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Updated Discussion of a Legending Spec for Mapnik (markdown)

ThomasG77 2011-12-26 16:23:06 -08:00
parent 363d76ad66
commit 8159f83624
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Legending.md

@ -13,10 +13,7 @@ Should be configured with XML or a python class.
## XML
#!text/xml
```xml
<Legend>
<Title breakline=true stroke-width="1" stroke="black">Education</title>
<SubTitle> Level of Education Among Population Over Age 20</Subtitle>
@ -29,8 +26,9 @@ Should be configured with XML or a python class.
</Item>
....
</Legend>
## Python
```
## Python
# Feature Wishlist
@ -47,7 +45,7 @@ That would look something like:
Syntax might look like:
#!xml
```xml
<Item>
<Filter>[id] = 1</Filter>
<Symbolizer>
@ -57,13 +55,13 @@ Syntax might look like:
<Item use_feature="true">
<Symbolizer>
...
```
### Andy's alternative approach
I'd like to approach things slightly differently. We could keep the stylesheet as close as possible to the "real" one, and concentrate the legend-specific alterations to the layer definitions. For example, if there was a WKT layer (#630) and screen coordinates (#631) then you could have something like
```xml
[... normal style rules ...]
<Layer name=pubs srs="screen">
<Datasource type="wkt">
@ -71,7 +69,10 @@ I'd like to approach things slightly differently. We could keep the stylesheet a
<Parameter name="attributes">{"amenity","pub"}</Parameter>
</Datasource>
</Layer>
The label text for the legend could then be chosen and placed with other screen+wkt layers to get the desired effect. Although this means creating custom layers, it's likely to be less work than altering the <style> sections of a large map definition.
```
The label text for the legend could then be chosen and placed with other screen+wkt layers to get the desired effect. Although this means creating custom layers, it's likely to be less work than altering the `<style>` sections of a large map definition.
# See also
Lars Ahlzen has written a Python script for TopOSM which creates HTML snippets with images from a Mapnik style file: http://wiki.openstreetmap.org/wiki/TopOSM/Details#Map_legend