Re: GML to SVG - how to?

Milan Trninic Wed, 19 Feb 2003 10:50:08 -0800

Hi,

attached is an example of xslt for gml2svg conversion. I have the whole working example with gml data, schemas etc, but I didn't want to sent a 1 Meg attachment to the list. If anyone wants the rest of the files I will be glad to send it out.

Cheers

Milan

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Milan Trninic
Senior Software Engineer
tel: 1 604 484-2764, 484-2750
[EMAIL PROTECTED]
Galdos Systems Inc� http://www.galdosinc.com
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----- Original Message -----

From: Felipe Ga�cho

To: Batik Users

Sent: Wednesday, February 19, 2003 10:24

Subject: GML to SVG - how to?

How can I convert a GML file to a SVG format ?

Do I need to create my own xslt ?

is there any default xslt which provides a simple way to create a SVG file
from a GML ?

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<?xml version="1.0" encoding="utf-8" ?>
<!-- ====================================================================================
			XSLT Transformation Stylesheet Example
			Transforms GML2.1.1 to SVG
			Created by FreeStyler (TM) Suite
			Copyright 1999-2003 Galdos Systems Inc.
			http://www.galdosinc.com
======================================================================================= -->			
<xsl:transform xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
version="1.0"
xmlns:saxon="http://icl.com/saxon";
xmlns:Extfun="/org.opengis.gml.StyleExt"
xmlns:xlink="http://www.w3.org/1999/xlink";
xmlns:gml="http://www.opengis.net/gml";
xmlns:gml.tm="http://www.opengis.net/gml/temporal";
xmlns:wfs="http://www.galdos.com/wfs";
xmlns:exp="http://www.opengis.net/examples"; 
>
<xsl:output indent="yes"/>
<xsl:param name="CONVTYPE">pixel</xsl:param>
<xsl:param name="WIDTH">500</xsl:param>
<xsl:param name="HEIGHT">400</xsl:param>
<xsl:variable name='sumY'>
		<xsl:apply-templates select='exp:FeatureCollection/gml:boundedBy/gml:Box/gml:coordinates' mode='sumY'/>
</xsl:variable>
<xsl:variable name='scaleX'>
		<xsl:apply-templates select='exp:FeatureCollection/gml:boundedBy/gml:Box/gml:coordinates' mode='scaleX'/>
</xsl:variable>
<xsl:variable name='scaleY'>
			<xsl:apply-templates select='exp:FeatureCollection/gml:boundedBy/gml:Box/gml:coordinates' mode='scaleY'/>
	</xsl:variable>
<xsl:variable name='x1'>
			<xsl:apply-templates select='exp:FeatureCollection/gml:boundedBy/gml:Box/gml:coordinates' mode='x1'/>
</xsl:variable>
<xsl:variable name='y1'>
			<xsl:apply-templates select='exp:FeatureCollection/gml:boundedBy/gml:Box/gml:coordinates' mode='y1'/>
</xsl:variable>
<xsl:variable name="minus">-1</xsl:variable>
<xsl:variable name="one">1</xsl:variable>
<xsl:variable name="inverseScale"><xsl:value-of select="$one div $scaleX"/></xsl:variable>
<xsl:template match="/">
	<xsl:element name="svg">
		<xsl:attribute name="width"><xsl:value-of select="$WIDTH"/></xsl:attribute>
		<xsl:attribute name="height"><xsl:value-of select="$HEIGHT"/></xsl:attribute>
		<xsl:element name="defs">
			<xsl:element name='g'> 
				<xsl:attribute name='id'>Lib1_9</xsl:attribute> 
				<xsl:if test="$CONVTYPE='pixel'"> 
					<xsl:attribute name='transform'>scale(0.25)</xsl:attribute> 
				</xsl:if> 
				<xsl:if test="$CONVTYPE='user'"> 
					<xsl:attribute name='transform'>scale(<xsl:value-of select='$inverseScale'/>) scale(0.25) matrix(1 0 0 -1 0 70)</xsl:attribute> 
				</xsl:if> 
				<xsl:element name='path'> 
					<xsl:attribute name='style'>fill-rule:nonzero;fill:#EBF322;stroke:#000000;stroke-miterlimit:4;</xsl:attribute> 
					<xsl:attribute name='d'>M68.262,74.51H0.5V37.255h67.762V74.51z</xsl:attribute> 
				</xsl:element> 
				<xsl:element name='path'> 
					<xsl:attribute name='style'>fill-rule:nonzero;fill:#EBF322;stroke:#000000;stroke-miterlimit:4;</xsl:attribute> 
					<xsl:attribute name='d'>M13.793,17.647h41.176</xsl:attribute> 
				</xsl:element> 
				<xsl:element name='path'> 
					<xsl:attribute name='style'>fill-rule:nonzero;fill:#EBF322;stroke:#000000;stroke-miterlimit:4;</xsl:attribute> 
					<xsl:attribute name='d'>M31.44,0v35.294</xsl:attribute> 
				</xsl:element> 
			</xsl:element> 
		</xsl:element>
		<xsl:if test="$CONVTYPE = 'pixel'">
			<xsl:apply-templates select="//exp:Ocean/gml:extentOf" mode='Area' />
			<xsl:apply-templates select="//exp:Church/gml:location" mode='Point' />
			<xsl:apply-templates select="//exp:RL1U/gml:centerLineOf" mode='Line' />
		</xsl:if>
		<xsl:if test="$CONVTYPE = 'user'">
			<xsl:element name="g">
				<xsl:attribute name="transform">scale(<xsl:value-of select="$scaleX"/>,<xsl:value-of select="$scaleY"/>) translate(<xsl:value-of select="$minus*$x1"/>,<xsl:value-of select="$minus*$y1"/>) matrix(1 0 0 -1 0 <xsl:apply-templates select="/gml:boundedBy/gml:Box/gml:coordinates" mode="sumY"/>)</xsl:attribute>
			<xsl:apply-templates select="//exp:Ocean/gml:extentOf" mode='Area' />
			<xsl:apply-templates select="//exp:Church/gml:location" mode='Point' />
			<xsl:apply-templates select="//exp:RL1U/gml:centerLineOf" mode='Line' />
			</xsl:element>
		</xsl:if>
	</xsl:element>
</xsl:template>
<xsl:template match="gml:boundedBy/gml:Box/gml:coordinates" mode="scaleX">
	<xsl:value-of select="Extfun:getScaleX(string($WIDTH),string(text()),string(@decimal),string(@cs),string(@ts))"/>
</xsl:template>
<xsl:template match="gml:boundedBy/gml:Box/gml:coordinates" mode="scaleY">
	<xsl:value-of select="Extfun:getScaleY(string($HEIGHT),string(text()),string(@decimal),string(@cs),string(@ts))"/>
</xsl:template>
<xsl:template match="gml:boundedBy/gml:Box/gml:coordinates" mode="x1">
	<xsl:value-of select="Extfun:getX1(string(text()),string(@decimal),string(@cs),string(@ts))"/>
</xsl:template>
<xsl:template match="gml:boundedBy/gml:Box/gml:coordinates" mode="y1">
	<xsl:value-of select="Extfun:getY1(string(text()),string(@decimal),string(@cs),string(@ts))"/>
</xsl:template>
<xsl:template match="gml:boundedBy/gml:Box/gml:coordinates" mode="sumY">
	<xsl:value-of select="Extfun:getSumY(string(text()),string(@decimal),string(@cs),string(@ts))"/>
</xsl:template>
<xsl:template match="gml:boundedBy/gml:Box/gml:coordinates" mode="inverseScale">
	<xsl:value-of select="Extfun:getInverseScale(string(text()),string(@decimal),string(@cs),string(@ts))"/>
</xsl:template>
<xsl:template match="exp:Ocean/gml:extentOf" mode='Area' >
	<xsl:variable name='strokeWidth'>
		<xsl:value-of select='2'/>
	</xsl:variable>
	<xsl:variable name='rFill'>
		<xsl:value-of select='0'/>
	</xsl:variable>
	<xsl:variable name='gFill'>
		<xsl:value-of select='0'/>
	</xsl:variable>
	<xsl:variable name='bFill'>
		<xsl:value-of select='255'/>
	</xsl:variable>
	<xsl:variable name='rStroke'>
		<xsl:value-of select='0'/>
	</xsl:variable>
	<xsl:variable name='gStroke'>
		<xsl:value-of select='0'/>
	</xsl:variable>
	<xsl:variable name='bStroke'>
		<xsl:value-of select='255'/>
	</xsl:variable>
	<xsl:variable name='strokeDasharray'>6 2 2 2 2 2</xsl:variable>
	<xsl:variable name="dash0">6</xsl:variable>
	<xsl:variable name="dash1">2</xsl:variable>
	<xsl:variable name="dash2">2</xsl:variable>
	<xsl:variable name="dash3">2</xsl:variable>
	<xsl:variable name="dash4">2</xsl:variable>
	<xsl:variable name="dash5">2</xsl:variable>
	<xsl:variable name='idVar'>
	<xsl:call-template name='getAnc'>
		<xsl:with-param name='featureName' select="'exp:Ocean'"/>
	</xsl:call-template>
	</xsl:variable>
	<xsl:element name="path">
		<xsl:if test="$CONVTYPE='pixel'">
			<xsl:attribute name="style">stroke-width:<xsl:value-of select='$strokeWidth'/>;fill:rgb(<xsl:value-of select='$rFill'/>,<xsl:value-of select='$gFill'/>,<xsl:value-of select='$bFill'/>);stroke:rgb(<xsl:value-of select='$rStroke'/>,<xsl:value-of select='$gStroke'/>,<xsl:value-of select='$bStroke'/>);fill-rule:evenodd;</xsl:attribute>
		</xsl:if>
		<xsl:if test="$CONVTYPE='user'">
			<xsl:attribute name="style">stroke-width:<xsl:value-of select="$strokeWidth*$inverseScale"/>;fill:rgb(<xsl:value-of select='$rFill'/>,<xsl:value-of select='$gFill'/>,<xsl:value-of select='$bFill'/>);stroke:rgb(<xsl:value-of select='$rStroke'/>,<xsl:value-of select='$gStroke'/>,<xsl:value-of select='$bStroke'/>);</xsl:attribute>
		</xsl:if>
	<xsl:attribute name='id'><xsl:value-of select='$idVar'/></xsl:attribute>
		<xsl:attribute name="d">
			<xsl:apply-templates select=".//gml:coordinates" mode="Path" />
		</xsl:attribute>
	</xsl:element>
</xsl:template>
<xsl:template match="exp:Church/gml:location" mode='Point' >
	<xsl:variable name='idVar'>
		<xsl:call-template name='getAnc'>
			<xsl:with-param name='featureName' select="'exp:Church'"/>
		</xsl:call-template>
	</xsl:variable>
	<xsl:variable name='x'><xsl:apply-templates select='.//gml:coordinates' mode='PointX'/></xsl:variable>
	<xsl:variable name='y'><xsl:apply-templates select='.//gml:coordinates' mode='PointY'/></xsl:variable>
	<xsl:variable name='scaleValue'>
		<xsl:value-of select='1'/>
	</xsl:variable>
	<xsl:element name="use">
		<xsl:attribute name='id'><xsl:value-of select='$idVar'/></xsl:attribute>
		<xsl:attribute name="xlink:href">#Lib1_9</xsl:attribute>
		<xsl:attribute name='transform'>translate(<xsl:value-of select='$x'/>,<xsl:value-of select='$y'/>) scale(<xsl:value-of select='$scaleValue'/>)		</xsl:attribute>
	</xsl:element>
</xsl:template>
<xsl:template match="exp:RL1U/gml:centerLineOf" mode='Line' >
	<xsl:variable name='strokeWidth'>
		<xsl:value-of select='1'/>
	</xsl:variable>
	<xsl:variable name='rStroke'>
		<xsl:value-of select='255'/>
	</xsl:variable>
	<xsl:variable name='gStroke'>
		<xsl:value-of select='0'/>
	</xsl:variable>
	<xsl:variable name='bStroke'>
		<xsl:value-of select='0'/>
	</xsl:variable>
	<xsl:variable name='idVar'>
	<xsl:call-template name='getAnc'>
		<xsl:with-param name='featureName' select="'exp:RL1U'"/>
	</xsl:call-template>
	</xsl:variable>
	<xsl:element name="path">
		<xsl:if test="$CONVTYPE='pixel'">
			<xsl:attribute name="style">stroke-width:<xsl:value-of select='$strokeWidth'/>;fill:none;stroke:rgb(<xsl:value-of select='$rStroke'/>,<xsl:value-of select='$gStroke'/>,<xsl:value-of select='$bStroke'/>);</xsl:attribute>
		</xsl:if>
		<xsl:if test="$CONVTYPE='user'">
			<xsl:attribute name="style">stroke-width:<xsl:value-of select="$strokeWidth*$inverseScale"/>;fill:none;stroke:rgb(<xsl:value-of select='$rStroke'/>,<xsl:value-of select='$gStroke'/>,<xsl:value-of select='$bStroke'/>);</xsl:attribute>
		</xsl:if>
	<xsl:attribute name='id'><xsl:value-of select='$idVar'/></xsl:attribute>
		<xsl:attribute name="d">
			<xsl:apply-templates select=".//gml:coordinates" mode="Path" />
		</xsl:attribute>
	</xsl:element>
</xsl:template>
<xsl:template match="gml:coordinates" mode="PointX">
	<xsl:if test="$CONVTYPE = 'pixel'">
		<xsl:value-of select="Extfun:getPointX(string($scaleX),string($x1),string(text()),string(@decimal),string(@cs))" />
	</xsl:if>
	<xsl:if test="$CONVTYPE = 'user'">
		<xsl:value-of select="Extfun:getPointX(string(text()),string(@decimal),string(@cs))" />
	</xsl:if>
</xsl:template>
<xsl:template match="gml:coordinates" mode="PointY">
	<xsl:if test="$CONVTYPE = 'pixel'">
		<xsl:value-of select="Extfun:getPointY(string($sumY),string($scaleY),string($y1),string(text()),string(@decimal),string(@cs))" />
	</xsl:if>
	<xsl:if test="$CONVTYPE = 'user'">
		<xsl:value-of select="Extfun:getPointY(string(text()),string(@decimal),string(@cs))" />
	</xsl:if>
</xsl:template>
<xsl:template match="gml:coordinates" mode="Path">
	<xsl:if test="$CONVTYPE = 'pixel'">
		<xsl:value-of select="Extfun:convertCoordinatesToPath(string($sumY),string($scaleX),string($scaleY),string($x1),string($y1),string(text()),string(@decimal),string(@cs),string(@ts))" />
	</xsl:if>
	<xsl:if test="$CONVTYPE = 'user'">
		<xsl:value-of select="Extfun:convertCoordinatesToPath(string(text()),string(@decimal),string(@cs),string(@ts))"/>
	</xsl:if>
</xsl:template>
<xsl:template name='getAnc'>
	<xsl:param name='featureName' />
	<xsl:choose>
		<xsl:when test='name(.) = $featureName'>
			<xsl:value-of select='./@ID'/>
		</xsl:when>
		<xsl:otherwise>
			<xsl:for-each select='..'>
				<xsl:call-template name='getAnc'>
					<xsl:with-param name='featureName' select='$featureName'/>
				</xsl:call-template>
			</xsl:for-each>
		</xsl:otherwise>
	</xsl:choose>
</xsl:template>
</xsl:transform>

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Re: GML to SVG - how to?

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