[Geoserver-devel] [JIRA] (GEOS-8346) MBStyle line-gap produces strange results

GeoServer GeoServer Developer
1

Torben Barsballe created an issue

GeoServer / BugGEOS-8346

MBStyle line-gap produces strange results

Issue Type:

BugBug

Assignee:

Unassigned

Attachments:

Screen Shot 2017-10-16 at 9.49.43 AM.png

Created:

16/Oct/17 7:05 PM

Priority:

MediumMedium

Reporter:

Torben Barsballe

The line-gap property for MBStyle produces unexpected results.

MBStyle:

"type": "line",
"paint": {
    "line-color": "#FFCC00",
    "line-width": 4,
    "line-cap": "round"
}

Generated SLD:

<sld:LineSymbolizer uom="http://www.opengeospatial.org/se/units/pixel">
	<sld:Stroke>
		<sld:CssParameter name="stroke-linejoin">mitre</sld:CssParameter>
		<sld:CssParameter name="stroke-width">
		<ogc:Add>
			<ogc:Literal>8</ogc:Literal>
			<ogc:Literal>4</ogc:Literal>
		</ogc:Add>
		</sld:CssParameter>
	</sld:Stroke>
	<sld:PerpendicularOffset>0</sld:PerpendicularOffset>
</sld:LineSymbolizer>
<sld:LineSymbolizer uom="http://www.opengeospatial.org/se/units/pixel">
	<sld:Stroke>
		<sld:CssParameter name="stroke">#FFFFFF</sld:CssParameter>
		<sld:CssParameter name="stroke-linejoin">mitre</sld:CssParameter>
		<sld:CssParameter name="stroke-width">
		<ogc:Sub>
			<ogc:Add>
				<ogc:Literal>8</ogc:Literal>
				<ogc:Literal>4</ogc:Literal>
			</ogc:Add>
			<ogc:Literal>1</ogc:Literal>
		</ogc:Sub>
		</sld:CssParameter>
	</sld:Stroke>
	<sld:PerpendicularOffset>0</sld:PerpendicularOffset>
</sld:LineSymbolizer>
<sld:LineSymbolizer uom="http://www.opengeospatial.org/se/units/pixel">
	<sld:Stroke>
		<sld:CssParameter name="stroke-linejoin">mitre</sld:CssParameter>
		<sld:CssParameter name="stroke-width">8</sld:CssParameter>
	</sld:Stroke>
	<sld:PerpendicularOffset>0</sld:PerpendicularOffset>
</sld:LineSymbolizer>

This produces: A black stroke of width 12, a white stroke of width 11, and a black stroke of width 8.

What I would expect - Either:

  • Two black strokes (width 8), one with a perpendicularOffset of -6, the other with a perpendicularOffset of 6 (6 = 1/2 (width + gap) = 8+4 / 2).
  • One black stroke of width 20, one white stroke of width 4 (only as a workaround if the former doesn’t work)

Resulting visuals attached (There is some other styling on that screenshot, only the big black line is the issue here)

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