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tweak layout

Jez Nicholson 2018-01-23 13:43:48 +00:00
parent ea1558a21a
commit a17f6bb233
1 changed files with 11 additions and 8 deletions
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19
MarkersSymbolizer.md

@ -1,3 +1,10 @@
[[Symbolizer|SymbologySupport]] that specifies rendering of a tiff, png or svg image as a directional marker.
Can be used as an alternative to a [[PointSymbolizer]] to give more control over positioning of the image.
[[/images/markers_symbolizer.png]]
## Configuration Options
|*Name*|*Description*|*Default*|Applies to SVG |
--------|------------|---------|----------------|
|allow-overlap | Allow the symbolizer to overlap others. | false | yes |
@ -24,7 +31,7 @@ It can be added to a Rule with line features like:
[[/images/offsets_directions.png]]
The [[MarkersSymbolizer]] should draw blue directional arrows *in the direction of the geometry* (for things like one-way streets).
The MarkersSymbolizer should draw blue directional arrows *in the direction of the geometry* (for things like one-way streets).
In case you notice arrows pointing the wrong direction, this means that the segment has been coded in the wrong way.
@ -38,10 +45,7 @@ The ST_reverse function of Postgis can fix this (The problem will then be to ide
```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
@ -49,15 +53,14 @@ The ST_reverse function of Postgis can fix this (The problem will then be to ide
[[/images/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"/>
<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).
OSM currently renders one-way street arrows with Mapnik using several stacked [LineSymbolizers](LineSymbolizer) with varying dash-arrays, but could potentially use the [[MarkersSymbolizer]] in the future:
OSM currently renders one-way street arrows with Mapnik using several stacked instances of [LineSymbolizer] with varying dash-arrays, but could potentially use the MarkersSymbolizer in the future:
```xml
<LinePatternSymbolizer file="/home/mapnik/mapnik/symbols/arrow.png" type="png" width="74" height="8" />
<LinePatternSymbolizer file="/home/mapnik/mapnik/symbols/arrow.png" type="png" width="74" height="8" />
```