sij/mapnik
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

Updated MarkersSymbolizer (markdown)

tmcw 2011-12-09 13:00:55 -08:00
parent 0379e83709
commit a703e3c1ec
1 changed files with 17 additions and 20 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

37
MarkersSymbolizer.md

@ -1,9 +1,3 @@
<!-- Name: MarkersSymbolizer -->
<!-- Version: 9 -->
<!-- Last-Modified: 2010/09/26 07:50:00 -->
<!-- Author: Ldp -->
MarkersSymbolizer, is experimental and added in r557. It currently accepts no options (see #408) but the development version supports these options:
|*Name*|*Description*|*Default*|Applies to SVG |
--------|------------|---------|----------------|
|allow_overlap | Allow the symbolizer to overlap others. | false | yes |
@ -23,10 +17,10 @@ MarkersSymbolizer, is experimental and added in r557. It currently accepts no op
It can be added to a Rule with line features like:
#!xml
<MarkersSymbolizer />
```xml
<MarkersSymbolizer />
```
[[BR]]
[[Image(http://trac.mapnik.org/raw-attachment/ticket/180/offsets_directions.png)]]
The MarkersSymbolizer should draw blue directional arrows *in the direction of the geometry* (for things like one-way streets).[[BR]]
@ -36,28 +30,31 @@ The ST_reverse function of Postgis can fix this (The problem will then be to ide
### SVG markers
*NEW*: Staring from r1793 MarkersSymbolizer supports [Scalable Vector Graphics (SVG)](http://www.w3.org/TR/SVG/) as input images:
[[Image(markers_symbolizer.png)]]
[[Image(markers_symbolizer.png)]]
#!xml
<Rule>
<MaxScaleDenominator>10000</MaxScaleDenominator>
<MarkersSymbolizer spacing="100" file="/Users/artem/Desktop/svg/ladybird.svg" transform="translate(0 -16) scale(2.0)"/>
</Rule>
```xml
<Rule>
<MaxScaleDenominator>10000</MaxScaleDenominator>
<MarkersSymbolizer spacing="100" file="/Users/artem/Desktop/svg/ladybird.svg" transform="translate(0 -16) scale(2.0)"/>
</Rule>
```
### Dynamic Ellipses
*NEW*: Starting from r2158 MarkersSymbolizer supports width/height/fill/stroke properties to dynamically draw circles (w == h) or ellipses (w != h) when no SVG file is supplied:
[[Image(dynamic_ellipse_markers.png)]]
[Image](dynamic_ellipse_markers.png)
#!xml
<MarkersSymbolizer fill="darkorange" opacity=".7" width="20" height="10" stroke="orange" stroke-width="7" stroke-opacity=".2" placement="point" marker_type="ellipse"/>
```xml
<MarkersSymbolizer fill="darkorange" opacity=".7" width="20" height="10" stroke="orange" stroke-width="7" stroke-opacity=".2" placement="point" marker_type="ellipse"/>
```
CAVEAT: these properties do not apply to SVG files, and SVG transforms are not supported for modifying ellipses (yet).
[[BR]]
OSM currently renders one-way street arrows with Mapnik using several stacked LineSymbolizers with varying dash-arrays, but could potentially use the MarkersSymbolizer in the future:
<LinePatternSymbolizer file="/home/mapnik/mapnik/symbols/arrow.png" type="png" width="74" height="8" />
```xml
<LinePatternSymbolizer file="/home/mapnik/mapnik/symbols/arrow.png" type="png" width="74" height="8" />
```