Class | SVG::Graph::Plot |
In: |
SVG/Graph/Plot.rb
|
Parent: | Graph |
require 'SVG/Graph/Plot' # Data sets are x,y pairs # Note that multiple data sets can differ in length, and that the # data in the datasets needn't be in order; they will be ordered # by the plot along the X-axis. projection = [ 6, 11, 0, 5, 18, 7, 1, 11, 13, 9, 1, 2, 19, 0, 3, 13, 7, 9 ] actual = [ 0, 18, 8, 15, 9, 4, 18, 14, 10, 2, 11, 6, 14, 12, 15, 6, 4, 17, 2, 12 ] graph = SVG::Graph::Plot.new({ :height => 500, :width => 300, :key => true, :scale_x_integers => true, :scale_y_integerrs => true, }) graph.add_data({ :data => projection :title => 'Projected', }) graph.add_data({ :data => actual, :title => 'Actual', }) print graph.burn()
Produces a graph of scalar data.
This object aims to allow you to easily create high quality SVG scalar plots. 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.
www.germane-software/repositories/public/SVG/test/plot.rb
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.
Unlike the other types of charts, data sets must contain x,y pairs:
[ 1, 2 ] # A data set with 1 point: (1,2) [ 1,2, 5,6] # A data set with 2 points: (1,2) and (5,6)
Sean E. Russell <serATgermaneHYPHENsoftwareDOTcom>
Copyright 2004 Sean E. Russell This software is available under the Ruby license
X | = | 0 |
Y | = | 1 |
area_fill | [RW] | Fill the area under the line |
min_x_value | [RW] | Set the minimum value of the X axis |
min_y_value | [RW] | Set the minimum value of the Y axis |
scale_x_divisions | [RW] |
Determines the scaling for the X axis divisions.
graph.scale_x_divisions = 2 would cause the graph to attempt to generate labels stepped by 2; EG: 0,2,4,6,8… |
scale_x_integers | [RW] | Make the X axis labels integers |
scale_y_divisions | [RW] |
Determines the scaling for the Y axis divisions.
graph.scale_y_divisions = 0.5 would cause the graph to attempt to generate labels stepped by 0.5; EG: 0, 0.5, 1, 1.5, 2, … |
scale_y_integers | [RW] | Make the Y axis labels integers |
show_data_points | [RW] | Show a small circle on the graph where the line goes from one point to the next. |
Adds data to the plot. The data must be in X,Y pairs; EG
[ 1, 2 ] # A data set with 1 point: (1,2) [ 1,2, 5,6] # A data set with 2 points: (1,2) and (5,6)
# File SVG/Graph/Plot.rb, line 137 137: def add_data data 138: @data = [] unless @data 139: 140: raise "No data provided by #{conf.inspect}" unless data[:data] and 141: data[:data].kind_of? Array 142: raise "Data supplied must be x,y pairs! "+ 143: "The data provided contained an odd set of "+ 144: "data points" unless data[:data].length % 2 == 0 145: return if data[:data].length == 0 146: 147: x = [] 148: y = [] 149: data[:data].each_index {|i| 150: (i%2 == 0 ? x : y) << data[:data][i] 151: } 152: sort( x, y ) 153: data[:data] = [x,y] 154: @data << data 155: end
In addition to the defaults set by Graph::initialize, sets
# File SVG/Graph/Plot.rb, line 95 95: def set_defaults 96: init_with( 97: :show_data_values => true, 98: :show_data_points => true, 99: :area_fill => false, 100: :stacked => false 101: ) 102: self.top_align = self.right_align = self.top_font = self.right_font = 1 103: end
# File SVG/Graph/Plot.rb, line 164 164: def calculate_left_margin 165: super 166: label_left = get_x_labels[0].to_s.length / 2 * font_size * 0.6 167: @border_left = label_left if label_left > @border_left 168: end
# File SVG/Graph/Plot.rb, line 170 170: def calculate_right_margin 171: super 172: label_right = get_x_labels[-1].to_s.length / 2 * font_size * 0.6 173: @border_right = label_right if label_right > @border_right 174: end
# File SVG/Graph/Plot.rb, line 252 252: def draw_data 253: line = 1 254: 255: x_min, x_max, x_div = x_range 256: y_min, y_max, y_div = y_range 257: x_step = (@graph_width.to_f - font_size*2) / (x_max-x_min) 258: y_step = (@graph_height.to_f - font_size*2) / (y_max-y_min) 259: 260: for data in @data 261: x_points = data[:data][X] 262: y_points = data[:data][Y] 263: 264: lpath = "L" 265: x_start = 0 266: y_start = 0 267: x_points.each_index { |idx| 268: x = (x_points[idx] - x_min) * x_step 269: y = @graph_height - (y_points[idx] - y_min) * y_step 270: x_start, y_start = x,y if idx == 0 271: lpath << "#{x} #{y} " 272: } 273: 274: if area_fill 275: @graph.add_element( "path", { 276: "d" => "M#{x_start} #@graph_height #{lpath} V#@graph_height Z", 277: "class" => "fill#{line}" 278: }) 279: end 280: 281: @graph.add_element( "path", { 282: "d" => "M#{x_start} #{y_start} #{lpath}", 283: "class" => "line#{line}" 284: }) 285: 286: if show_data_points || show_data_values 287: x_points.each_index { |idx| 288: x = (x_points[idx] - x_min) * x_step 289: y = @graph_height - (y_points[idx] - y_min) * y_step 290: if show_data_points 291: @graph.add_element( "circle", { 292: "cx" => x.to_s, 293: "cy" => y.to_s, 294: "r" => "2.5", 295: "class" => "dataPoint#{line}" 296: }) 297: add_popup(x, y, format( x_points[idx], y_points[idx] )) if add_popups 298: end 299: make_datapoint_text( x, y-6, y_points[idx] ) if show_data_values 300: } 301: end 302: line += 1 303: end 304: end
# File SVG/Graph/Plot.rb, line 240 240: def field_height 241: values = get_y_values 242: max = @data.collect{|x| x[:data][Y].max }.max 243: if values.length == 1 244: dx = values[-1] 245: else 246: dx = (max - values[-1]).to_f / (values[-1] - values[-2]) 247: end 248: (@graph_height.to_f - font_size*2*top_font) / 249: (values.length + dx - top_align) 250: end
# File SVG/Graph/Plot.rb, line 205 205: def field_width 206: values = get_x_values 207: max = @data.collect{|x| x[:data][X][-1]}.max 208: dx = (max - values[-1]).to_f / (values[-1] - values[-2]) 209: (@graph_width.to_f - font_size*2*right_font) / 210: (values.length + dx - right_align) 211: end
# File SVG/Graph/Plot.rb, line 306 306: def format x, y 307: "(#{(x * 100).to_i / 100}, #{(y * 100).to_i / 100})" 308: end
# File SVG/Graph/Plot.rb, line 310 310: def get_css 311: return "/* default line styles */\n.line1{\n fill: none;\n stroke: #ff0000;\n stroke-width: 1px; \n}\n.line2{\n fill: none;\n stroke: #0000ff;\n stroke-width: 1px; \n}\n.line3{\n fill: none;\n stroke: #00ff00;\n stroke-width: 1px; \n}\n.line4{\n fill: none;\n stroke: #ffcc00;\n stroke-width: 1px; \n}\n.line5{\n fill: none;\n stroke: #00ccff;\n stroke-width: 1px; \n}\n.line6{\n fill: none;\n stroke: #ff00ff;\n stroke-width: 1px; \n}\n.line7{\n fill: none;\n stroke: #00ffff;\n stroke-width: 1px; \n}\n.line8{\n fill: none;\n stroke: #ffff00;\n stroke-width: 1px; \n}\n.line9{\n fill: none;\n stroke: #ccc6666;\n stroke-width: 1px; \n}\n.line10{\n fill: none;\n stroke: #663399;\n stroke-width: 1px; \n}\n.line11{\n fill: none;\n stroke: #339900;\n stroke-width: 1px; \n}\n.line12{\n fill: none;\n stroke: #9966FF;\n stroke-width: 1px; \n}\n/* default fill styles */\n.fill1{\n fill: #cc0000;\n fill-opacity: 0.2;\n stroke: none;\n}\n.fill2{\n fill: #0000cc;\n fill-opacity: 0.2;\n stroke: none;\n}\n.fill3{\n fill: #00cc00;\n fill-opacity: 0.2;\n stroke: none;\n}\n.fill4{\n fill: #ffcc00;\n fill-opacity: 0.2;\n stroke: none;\n}\n.fill5{\n fill: #00ccff;\n fill-opacity: 0.2;\n stroke: none;\n}\n.fill6{\n fill: #ff00ff;\n fill-opacity: 0.2;\n stroke: none;\n}\n.fill7{\n fill: #00ffff;\n fill-opacity: 0.2;\n stroke: none;\n}\n.fill8{\n fill: #ffff00;\n fill-opacity: 0.2;\n stroke: none;\n}\n.fill9{\n fill: #cc6666;\n fill-opacity: 0.2;\n stroke: none;\n}\n.fill10{\n fill: #663399;\n fill-opacity: 0.2;\n stroke: none;\n}\n.fill11{\n fill: #339900;\n fill-opacity: 0.2;\n stroke: none;\n}\n.fill12{\n fill: #9966FF;\n fill-opacity: 0.2;\n stroke: none;\n}\n/* default line styles */\n.key1,.dataPoint1{\n fill: #ff0000;\n stroke: none;\n stroke-width: 1px; \n}\n.key2,.dataPoint2{\n fill: #0000ff;\n stroke: none;\n stroke-width: 1px; \n}\n.key3,.dataPoint3{\n fill: #00ff00;\n stroke: none;\n stroke-width: 1px; \n}\n.key4,.dataPoint4{\n fill: #ffcc00;\n stroke: none;\n stroke-width: 1px; \n}\n.key5,.dataPoint5{\n fill: #00ccff;\n stroke: none;\n stroke-width: 1px; \n}\n.key6,.dataPoint6{\n fill: #ff00ff;\n stroke: none;\n stroke-width: 1px; \n}\n.key7,.dataPoint7{\n fill: #00ffff;\n stroke: none;\n stroke-width: 1px; \n}\n.key8,.dataPoint8{\n fill: #ffff00;\n stroke: none;\n stroke-width: 1px; \n}\n.key9,.dataPoint9{\n fill: #cc6666;\n stroke: none;\n stroke-width: 1px; \n}\n.key10,.dataPoint10{\n fill: #663399;\n stroke: none;\n stroke-width: 1px; \n}\n.key11,.dataPoint11{\n fill: #339900;\n stroke: none;\n stroke-width: 1px; \n}\n.key12,.dataPoint12{\n fill: #9966FF;\n stroke: none;\n stroke-width: 1px; \n}\n" 312: end
# File SVG/Graph/Plot.rb, line 197 197: def get_x_values 198: min_value, max_value, scale_division = x_range 199: rv = [] 200: min_value.step( max_value, scale_division ) {|v| rv << v} 201: return rv 202: end
# File SVG/Graph/Plot.rb, line 232 232: def get_y_values 233: min_value, max_value, scale_division = y_range 234: rv = [] 235: min_value.step( max_value, scale_division ) {|v| rv << v} 236: return rv 237: end
# File SVG/Graph/Plot.rb, line 179 179: def x_range 180: max_value = @data.collect{|x| x[:data][X][-1] }.max 181: min_value = @data.collect{|x| x[:data][X][0] }.min 182: min_value = min_value<min_x_value ? min_value : min_x_value if min_x_value 183: 184: range = max_value - min_value 185: right_pad = range == 0 ? 10 : range / 20.0 186: scale_range = (max_value + right_pad) - min_value 187: 188: scale_division = scale_x_divisions || (scale_range / 10.0) 189: 190: if scale_x_integers 191: scale_division = scale_division < 1 ? 1 : scale_division.round 192: end 193: 194: [min_value, max_value, scale_division] 195: end
# File SVG/Graph/Plot.rb, line 214 214: def y_range 215: max_value = @data.collect{|x| x[:data][Y].max }.max 216: min_value = @data.collect{|x| x[:data][Y].min }.min 217: min_value = min_value<min_y_value ? min_value : min_y_value if min_y_value 218: 219: range = max_value - min_value 220: top_pad = range == 0 ? 10 : range / 20.0 221: scale_range = (max_value + top_pad) - min_value 222: 223: scale_division = scale_y_divisions || (scale_range / 10.0) 224: 225: if scale_y_integers 226: scale_division = scale_division < 1 ? 1 : scale_division.round 227: end 228: 229: return [min_value, max_value, scale_division] 230: end