Class: SVG::Graph::ErrBar

Inherits:
BarBase show all
Includes:
REXML
Defined in:
lib/SVG/Graph/ErrBar.rb

Overview

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[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

See also

  • SVG::Graph::Graph

  • SVG::Graph::BarHorizontal

  • SVG::Graph::Line

  • SVG::Graph::Pie

  • SVG::Graph::Plot

  • SVG::Graph::TimeSeries

Instance Attribute Summary

Attributes inherited from BarBase

#bar_gap, #stack

Attributes inherited from Graph

#add_popups, #font_size, #graph_subtitle, #graph_title, #height, #key, #key_font_size, #key_position, #min_scale_value, #no_css, #number_format, #popup_radius, #rotate_x_labels, #rotate_y_labels, #scale_divisions, #scale_integers, #show_data_values, #show_graph_subtitle, #show_graph_title, #show_x_guidelines, #show_x_labels, #show_x_title, #show_y_guidelines, #show_y_labels, #show_y_title, #stagger_x_labels, #stagger_y_labels, #step_include_first_x_label, #step_x_labels, #style_sheet, #subtitle_font_size, #title_font_size, #width, #x_label_font_size, #x_title, #x_title_font_size, #x_title_location, #y_label_font_size, #y_title, #y_title_font_size, #y_title_location, #y_title_text_direction

Instance Method Summary collapse

Methods inherited from Graph

#add_data, #burn, #burn_svg_only, #clear_data

Constructor Details

#initialize(config) ⇒ ErrBar

Returns a new instance of ErrBar.



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# File 'lib/SVG/Graph/ErrBar.rb', line 61

def initialize config
    raise "fields was not supplied or is empty" unless config[:errorBars] &&
    config[:errorBars].kind_of?(Array) &&
    config[:errorBars].length > 0 
    super
end

Instance Method Details

#set_defaults ⇒ Object

See Graph::initialize and BarBase::set_defaults



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# File 'lib/SVG/Graph/ErrBar.rb', line 70

def set_defaults 
  super
  self.top_align = self.top_font = 1
end