1SVG::TT::Graph::Pie(3)User Contributed Perl DocumentationSVG::TT::Graph::Pie(3)
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NAME

6       SVG::TT::Graph::Pie - Create presentation quality SVG pie graphs easily
7

SYNOPSIS

9         use SVG::TT::Graph::Pie;
10
11         my @fields = qw(Jan Feb Mar);
12         my @data_sales_02 = qw(12 45 21);
13
14         my $graph = SVG::TT::Graph::Pie->new({
15           'height' => '500',
16           'width'  => '300',
17           'fields' => \@fields,
18         });
19
20         $graph->add_data({
21           'data'  => \@data_sales_02,
22           'title' => 'Sales 2002',
23         });
24
25         print "Content-type: image/svg+xml\n\n";
26         print $graph->burn();
27

DESCRIPTION

29       This object aims to allow you to easily create high quality SVG pie
30       graphs. You can either use the default style sheet or supply your own.
31       Either way there are many options which can be configured to give you
32       control over how the graph is generated - with or without a key,
33       display percent on pie chart, title, subtitle etc.
34

METHODS

36   new()
37         use SVG::TT::Graph::Pie;
38
39         # Field names along the X axis
40         my @fields = qw(Jan Feb Mar);
41
42         my $graph = SVG::TT::Graph::Pie->new({
43           # Required
44           'fields'                  => \@fields,
45
46           # Optional - defaults shown
47           'height'                  => '500',
48           'width'                   => '300',
49
50           'show_graph_title'        => 0,
51           'graph_title'             => 'Graph Title',
52           'show_graph_subtitle'     => 0,
53           'graph_subtitle'          => 'Graph Sub Title',
54
55           'show_shadow'             => 1,
56           'shadow_size'             => 1,
57           'shadow_offset'           => 15,
58
59           'key_placement'           => 'R',
60
61           # data by pie chart wedges:
62           'show_data_labels'        => 0,
63           'show_actual_values'      => 0,
64           'show_percent'            => 1,
65           'rollover_values'         => 0,
66           'show_path_title'         => 0,
67           'show_title_fields'       => 0,
68
69           # data on key:
70           'show_key_data_labels'    => 1,
71           'show_key_actual_values'  => 1,
72           'show_key_percent'        => 0,
73
74           'expanded'                => 0,
75           'expand_greatest'         => 0,
76
77           # Stylesheet defaults
78           'style_sheet'             => '/includes/graph.css', # internal stylesheet
79           'style_sheet_field_names' => 0,
80           'random_colors'           => 0,
81
82         });
83
84       The constructor takes a hash reference, fields (the name for each slice
85       on the pie) MUST be set, all other values are defaulted to those shown
86       above - with the exception of style_sheet which defaults to using the
87       internal style sheet.
88
89   add_data()
90         my @data_sales_02 = qw(12 45 21);
91
92         $graph->add_data({
93           'data' => \@data_sales_02,
94           'title' => 'Sales 2002',
95         });
96
97       This method allows you to add data to the graph object, only the first
98       data set added will be used!
99
100   clear_data()
101         my $graph->clear_data();
102
103       This method removes all data from the object so that you can reuse it
104       to create a new graph but with the same config options.
105
106   burn()
107         print $graph->burn();
108
109       This method processes the template with the data and config which has
110       been set and returns the resulting SVG.
111
112       This method will croak unless at least one data set has been added to
113       the graph object.
114
115   config methods
116         my $value = $graph->method();
117         my $confirmed_new_value = $graph->method($value);
118
119       The following is a list of the methods which are available to change
120       the config of the graph object after it has been created.
121
122       height()
123           Set the height of the graph box, this is the total height of the
124           SVG box created - not the graph it self which auto scales to fix
125           the space.
126
127       width()
128           Set the width of the graph box, this is the total width of the SVG
129           box created - not the graph it self which auto scales to fix the
130           space.
131
132       compress()
133           Whether or not to compress the content of the SVG file
134           (Compress::Zlib required).
135
136       tidy()
137           Whether or not to tidy the content of the SVG file (XML::Tidy
138           required).
139
140       style_sheet()
141           Set the path to an external stylesheet, set to '' if you want to
142           revert back to using the defaut internal version.
143
144           Set to "inline:<style>...</style>" with your CSS in between the
145           tags.  You can thus override the default style without requireing
146           an external URL.
147
148           The default stylesheet handles up to 12 data sets. All data series
149           over the 12th will have no style and be in black. If you have over
150           12 data sets you can assign them all random colors (see the
151           random_color() method) or create your own stylesheet and add the
152           additional settings for the extra data sets.
153
154           To create an external stylesheet create a graph using the default
155           internal version and copy the stylesheet section to an external
156           file and edit from there.
157
158       random_colors()
159           Use random colors in the internal stylesheet
160
161       style_sheet_field_names()
162           If you use the style_sheet_field_names() option then you can use
163           the field names within your stylesheet. This allows consistent use
164           of styles. The names should be:
165
166           <field>_dataPoint
167           <field>_key
168       show_graph_title()
169           Whether to show a title on the graph, default is '0'.
170
171       graph_title()
172           What the title on the graph should be.
173
174       show_graph_subtitle()
175           Whether to show a subtitle on the graph, default is '0'.
176
177       graph_subtitle()
178           What the subtitle on the graph should be.
179
180       show_shadow()
181           Turn the shadow on and off, default to '1', set to '0' if you don't
182           want it. It is automatically turned off if you extract one section
183           of the pie.
184
185       shadow_size()
186           Size of the shadow if shown, measured as percentage of pie chart
187           radius, default of 1 being the same size as the pie.
188
189       shadow_offset()
190           Offset (in pixels) of shadow to bottom-right in relation to the
191           center of the pie chart.
192
193       key()
194           Whether to show a key, defaults to 0, set to '1' if you want to
195           show it.
196
197       key_placement()
198           Defaults to 'R' - right, can be 'R', 'L', 'T' or 'B'.
199
200       show_data_labels()
201           Show label on pie chart, defaults to '0', can be set to '1'.
202
203       show_actual_values()
204           Show values on pie chart, defaults to '0', can be set to '1'.
205
206       show_percent()
207           Show percent (rounded) on the pie chart, defaults to '1', can be
208           set to '0'.
209
210       rollover_values()
211           Shows data field and value when the mouse is over a piechart wedge.
212
213       show_path_title()
214           Whether to add the title attribute to the data path tags, which
215           will show "tooltips" when hovering over the bar area.
216
217       show_title_fields()
218           Whether to show field values as title elements in path tag,
219           defaults to 0, set to '1' to turn on. Suggest on single add_data
220           graphs, for overlapping graphs leave off to see the title value
221           used in the add_data call.
222
223       show_key_data_labels()
224           Show label on the key, defaults to '1', can be set to '0'.
225
226       show_key_actual_values()
227           Show value on the key, defaults to '1', can be set to '0'.
228
229       show_key_percent()
230           Show percent (rounded) on the key, defaults to '0', can be set to
231           '1'.
232
233       expanded()
234           All slices of pie are exploded out, defaults to '0'. Do not set to
235           '1' if you are going to use expanded_greatest().
236
237       expand_greatest()
238           The largest slice of pie is exploded out from the pie, defaults to
239           '0'. Useful if you are only showing the percentages (which are
240           rounded) but still want to visually show which slice was largest.
241
242           Do not set to '1' if you are going to use expanded().
243

EXAMPLES

245       For examples look at the project home page
246       http://leo.cuckoo.org/projects/SVG-TT-Graph/
247

EXPORT

249       None by default.
250

SEE ALSO

252       SVG::TT::Graph, SVG::TT::Graph::Line, SVG::TT::Graph::Bar,
253       SVG::TT::Graph::BarHorizontal, SVG::TT::Graph::BarLine,
254       SVG::TT::Graph::TimeSeries, SVG::TT::Graph::XY, Compress::Zlib,
255       XML::Tidy
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259perl v5.30.0                      2019-07-26            SVG::TT::Graph::Pie(3)
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