[xsl] Passing parameters between different occurrences of the same template

[Ranajay Raychaudhuri <raychaur at cs dot man dot ac dot uk>]

Dear All,

I am trying to draw a 2D linear graph using SVG.
My code  looks like this:


<xsl:template.....>
........
        <xsl:for-each select="output">
          <xsl:apply-templates select=".">

        <xsl:with-param name="x_offset">
             <xsl:choose>
              <xsl:when test="position() = 1">
                   <xsl:value-of select="'80'"/>
              </xsl:when>
              <xsl:otherwise>
                   <xsl:value-of select="80 + (prog_vel/.)*50"/>
              </xsl:otherwise>
             </xsl:choose>
    </xsl:with-param>

    <xsl:with-param name="y_offset">
         <xsl:choose>
          <xsl:when test="position() = 1">
               <xsl:value-of select="'600'"/>
          </xsl:when>
          <xsl:otherwise>
               <xsl:value-of select="600 - (cor_time/.)*50"/>
          </xsl:otherwise>
        </xsl:choose>
    </xsl:with-param>

     </xsl:apply-templates>

 </xsl:for-each>
 </svg>
 </xsl:template>


<xsl:template match="output">

    <xsl:param name="x-offset" select="'80'"/>
    <xsl:param name="y-offset" select="'600'"/>


 <xsl:variable name="x_cord">
      <xsl:value-of select="80 + (prog_vel/.)*50"/>
    </xsl:variable>

    <xsl:variable name="y_cord">
      <xsl:value-of select="600 - (cor_time/.)*50"/>
    </xsl:variable>


    <path>
      <xsl:attribute name="style">
        <xsl:text>stroke-width:2; stroke:black; fill:black</xsl:text>
      </xsl:attribute>
      <xsl:attribute name="d">

        <xsl:text>M </xsl:text>
        <xsl:value-of select="$x_offset"/>
        <xsl:text> </xsl:text>
        <xsl:value-of select="$y_offset"/>
        <xsl:text> L </xsl:text>
        <xsl:value-of select="$x_cord"/>
        <xsl:text> </xsl:text>
        <xsl:value-of select="$y_cord"/>
...
</xsl:template>

My problem is that I need to pass the values of x_cord and y_cord in one
template to the next call of the template in the for-each loop, so that
the generated code would look like:

<path style="stroke-width:2; stroke:black; fill:black" d="M 80 600 L 250
540 Z"/>
<path style="stroke-width:2; stroke:black; fill:black" d="M 250 540 L
370 375 Z"/>

i.e, the values associated with the L command in the 1st <path> stmt.,
are associated with the M command in the next <path> stmt.

Right now predictably this is what it the generated path stmts. look
like:

<path style="stroke-width:2; stroke:black; fill:black" d="M 80 600 L 250
540 Z"/>
<path style="stroke-width:2; stroke:black; fill:black" d="M 370 375 L
370 375 Z"/>


My XML looks like:


<XEX-data>
  <output>
        <prog_vel>3.4</prog_vel>
        <cor_time>1.2</cor_time>
  </output>
  <output>
        <prog_vel>5.8</prog_vel>
        <cor_time>4.5</cor_time>
  </output>
</XEX-data>

I can't find a way around this. Please help.

Thanks,
Ron


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