diff lib/SVG/Graph/Line.rb @ 0:513646585e45

* Import Redmine trunk SVN rev 3859

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/lib/SVG/Graph/Line.rb	Fri Jul 23 15:52:44 2010 +0100
@@ -0,0 +1,444 @@
+require 'SVG/Graph/Graph'
+
+module SVG
+  module Graph
+    # === Create presentation quality SVG line graphs easily
+    # 
+    # = Synopsis
+    # 
+    #   require 'SVG/Graph/Line'
+    # 
+    #   fields = %w(Jan Feb Mar);
+    #   data_sales_02 = [12, 45, 21]
+    #   data_sales_03 = [15, 30, 40]
+    #   
+    #   graph = SVG::Graph::Line.new({
+    #   	:height => 500,
+    #    	:width => 300,
+    # 	  :fields => fields,
+    #   })
+    #   
+    #   graph.add_data({
+    #   	:data => data_sales_02,
+    # 	  :title => 'Sales 2002',
+    #   })
+    # 
+    #   graph.add_data({
+    #   	:data => data_sales_03,
+    # 	  :title => 'Sales 2003',
+    #   })
+    #   
+    #   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 line 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.
+    # 
+    # = Examples
+    # 
+    # http://www.germane-software/repositories/public/SVG/test/single.rb
+    # 
+    # = Notes
+    # 
+    # The default stylesheet handles upto 10 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 10 data sets as they will have no style and
+    # be in black.
+    # 
+    # = See also
+    # 
+    # * SVG::Graph::Graph
+    # * SVG::Graph::BarHorizontal
+    # * SVG::Graph::Bar
+    # * SVG::Graph::Pie
+    # * SVG::Graph::Plot
+    # * SVG::Graph::TimeSeries
+    #
+    # == Author
+    #
+    # Sean E. Russell <serATgermaneHYPHENsoftwareDOTcom>
+    #
+    # Copyright 2004 Sean E. Russell
+    # This software is available under the Ruby license[LICENSE.txt]
+    #
+    class Line < SVG::Graph::Graph
+      #    Show a small circle on the graph where the line
+      #    goes from one point to the next.
+      attr_accessor :show_data_points
+      #    Accumulates each data set. (i.e. Each point increased by sum of 
+      #   all previous series at same point). Default is 0, set to '1' to show.
+      attr_accessor :stacked
+      # Fill in the area under the plot if true
+      attr_accessor :area_fill
+
+      # The constructor takes a hash reference, fields (the names for each
+      # field on the X axis) MUST be set, all other values are defaulted to 
+      # those shown above - with the exception of style_sheet which defaults
+      # to using the internal style sheet.
+      def initialize config
+        raise "fields was not supplied or is empty" unless config[:fields] &&
+        config[:fields].kind_of?(Array) &&
+        config[:fields].length > 0
+				super
+			end
+
+      # In addition to the defaults set in Graph::initialize, sets
+      # [show_data_points] true
+      # [show_data_values] true
+      # [stacked] false
+      # [area_fill] false
+			def set_defaults
+        init_with(
+          :show_data_points   => true,
+          :show_data_values   => true,
+          :stacked            => false,
+          :area_fill          => false
+        )
+
+        self.top_align = self.top_font = self.right_align = self.right_font = 1
+      end
+
+      protected
+
+      def max_value
+        max = 0
+        
+        if (stacked == true) then
+          sums = Array.new(@config[:fields].length).fill(0)
+
+          @data.each do |data|
+            sums.each_index do |i|
+              sums[i] += data[:data][i].to_f
+            end
+          end
+          
+          max = sums.max
+        else
+          max = @data.collect{|x| x[:data].max}.max
+        end
+
+        return max
+      end
+
+      def min_value
+        min = 0
+        
+        if (min_scale_value.nil? == false) then
+          min = min_scale_value
+        elsif (stacked == true) then
+          min = @data[-1][:data].min
+        else
+          min = @data.collect{|x| x[:data].min}.min
+        end
+
+        return min
+      end
+
+      def get_x_labels
+        @config[:fields]
+      end
+
+      def calculate_left_margin
+        super
+        label_left = @config[:fields][0].length / 2 * font_size * 0.6
+        @border_left = label_left if label_left > @border_left
+      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 calc_coords(field, value, width = field_width, height = field_height)
+        coords = {:x => 0, :y => 0}
+        coords[:x] = width * field
+        coords[:y] = @graph_height - value * height
+      
+        return coords
+      end
+
+      def draw_data
+        minvalue = min_value
+        fieldheight = (@graph_height.to_f - font_size*2*top_font) / 
+                         (get_y_labels.max - get_y_labels.min)
+        fieldwidth = field_width
+        line = @data.length
+
+        prev_sum = Array.new(@config[:fields].length).fill(0)
+        cum_sum = Array.new(@config[:fields].length).fill(-minvalue)
+
+        for data in @data.reverse
+          lpath = ""
+          apath = ""
+
+          if not stacked then cum_sum.fill(-minvalue) end
+          
+          data[:data].each_index do |i|
+            cum_sum[i] += data[:data][i]
+            
+            c = calc_coords(i, cum_sum[i], fieldwidth, fieldheight)
+            
+            lpath << "#{c[:x]} #{c[:y]} "
+          end
+        
+          if area_fill
+            if stacked then
+              (prev_sum.length - 1).downto 0 do |i|
+                c = calc_coords(i, prev_sum[i], fieldwidth, fieldheight)
+                
+                apath << "#{c[:x]} #{c[:y]} "
+              end
+          
+              c = calc_coords(0, prev_sum[0], fieldwidth, fieldheight)
+            else
+              apath = "V#@graph_height"
+              c = calc_coords(0, 0, fieldwidth, fieldheight)
+            end
+              
+            @graph.add_element("path", {
+              "d" => "M#{c[:x]} #{c[:y]} L" + lpath + apath + "Z",
+              "class" => "fill#{line}"
+            })
+          end
+        
+          @graph.add_element("path", {
+            "d" => "M0 #@graph_height L" + lpath,
+            "class" => "line#{line}"
+          })
+          
+          if show_data_points || show_data_values
+            cum_sum.each_index do |i|
+              if show_data_points
+                @graph.add_element( "circle", {
+                  "cx" => (fieldwidth * i).to_s,
+                  "cy" => (@graph_height - cum_sum[i] * fieldheight).to_s,
+                  "r" => "2.5",
+                  "class" => "dataPoint#{line}"
+                })
+              end
+              make_datapoint_text( 
+                fieldwidth * i, 
+                @graph_height - cum_sum[i] * fieldheight - 6,
+                cum_sum[i] + minvalue
+              )
+            end
+          end
+
+          prev_sum = cum_sum.dup
+          line -= 1
+        end
+      end
+
+
+      def get_css
+        return <<EOL
+/* default line styles */
+.line1{
+	fill: none;
+	stroke: #ff0000;
+	stroke-width: 1px;	
+}
+.line2{
+	fill: none;
+	stroke: #0000ff;
+	stroke-width: 1px;	
+}
+.line3{
+	fill: none;
+	stroke: #00ff00;
+	stroke-width: 1px;	
+}
+.line4{
+	fill: none;
+	stroke: #ffcc00;
+	stroke-width: 1px;	
+}
+.line5{
+	fill: none;
+	stroke: #00ccff;
+	stroke-width: 1px;	
+}
+.line6{
+	fill: none;
+	stroke: #ff00ff;
+	stroke-width: 1px;	
+}
+.line7{
+	fill: none;
+	stroke: #00ffff;
+	stroke-width: 1px;	
+}
+.line8{
+	fill: none;
+	stroke: #ffff00;
+	stroke-width: 1px;	
+}
+.line9{
+	fill: none;
+	stroke: #ccc6666;
+	stroke-width: 1px;	
+}
+.line10{
+	fill: none;
+	stroke: #663399;
+	stroke-width: 1px;	
+}
+.line11{
+	fill: none;
+	stroke: #339900;
+	stroke-width: 1px;	
+}
+.line12{
+	fill: none;
+	stroke: #9966FF;
+	stroke-width: 1px;	
+}
+/* default fill styles */
+.fill1{
+	fill: #cc0000;
+	fill-opacity: 0.2;
+	stroke: none;
+}
+.fill2{
+	fill: #0000cc;
+	fill-opacity: 0.2;
+	stroke: none;
+}
+.fill3{
+	fill: #00cc00;
+	fill-opacity: 0.2;
+	stroke: none;
+}
+.fill4{
+	fill: #ffcc00;
+	fill-opacity: 0.2;
+	stroke: none;
+}
+.fill5{
+	fill: #00ccff;
+	fill-opacity: 0.2;
+	stroke: none;
+}
+.fill6{
+	fill: #ff00ff;
+	fill-opacity: 0.2;
+	stroke: none;
+}
+.fill7{
+	fill: #00ffff;
+	fill-opacity: 0.2;
+	stroke: none;
+}
+.fill8{
+	fill: #ffff00;
+	fill-opacity: 0.2;
+	stroke: none;
+}
+.fill9{
+	fill: #cc6666;
+	fill-opacity: 0.2;
+	stroke: none;
+}
+.fill10{
+	fill: #663399;
+	fill-opacity: 0.2;
+	stroke: none;
+}
+.fill11{
+	fill: #339900;
+	fill-opacity: 0.2;
+	stroke: none;
+}
+.fill12{
+	fill: #9966FF;
+	fill-opacity: 0.2;
+	stroke: none;
+}
+/* default line styles */
+.key1,.dataPoint1{
+	fill: #ff0000;
+	stroke: none;
+	stroke-width: 1px;	
+}
+.key2,.dataPoint2{
+	fill: #0000ff;
+	stroke: none;
+	stroke-width: 1px;	
+}
+.key3,.dataPoint3{
+	fill: #00ff00;
+	stroke: none;
+	stroke-width: 1px;	
+}
+.key4,.dataPoint4{
+	fill: #ffcc00;
+	stroke: none;
+	stroke-width: 1px;	
+}
+.key5,.dataPoint5{
+	fill: #00ccff;
+	stroke: none;
+	stroke-width: 1px;	
+}
+.key6,.dataPoint6{
+	fill: #ff00ff;
+	stroke: none;
+	stroke-width: 1px;	
+}
+.key7,.dataPoint7{
+	fill: #00ffff;
+	stroke: none;
+	stroke-width: 1px;	
+}
+.key8,.dataPoint8{
+	fill: #ffff00;
+	stroke: none;
+	stroke-width: 1px;	
+}
+.key9,.dataPoint9{
+	fill: #cc6666;
+	stroke: none;
+	stroke-width: 1px;	
+}
+.key10,.dataPoint10{
+	fill: #663399;
+	stroke: none;
+	stroke-width: 1px;	
+}
+.key11,.dataPoint11{
+	fill: #339900;
+	stroke: none;
+	stroke-width: 1px;	
+}
+.key12,.dataPoint12{
+	fill: #9966FF;
+	stroke: none;
+	stroke-width: 1px;	
+}
+EOL
+      end
+    end
+  end
+end