1SVG::TT::Graph::XY(3) User Contributed Perl DocumentationSVG::TT::Graph::XY(3)
2
6 SVG::TT::Graph::XY - Create presentation quality SVG line graphs of XY
7 data points easily
8
10 use SVG::TT::Graph::XY;
11 my @data_cpu = (0.3, 23, 0.5, 54, 1.0, 67, 1.8, 12);
13 my @data_disk = (0.45, 12, 0.51, 26, 0.53, 23);
14 my $graph = SVG::TT::Graph::XY->new({
16 'height' => '500',
17 'width' => '300',
18 });
19 $graph->add_data({
21 'data' => \@data_cpu,
22 'title' => 'CPU',
23 });
24 $graph->add_data({
26 'data' => \@data_disk,
27 'title' => 'Disk',
28 });
29 print "Content-type: image/svg+xml\n\n";
31 print $graph->burn();
32
34 This object aims to allow you to easily create high quality SVG line
35 graphs of XY data. You can either use the default style sheet or supply
36 your own. Either way there are many options which can be configured to
37 give you control over how the graph is generated - with or without a
38 key, data elements at each point, title, subtitle etc.
39
41 new()
42 use SVG::TT::Graph::XY;
43 my $graph = SVG::TT::Graph::XY->new({
45 # Optional - defaults shown
47 'height' => 500,
48 'width' => 300,
49 'show_y_labels' => 1,
51 'yscale_divisions' => '',
52 'min_yscale_value' => 0,
53 'max_yscale_value' => '',
54 'show_x_labels' => 1,
56 'xscale_divisions' => '',
57 'min_xscale_value' => '',
58 'max_xscale_value' => '',
59 'stagger_x_labels' => 0,
60 'rotate_x_labels' => 0,
61 'y_label_formatter' => sub { return @_ },
62 'x_label_formatter' => sub { return @_ },
63 'show_data_points' => 1,
65 'show_data_values' => 1,
66 'rollover_values' => 0,
67 'area_fill' => 0,
69 'show_x_title' => 0,
71 'x_title' => 'X Field names',
72 'show_y_title' => 0,
74 'y_title' => 'Y Scale',
75 'show_graph_title' => 0,
77 'graph_title' => 'Graph Title',
78 'show_graph_subtitle' => 0,
79 'graph_subtitle' => 'Graph Sub Title',
80 'key' => 0,
81 'key_position' => 'right',
82 # Stylesheet defaults
84 'style_sheet' => '/includes/graph.css', # internal stylesheet
85 'random_colors' => 0,
86 });
87 The constructor takes a hash reference with values defaulted to those
89 shown above - with the exception of style_sheet which defaults to using
90 the internal style sheet.
91 add_data()
93 my @data_cpu = (0.3, 23, 0.5, 54, 1.0, 67, 1.8, 12);
94 or
95 my @data_cpu = ([0.3,23], [0.5,54], [1.0,67], [1.8,12]);
96 or
97 my @data_cpu = ([0.3,23,'23%'], [0.5,54,'54%'], [1.0,67,'67%'], [1.8,12,'12%']);
98 $graph->add_data({
100 'data' => \@data_cpu,
101 'title' => 'CPU',
102 });
103 This method allows you to add data to the graph object. The data are
105 expected to be either a list of scalars (in which case pairs of
106 elements are taken to be X,Y pairs) or a list of array references. In
107 the latter case, the first two elements in each referenced array are
108 taken to be X and Y, and the optional third element (if present) is
109 used as the text to display for that point for show_data_values and
110 rollover_values; otherwise the Y value itself is displayed. It can be
111 called several times to add more data sets in.
112 clear_data()
114 my $graph->clear_data();
115 This method removes all data from the object so that you can reuse it
117 to create a new graph but with the same config options.
118 burn()
120 print $graph->burn();
121 This method processes the template with the data and config which has
123 been set and returns the resulting SVG.
124 This method will croak unless at least one data set has been added to
126 the graph object.
127 config methods
129 my $value = $graph->method();
130 my $confirmed_new_value = $graph->method($value);
131 The following is a list of the methods which are available to change
133 the config of the graph object after it has been created.
134 height()
136 Set the height of the graph box, this is the total height of the
137 SVG box created - not the graph it self which auto scales to fix
138 the space.
139 width()
141 Set the width of the graph box, this is the total width of the SVG
142 box created - not the graph it self which auto scales to fix the
143 space.
144 compress()
146 Whether or not to compress the content of the SVG file
147 (Compress::Zlib required).
148 tidy()
150 Whether or not to tidy the content of the SVG file (XML::Tidy
151 required).
152 style_sheet()
154 Set the path to an external stylesheet, set to '' if you want to
155 revert back to using the default internal version.
156 The default stylesheet handles up to 12 data sets. All data series
158 over the 12th will have no style and be in black. If you have over
159 12 data sets you can assign them all random colors (see the
160 random_color() method) or create your own stylesheet and add the
161 additional settings for the extra data sets.
162 To create an external stylesheet create a graph using the default
164 internal version and copy the stylesheet section to an external
165 file and edit from there.
166 random_colors()
168 Use random colors in the internal stylesheet.
169 show_data_values()
171 Show the value of each element of data on the graph (or optionally
172 a user-defined label; see add_data).
173 show_data_points()
175 Show a small circle on the graph where the line goes from one point
176 to the next.
177 rollover_values()
179 Shows data values and data points when the mouse is over the point.
180 Used in combination with show_data_values and/or show_data_points.
181 data_value_format()
183 Format specifier to for data values (as per printf).
184 max_x_span()
186 Maximum span for a line between data points on the X-axis. If this
187 span is exceeded, the points are not connected. This is useful for
188 skipping missing data sections. If you set this value to something
189 smaller than 0 (e.g. -1), you will get an XY scatter plot with no
190 line joining the data points.
191 stacked()
193 Accumulates each data set. (i.e. Each point increased by sum of all
194 previous series at same point). Default is 0, set to '1' to show.
195 min_yscale_value()
197 The point at which the Y axis starts, defaults to '0', if set to ''
198 it will default to the minimum data value.
199 max_yscale_value()
201 The point at which the Y axis ends, if set to '' it will default to
202 the maximum data value.
203 yscale_divisions()
205 This defines the gap between markers on the Y axis, default is a
206 10th of the range, e.g. you will have 10 markers on the Y axis.
207 NOTE: do not set this too low - you are limited to 999 markers,
208 after that the graph won't generate.
209 show_x_labels()
211 Whether to show labels on the X axis or not, defaults to 1, set to
212 '0' if you want to turn them off.
213 show_y_labels()
215 Whether to show labels on the Y axis or not, defaults to 1, set to
216 '0' if you want to turn them off.
217 y_label_format()
219 Format string for presenting the Y axis labels (as per printf).
220 xscale_divisions()
222 This defines the gap between markers on the X axis. Default is the
223 entire range (only start and end axis labels).
224 stagger_x_labels()
226 This puts the labels at alternative levels so if they are long
227 field names they will not overlap so easily. Default it '0', to
228 turn on set to '1'.
229 rotate_x_labels()
231 This turns the X axis labels by 90 degrees. Default it '0', to
232 turn on set to '1'.
233 min_xscale_value()
235 This sets the minimum X value. Any data points before this value
236 will not be shown.
237 max_xscale_value()
239 This sets the maximum X value. Any data points after this value
240 will not be shown.
241 show_x_title()
243 Whether to show the title under the X axis labels, default is 0,
244 set to '1' to show.
245 x_title()
247 What the title under X axis should be, e.g. 'Parameter X'.
248 show_y_title()
250 Whether to show the title under the Y axis labels, default is 0,
251 set to '1' to show.
252 y_title()
254 What the title under Y axis should be, e.g. 'Sales in thousands'.
255 show_graph_title()
257 Whether to show a title on the graph, default is 0, set to '1' to
258 show.
259 graph_title()
261 What the title on the graph should be.
262 show_graph_subtitle()
264 Whether to show a subtitle on the graph, default is 0, set to '1'
265 to show.
266 graph_subtitle()
268 What the subtitle on the graph should be.
269 key()
271 Whether to show a key, defaults to 0, set to '1' if you want to
272 show it.
273 key_position()
275 Where the key should be positioned, defaults to 'right', set to
276 'bottom' if you want to move it.
277 x_label_formatter ()
279 A callback subroutine which will format a label on the x axis. For
280 example:
281 $graph->x_label_formatter( sub { return '$' . $_[0] } );
283 y_label_formatter()
285 A callback subroutine which will format a label on the y axis. For
286 example:
287 $graph->y_label_formatter( sub { return '$' . $_[0] } );
289
291 For examples look at the project home page
292 http://leo.cuckoo.org/projects/SVG-TT-Graph/
293
295 None by default.
296
298 SVG::TT::Graph, SVG::TT::Graph::Line, SVG::TT::Graph::Bar,
299 SVG::TT::Graph::BarHorizontal, SVG::TT::Graph::BarLine,
300 SVG::TT::Graph::Pie, Compress::Zlib, XML::Tidy
301perl v5.28.1 2014-09-22 SVG::TT::Graph::XY(3)