begin require 'zlib' rescue # No Zlib. end require 'rexml/document' module SVG module Graph # === Base object for generating SVG Graphs # # == Synopsis # # This class is only used as a superclass of specialized charts. Do not # attempt to use this class directly, unless creating a new chart type. # # For examples of how to subclass this class, see the existing specific # subclasses, such as SVG::Graph::Pie. # # == Examples # # For examples of how to use this package, see either the test files, or # the documentation for the specific class you want to use. # # * file:test/plot.rb # * file:test/single.rb # * file:test/test.rb # * file:test/timeseries.rb # # == Description # # This package should be used as a base for creating SVG graphs. # # == Acknowledgements # # Leo Lapworth for creating the SVG::TT::Graph package which this Ruby # port is based on. # # Stephen Morgan for creating the TT template and SVG. # # == See # # * SVG::Graph::BarHorizontal # * SVG::Graph::Bar # * SVG::Graph::Line # * SVG::Graph::Pie # * SVG::Graph::Plot # * SVG::Graph::TimeSeries # # == Author # # Sean E. Russell # # Copyright 2004 Sean E. Russell # This software is available under the Ruby license[LICENSE.txt] # class Graph include REXML # Initialize the graph object with the graph settings. You won't # instantiate this class directly; see the subclass for options. # [width] 500 # [height] 300 # [x_axis_position] nil # [y_axis_position] nil # [show_x_guidelines] false # [show_y_guidelines] true # [show_data_values] true # [min_scale_value] 0 # [show_x_labels] true # [stagger_x_labels] false # [rotate_x_labels] false # [step_x_labels] 1 # [step_include_first_x_label] true # [show_y_labels] true # [rotate_y_labels] false # [scale_integers] false # [show_x_title] false # [x_title] 'X Field names' # [x_title_location] :middle | :end # [show_y_title] false # [y_title_text_direction] :bt | :tb # [y_title] 'Y Scale' # [y_title_location] :middle | :end # [show_graph_title] false # [graph_title] 'Graph Title' # [show_graph_subtitle] false # [graph_subtitle] 'Graph Sub Title' # [key] true, # [key_position] :right, # bottom or righ # [font_size] 12 # [title_font_size] 16 # [subtitle_font_size] 14 # [x_label_font_size] 12 # [x_title_font_size] 14 # [y_label_font_size] 12 # [y_title_font_size] 14 # [key_font_size] 10 # [no_css] false # [add_popups] false # [number_format] '%.2f' def initialize( config ) @config = config # array of Hash @data = [] #self.top_align = self.top_font = 0 #self.right_align = self.right_font = 0 init_with({ :width => 500, :height => 300, :show_x_guidelines => false, :show_y_guidelines => true, :show_data_values => true, :x_axis_position => nil, :y_axis_position => nil, :min_scale_value => nil, :show_x_labels => true, :stagger_x_labels => false, :rotate_x_labels => false, :step_x_labels => 1, :step_include_first_x_label => true, :show_y_labels => true, :rotate_y_labels => false, :stagger_y_labels => false, :scale_integers => false, :show_x_title => false, :x_title => 'X Field names', :x_title_location => :middle, # or :end :show_y_title => false, :y_title_text_direction => :bt, # other option is :tb :y_title => 'Y Scale', :y_title_location => :middle, # or :end :show_graph_title => false, :graph_title => 'Graph Title', :show_graph_subtitle => false, :graph_subtitle => 'Graph Sub Title', :key => true, :key_width => nil, :key_position => :right, # bottom or right :font_size => 12, :title_font_size => 16, :subtitle_font_size => 14, :x_label_font_size => 12, :y_label_font_size => 12, :x_title_font_size => 14, :y_title_font_size => 14, :key_font_size => 10, :key_box_size => 12, :key_spacing => 5, :no_css => false, :add_popups => false, :popup_radius => 10, :number_format => '%.2f', :style_sheet => '', :inline_style_sheet => '' }) set_defaults if self.respond_to? :set_defaults # override default values with user supplied values init_with config end # This method allows you do add data to the graph object. # It can be called several times to add more data sets in. # # data_sales_02 = [12, 45, 21]; # # graph.add_data({ # :data => data_sales_02, # :title => 'Sales 2002' # }) # @param conf [Hash] with the following keys: # :data [Array] mandatory # :title [String] mandatory name of data series for legend of graph # :description [Array] (optional) if given, description for each datapoint (shown in popups) # :shape [Array] (optional) if given, DataPoint shape is chosen based on this string instead of description # :url [Array] (optional) if given, link will be added to each datapoint def add_data(conf) @data ||= [] raise "No data provided by #{conf.inspect}" unless conf[:data].is_a?(Array) add_data_init_or_check_optional_keys(conf, conf[:data].size) @data << conf end # Checks all optional keys of the add_data method def add_data_init_or_check_optional_keys(conf, datasize) conf[:description] ||= Array.new(datasize) conf[:shape] ||= Array.new(datasize) conf[:url] ||= Array.new(datasize) if conf[:description].size != datasize raise "Description for popups does not have same size as provided data: #{conf[:description].size} vs #{conf[:data].size/2}" end if conf[:shape].size != datasize raise "Shapes for points do not have same size as provided data: #{conf[:shape].size} vs #{conf[:data].size/2}" end if conf[:url].size != datasize raise "URLs for points do not have same size as provided data: #{conf[:url].size} vs #{conf[:data].size/2}" end end # This method removes all data from the object so that you can # reuse it to create a new graph but with the same config options. # # graph.clear_data def clear_data @data = [] end # This method processes the template with the data and # config which has been set and returns the resulting SVG. # # This method will croak unless at least one data set has # been added to the graph object. # # print graph.burn # def burn raise "No data available" unless @data.size > 0 start_svg calculate_graph_dimensions @foreground = Element.new( "g" ) draw_graph draw_titles draw_legend draw_data # this method needs to be implemented by child classes @graph.add_element( @foreground ) style data = "" @doc.write( data, 0 ) if @config[:compress] if defined?(Zlib) inp, out = IO.pipe gz = Zlib::GzipWriter.new( out ) gz.write data gz.close data = inp.read else data << ""; end end return data end # Burns the graph but returns only the node as String without the # Doctype and XML Declaration. This allows easy integration into # existing xml documents. # # @return [String] the SVG node which represents the Graph def burn_svg_only # initialize all instance variables by burning the graph burn f = REXML::Formatters::Pretty.new(0) f.compact = true out = '' f.write(@root, out) return out end # Burns the graph to an SVG string and returns it with a text/html mime type to be # displayed in IRuby. # # @return [Array] A 2-dimension array containing the SVg string and a mime-type. This is the format expected by IRuby. def to_iruby ["text/html", burn_svg_only] end # Set the height of the graph box, this is the total height # of the SVG box created - not the graph it self which auto # scales to fix the space. attr_accessor :height # Set the width of the graph box, this is the total width # of the SVG box created - not the graph it self which auto # scales to fix the space. attr_accessor :width # Set the path/url to an external stylesheet, set to '' if # you want to revert back to using the defaut internal version. # # To create an external stylesheet create a graph using the # default internal version and copy the stylesheet section to # an external file and edit from there. attr_accessor :style_sheet # Define as String the stylesheet contents to be inlined, set to '' to disable. # This can be used, when referring to a url via :style_sheet is not suitable. # E.g. in situations where there will be no internet access or the graph must # consist of only one file. # # If not empty, the :style_sheet parameter (url) above will be ignored and is # not written to the file # see also https://github.com/erullmann/svg-graph2/commit/55eb6e983f6fcc69cc5a110d0ee6e05f906f639a # Default: '' attr_accessor :inline_style_sheet # (Bool) Show the value of each element of data on the graph attr_accessor :show_data_values # By default (nil/undefined) the x-axis is at the bottom of the graph. # With this property a custom position for the x-axis can be defined. # Valid values are between :min_scale_value and maximum value of the # data. # Default: nil attr_accessor :x_axis_position # By default (nil/undefined) the y-axis is the left border of the graph. # With this property a custom position for the y-axis can be defined. # Valid values are any values in the range of x-values (in case of a # Plot) or any of the :fields values (in case of Line/Bar Graphs, note # the '==' operator is used to find at which value to draw the axis). # Default: nil attr_accessor :y_axis_position # The point at which the Y axis starts, defaults to nil, # if set to nil it will default to the minimum data value. attr_accessor :min_scale_value # Whether to show labels on the X axis or not, defaults # to true, set to false if you want to turn them off. attr_accessor :show_x_labels # This puts the X labels at alternative levels so if they # are long field names they will not overlap so easily. # Default is false, to turn on set to true. attr_accessor :stagger_x_labels # This puts the Y labels at alternative levels so if they # are long field names they will not overlap so easily. # Default is false, to turn on set to true. attr_accessor :stagger_y_labels # This turns the X axis labels by 90 degrees when true or by a custom # amount when a numeric value is given. # Default is false, to turn on set to true. attr_accessor :rotate_x_labels # This turns the Y axis labels by 90 degrees when true or by a custom # amount when a numeric value is given. # Default is false, to turn on set to true or numeric value. attr_accessor :rotate_y_labels # How many "steps" to use between displayed X axis labels, # a step of one means display every label, a step of two results # in every other label being displayed (label label label), # a step of three results in every third label being displayed # (label label label) and so on. attr_accessor :step_x_labels # Whether to (when taking "steps" between X axis labels) step from # the first label (i.e. always include the first label) or step from # the X axis origin (i.e. start with a gap if step_x_labels is greater # than one). attr_accessor :step_include_first_x_label # Whether to show labels on the Y axis or not, defaults # to true, set to false if you want to turn them off. attr_accessor :show_y_labels # Ensures only whole numbers are used as the scale divisions. # Default is false, to turn on set to true. This has no effect if # scale divisions are less than 1. attr_accessor :scale_integers # This defines the gap between markers on the Y axis, # default is a 10th of the max_value, e.g. you will have # 10 markers on the Y axis. NOTE: do not set this too # low - you are limited to 999 markers, after that the # graph won't generate. attr_accessor :scale_divisions # Whether to show the title under the X axis labels, # default is false, set to true to show. attr_accessor :show_x_title # What the title under X axis should be, e.g. 'Months'. attr_accessor :x_title # Where the x_title should be positioned, either in the :middle of the axis or # at the :end of the axis. Defaults to :middle attr_accessor :x_title_location # Whether to show the title under the Y axis labels, # default is false, set to true to show. attr_accessor :show_y_title # Aligns writing mode for Y axis label. # Defaults to :bt (Bottom to Top). # Change to :tb (Top to Bottom) to reverse. attr_accessor :y_title_text_direction # What the title under Y axis should be, e.g. 'Sales in thousands'. attr_accessor :y_title # Where the y_title should be positioned, either in the :middle of the axis or # at the :end of the axis. Defaults to :middle attr_accessor :y_title_location # Whether to show a title on the graph, defaults # to false, set to true to show. attr_accessor :show_graph_title # What the title on the graph should be. attr_accessor :graph_title # Whether to show a subtitle on the graph, defaults # to false, set to true to show. attr_accessor :show_graph_subtitle # What the subtitle on the graph should be. attr_accessor :graph_subtitle # Whether to show a key (legend), defaults to true, set to # false if you want to hide it. attr_accessor :key # Where the key should be positioned, defaults to # :right, set to :bottom if you want to move it. attr_accessor :key_position attr_accessor :key_box_size attr_accessor :key_spacing attr_accessor :key_width # Set the font size (in points) of the data point labels. # Defaults to 12. attr_accessor :font_size # Set the font size of the X axis labels. # Defaults to 12. attr_accessor :x_label_font_size # Set the font size of the X axis title. # Defaults to 14. attr_accessor :x_title_font_size # Set the font size of the Y axis labels. # Defaults to 12. attr_accessor :y_label_font_size # Set the font size of the Y axis title. # Defaults to 14. attr_accessor :y_title_font_size # Set the title font size. # Defaults to 16. attr_accessor :title_font_size # Set the subtitle font size. # Defaults to 14. attr_accessor :subtitle_font_size # Set the key font size. # Defaults to 10. attr_accessor :key_font_size # Show guidelines for the X axis, default is false attr_accessor :show_x_guidelines # Show guidelines for the Y axis, default is true attr_accessor :show_y_guidelines # Do not use CSS if set to true. Many SVG viewers do not support CSS, but # not using CSS can result in larger SVGs as well as making it impossible to # change colors after the chart is generated. Defaults to false. attr_accessor :no_css # Add popups for the data points on some graphs, default is false. attr_accessor :add_popups # Customize popup radius attr_accessor :popup_radius # Number format values and Y axis representation like 1.2345667 represent as 1.23, # Any valid format accepted by sprintf can be specified. # If you don't want to change the format in any way you can use "%s". Defaults to "%.2f" attr_accessor :number_format protected # implementation of a multiple array sort used for Schedule and Plot def sort( *arrys ) new_arrys = arrys.transpose.sort_by(&:first).transpose new_arrys.each_index { |k| arrys[k].replace(new_arrys[k]) } end # Overwrite configuration options with supplied options. Used # by subclasses. def init_with config config.each { |key, value| self.send( key.to_s+"=", value ) if self.respond_to? key } end # Override this (and call super) to change the margin to the left # of the plot area. Results in @border_left being set. # # By default it is 7 + max label height(font size or string length, depending on rotate) + title height def calculate_left_margin @border_left = 7 # Check size of Y labels @border_left += max_y_label_width_px if (show_y_title && (y_title_location ==:middle)) @border_left += y_title_font_size + 5 end end # Calculates the width of the widest Y label. This will be the # character height if the Y labels are rotated. Returns 0 if labels # are not shown def max_y_label_width_px return 0 if !show_y_labels base_width = y_label_font_size + 3 if rotate_y_labels == true self.rotate_y_labels = 90 end if rotate_y_labels == false self.rotate_y_labels = 0 end # don't change rotate_y_label, if neither true nor false label_width = get_longest_label(get_y_labels).to_s.length * y_label_font_size * 0.5 rotated_width = label_width * Math.cos( rotate_y_labels * Math::PI / 180).abs() max_width = base_width + rotated_width if stagger_y_labels max_width += 5 + y_label_font_size end return max_width end # Override this (and call super) to change the margin to the right # of the plot area. Results in @border_right being set. # # By default it is 7 + width of the key if it is placed on the right # or the maximum of this value or the tilte length (if title is placed at :end) def calculate_right_margin @border_right = 7 if key and key_position == :right val = keys.max { |a,b| a.length <=> b.length } @border_right += val.length * key_font_size * 0.6 @border_right += key_box_size @border_right += 10 # Some padding around the box if key_width.nil? @border_right else @border_right = [key_width, @border_right].min end end if (x_title_location == :end) @border_right = [@border_right, x_title.length * x_title_font_size * 0.6].max end end # Override this (and call super) to change the margin to the top # of the plot area. Results in @border_top being set. # # This is 5 + the Title size + 5 + subTitle size def calculate_top_margin @border_top = 5 @border_top += [title_font_size, y_title_font_size].max if (show_graph_title || (y_title_location ==:end)) @border_top += 5 @border_top += subtitle_font_size if show_graph_subtitle end def add_datapoint_text_and_popup( x, y, label ) add_popup( x, y, label ) make_datapoint_text( x, y, label ) end # Adds pop-up point information to a graph only if the config option is set. def add_popup( x, y, label, style="", url="" ) if add_popups if( numeric?(label) ) label = @number_format % label end txt_width = label.length * font_size * 0.6 + 10 tx = (x+txt_width > @graph_width ? x-5 : x+5) g = Element.new( "g" ) g.attributes["id"] = g.object_id.to_s g.attributes["visibility"] = "hidden" # First add the mask t = g.add_element( "text", { "x" => tx.to_s, "y" => (y - font_size).to_s, "class" => "dataPointPopupMask" }) t.attributes["style"] = style + (x+txt_width > @graph_width ? "text-anchor: end;" : "text-anchor: start;") t.text = label.to_s # Then add the text t = g.add_element( "text", { "x" => tx.to_s, "y" => (y - font_size).to_s, "class" => "dataPointPopup" }) t.attributes["style"] = style + (x+txt_width > @graph_width ? "text-anchor: end;" : "text-anchor: start;") t.text = label.to_s @foreground.add_element( g ) # add a circle to catch the mouseover mouseover = Element.new( "circle" ) mouseover.add_attributes({ "cx" => x.to_s, "cy" => y.to_s, "r" => "#{popup_radius}", "style" => "opacity: 0", "onmouseover" => "document.getElementById(#{g.object_id.to_s}).style.visibility ='visible'", "onmouseout" => "document.getElementById(#{g.object_id.to_s}).style.visibility = 'hidden'", }) if !url.nil? href = Element.new("a") href.add_attribute("xlink:href", url) href.add_element(mouseover) @foreground.add_element(href) else @foreground.add_element(mouseover) end elsif !url.nil? # add a circle to catch the mouseover mouseover = Element.new( "circle" ) mouseover.add_attributes({ "cx" => x.to_s, "cy" => y.to_s, "r" => "#{popup_radius}", "style" => "opacity: 0", }) href = Element.new("a") href.add_attribute("xlink:href", url) href.add_element(mouseover) @foreground.add_element(href) end # if add_popups end # def add_popup # returns the longest label from an array of labels as string # each object in the array must support .to_s def get_longest_label(arry) longest_label = arry.max{|a,b| # respect number_format a = @number_format % a if numeric?(a) b = @number_format % b if numeric?(b) a.to_s.length <=> b.to_s.length } longest_label = @number_format % longest_label if numeric?(longest_label) return longest_label end # Override this (and call super) to change the margin to the bottom # of the plot area. Results in @border_bottom being set. # # 7 + max label height(font size or string length, depending on rotate) + title height def calculate_bottom_margin @border_bottom = 7 if key and key_position == :bottom @border_bottom += @data.size * (font_size + 5) @border_bottom += 10 end @border_bottom += max_x_label_height_px if (show_x_title && (x_title_location ==:middle)) @border_bottom += x_title_font_size + 5 end end # returns the maximum height of the labels respect the rotation or 0 if # the labels are not shown def max_x_label_height_px return 0 if !show_x_labels if rotate_x_labels max_height = get_longest_label(get_x_labels).to_s.length * x_label_font_size * 0.6 else max_height = x_label_font_size + 3 end max_height += 5 + x_label_font_size if stagger_x_labels return max_height end # Draws the background, axis, and labels. def draw_graph @graph = @root.add_element( "g", { "transform" => "translate( #@border_left #@border_top )" }) # Background @graph.add_element( "rect", { "x" => "0", "y" => "0", "width" => @graph_width.to_s, "height" => @graph_height.to_s, "class" => "graphBackground" }) draw_x_axis draw_y_axis draw_x_labels draw_y_labels end # draws the x-axis; can be overridden by child classes def draw_x_axis # relative position on y-axis (hence @graph_height is our axis length) relative_position = calculate_rel_position(get_y_labels, field_height, @x_axis_position, @graph_height) # X-Axis y_offset = (1 - relative_position) * @graph_height @graph.add_element( "path", { "d" => "M 0 #{y_offset} h#@graph_width", "class" => "axis", "id" => "yAxis" }) end # draws the y-axis; can be overridden by child classes def draw_y_axis # relative position on x-axis (hence @graph_width is our axis length) relative_position = calculate_rel_position(get_x_labels, field_width, @y_axis_position, @graph_width) # Y-Axis x_offset = relative_position * @graph_width @graph.add_element( "path", { "d" => "M #{x_offset} 0 v#@graph_height", "class" => "axis", "id" => "xAxis" }) end # calculates the relative position betewen 0 and 1 of a value on the axis # can be multiplied with either @graph_height or @graph_width to get the # absolute position in pixels. # If labels are strings, checks if one of label matches with the value # and returns this position. # If labels are numeric, compute relative position between first and last value # If nothing else applies or the value is nil, the relative position is 0 # @param labels [Array] the array of x or y labels, see {#get_x_labels} or {#get_y_labels} # @param segment_px [Float] number of pixels per label, see {#field_width} or {#field_height} # @param value [Numeric, String] the value for which the relative position is computed # @param axis_length [Numeric] either @graph_width or @graph_height # @return [Float] relative position between 0 and 1, returns 0 def calculate_rel_position(labels, segment_px, value, axis_length) # default value, y-axis on the left side, or x-axis at bottom # puts "calculate_rel_position:" # p labels # p segment_px # p value # p axis_length relative_position = 0 if !value.nil? # only if (labels[0].is_a? Numeric) && (labels[-1].is_a? Numeric) && (value.is_a? Numeric) # labels are numeric, compute relative position between first and last value range = labels[-1] - labels[0] position = value - labels[0] # compute how many segments long the offset is relative_to_segemts = position/range * (labels.size - 1) # convert from segments to relative position on the axis axis, # the number of segments (i.e. relative_to_segemts >= 1) relative_position = relative_to_segemts * segment_px / axis_length elsif labels[0].is_a? String # labels are strings, see if one of label matches with the position # and place the axis there index = labels.index(value) if !index.nil? # index would be nil if label is not found offset_px = segment_px * index relative_position = offset_px/axis_length # between 0 and 1 end end end # value.nil? return relative_position end # Where in the X area the label is drawn # Centered in the field, should be width/2. Start, 0. def x_label_offset( width ) 0 end # check if an object can be converted to float def numeric?(object) # true if Float(object) rescue false object.is_a? Numeric end # adds the datapoint text to the graph only if the config option is set def make_datapoint_text( x, y, value, style="" ) if show_data_values textStr = value if( numeric?(value) ) textStr = @number_format % value end # change anchor is label overlaps axis, normally anchor is middle (that's why we compute length/2) if x < textStr.length/2 * font_size style << "text-anchor: start;" elsif x > @graph_width - textStr.length/2 * font_size style << "text-anchor: end;" end # background for better readability text = @foreground.add_element( "text", { "x" => x.to_s, "y" => y.to_s, "class" => "dataPointLabelBackground", }) text.text = textStr text.attributes["style"] = style if style.length > 0 # actual label text = @foreground.add_element( "text", { "x" => x.to_s, "y" => y.to_s, "class" => "dataPointLabel" }) text.text = textStr text.attributes["style"] = style if style.length > 0 end end # Draws the X axis labels. The x-axis (@graph_width) is diveded into # {#get_x_labels.length} equal sections. The (center) x-coordinate for a # label hence is label_index * width_of_section def draw_x_labels stagger = x_label_font_size + 5 label_width = field_width count = 0 x_axis_already_drawn = false for label in get_x_labels if step_include_first_x_label == true then step = count % step_x_labels else step = (count + 1) % step_x_labels end # only draw every n-th label as defined by step_x_labels if step == 0 && show_x_labels then textStr = label.to_s if( numeric?(label) ) textStr = @number_format % label end text = @graph.add_element( "text" ) text.attributes["class"] = "xAxisLabels" text.text = textStr x = count * label_width + x_label_offset( label_width ) y = @graph_height + x_label_font_size + 3 #t = 0 - (font_size / 2) if stagger_x_labels and count % 2 == 1 y += stagger @graph.add_element( "path", { "d" => "M#{x} #@graph_height v#{stagger}", "class" => "staggerGuideLine" }) end text.attributes["x"] = x.to_s text.attributes["y"] = y.to_s if rotate_x_labels degrees = 90 if numeric? rotate_x_labels degrees = rotate_x_labels end text.attributes["transform"] = "rotate( #{degrees} #{x} #{y-x_label_font_size} )"+ " translate( 0 -#{x_label_font_size/4} )" text.attributes["style"] = "text-anchor: start" else text.attributes["style"] = "text-anchor: middle" end end # if step == 0 && show_x_labels draw_x_guidelines( label_width, count ) if show_x_guidelines count += 1 end # for label in get_x_labels end # draw_x_labels # Where in the Y area the label is drawn # Centered in the field, should be width/2. Start, 0. def y_label_offset( height ) 0 end # override this method in child class # must return the array of labels for the x-axis def get_x_labels end # override this method in child class # must return the array of labels for the y-axis # this method defines @y_scale_division def get_y_labels end # space in px between x-labels def field_width # -1 is to use entire x-axis # otherwise there is always 1 division unused @graph_width.to_f / ( get_x_labels.length - 1 ) end # space in px between the y-labels def field_height #(@graph_height.to_f - font_size*2*top_font) / # (get_y_labels.length - top_align) @graph_height.to_f / get_y_labels.length end # Draws the Y axis labels, the Y-Axis (@graph_height) is divided equally into #get_y_labels.lenght sections # So the y coordinate for an arbitrary value is calculated as follows: # y = @graph_height equals the min_value # #normalize value of a single scale_division: # count = value /(@y_scale_division) # y = @graph_height - count * field_height # def draw_y_labels stagger = y_label_font_size + 5 label_height = field_height label_width = max_y_label_width_px count = 0 y_offset = @graph_height + y_label_offset( label_height ) y_offset += font_size/3.0 for label in get_y_labels if show_y_labels # x = 0, y = 0 is top left right next to graph area y = y_offset - (label_height * count) # instead of calculating the middle anchor position, simply use # static offset and anchor end to right-align the labels. See line :936 below. #x = -label_width/2.0 + y_label_font_size/2.0 x = 3 if stagger_y_labels and count % 2 == 1 x -= stagger @graph.add_element( "path", { "d" => "M0 #{y} h#{-stagger}", "class" => "staggerGuideLine" }) end text = @graph.add_element( "text", { "x" => x.to_s, "y" => y.to_s, "class" => "yAxisLabels" }) textStr = label.to_s if( numeric?(label) ) textStr = @number_format % label end text.text = textStr # note text-anchor is at bottom of textfield #text.attributes["style"] = "text-anchor: middle" text.attributes["style"] = "text-anchor: end" degrees = rotate_y_labels text.attributes["transform"] = "translate( -#{font_size} 0 ) " + "rotate( #{degrees} #{x} #{y} ) " # text.attributes["y"] = (y - (y_label_font_size/2)).to_s end # if show_y_labels draw_y_guidelines( label_height, count ) if show_y_guidelines count += 1 end # for label in get_y_labels end # draw_y_labels # Draws the X axis guidelines, parallel to the y-axis def draw_x_guidelines( label_height, count ) if count != 0 @graph.add_element( "path", { "d" => "M#{label_height*count} 0 v#@graph_height", "class" => "guideLines" }) end end # Draws the Y axis guidelines, parallel to the x-axis def draw_y_guidelines( label_height, count ) if count != 0 @graph.add_element( "path", { "d" => "M0 #{@graph_height-(label_height*count)} h#@graph_width", "class" => "guideLines" }) end end # Draws the graph title and subtitle def draw_titles if show_graph_title @root.add_element( "text", { "x" => (width / 2).to_s, "y" => (title_font_size).to_s, "class" => "mainTitle" }).text = graph_title.to_s end if show_graph_subtitle y_subtitle = show_graph_title ? title_font_size + subtitle_font_size + 5 : subtitle_font_size @root.add_element("text", { "x" => (width / 2).to_s, "y" => (y_subtitle).to_s, "class" => "subTitle" }).text = graph_subtitle.to_s end if show_x_title if (x_title_location == :end) y = @graph_height + @border_top + x_title_font_size/2.0 x = @border_left + @graph_width + x_title.length * x_title_font_size * 0.6/2.0 else y = @graph_height + @border_top + x_title_font_size + max_x_label_height_px x = @border_left + @graph_width / 2 end @root.add_element("text", { "x" => x.to_s, "y" => y.to_s, "class" => "xAxisTitle", }).text = x_title.to_s end if show_y_title if (y_title_location == :end) x = y_title.length * y_title_font_size * 0.6/2.0 # positioning is not optimal but ok for now y = @border_top - y_title_font_size/2.0 else x = y_title_font_size + (y_title_text_direction==:bt ? 3 : -3) y = @border_top + @graph_height / 2 end text = @root.add_element("text", { "x" => x.to_s, "y" => y.to_s, "class" => "yAxisTitle", }) text.text = y_title.to_s # only rotate text if it is at the middle left of the y-axis # ignore the text_direction if y_title_location is set to :end if (y_title_location != :end) if y_title_text_direction == :bt text.attributes["transform"] = "rotate( -90, #{x}, #{y} )" else text.attributes["transform"] = "rotate( 90, #{x}, #{y} )" end end end end # draw_titles def keys i = 0 return @data.collect{ |d| i+=1; d[:title] || "Serie #{i}" } end # Draws the legend on the graph def draw_legend if key group = @root.add_element( "g" ) key_count = 0 for key_name in keys y_offset = (key_box_size * key_count) + (key_count * key_spacing) group.add_element( "rect", { "x" => 0.to_s, "y" => y_offset.to_s, "width" => key_box_size.to_s, "height" => key_box_size.to_s, "class" => "key#{key_count+1}" }) group.add_element( "text", { "x" => (key_box_size + key_spacing).to_s, "y" => (y_offset + key_box_size).to_s, "class" => "keyText" }).text = key_name.to_s key_count += 1 end case key_position when :right x_offset = @graph_width + @border_left + (key_spacing * 2) y_offset = @border_top + (key_spacing * 2) when :bottom x_offset = @border_left + (key_spacing * 2) y_offset = @border_top + @graph_height + key_spacing if show_x_labels y_offset += max_x_label_height_px end y_offset += x_title_font_size + key_spacing if show_x_title end group.attributes["transform"] = "translate(#{x_offset} #{y_offset})" end end private def style if no_css styles = parse_css @root.elements.each("//*[@class]") { |el| cl = el.attributes["class"] style = styles[cl] style += el.attributes["style"] if el.attributes["style"] el.attributes["style"] = style } end end def parse_css css = get_style rv = {} while css =~ /^(\.(\w+)(?:\s*,\s*\.\w+)*)\s*\{/m names = $1 css = $' css =~ /([^}]+)\}/m content = $1 css = $' nms = [] while names =~ /^\s*,?\s*\.(\w+)/ nms << $1 names = $' end content = content.tr( "\n\t", " ") for name in nms current = rv[name] current = current ? current+"; "+content : content rv[name] = current.strip.squeeze(" ") end end return rv end # Override and place code to add defs here # @param defs [REXML::Element] def add_defs defs end # Creates the XML document and adds the root svg element with # the width, height and viewBox attributes already set. # The element is stored as @root. # # In addition a rectangle background of the same size as the # svg is added. # def start_svg # Base document @doc = Document.new @doc << XMLDecl.new @doc << DocType.new( %q{svg PUBLIC "-//W3C//DTD SVG 1.0//EN" } + %q{"http://www.w3.org/TR/2001/REC-SVG-20010904/DTD/svg10.dtd"} ) if style_sheet && style_sheet != '' && inline_style_sheet.to_s.empty? # if inline_style_sheet is defined, url style sheet is ignored @doc << Instruction.new( "xml-stylesheet", %Q{href="#{style_sheet}" type="text/css"} ) end @root = @doc.add_element( "svg", { "width" => width.to_s, "height" => height.to_s, "viewBox" => "0 0 #{width} #{height}", "xmlns" => "http://www.w3.org/2000/svg", "xmlns:xlink" => "http://www.w3.org/1999/xlink", "xmlns:a3" => "http://ns.adobe.com/AdobeSVGViewerExtensions/3.0/", "a3:scriptImplementation" => "Adobe" }) @root << Comment.new( " "+"\\"*66 ) @root << Comment.new( " Created with SVG::Graph " ) @root << Comment.new( " SVG::Graph by Sean E. Russell " ) @root << Comment.new( " Losely based on SVG::TT::Graph for Perl by"+ " Leo Lapworth & Stephan Morgan " ) @root << Comment.new( " "+"/"*66 ) defs = @root.add_element( "defs" ) add_defs defs if !no_css if inline_style_sheet && inline_style_sheet != '' style = defs.add_element( "style", {"type"=>"text/css"} ) style << CData.new( inline_style_sheet ) else @root << Comment.new(" include default stylesheet if none specified ") style = defs.add_element( "style", {"type"=>"text/css"} ) style << CData.new( get_style ) end end @root << Comment.new( "SVG Background" ) @root.add_element( "rect", { "width" => width.to_s, "height" => height.to_s, "x" => "0", "y" => "0", "class" => "svgBackground" }) end # def calculate_graph_dimensions calculate_left_margin calculate_right_margin calculate_bottom_margin calculate_top_margin @graph_width = width - @border_left - @border_right @graph_height = height - @border_top - @border_bottom end def get_style return <