# graph = SVG::Graph::Bar.new(
|
|
# :height => 500,
|
|
# :width => 300,
|
|
# :fields => fields
|
|
# )
|
|
#
|
|
# graph.add_data(
|
|
# :data => data_sales_02,
|
|
# :title => 'Sales 2002'
|
|
# )
|
|
#
|
|
# print "Content-type: image/svg+xml\r\n\r\n"
|
|
# print graph.burn
|
|
#
|
|
# = Description
|
|
#
|
|
# This object aims to allow you to easily create high quality
|
|
# SVG[http://www.w3c.org/tr/svg bar graphs. You can either use the default
|
|
# style sheet or supply your own. Either way there are many options which
|
|
# can be configured to give you control over how the graph is generated -
|
|
# with or without a key, data elements at each point, title, subtitle etc.
|
|
#
|
|
# = Notes
|
|
#
|
|
# The default stylesheet handles upto 12 data sets, if you
|
|
# use more you must create your own stylesheet and add the
|
|
# additional settings for the extra data sets. You will know
|
|
# if you go over 12 data sets as they will have no style and
|
|
# be in black.
|
|
#
|
|
# = Examples
|
|
#
|
|
# * http://germane-software.com/repositories/public/SVG/test/test.rb
|
|
#
|
|
# = See also
|
|
#
|
|
# * SVG::Graph::Graph
|
|
# * SVG::Graph::BarHorizontal
|
|
# * SVG::Graph::Line
|
|
# * SVG::Graph::Pie
|
|
# * SVG::Graph::Plot
|
|
# * SVG::Graph::TimeSeries
|
|
class Bar < BarBase
|
|
include REXML
|
|
|
|
# See Graph::initialize and BarBase::set_defaults
|
|
def set_defaults
|
|
super
|
|
self.top_align = self.top_font = 1
|
|
end
|
|
|
|
protected
|
|
|
|
def get_x_labels
|
|
@config[:fields]
|
|
end
|
|
|
|
def get_y_labels
|
|
maxvalue = max_value
|
|
minvalue = min_value
|
|
range = maxvalue - minvalue
|
|
|
|
top_pad = range == 0 ? 10 : range / 20.0
|
|
scale_range = (maxvalue + top_pad) - minvalue
|
|
|
|
scale_division = scale_divisions || (scale_range / 10.0)
|
|
|
|
if scale_integers
|
|
scale_division = scale_division < 1 ? 1 : scale_division.round
|
|
end
|
|
|
|
rv = []
|
|
maxvalue = maxvalue%scale_division == 0 ?
|
|
maxvalue : maxvalue + scale_division
|
|
minvalue.step( maxvalue, scale_division ) {|v| rv << v}
|
|
return rv
|
|
end
|
|
|
|
def x_label_offset( width )
|
|
width / 2.0
|
|
end
|
|
|
|
def draw_data
|
|
minvalue = min_value
|
|
fieldwidth = field_width
|
|
|
|
unit_size = (@graph_height.to_f - font_size*2*top_font) /
|
|
(get_y_labels.max - get_y_labels.min)
|
|
bargap = bar_gap ? (fieldwidth < 10 ? fieldwidth / 2 : 10) : 0
|
|
|
|
bar_width = fieldwidth - bargap
|
|
bar_width /= @data.length if stack == :side
|
|
x_mod = (@graph_width-bargap)/2 - (stack==:side ? bar_width/2 : 0)
|
|
|
|
bottom = @graph_height
|
|
|
|
field_count = 0
|
|
@config[:fields].each_index { |i|
|
|
dataset_count = 0
|
|
for dataset in @data
|
|
|
|
# cases (assume 0 = +ve):
|
|
# value min length
|
|
# +ve +ve value - min
|
|
# +ve -ve value - 0
|
|
# -ve -ve value.abs - 0
|
|
|
|
value = dataset[:data][i]
|
|
|
|
left = (fieldwidth * field_count)
|
|
|
|
length = (value.abs - (minvalue > 0 ? minvalue : 0)) * unit_size
|
|
# top is 0 if value is negative
|
|
top = bottom - (((value < 0 ? 0 : value) - minvalue) * unit_size)
|
|
left += bar_width * dataset_count if stack == :side
|
|
|
|
@graph.add_element( "rect", {
|
|
"x" => left.to_s,
|
|
"y" => top.to_s,
|
|
"width" => bar_width.to_s,
|
|
"height" => length.to_s,
|
|
"class" => "fill#{dataset_count+1}"
|
|
})
|
|
|
|
make_datapoint_text(left + bar_width/2.0, top - 6, value.to_s)
|
|
dataset_count += 1
|
|
end
|
|
field_count += 1
|
|
}
|
|
end
|
|
end
|
|
end
|
|
end
|