1SVG::TT::Graph::BarLineU(s3e)r Contributed Perl DocumentaStViGo:n:TT::Graph::BarLine(3)
2
6 SVG::TT::Graph::BarLine - Create presentation quality SVG bar-line
7 graphs easily
8
10 use SVG::TT::Graph::BarLine;
11 my @fields = qw(Jan Feb Mar);
13 my @data_sales_02 = qw(12 45 21);
14 my @data_sales_03 = (24, 55, 61);
15 my $graph = SVG::TT::Graph::BarLine->new({
17 'height' => '500',
18 'width' => '300',
19 'fields' => \@fields,
20 });
21 $graph->add_data({
23 'data' => \@data_sales_02,
24 'title' => 'Sales 2002',
25 });
26 $graph->add_data({
28 'data' => \@data_sales_03,
29 'title' => 'Sales 2003',
30 });
31 print "Content-type: image/svg+xml\n\n";
33 print $graph->burn();
34
36 This object aims to allow you to easily create high quality SVG bar
37 graphs. You can either use the default style sheet or supply your own.
38 Either way there are many options which can be configured to give you
39 control over how the graph is generated - with or without a key, data
40 elements at each point, title, subtitle etc.
41
43 new()
44 use SVG::TT::Graph::BarLine;
45 # Field names along the X axis
47 my @fields = qw(Jan Feb Mar);
48 my $graph = SVG::TT::Graph::BarLine->new({
50 # Required
51 'fields' => \@fields,
52 # Optional - defaults shown
54 'height' => '500',
55 'width' => '300',
56 'show_data_values' => 1,
58 'scale_divisions' => '',
60 'min_scale_value' => '0',
61 'bar_gap' => 1,
62 'show_x_labels' => 1,
64 'stagger_x_labels' => 0,
65 'rotate_x_labels' => 0,
66 'show_y_labels' => 1,
67 'scale_integers' => 0,
68 'show_secondary_y_labels' => 1,
69 'y_label_formatter' => sub { return @_ },
70 'x_label_formatter' => sub { return @_ },
71 'show_path_title' => 0,
73 'show_title_fields' => 0,
74 'show_x_title' => 0,
76 'x_title' => 'X Field names',
77 'show_y_title' => 0,
79 'show_secondary_y_title' => 0,
80 'y_title_text_direction' => 'bt',
81 'secondary_y_title_text_direction' => 'bt',
82 'y_title' => 'Y Scale',
83 'secondary_y_title' => 'Y Scale 2',
84 'show_graph_title' => 0,
86 'graph_title' => 'Graph Title',
87 'show_graph_subtitle' => 0,
88 'graph_subtitle' => 'Graph Sub Title',
89 'key' => 0,
91 'key_position' => 'right',
92 # Stylesheet defaults
94 'style_sheet' => '/includes/graph.css', # internal stylesheet
95 'random_colors' => 0,
96 });
97 The constructor takes a hash reference, fields (the names for each
99 field on the X axis) MUST be set, all other values are defaulted to
100 those shown above - with the exception of style_sheet which defaults to
101 using the internal style sheet.
102 add_data()
104 my @data_sales_02 = qw(12 45 21);
105 $graph->add_data({
107 'data' => \@data_sales_02,
108 'title' => 'Sales 2002',
109 });
110 This method allows you to add data to the graph object. It can be
112 called several times to add more data sets in, but the likelihood is
113 you should be using SVG::TT::Graph::Line as it won't look great!
114 clear_data()
116 my $graph->clear_data();
117 This method removes all data from the object so that you can reuse it
119 to create a new graph but with the same config options.
120 burn()
122 print $graph->burn();
123 This method processes the template with the data and config which has
125 been set and returns the resulting SVG.
126 This method will croak unless at least one data set has been added to
128 the graph object.
129 config methods
131 my $value = $graph->method();
132 my $confirmed_new_value = $graph->method($value);
133 The following is a list of the methods which are available to change
135 the config of the graph object after it has been created.
136 height()
138 Set the height of the graph box, this is the total height of the
139 SVG box created - not the graph it self which auto scales to fix
140 the space.
141 width()
143 Set the width of the graph box, this is the total width of the SVG
144 box created - not the graph it self which auto scales to fix the
145 space.
146 compress()
148 Whether or not to compress the content of the SVG file
149 (Compress::Zlib required).
150 tidy()
152 Whether or not to tidy the content of the SVG file (XML::Tidy
153 required).
154 style_sheet()
156 Set the path to an external stylesheet, set to '' if you want to
157 revert back to using the defaut internal version.
158 Set to "inline:<style>...</style>" with your CSS in between the
160 tags. You can thus override the default style without requireing
161 an external URL.
162 The default stylesheet handles up to 12 data sets. All data series
164 over the 12th will have no style and be in black. If you have over
165 12 data sets you can assign them all random colors (see the
166 random_color() method) or create your own stylesheet and add the
167 additional settings for the extra data sets.
168 To create an external stylesheet create a graph using the default
170 internal version and copy the stylesheet section to an external
171 file and edit from there.
172 random_colors()
174 Use random colors in the internal stylesheet
175 show_data_values()
177 Show the value of each element of data on the graph
178 bar_gap()
180 Whether to have a gap between the bars or not, default is '1', set
181 to '0' if you don't want gaps.
182 show_x_labels()
184 Whether to show labels on the X axis or not, defaults to 1, set to
185 '0' if you want to turn them off.
186 stagger_x_labels()
188 This puts the labels at alternative levels so if they are long
189 field names they will not overlap so easily. Default it '0', to
190 turn on set to '1'.
191 rotate_x_labels()
193 This turns the X axis labels by 90 degrees. Default it '0', to
194 turn on set to '1'.
195 show_y_labels()
197 Whether to show labels on the Y axis or not, defaults to 1, set to
198 '0' if you want to turn them off.
199 scale_integers()
201 Ensures only whole numbers are used as the scale divisions.
202 Default it '0', to turn on set to '1'. This has no effect if scale
203 divisions are less than 1.
204 show_secondary_y_labels()
206 Whether to show labels on the right hand side Y axis or not,
207 defaults to 1, set to '0' if you want to turn them off.
208 min_scale_value()
210 The point at which the Y axis starts, defaults to '0', if set to ''
211 it will default to the minimum data value.
212 scale_divisions()
214 This defines the gap between markers on the Y axis, default is a
215 10th of the max_value, e.g. you will have 10 markers on the Y axis.
216 NOTE: do not set this too low - you are limited to 999 markers,
217 after that the graph won't generate.
218 show_x_title()
220 Whether to show the title under the X axis labels, default is 0,
221 set to '1' to show.
222 x_title()
224 What the title under X axis should be, e.g. 'Months'.
225 show_y_title()
227 Whether to show the title on the left hand side Y axis, default is
228 0, set to '1' to show.
229 show_secondary_y_title()
231 Whether to show the title on the right hand side Y axis, default is
232 0, set to '1' to show.
233 y_title_text_direction()
235 Aligns writing mode for Y axis label. Defaults to 'bt' (Bottom to
236 Top). Change to 'tb' (Top to Bottom) to reverse.
237 secondary_y_title_text_direction()
239 Aligns writing mode for right hand Y axis label. Defaults to 'bt'
240 (Bottom to Top). Change to 'tb' (Top to Bottom) to reverse.
241 y_title()
243 What the title under Y axis should be, e.g. 'Sales in thousands'.
244 secondary_y_title()
246 What the title on the right hand side Y axis should be, e.g.
247 'Number of deals'.
248 show_graph_title()
250 Whether to show a title on the graph, defaults to 0, set to '1' to
251 show.
252 graph_title()
254 What the title on the graph should be.
255 show_graph_subtitle()
257 Whether to show a subtitle on the graph, defaults to 0, set to '1'
258 to show.
259 graph_subtitle()
261 What the subtitle on the graph should be.
262 key()
264 Whether to show a key, defaults to 0, set to '1' if you want to
265 show it.
266 key_position()
268 Where the key should be positioned, defaults to 'right', set to
269 'bottom' if you want to move it.
270 x_label_formatter ()
272 A callback subroutine which will format a label on the x axis. For
273 example:
274 $graph->x_label_formatter( sub { return '$' . $_[0] } );
276 y_label_formatter()
278 A callback subroutine which will format a label on the y axis. For
279 example:
280 $graph->y_label_formatter( sub { return '$' . $_[0] } );
282 show_path_title()
284 Whether to add the title attribute to the data path tags, which
285 will show "tooltips" when hovering over the bar area.
286 show_title_fields()
288 Whether to show field values as title elements in path tag,
289 defaults to 0, set to '1' to turn on. Suggest on single add_data
290 graphs, for overlapping graphs leave off to see the title value
291 used in the add_data call.
292
294 For examples look at the project home page
295 http://leo.cuckoo.org/projects/SVG-TT-Graph/
296
298 None by default.
299
301 SVG::TT::Graph, SVG::TT::Graph::Line, SVG::TT::Graph::Bar,
302 SVG::TT::Graph::BarHorizontal, SVG::TT::Graph::Pie,
303 SVG::TT::Graph::TimeSeries, SVG::TT::Graph::XY, Compress::Zlib,
304 XML::Tidy
305perl v5.32.0 2020-07-28 SVG::TT::Graph::BarLine(3)