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twentyone-world.github.io/source/renderer/svg.html
Gigi 855a4176e2 Initial import
2022-04-26 00:05:09 +02:00

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<!DOCTYPE html>
<html>
<head>
<meta http-equiv="content-type" content="text/html;charset=utf-8">
<title>svg.py</title>
<link rel="stylesheet" href="../pycco.css">
</head>
<body>
<div id="background"></div>
<div id='container'>
<div class='section'>
<div class='docs'><h1>svg.py</h1></div>
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<div class='section' id='section-0'>
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<div class='code'>
<div class="highlight"><pre><span class="kn">from</span> <span class="nn">kartograph.renderer</span> <span class="kn">import</span> <span class="n">MapRenderer</span>
<span class="kn">from</span> <span class="nn">kartograph.errors</span> <span class="kn">import</span> <span class="n">KartographError</span></pre></div>
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<p>This script contains everything that is needed by Kartograph to finally
render the processed maps into SVG files.</p>
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<div class="highlight"><pre></pre></div>
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<p>The SVG renderer is based on xml.dom.minidom.</p>
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<div class='code'>
<div class="highlight"><pre><span class="kn">from</span> <span class="nn">xml.dom</span> <span class="kn">import</span> <span class="n">minidom</span>
<span class="kn">from</span> <span class="nn">xml.dom.minidom</span> <span class="kn">import</span> <span class="n">parse</span>
<span class="kn">import</span> <span class="nn">re</span></pre></div>
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<div class="highlight"><pre><span class="k">class</span> <span class="nc">SvgRenderer</span><span class="p">(</span><span class="n">MapRenderer</span><span class="p">):</span></pre></div>
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<p>The render() method prepares a new empty SVG document and
stores all the layer features into SVG groups.</p>
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<div class='code'>
<div class="highlight"><pre> <span class="k">def</span> <span class="nf">render</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span></pre></div>
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<div class="highlight"><pre> <span class="bp">self</span><span class="o">.</span><span class="n">_init_svg_doc</span><span class="p">()</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_store_layers_to_svg</span><span class="p">()</span></pre></div>
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<div class="highlight"><pre> <span class="k">def</span> <span class="nf">_init_svg_doc</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span></pre></div>
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<p>Load width and height of the map view
We add two pixels to the height to ensure that
the map fits.</p>
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<div class='code'>
<div class="highlight"><pre> <span class="n">w</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">map</span><span class="o">.</span><span class="n">view</span><span class="o">.</span><span class="n">width</span>
<span class="n">h</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">map</span><span class="o">.</span><span class="n">view</span><span class="o">.</span><span class="n">height</span> <span class="o">+</span> <span class="mi">2</span></pre></div>
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<p>SvgDocument is a handy wrapper around xml.dom.minidom. It is defined below.</p>
</div>
<div class='code'>
<div class="highlight"><pre> <span class="n">svg</span> <span class="o">=</span> <span class="n">SvgDocument</span><span class="p">(</span>
<span class="n">width</span><span class="o">=</span><span class="s">&#39;</span><span class="si">%d</span><span class="s">px&#39;</span> <span class="o">%</span> <span class="n">w</span><span class="p">,</span>
<span class="n">height</span><span class="o">=</span><span class="s">&#39;</span><span class="si">%d</span><span class="s">px&#39;</span> <span class="o">%</span> <span class="n">h</span><span class="p">,</span>
<span class="n">viewBox</span><span class="o">=</span><span class="s">&#39;0 0 </span><span class="si">%d</span><span class="s"> </span><span class="si">%d</span><span class="s">&#39;</span> <span class="o">%</span> <span class="p">(</span><span class="n">w</span><span class="p">,</span> <span class="n">h</span><span class="p">),</span>
<span class="n">enable_background</span><span class="o">=</span><span class="s">&#39;new 0 0 </span><span class="si">%d</span><span class="s"> </span><span class="si">%d</span><span class="s">&#39;</span> <span class="o">%</span> <span class="p">(</span><span class="n">w</span><span class="p">,</span> <span class="n">h</span><span class="p">),</span>
<span class="n">style</span><span class="o">=</span><span class="s">&#39;stroke-linejoin: round; stroke:#000; fill:#f6f3f0;&#39;</span><span class="p">)</span>
<span class="n">defs</span> <span class="o">=</span> <span class="n">svg</span><span class="o">.</span><span class="n">node</span><span class="p">(</span><span class="s">&#39;defs&#39;</span><span class="p">,</span> <span class="n">svg</span><span class="o">.</span><span class="n">root</span><span class="p">)</span>
<span class="n">style</span> <span class="o">=</span> <span class="n">svg</span><span class="o">.</span><span class="n">node</span><span class="p">(</span><span class="s">&#39;style&#39;</span><span class="p">,</span> <span class="n">defs</span><span class="p">,</span> <span class="nb">type</span><span class="o">=</span><span class="s">&#39;text/css&#39;</span><span class="p">)</span>
<span class="n">css</span> <span class="o">=</span> <span class="s">&#39;path { fill-rule: evenodd; }</span><span class="se">\n</span><span class="s">#context path { fill: #eee; stroke: #bbb; } &#39;</span>
<span class="n">svg</span><span class="o">.</span><span class="n">cdata</span><span class="p">(</span><span class="n">css</span><span class="p">,</span> <span class="n">style</span><span class="p">)</span>
<span class="n">metadata</span> <span class="o">=</span> <span class="n">svg</span><span class="o">.</span><span class="n">node</span><span class="p">(</span><span class="s">&#39;metadata&#39;</span><span class="p">,</span> <span class="n">svg</span><span class="o">.</span><span class="n">root</span><span class="p">)</span>
<span class="n">views</span> <span class="o">=</span> <span class="n">svg</span><span class="o">.</span><span class="n">node</span><span class="p">(</span><span class="s">&#39;views&#39;</span><span class="p">,</span> <span class="n">metadata</span><span class="p">)</span>
<span class="n">view</span> <span class="o">=</span> <span class="n">svg</span><span class="o">.</span><span class="n">node</span><span class="p">(</span><span class="s">&#39;view&#39;</span><span class="p">,</span> <span class="n">views</span><span class="p">,</span>
<span class="n">padding</span><span class="o">=</span><span class="nb">str</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">map</span><span class="o">.</span><span class="n">options</span><span class="p">[</span><span class="s">&#39;bounds&#39;</span><span class="p">][</span><span class="s">&#39;padding&#39;</span><span class="p">]),</span> <span class="n">w</span><span class="o">=</span><span class="n">w</span><span class="p">,</span> <span class="n">h</span><span class="o">=</span><span class="n">h</span><span class="p">)</span>
<span class="n">svg</span><span class="o">.</span><span class="n">node</span><span class="p">(</span><span class="s">&#39;proj&#39;</span><span class="p">,</span> <span class="n">view</span><span class="p">,</span> <span class="o">**</span><span class="bp">self</span><span class="o">.</span><span class="n">map</span><span class="o">.</span><span class="n">proj</span><span class="o">.</span><span class="n">attrs</span><span class="p">())</span>
<span class="n">svg</span><span class="o">.</span><span class="n">node</span><span class="p">(</span><span class="s">&#39;bbox&#39;</span><span class="p">,</span> <span class="n">view</span><span class="p">,</span>
<span class="n">x</span><span class="o">=</span><span class="nb">round</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">map</span><span class="o">.</span><span class="n">src_bbox</span><span class="o">.</span><span class="n">left</span><span class="p">,</span> <span class="mi">2</span><span class="p">),</span>
<span class="n">y</span><span class="o">=</span><span class="nb">round</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">map</span><span class="o">.</span><span class="n">src_bbox</span><span class="o">.</span><span class="n">top</span><span class="p">,</span> <span class="mi">2</span><span class="p">),</span>
<span class="n">w</span><span class="o">=</span><span class="nb">round</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">map</span><span class="o">.</span><span class="n">src_bbox</span><span class="o">.</span><span class="n">width</span><span class="p">,</span> <span class="mi">2</span><span class="p">),</span>
<span class="n">h</span><span class="o">=</span><span class="nb">round</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">map</span><span class="o">.</span><span class="n">src_bbox</span><span class="o">.</span><span class="n">height</span><span class="p">,</span> <span class="mi">2</span><span class="p">))</span>
<span class="n">ll</span> <span class="o">=</span> <span class="p">[</span><span class="o">-</span><span class="mi">180</span><span class="p">,</span> <span class="o">-</span><span class="mi">90</span><span class="p">,</span> <span class="mi">180</span><span class="p">,</span> <span class="mi">90</span><span class="p">]</span>
<span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">map</span><span class="o">.</span><span class="n">options</span><span class="p">[</span><span class="s">&#39;bounds&#39;</span><span class="p">][</span><span class="s">&#39;mode&#39;</span><span class="p">]</span> <span class="o">==</span> <span class="s">&quot;bbox&quot;</span><span class="p">:</span>
<span class="n">ll</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">map</span><span class="o">.</span><span class="n">options</span><span class="p">[</span><span class="s">&#39;bounds&#39;</span><span class="p">][</span><span class="s">&#39;data&#39;</span><span class="p">]</span>
<span class="n">svg</span><span class="o">.</span><span class="n">node</span><span class="p">(</span><span class="s">&#39;llbbox&#39;</span><span class="p">,</span> <span class="n">view</span><span class="p">,</span>
<span class="n">lon0</span><span class="o">=</span><span class="n">ll</span><span class="p">[</span><span class="mi">0</span><span class="p">],</span> <span class="n">lon1</span><span class="o">=</span><span class="n">ll</span><span class="p">[</span><span class="mi">2</span><span class="p">],</span>
<span class="n">lat0</span><span class="o">=</span><span class="n">ll</span><span class="p">[</span><span class="mi">1</span><span class="p">],</span> <span class="n">lat1</span><span class="o">=</span><span class="n">ll</span><span class="p">[</span><span class="mi">3</span><span class="p">])</span>
<span class="bp">self</span><span class="o">.</span><span class="n">svg</span> <span class="o">=</span> <span class="n">svg</span></pre></div>
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<p>store features in svg</p>
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<div class='code'>
<div class="highlight"><pre> <span class="k">def</span> <span class="nf">_store_layers_to_svg</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span></pre></div>
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<div class="highlight"><pre> <span class="n">svg</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">svg</span>
<span class="k">for</span> <span class="n">layer</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">map</span><span class="o">.</span><span class="n">layers</span><span class="p">:</span>
<span class="k">if</span> <span class="nb">len</span><span class="p">(</span><span class="n">layer</span><span class="o">.</span><span class="n">features</span><span class="p">)</span> <span class="o">==</span> <span class="mi">0</span><span class="p">:</span>
<span class="k">print</span> <span class="s">&quot;ignoring empty layer&quot;</span><span class="p">,</span> <span class="n">layer</span><span class="o">.</span><span class="n">id</span>
<span class="k">continue</span> <span class="c"># ignore empty layers</span>
<span class="n">g</span> <span class="o">=</span> <span class="n">svg</span><span class="o">.</span><span class="n">node</span><span class="p">(</span><span class="s">&#39;g&#39;</span><span class="p">,</span> <span class="n">svg</span><span class="o">.</span><span class="n">root</span><span class="p">,</span> <span class="nb">id</span><span class="o">=</span><span class="n">layer</span><span class="o">.</span><span class="n">id</span><span class="p">)</span>
<span class="k">for</span> <span class="n">feat</span> <span class="ow">in</span> <span class="n">layer</span><span class="o">.</span><span class="n">features</span><span class="p">:</span>
<span class="n">node</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">_render_feature</span><span class="p">(</span><span class="n">feat</span><span class="p">,</span> <span class="n">layer</span><span class="o">.</span><span class="n">options</span><span class="p">[</span><span class="s">&#39;attributes&#39;</span><span class="p">])</span>
<span class="k">if</span> <span class="n">node</span> <span class="ow">is</span> <span class="ow">not</span> <span class="bp">None</span><span class="p">:</span>
<span class="n">g</span><span class="o">.</span><span class="n">appendChild</span><span class="p">(</span><span class="n">node</span><span class="p">)</span>
<span class="k">else</span><span class="p">:</span>
<span class="k">print</span> <span class="s">&quot;feature.to_svg is None&quot;</span><span class="p">,</span> <span class="n">feat</span>
<span class="k">if</span> <span class="s">&#39;styles&#39;</span> <span class="ow">in</span> <span class="n">layer</span><span class="o">.</span><span class="n">options</span><span class="p">:</span>
<span class="k">for</span> <span class="n">prop</span> <span class="ow">in</span> <span class="n">layer</span><span class="o">.</span><span class="n">options</span><span class="p">[</span><span class="s">&#39;styles&#39;</span><span class="p">]:</span>
<span class="n">g</span><span class="o">.</span><span class="n">setAttribute</span><span class="p">(</span><span class="n">prop</span><span class="p">,</span> <span class="nb">str</span><span class="p">(</span><span class="n">layer</span><span class="o">.</span><span class="n">options</span><span class="p">[</span><span class="s">&#39;styles&#39;</span><span class="p">][</span><span class="n">prop</span><span class="p">]))</span></pre></div>
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<div class='code'>
<div class="highlight"><pre> <span class="k">def</span> <span class="nf">_render_feature</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">feature</span><span class="p">,</span> <span class="n">attributes</span><span class="o">=</span><span class="p">[]):</span>
<span class="n">node</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">_render_geometry</span><span class="p">(</span><span class="n">feature</span><span class="o">.</span><span class="n">geometry</span><span class="p">)</span>
<span class="k">if</span> <span class="n">node</span> <span class="ow">is</span> <span class="bp">None</span><span class="p">:</span>
<span class="k">return</span> <span class="bp">None</span>
<span class="k">for</span> <span class="n">cfg</span> <span class="ow">in</span> <span class="n">attributes</span><span class="p">:</span>
<span class="k">if</span> <span class="s">&#39;src&#39;</span> <span class="ow">in</span> <span class="n">cfg</span><span class="p">:</span>
<span class="n">tgt</span> <span class="o">=</span> <span class="n">re</span><span class="o">.</span><span class="n">sub</span><span class="p">(</span><span class="s">&#39;(\W|_)+&#39;</span><span class="p">,</span> <span class="s">&#39;-&#39;</span><span class="p">,</span> <span class="n">cfg</span><span class="p">[</span><span class="s">&#39;tgt&#39;</span><span class="p">]</span><span class="o">.</span><span class="n">lower</span><span class="p">())</span>
<span class="k">if</span> <span class="n">cfg</span><span class="p">[</span><span class="s">&#39;src&#39;</span><span class="p">]</span> <span class="ow">not</span> <span class="ow">in</span> <span class="n">feature</span><span class="o">.</span><span class="n">props</span><span class="p">:</span>
<span class="k">continue</span></pre></div>
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<p>raise KartographError(('attribute not found "%s"'%cfg['src']))</p>
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<div class='code'>
<div class="highlight"><pre> <span class="n">val</span> <span class="o">=</span> <span class="n">feature</span><span class="o">.</span><span class="n">props</span><span class="p">[</span><span class="n">cfg</span><span class="p">[</span><span class="s">&#39;src&#39;</span><span class="p">]]</span>
<span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">val</span><span class="p">,</span> <span class="p">(</span><span class="nb">int</span><span class="p">,</span> <span class="nb">float</span><span class="p">)):</span>
<span class="n">val</span> <span class="o">=</span> <span class="nb">str</span><span class="p">(</span><span class="n">val</span><span class="p">)</span>
<span class="n">node</span><span class="o">.</span><span class="n">setAttribute</span><span class="p">(</span><span class="s">&#39;data-&#39;</span> <span class="o">+</span> <span class="n">tgt</span><span class="p">,</span> <span class="n">val</span><span class="p">)</span>
<span class="k">if</span> <span class="n">tgt</span> <span class="o">==</span> <span class="s">&quot;id&quot;</span><span class="p">:</span>
<span class="n">node</span><span class="o">.</span><span class="n">setAttribute</span><span class="p">(</span><span class="s">&#39;id&#39;</span><span class="p">,</span> <span class="n">val</span><span class="p">)</span>
<span class="k">elif</span> <span class="s">&#39;where&#39;</span> <span class="ow">in</span> <span class="n">cfg</span><span class="p">:</span></pre></div>
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<p>can be used to replace attributes...</p>
</div>
<div class='code'>
<div class="highlight"><pre> <span class="n">src</span> <span class="o">=</span> <span class="n">cfg</span><span class="p">[</span><span class="s">&#39;where&#39;</span><span class="p">]</span>
<span class="n">tgt</span> <span class="o">=</span> <span class="n">cfg</span><span class="p">[</span><span class="s">&#39;set&#39;</span><span class="p">]</span>
<span class="k">if</span> <span class="nb">len</span><span class="p">(</span><span class="n">cfg</span><span class="p">[</span><span class="s">&#39;equals&#39;</span><span class="p">])</span> <span class="o">!=</span> <span class="nb">len</span><span class="p">(</span><span class="n">cfg</span><span class="p">[</span><span class="s">&#39;to&#39;</span><span class="p">]):</span>
<span class="k">raise</span> <span class="n">KartographError</span><span class="p">(</span><span class="s">&#39;attributes: &quot;equals&quot; and &quot;to&quot; arrays must be of same length&#39;</span><span class="p">)</span>
<span class="k">for</span> <span class="n">i</span> <span class="ow">in</span> <span class="nb">range</span><span class="p">(</span><span class="nb">len</span><span class="p">(</span><span class="n">cfg</span><span class="p">[</span><span class="s">&#39;equals&#39;</span><span class="p">])):</span>
<span class="k">if</span> <span class="n">feature</span><span class="o">.</span><span class="n">props</span><span class="p">[</span><span class="n">src</span><span class="p">]</span> <span class="o">==</span> <span class="n">cfg</span><span class="p">[</span><span class="s">&#39;equals&#39;</span><span class="p">][</span><span class="n">i</span><span class="p">]:</span>
<span class="n">node</span><span class="o">.</span><span class="n">setAttribute</span><span class="p">(</span><span class="s">&#39;data-&#39;</span> <span class="o">+</span> <span class="n">tgt</span><span class="p">,</span> <span class="n">cfg</span><span class="p">[</span><span class="s">&#39;to&#39;</span><span class="p">][</span><span class="n">i</span><span class="p">])</span>
<span class="k">if</span> <span class="s">&#39;__color__&#39;</span> <span class="ow">in</span> <span class="n">feature</span><span class="o">.</span><span class="n">props</span><span class="p">:</span>
<span class="n">node</span><span class="o">.</span><span class="n">setAttribute</span><span class="p">(</span><span class="s">&#39;fill&#39;</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">props</span><span class="p">[</span><span class="s">&#39;__color__&#39;</span><span class="p">])</span>
<span class="k">return</span> <span class="n">node</span></pre></div>
</div>
</div>
<div class='clearall'></div>
<div class='section' id='section-14'>
<div class='docs'>
<div class='octowrap'>
<a class='octothorpe' href='#section-14'>#</a>
</div>
</div>
<div class='code'>
<div class="highlight"><pre> <span class="k">def</span> <span class="nf">_render_geometry</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">geometry</span><span class="p">):</span>
<span class="kn">from</span> <span class="nn">shapely.geometry</span> <span class="kn">import</span> <span class="n">Polygon</span><span class="p">,</span> <span class="n">MultiPolygon</span>
<span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">geometry</span><span class="p">,</span> <span class="p">(</span><span class="n">Polygon</span><span class="p">,</span> <span class="n">MultiPolygon</span><span class="p">)):</span>
<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">_render_polygon</span><span class="p">(</span><span class="n">geometry</span><span class="p">)</span></pre></div>
</div>
</div>
<div class='clearall'></div>
<div class='section' id='section-15'>
<div class='docs'>
<div class='octowrap'>
<a class='octothorpe' href='#section-15'>#</a>
</div>
<p>constructs a svg representation of a polygon</p>
</div>
<div class='code'>
<div class="highlight"><pre> <span class="k">def</span> <span class="nf">_render_polygon</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">geometry</span><span class="p">):</span></pre></div>
</div>
</div>
<div class='clearall'></div>
<div class='section' id='section-16'>
<div class='docs'>
<div class='octowrap'>
<a class='octothorpe' href='#section-16'>#</a>
</div>
</div>
<div class='code'>
<div class="highlight"><pre> <span class="n">_round</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">map</span><span class="o">.</span><span class="n">options</span><span class="p">[</span><span class="s">&#39;export&#39;</span><span class="p">][</span><span class="s">&#39;round&#39;</span><span class="p">]</span>
<span class="n">path_str</span> <span class="o">=</span> <span class="s">&quot;&quot;</span>
<span class="k">if</span> <span class="n">_round</span> <span class="ow">is</span> <span class="bp">False</span><span class="p">:</span>
<span class="n">fmt</span> <span class="o">=</span> <span class="s">&#39;</span><span class="si">%f</span><span class="s">,</span><span class="si">%f</span><span class="s">&#39;</span>
<span class="k">else</span><span class="p">:</span>
<span class="n">fmt</span> <span class="o">=</span> <span class="s">&#39;%.&#39;</span> <span class="o">+</span> <span class="nb">str</span><span class="p">(</span><span class="n">_round</span><span class="p">)</span> <span class="o">+</span> <span class="s">&#39;f&#39;</span>
<span class="n">fmt</span> <span class="o">=</span> <span class="n">fmt</span> <span class="o">+</span> <span class="s">&#39;,&#39;</span> <span class="o">+</span> <span class="n">fmt</span>
<span class="n">geoms</span> <span class="o">=</span> <span class="nb">hasattr</span><span class="p">(</span><span class="n">geometry</span><span class="p">,</span> <span class="s">&#39;geoms&#39;</span><span class="p">)</span> <span class="ow">and</span> <span class="n">geometry</span><span class="o">.</span><span class="n">geoms</span> <span class="ow">or</span> <span class="p">[</span><span class="n">geometry</span><span class="p">]</span>
<span class="k">for</span> <span class="n">polygon</span> <span class="ow">in</span> <span class="n">geoms</span><span class="p">:</span>
<span class="k">if</span> <span class="n">polygon</span> <span class="ow">is</span> <span class="bp">None</span><span class="p">:</span>
<span class="k">continue</span>
<span class="k">for</span> <span class="n">ring</span> <span class="ow">in</span> <span class="p">[</span><span class="n">polygon</span><span class="o">.</span><span class="n">exterior</span><span class="p">]</span> <span class="o">+</span> <span class="nb">list</span><span class="p">(</span><span class="n">polygon</span><span class="o">.</span><span class="n">interiors</span><span class="p">):</span>
<span class="n">cont_str</span> <span class="o">=</span> <span class="s">&quot;&quot;</span>
<span class="n">kept</span> <span class="o">=</span> <span class="p">[]</span>
<span class="k">for</span> <span class="n">pt</span> <span class="ow">in</span> <span class="n">ring</span><span class="o">.</span><span class="n">coords</span><span class="p">:</span>
<span class="n">kept</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">pt</span><span class="p">)</span>
<span class="k">if</span> <span class="nb">len</span><span class="p">(</span><span class="n">kept</span><span class="p">)</span> <span class="o">&lt;=</span> <span class="mi">3</span><span class="p">:</span>
<span class="k">continue</span>
<span class="k">for</span> <span class="n">pt</span> <span class="ow">in</span> <span class="n">kept</span><span class="p">:</span>
<span class="k">if</span> <span class="n">cont_str</span> <span class="o">==</span> <span class="s">&quot;&quot;</span><span class="p">:</span>
<span class="n">cont_str</span> <span class="o">=</span> <span class="s">&quot;M&quot;</span>
<span class="k">else</span><span class="p">:</span>
<span class="n">cont_str</span> <span class="o">+=</span> <span class="s">&quot;L&quot;</span>
<span class="n">cont_str</span> <span class="o">+=</span> <span class="n">fmt</span> <span class="o">%</span> <span class="n">pt</span>
<span class="n">cont_str</span> <span class="o">+=</span> <span class="s">&quot;Z &quot;</span>
<span class="n">path_str</span> <span class="o">+=</span> <span class="n">cont_str</span>
<span class="k">if</span> <span class="n">path_str</span> <span class="o">==</span> <span class="s">&quot;&quot;</span><span class="p">:</span>
<span class="k">return</span> <span class="bp">None</span>
<span class="n">path</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">svg</span><span class="o">.</span><span class="n">node</span><span class="p">(</span><span class="s">&#39;path&#39;</span><span class="p">,</span> <span class="n">d</span><span class="o">=</span><span class="n">path_str</span><span class="p">)</span>
<span class="k">return</span> <span class="n">path</span></pre></div>
</div>
</div>
<div class='clearall'></div>
<div class='section' id='section-17'>
<div class='docs'>
<div class='octowrap'>
<a class='octothorpe' href='#section-17'>#</a>
</div>
</div>
<div class='code'>
<div class="highlight"><pre> <span class="k">def</span> <span class="nf">write</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">filename</span><span class="p">):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">svg</span><span class="o">.</span><span class="n">write</span><span class="p">(</span><span class="n">filename</span><span class="p">)</span></pre></div>
</div>
</div>
<div class='clearall'></div>
<div class='section' id='section-18'>
<div class='docs'>
<div class='octowrap'>
<a class='octothorpe' href='#section-18'>#</a>
</div>
</div>
<div class='code'>
<div class="highlight"><pre> <span class="k">def</span> <span class="nf">preview</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">svg</span><span class="o">.</span><span class="n">preview</span><span class="p">()</span></pre></div>
</div>
</div>
<div class='clearall'></div>
<div class='section' id='section-19'>
<div class='docs'>
<div class='octowrap'>
<a class='octothorpe' href='#section-19'>#</a>
</div>
<h2>SvgDocument</h2>
<p>SVGDocument is a handy wrapper around xml.dom.minidom which allows us
to quickly build XML structures. It is largely inspired by the SVG class
of the <a href="http://code.google.com/p/svgfig/">svgfig</a> project, which was
used by one of the earlier versions of Kartograph.</p>
</div>
<div class='code'>
<div class="highlight"><pre></pre></div>
</div>
</div>
<div class='clearall'></div>
<div class='section' id='section-20'>
<div class='docs'>
<div class='octowrap'>
<a class='octothorpe' href='#section-20'>#</a>
</div>
</div>
<div class='code'>
<div class="highlight"><pre><span class="k">class</span> <span class="nc">SvgDocument</span><span class="p">(</span><span class="nb">object</span><span class="p">):</span></pre></div>
</div>
</div>
<div class='clearall'></div>
<div class='section' id='section-21'>
<div class='docs'>
<div class='octowrap'>
<a class='octothorpe' href='#section-21'>#</a>
</div>
<p>Of course, we need to create and XML document with all this
boring SVG header stuff added to it.</p>
</div>
<div class='code'>
<div class="highlight"><pre> <span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">):</span>
<span class="n">imp</span> <span class="o">=</span> <span class="n">minidom</span><span class="o">.</span><span class="n">getDOMImplementation</span><span class="p">(</span><span class="s">&#39;&#39;</span><span class="p">)</span>
<span class="n">dt</span> <span class="o">=</span> <span class="n">imp</span><span class="o">.</span><span class="n">createDocumentType</span><span class="p">(</span><span class="s">&#39;svg&#39;</span><span class="p">,</span>
<span class="s">&#39;-//W3C//DTD SVG 1.1//EN&#39;</span><span class="p">,</span>
<span class="s">&#39;http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd&#39;</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">doc</span> <span class="o">=</span> <span class="n">imp</span><span class="o">.</span><span class="n">createDocument</span><span class="p">(</span><span class="s">&#39;http://www.w3.org/2000/svg&#39;</span><span class="p">,</span> <span class="s">&#39;svg&#39;</span><span class="p">,</span> <span class="n">dt</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">root</span> <span class="o">=</span> <span class="n">svg</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">doc</span><span class="o">.</span><span class="n">getElementsByTagName</span><span class="p">(</span><span class="s">&#39;svg&#39;</span><span class="p">)[</span><span class="mi">0</span><span class="p">]</span>
<span class="n">svg</span><span class="o">.</span><span class="n">setAttribute</span><span class="p">(</span><span class="s">&#39;xmlns&#39;</span><span class="p">,</span> <span class="s">&#39;http://www.w3.org/2000/svg&#39;</span><span class="p">)</span>
<span class="n">svg</span><span class="o">.</span><span class="n">setAttribute</span><span class="p">(</span><span class="s">&#39;version&#39;</span><span class="p">,</span> <span class="s">&#39;1.1&#39;</span><span class="p">)</span>
<span class="n">svg</span><span class="o">.</span><span class="n">setAttribute</span><span class="p">(</span><span class="s">&#39;xmlns:xlink&#39;</span><span class="p">,</span> <span class="s">&#39;http://www.w3.org/1999/xlink&#39;</span><span class="p">)</span>
<span class="n">_add_attrs</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">root</span><span class="p">,</span> <span class="n">kwargs</span><span class="p">)</span></pre></div>
</div>
</div>
<div class='clearall'></div>
<div class='section' id='section-22'>
<div class='docs'>
<div class='octowrap'>
<a class='octothorpe' href='#section-22'>#</a>
</div>
<p>This is the magic of SvgDocument. Instead of having to do appendChild()
and addAttribute() for every node we create, we just call svgdoc.node()
which is smart enough to append itself to the parent if we specify one,
and also sets all attributes we pass as keyword arguments.</p>
</div>
<div class='code'>
<div class="highlight"><pre> <span class="k">def</span> <span class="nf">node</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">name</span><span class="p">,</span> <span class="n">parent</span><span class="o">=</span><span class="bp">None</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">):</span>
<span class="n">el</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">doc</span><span class="o">.</span><span class="n">createElement</span><span class="p">(</span><span class="n">name</span><span class="p">)</span>
<span class="n">_add_attrs</span><span class="p">(</span><span class="n">el</span><span class="p">,</span> <span class="n">kwargs</span><span class="p">)</span>
<span class="k">if</span> <span class="n">parent</span> <span class="ow">is</span> <span class="ow">not</span> <span class="bp">None</span><span class="p">:</span>
<span class="n">parent</span><span class="o">.</span><span class="n">appendChild</span><span class="p">(</span><span class="n">el</span><span class="p">)</span>
<span class="k">return</span> <span class="n">el</span></pre></div>
</div>
</div>
<div class='clearall'></div>
<div class='section' id='section-23'>
<div class='docs'>
<div class='octowrap'>
<a class='octothorpe' href='#section-23'>#</a>
</div>
<p>Sometimes we also need a &lt;[CDATA]&gt; block, for instance if we embed
CSS code in the SVG document.</p>
</div>
<div class='code'>
<div class="highlight"><pre> <span class="k">def</span> <span class="nf">cdata</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">data</span><span class="p">,</span> <span class="n">parent</span><span class="o">=</span><span class="bp">None</span><span class="p">):</span>
<span class="n">cd</span> <span class="o">=</span> <span class="n">minidom</span><span class="o">.</span><span class="n">CDATASection</span><span class="p">()</span>
<span class="n">cd</span><span class="o">.</span><span class="n">data</span> <span class="o">=</span> <span class="n">data</span>
<span class="k">if</span> <span class="n">parent</span> <span class="ow">is</span> <span class="ow">not</span> <span class="bp">None</span><span class="p">:</span>
<span class="n">parent</span><span class="o">.</span><span class="n">appendChild</span><span class="p">(</span><span class="n">cd</span><span class="p">)</span>
<span class="k">return</span> <span class="n">cd</span></pre></div>
</div>
</div>
<div class='clearall'></div>
<div class='section' id='section-24'>
<div class='docs'>
<div class='octowrap'>
<a class='octothorpe' href='#section-24'>#</a>
</div>
<p>Here we finally write the SVG file, and we're brave enough
to try to write it in Unicode.</p>
</div>
<div class='code'>
<div class="highlight"><pre> <span class="k">def</span> <span class="nf">write</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">outfile</span><span class="p">):</span>
<span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">outfile</span><span class="p">,</span> <span class="nb">str</span><span class="p">):</span>
<span class="n">outfile</span> <span class="o">=</span> <span class="nb">open</span><span class="p">(</span><span class="n">outfile</span><span class="p">,</span> <span class="s">&#39;w&#39;</span><span class="p">)</span>
<span class="n">raw</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">doc</span><span class="o">.</span><span class="n">toxml</span><span class="p">()</span>
<span class="k">try</span><span class="p">:</span>
<span class="n">raw</span> <span class="o">=</span> <span class="n">raw</span><span class="o">.</span><span class="n">encode</span><span class="p">(</span><span class="s">&#39;utf-8&#39;</span><span class="p">)</span>
<span class="k">except</span><span class="p">:</span>
<span class="k">print</span> <span class="s">&#39;warning: could not encode to unicode&#39;</span>
<span class="n">outfile</span><span class="o">.</span><span class="n">write</span><span class="p">(</span><span class="n">raw</span><span class="p">)</span>
<span class="n">outfile</span><span class="o">.</span><span class="n">close</span><span class="p">()</span></pre></div>
</div>
</div>
<div class='clearall'></div>
<div class='section' id='section-25'>
<div class='docs'>
<div class='octowrap'>
<a class='octothorpe' href='#section-25'>#</a>
</div>
<p>Don't blame me if you don't have a command-line shortcut to
simply the best free browser of the world.</p>
</div>
<div class='code'>
<div class="highlight"><pre> <span class="k">def</span> <span class="nf">preview</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">write</span><span class="p">(</span><span class="s">&#39;tmp.svg&#39;</span><span class="p">)</span>
<span class="kn">from</span> <span class="nn">subprocess</span> <span class="kn">import</span> <span class="n">call</span>
<span class="n">call</span><span class="p">([</span><span class="s">&quot;firefox&quot;</span><span class="p">,</span> <span class="s">&quot;tmp.svg&quot;</span><span class="p">])</span></pre></div>
</div>
</div>
<div class='clearall'></div>
<div class='section' id='section-26'>
<div class='docs'>
<div class='octowrap'>
<a class='octothorpe' href='#section-26'>#</a>
</div>
</div>
<div class='code'>
<div class="highlight"><pre> <span class="k">def</span> <span class="nf">tostring</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">doc</span><span class="o">.</span><span class="n">toxml</span><span class="p">()</span></pre></div>
</div>
</div>
<div class='clearall'></div>
<div class='section' id='section-27'>
<div class='docs'>
<div class='octowrap'>
<a class='octothorpe' href='#section-27'>#</a>
</div>
<p>This is an artifact of an older version of Kartograph, but
maybe we'll need it later. It will load an SVG document from
a file.</p>
</div>
<div class='code'>
<div class="highlight"><pre> <span class="nd">@staticmethod</span>
<span class="k">def</span> <span class="nf">load</span><span class="p">(</span><span class="n">filename</span><span class="p">):</span>
<span class="n">svg</span> <span class="o">=</span> <span class="n">SvgDocument</span><span class="p">()</span>
<span class="n">dom</span> <span class="o">=</span> <span class="n">parse</span><span class="p">(</span><span class="n">filename</span><span class="p">)</span>
<span class="n">svg</span><span class="o">.</span><span class="n">doc</span> <span class="o">=</span> <span class="n">dom</span>
<span class="n">svg</span><span class="o">.</span><span class="n">root</span> <span class="o">=</span> <span class="n">dom</span><span class="o">.</span><span class="n">getElementsByTagName</span><span class="p">(</span><span class="s">&#39;svg&#39;</span><span class="p">)[</span><span class="mi">0</span><span class="p">]</span>
<span class="k">return</span> <span class="n">svg</span>
<span class="k">def</span> <span class="nf">_add_attrs</span><span class="p">(</span><span class="n">node</span><span class="p">,</span> <span class="n">attrs</span><span class="p">):</span>
<span class="k">for</span> <span class="n">key</span> <span class="ow">in</span> <span class="n">attrs</span><span class="p">:</span>
<span class="n">node</span><span class="o">.</span><span class="n">setAttribute</span><span class="p">(</span><span class="n">key</span><span class="p">,</span> <span class="nb">str</span><span class="p">(</span><span class="n">attrs</span><span class="p">[</span><span class="n">key</span><span class="p">]))</span>
</pre></div>
</div>
</div>
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