Re: [Geotools-gt2-users] SLD Questions: Hot to make hachures / hatchures

[Mauro B. <m.b...@es...>]

If you are interested, we are currently using a different approach to 
polygon fills with hatching.
Instead of using a mark, we use an ExternalGraphic having as href a wms 
request to geoserver itself.

As an example, this could be the content of <Fill>:
<GraphicFill>
    <Graphic>
        <ExternalGraphic>
            <OnlineResource xlink:type="simple" xlink:href="<dynamic 
geoserver hatch request>"/>
            <Format>image/png</Format>
        </ExternalGraphic>
        <Size>10</Size>
    </Graphic>
</GraphicFill>

where <dynamic geoserver hatch request> is a wms request with an inline 
feature describing the hatch (together with color and thickness), such 
as the following one (an horizontal hatch):

http://localhost:8080/geoserver/wms?bbox=1000000,4400000,1100000,4500000&Format=image/png&request=GetMap&transparent=true&width=100&height=100&srs=EPSG:23032&SLD_BODY=<StyledLayerDescriptor 
version="1.0.0" 
xmlns:gml="http://www.opengis.net/gml"><UserLayer><Name>pattern</Name><InlineFeature><FeatureCollection><featureMember><BodyPart><linestringProperty><gml:LineString><gml:coordinates>1001000,4451000 
1101000,4451000</gml:coordinates></gml:LineString></linestringProperty></BodyPart></featureMember></FeatureCollection></InlineFeature><UserStyle><Name>patternStyle</Name><FeatureTypeStyle><Rule><LineSymbolizer><Stroke><CssParameter 
name="stroke">%23FF0000</CssParameter><CssParameter 
name="stroke-width">2</CssParameter></Stroke></LineSymbolizer></Rule></FeatureTypeStyle></UserStyle></UserLayer></StyledLayerDescriptor>

You can use <Size> to decide spacing and use <Rotation> too.

We find this method to be extremely flexible.
If you need further details, I will be glad to ask your questions.

Mauro Bartolomeoli

Tobias Spaltenberger wrote:
> Hi Andrea,
>
> while googling on how to make polygon fills with hatching, I found
> your mail and the following page:
> http://jira.codehaus.org/browse/GEOT-829.
>
> I was able to create hatched polygons using Geoserver 1.6.3 and the
> following SLD snippet:
>
> <sld:PolygonSymbolizer>
> 	<sld:Fill>
> 		<sld:GraphicFill>
> 			<sld:Graphic>
> 				<sld:Mark>
> 					<sld:WellKnownName>hatch</sld:WellKnownName>
> 					<sld:Fill>
> 						<sld:CssParameter name="fill">#00FF00</sld:CssParameter>
> 					</sld:Fill>
> 				</sld:Mark>
> 			</sld:Graphic>
> 		</sld:GraphicFill>
> 	</sld:Fill>
> 	<sld:Stroke>
> 		<sld:CssParameter name="Stroke">#000000</sld:CssParameter>
> 		<sld:CssParameter name="Stroke-width">1</sld:CssParameter>
> 	</sld:Stroke>
> </sld:PolygonSymbolizer>
>
> I haven't found out how to change stroke width and spacing (and
> rotation other than multiples of 45 degrees) of the hatching, I don't
> know if that is possible with this Mark...
>
> Greetings,
> Tobias
>
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