Template:NPVIC chart

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This template creates a "stacked" timeline chart for the article National Popular Vote Interstate Compact, showing the contributions over time of individual member states to the NPVIC electoral vote total. It allows annotations of key events.

Use

This template has several named parameters used to set up the chart, and uses unnamed parameters to pass data (in {{item}} frames) to the sub-template {{NPVIC chart/bar}}, which creates the contents of the chart.

Chart parameters

Parameter group	Parameter	Purpose	Default value
Current status (mandatory)	curr_tot	Total number of electoral votes (EVs) currently controlled by NPVIC member states	-
	updated	Date of last update to the chart, in MM/DD/YYYY format	-
Bar segments (as many as needed)	[unnamed]	Defines an individual bar segment in the chart, using the {{item}} template (See bar segment syntax below)	-
Display parameters (optional)	width	Width of the displayed table, in pixels	750
	height	Height of the displayed table, in pixels (also determines font sizes)	450
	max_tot	Maximum number of EVs ever controlled by NPVIC member states (Controls scale of vertical axis; use when EV total has decreased)	{{{curr_tot}}}
	vert-interval	Interval of the vertical axis, in EVs	25
	year-interval	Interval of the horizontal axis, in years	1
Annotations (optional, up to five)	note-date[n]	Date of event	-
	note-text[n]	Annotation text	-

1.^ The template currently supports up to 50 bar segments. If more are needed, the template must be edited to make additional calls to {{NPVIC chart/bar}}.

2.^ Census events are automatically annotated and do not count towards the limit

Example

{{NPVIC chart
| curr_tot = 165 | updated = 9/17/2017			<!--Mandatory parameters-->
| size = 500 | max_tot = 165 | vert-interval = 25 | year-interval = 1		<!--Optional display parameters-->
| note-date1 = 1/3/2006 | note-text1 = First<br/>legislative<br/>introduction   <!--An annotation-->
| {{item | ... }}								<!--First bar segment (see syntax below) -->
| {{item | ... }}								<!--Second bar segment (see syntax below) -->
| ...
}}

Bar segment syntax

A bar segment represents a portion of the history of a particular state's participation in the compact, between two events at which the EV total changed:

• The start event may be when the state joined the compact, when a previously-joined state left or rejoined the compact, or at a congressional reapportionment
• The end event may be when the state left the compact, when a previously-joined state left or rejoined the compact, or at a congressional reapportionment

Most states will require multiple segments to span their history in the compact, if intervening events change the EV total. States which leave the compact must continue to be included, with an EV value of zero.

Each bar segment is created with a single unnamed argument, containing a call to the template {{item}} with the parameters outlined below.

Parameter group	Parameter	Purpose	Sample value	Notes
State	1	State (two letter abbreviation)	MD	MANDATORY: May be empty, but must be present
Electoral votes	2	Number of EVs controlled by the state	10	MANDATORY
	3	New total EVs of member states listed to this point	10	MANDATORY
	old_tot	Previous total EVs of member states listed to this point	0	MANDATORY for start events other than the given state joining the compact. (Makes a continuous line over segments belonging to the same state)
Dates (start or end date may be inferred from a signle date parameter as described below.)	start	Start date of the segment (MM/DD/YYYY)	04/10/2007	At least one date parameter is needed; see below
	end	End date of the segment (MM/DD/YYYY)	01/01/2011
	census	Year of most recent census (YYYY)	2000
Label adjustments (optional)	x-offset	Position offsets of the state label, as a percent of the chart width	-1	Use to avoid overlapping labels
	y-offset		0.5

Sample bar segment

| {{item | MD | 10 | 10 | old_tot = 0 | start = 04/10/2007 | end = 01/01/2011 | census = 2000 | x-offset = -1 | y-offset = 0.5}}

(Note that the bar segment comprises a single argument to the parent template)

Date parameters

Bar segments require at least one of the three date parameters. If either the start date or end date is not given, the bar segment will start or end at the previous or the following reapportionment date, respectively. If neither date is specified, a census year must be specified instead, and the segment will span between subsequent reapportionments.

The start and end dates of the segment are set as follows:

Inputs given	Output
	segment starts at:	segment ends at:
"start" and "end"	specified start date	specified end date
"start", but not "end"	specified start date	date of the following reapportionment
"end", but not "start"	date of the previous reapportionment	specified end date
"census" only	date of reapportionment for the specified year	date of the following reapportionment

3.^ Reapportionment is considered to take place at the end of the census year.

Sub-templates

The following templates exist for use by this template, and should not be called outside this template.

• {{NPVIC chart/bar}} – creates a bar segment for a given state within a specified date range
• {{NPVIC chart/annotation}} – creates annotations of key events
• {{NPVIC chart/stripe}} – creates gray bars on alternating years
• {{NPVIC chart/x-axis}} – creates horizontal markers
• {{NPVIC chart/y-axis}} – creates vertical markers
• {{NPVIC chart/percent}} – utility template; calculates the horizontal position of a given date as a percentage of the graph's width

The above documentation is transcluded from Template:NPVIC chart/doc. (edit | history)
Editors can experiment in this template's sandbox (create | mirror) and testcases (create) pages.
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