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Module Chart exports two functions: bar chart and pie chart

Drawing Bar charts: "bar chart"

Parameters

parameter name what it does
delimiter string to delimit multiple values when given. default to colon ( : ). normally you do not want to touch this, it's provided for the off-chance you'll want to use colon as part of one of the parameters.
width number. if provided, must be at least 200. default: 500
height number. if provided, must be at least 200. default: 350
group n (where "n" is a number. use "group 1", "group 2" etc. for as many groups as there are in the graph) the values to be charted. see below.
tooltip n tooltip to be associated with specific bar. If no tooltip for a specific bar is defined, and this bar has a link, then this link will be used as tooltip. Otherwise, the tooltip will be combined from the group name and the value, optionally with "units prefix" and "units suffix".
links n links to articles to be associated with specific bar
stack whether to stack the different groups on top of each other. do not specify to show bars side by side.
colors the colors used to denote the various groups. should have exactly as many values as # of groups. can be given as standard html-recognized color names, or using #xxx or #xxxxxx notation.
x legends The legends for the X values. Wikicode, such as internal links or templates can be used.
scale per group set to 1 to use separate Y- scale for each group. leave empty to use one scale for all groups. incompatible with "stack". Note that even if some of the scales are exactly the same, they will be drawn separately when this setting is on.
units prefix used in tooltip. e.g., $, so values will show as "$500" instead of "500" in the tooltip
units suffix ditto for units suffix. use, e.g. "Kg" so values will show as 88Kg instead of 88 in tooltip. underscore ("_") are replaced by spaces, to allow a space between the value and the suffix.
group names names of different groups

many of the parameters are multi-valued, and are delimited with "delimiter"

some simple examples: 

{{ #invoke:Chart | bar chart
| group 1 = 40 : 50 : 60 : 20
| group 2 = 20 : 60 : 12 : 44
| group 3 = 55 : 14 : 33 : 5
| links 1 = Apple : McCintosh : Golden delicious
| links 2 = Banana : Apricot : Peach
| links 3 = Orange : Pear : Bear
| tooltip 2 = tooltip 1 : tooltip 2 : tooltip 3 : tooltip 4
| colors = green : yellow : orange
| group names = Apple : Banana : Orange
| x legends = Before : During : After : Post mortem
}}


tooltip 1
tooltip 2
tooltip 3
10
20
30
40
50
60
Before
During
After
Post mortem
  •   Apple
  •   Banana
  •   Orange


Here is the same graph, with more modest height and width, using "stack", and adding "units suffix" for good measure: 

{{ #invoke:Chart | bar chart
| height = 250
| width = 300
| stack = 1
| group 1 = 40 : 50 : 60 : 20
| group 2 = 20 : 60 : 12 : 44
| group 3 = 55 : 14 : 33 : 5
| colors = green : yellow : orange
| group names = Apple : Banana : Orange
| units suffix = Kg
| x legends = Before : During : After : Post mortem
}}
25
50
75
100
125
150
Before
During
After
Post mortem
  •   Apple
  •   Banana
  •   Orange


It is possible to show each of the groups using different scale and units: 

{{ #invoke:Chart | bar chart
| width = 800
| group 1 = 1500000 : 2500000 : 3500000
| group 2 = 200 : 5000 : 45000
| group 3 = 2000 : 5000 : 20000
| colors = red : blue : green
| group names = People : Cars : Average car cost
| x legends = 1920 : 1965 : 2002
| tooltip 2 = : There is no good data for number of cars in 1965. we use 5,000 as best estimate
| units prefix = : : $
| scale per group = 1
}}

Notice the "units prefix" field: we do not need prefix for the first 2 groups, so we use colons with no content. we could write "::$" instead of " : : $".

Also note the special tooltip for the "Cars" number for 1965.


1,000,000
2,000,000
3,000,000
4,000,000
10,000
20,000
30,000
40,000
50,000
5,000
10,000
15,000
20,000
1920
1965
2002
  •   People
  •   Cars
  •   Average car cost
{{ #invoke:Chart | bar chart
| width = 800
| group 1 = 1500000 : 2500000 : 3500000
| group 2 = 200 : 5000 : 45000
| group 3 = 2000 : 5000 : 20000
| colors = red : blue : green
| group names = People : Cars : Average car cost
| x legends = 1920 : 1965 : 2002
| tooltip 2 = : There is no good data for number of cars in 1965. we use 5,000 as best estimate
| units prefix = : : $
| scale per group = 1
}}

Notice the "units prefix" field: we do not need prefix for the first 2 groups, so we use colons with no content. we could write "::$" instead of " : : $".

Also note the special tooltip for the "Cars" number for 1965.


Here is an example with large number of groups - mainly to test how does it look with large number of legends.

25
50
75
100
125
150
1920
1930
1940
1950
1960
1970
1990
2000
2010
  •   Alabama
  •   Alaska
  •   Arizona
  •   Arkansas
  •   California
  •   Colorado
  •   Connecticut
  •   Delaware
  •   Florida
  •   Georgia
  •   Hawaii
  •   Idaho
  •   Illinois
  •   Indiana
  •   Iowa
  •   Kansas
  •   Kentucky
  •   Louisiana
  •   Maine
  •   Maryland
  •   Massachusetts


If there are many values, x legends can be diluted by using delimiters with nothing in between: 


{{ #invoke:Chart | bar chart
| group 1 = 1:2:3:4:5:6:7:8:9:10:11:12:13:14:15:16:17:18:19:20:21:22:23:24:25:26:27:28:29:30
:31:32:33:34:35:36:37:38:39:40:41:42:43:44:45:46:47:48:49:50:51:52:53:54:55:56:57:58:59
| units suffix = _Things
| group names = Some
| x legends = ::::1940::::::::::1950::::::::::1960::::::::::1970::::::::::1980::::::::::1990::::
}}
10
20
30
40
50
60
1940
1950
1960
1970
1980
1990



Drawing Pie charts: "pie chart"

Parameters

parameter name what it does
delimiter string to delimit multiple values when given. default to colon ( : ). normally you do not want to touch this, it's provided for the off-chance you'll want to use colon as part of one of the parameters.
radius number. The radius of the pie in pixels
slices Tupples, in parenthesis. Use delimiter inside the tupple: 
( Value1 : Name1 : Color1 : Link1  ) ( Value2 : Name2 : Color2 : Link2 ) ...

The values are numbers. The numbers can be integers or decimal fractions, or using the scientific notation: 7.24e6, 7,240,000, or 7240000.00 are all acceptable for 7 Million and 240 thousands.

Names are strings. Colors are optional. you can use any Web colors, such as "red" or "#FF0000". Up to 26 default colors are defined, but if your pie has more than 26 slices, you must define the colors of slice #27 and up. Links can be external or internal links

percent if used, the percentage of each slice will be calculated and added to the legend: so if you have two slices, like so: ( 1 : Younglings ) ( 3 : elders ), and use define "percent", the legends will become "Younglings: 1 (25%)" and "Elders: 3 (75%)", instead of simply "Younglings: 1" and "Elders: 3"
units prefix used in the legend. e.g., defining "units prefix=$", values will show as "$500" instead of "500" in the legends
units suffix ditto for units suffix. use, e.g. "Kg" so values will show as 88Kg instead of 88 in legend. underscore ("_") are replaced by spaces, to allow a space between the value and the suffix.

Examples

{{#invoke:Chart|pie chart
| radius = 200
| slices = ( 100 : Apples ) ( 200 : Bananas ) ( 144 : Apricots ) ( 60 : Pear )
| units suffix = _Kg
| percent = true
}}
Apples: 100 Kg (19.8%)Bananas: 200 Kg (39.7%)Apricots: 144 Kg (28.6%)Pear: 60 Kg (11.9%)
  •   Apples: 100 Kg (19.8%)
  •   Bananas: 200 Kg (39.7%)
  •   Apricots: 144 Kg (28.6%)
  •   Pear: 60 Kg (11.9%)
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