Template:Location map many/doc

Template:Location map many creates a location map as a composite image of an existing map, with multiple markers and optional labels superimposed onto it. This template functions in the style of Template:Location_map, but allows multiple markers and labels (rather than just one marker).

For an unlimited list of markers/labels, see: Template:Location map+, which specifies points as a coded template list of markers/labels.

Usage
The first unnamed parameter (shown as below) specifies a map definition. If is Spain, the map image and coordinates are based on the values defined for Spain in Module:Location map/data/Spain if it exists, or in Template:Location map Spain otherwise.

Parameters
Note: For brevity, parameters "pos" & "bg" are aliases (for "position" & "background"), with pos2, bg2, pos3, bg3, etc.

Markers
When a marker's mark # size=0, then that marker is skipped and only the related label is displayed, without the marker.

Each mark, mark2, mark3 (etc.) can be another image-symbol, such as Diamond_sheer_red_20.gif (marksize=20) to show a red diamond on the image: or use: Cercle_rouge_100%.svg to show a red circle  or a larger black diamond: Diamond_sheer_black_37.gif as sized with a larger marksize=37 or similar number to resize the diamond somewhat:
 * See Wikimedia pointer symbols: commons:Category:Map pointers.

Advisory messages
The degrees of latitude/longitude are validated, to show error messages, but location minutes can be set very large to place markers outside the map (with no warnings). Due to the numerous details of specifying multiple markers/labels, the latitude and longitude are checked to lie within the actual map limits specified in Template:Location_map_ . Each marker/label is checked and can list a warning message (under the map), such as:
 * Latitude#4 (45.68) < map min(53.74).

Processing continues, with that marker actually placed off-map, and all latitude/longitude parameters are checked. Only degrees of latitude/longitude are checked, so a value of 63 minutes would be valid to indicate 1 extra degree + 3 minutes, and setting lon_min=200 could still place a marker off-map (right-side) with no warning message. Also, large markers or long labels can spill over the edges of a map, allowing markers to point inward from outside the map. In such cases, a map could be centered by itself on the page ("float=center") to avoid overlapping the edge markers onto any surrounding article text.

Available maps
Location maps can be found using these sources:


 * Special:PrefixIndex/Module:Location map/data/ - Checked before a map template is searched for. New maps should be created here rather than creating new templates.
 * List of templates - 1050 templates available when the list was generated.
 * Category:Location map templates - templates sorted by category.
 * Special:WhatLinksHere/Template:Location map/Info - a search that might help.
 * Special:Prefixindex/Template:Location_map_ - another search that might help.

Creating new map definitions
See Creating a new map definition.

Implementation notes
The map with markers/labels is implemented as nested HTML divisions. The map-image is in an HTML division, containing each point as a percent-locator division containing a marker-image sub-division plus a label sub-division. Each point is calculated (for a percent-locator division) with X or Y coordinate "XX.X%" or "YY.Y%" as follows:


 * The div-tag is "&lt;div style="position: absolute; z-index: 2; top: XX.X%; left: YY.Y%; ...&gt;"
 * For placing latitude, the calculation is:
 * XX.X% = 100 * (top - (lat_deg + latmin/60 +latsec/3600) ) / (top - bottom)
 * If lat_deg is empty, the combined decimal latitude is used from "lat".
 * If lat_dir is "S" (south), the latitude is multiplied by -1.
 * (Note latitude is positioned in reverse, from top of map downward.)


 * For placing longitude, the calculation is:
 * YY.Y% = 100 * ( (lon_deg + lonmin/60 +lonsec/3600) - left ) / (right - left)
 * If lon_deg is empty, the combined decimal longitude is used as "long".
 * If lon_dir is "W" (west), the longitude is multiplied by -1.


 * The div-tag is ended as "height: 0; width: 0; margin: 0; padding: 0;"&gt;".
 * Within that division the marker/label sub-divisions are coded as:
 * &lt;div style="position: relative text-align: center; ..."&gt;.


 * For label position, the options are shifted as:
 * when position=left, adds "left: -6.5em; text-align: right;"
 * when position=right, adds "left: 0.5em; text-align: left;"
 * when position=top, adds "top:-2.65em; left:-3em; text-align: center;"
 * when position=bottom, adds "top:-0.15em; left: -3em; text-align: center;" to div-tag.