scratchpad/charts/GUMP-graph.xsl

<?xml version="1.0"?>
<!--
  Copyright 2002-2004 The Apache Software Foundation

  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
  You may obtain a copy of the License at

      http://www.apache.org/licenses/LICENSE-2.0

  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.
-->

<xsl:stylesheet
  version="1.0"
  xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
  xmlns:xlink="http://www.w3.org/1999/xlink">

<xsl:variable name="graph_width">500</xsl:variable>
<xsl:variable name="graph_height">150</xsl:variable>
<xsl:variable name="graph_margin">50</xsl:variable>

<xsl:variable name="num_points" select="count(/graph/data/datum)"/>

<xsl:variable name="x_scale" select="$graph_width div ($num_points - 1)"/>
<xsl:variable name="y_scale" select="$graph_height div 100"/>

<xsl:template match="graph">
  <svg
    width="{$graph_margin + $graph_width + $graph_margin}"
    height="{$graph_margin + $graph_height + $graph_margin}">

    <title>Forrest GUMP Graphing</title>

    <style type="text/css">
      text {
        font-family: 'Verdana';
        font-size: 10px;
        stroke: none;
        fill: #000088; }
      .tick {
        fill:none;
        stroke: #000088;
        stroke-width: 1px; }
      #border {
        fill: rgb(0,192,0);
        stroke: #000088;
        stroke-width: 1px; }
      #graph-dependancy {
        fill: rgb(255,255,90);
        stroke: #000088;
        stroke-width: 1px; }
      #graph-failed {
        fill: rgb(255,0,0);
        stroke: #000088;
        stroke-width: 1px; }
      #horizontalRuler {
        fill: #000088; }
    </style>

    <defs>
      <line id="week" class="tick" x1="0" y1="0" x2="0" y2="3"/>
      <line id="month" class="tick" x1="0" y1="0" x2="0" y2="5"/>
    </defs>

    <xsl:apply-templates select="data"/>

  </svg>
</xsl:template>

<xsl:template match="data">
  <g transform="translate({$graph_margin} {$graph_margin})">

    <rect id="border" x="0" y="0" width="{$graph_width}" height="{$graph_height}"/>

    <g id="graph" transform="matrix(1 0 0 -1 0 {$graph_height})">
      <!-- Those projects which failed due to a dependancy problem -->
      <xsl:variable name="dependancy">
        <xsl:value-of select="$graph_width"/><xsl:text>,0 0,0</xsl:text>
        <xsl:for-each select="datum">
          <xsl:text> </xsl:text>
          <xsl:value-of select="(position() - 1) * $x_scale"/>
          <xsl:text>,</xsl:text>
          <xsl:value-of select="(@dependancy + @failed) * ($graph_height div (@passed + @dependancy + @failed))"/>
        </xsl:for-each>
      </xsl:variable>
      <polygon id="graph-dependancy" points="{$dependancy}"/>

      <!-- Those projects which failed to compile -->
      <xsl:variable name="failed">
        <xsl:value-of select="$graph_width"/><xsl:text>,0 0,0</xsl:text>
        <xsl:for-each select="datum">
          <xsl:text> </xsl:text>
          <xsl:value-of select="(position() - 1) * $x_scale"/>
          <xsl:text>,</xsl:text>
          <xsl:value-of select="@failed * ($graph_height div (@passed + @dependancy + @failed))"/>
        </xsl:for-each>
      </xsl:variable>
      <polygon id="graph-failed" points="{$failed}"/>
    </g>

    <g id="horizontalRuler">
      <g transform="matrix(1 0 0 -1 0 {$graph_height - 2})">
        <xsl:for-each select="datum">
          <use x="{(position() -1) * $x_scale}" xlink:href="#week"/>
        </xsl:for-each>
      </g>
      <!-- Question: how do we 'translate' weeks into a month? -->
    </g>
  </g>
</xsl:template>

</xsl:stylesheet>