get the point location in axis

metinhoclam · August 29th, 2010, 09:40 AM

when i draw the path in SVG, the axis(x,y) will be created automatically behind XML code.
For example: when i draw the line that connects between A and B the code will be:

<path drawme="no" d="M714.9 709.627 L 861.006 712.2919" opacity="0.1" stroke-width="10"/>

it means A(x,y)=A(714.9,709.627) and B(x,y)=B(861.006,712.2919)

So when i try to draw the zigzag line the following code will be generated:
d="M128.149 96.88 L 595.3 198.8 Q 610 202.9 624.744 199.2 L 1101.6 110.161"

It means the path crossed 4 points. But for the transformation I just need to know the starting point and the end point.
The target document will be as following code:

<line>
<startpoint x="128.149" y="96.88"/>
<endpoint x="1101.6" y="110.161"/>
</line>

-----------------
Could you please give me the best solution for this transformation

mhkay · August 29th, 2010, 04:54 PM

Assuming you are using XPath 2.0, it's

Code:

tokenize(. '[p{L}\s]+')[position() = (1, 2, last()-1, last())]

If you're not using XPath 2.0, then you can't do it in pure XPath, it will need recursive templates.

metinhoclam · August 29th, 2010, 05:11 PM

I don't know how to deal with tokenize. BUt for my solution, I try like this and it's unsuccess with $y2. Could you modify something in my case.

<template name="aaa">
<xsl:variable name="x1" select="svg:path/substring-before(substring-after(@d,'M'),' ')"/>
<xsl:variable name="y1" select="svg:path/substring-before(substring-after(@d,' '),' L')"/>
<xsl:variable name="x2" select="svg:path/substring-before(substring-after(@d,' L '),' ')"/>
<xsl:variable name="y2" select="svg:path/substring-before(substring-after(@d,' '),'"')"/>
<points>
<startpoint x="{$x1}" y="{$y1}"/>
<endpoint x="{$x2}" y="{$y2}"/>
</points>
</template>

mhkay · August 29th, 2010, 05:33 PM

SVG allows any number of "M", "L", etc parts to a path. You can't find the last coordinate pair using XPath 1.0 functions such as substring-before() and substring-after(); if you're stuck with XSLT 1.0 then you'll have to use something like the EXSLT recursive str:tokenize template in place of my call on the XPath 2.0 tokenize() function. Really, you don't want to attempt this in XPath 1.0 if you can possible avoid it.