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  <div class="section" id="misc-example-code-svg-filter-line-py">
<span id="misc-svg-filter-line"></span><h1>misc example code: svg_filter_line.py<a class="headerlink" href="#misc-example-code-svg-filter-line-py" title="Permalink to this headline">ΒΆ</a></h1>
<p>[<a class="reference external" href="svg_filter_line.py">source code</a>]</p>
<div class="highlight-python"><div class="highlight"><pre><span class="sd">&quot;&quot;&quot;</span>
<span class="sd">Demonstrate SVG filtering effects which might be used with mpl.</span>

<span class="sd">Note that the filtering effects are only effective if your svg rederer</span>
<span class="sd">support it.</span>
<span class="sd">&quot;&quot;&quot;</span>

<span class="kn">import</span> <span class="nn">matplotlib</span>

<span class="n">matplotlib</span><span class="o">.</span><span class="n">use</span><span class="p">(</span><span class="s">&quot;Svg&quot;</span><span class="p">)</span>

<span class="kn">import</span> <span class="nn">matplotlib.pyplot</span> <span class="kn">as</span> <span class="nn">plt</span>
<span class="kn">import</span> <span class="nn">matplotlib.transforms</span> <span class="kn">as</span> <span class="nn">mtransforms</span>

<span class="n">fig1</span> <span class="o">=</span> <span class="n">plt</span><span class="o">.</span><span class="n">figure</span><span class="p">()</span>
<span class="n">ax</span> <span class="o">=</span> <span class="n">fig1</span><span class="o">.</span><span class="n">add_axes</span><span class="p">([</span><span class="mf">0.1</span><span class="p">,</span> <span class="mf">0.1</span><span class="p">,</span> <span class="mf">0.8</span><span class="p">,</span> <span class="mf">0.8</span><span class="p">])</span>

<span class="c"># draw lines</span>
<span class="n">l1</span><span class="p">,</span> <span class="o">=</span> <span class="n">ax</span><span class="o">.</span><span class="n">plot</span><span class="p">([</span><span class="mf">0.1</span><span class="p">,</span> <span class="mf">0.5</span><span class="p">,</span> <span class="mf">0.9</span><span class="p">],</span> <span class="p">[</span><span class="mf">0.1</span><span class="p">,</span> <span class="mf">0.9</span><span class="p">,</span> <span class="mf">0.5</span><span class="p">],</span> <span class="s">&quot;bo-&quot;</span><span class="p">,</span>
              <span class="n">mec</span><span class="o">=</span><span class="s">&quot;b&quot;</span><span class="p">,</span> <span class="n">lw</span><span class="o">=</span><span class="mi">5</span><span class="p">,</span> <span class="n">ms</span><span class="o">=</span><span class="mi">10</span><span class="p">,</span> <span class="n">label</span><span class="o">=</span><span class="s">&quot;Line 1&quot;</span><span class="p">)</span>
<span class="n">l2</span><span class="p">,</span> <span class="o">=</span> <span class="n">ax</span><span class="o">.</span><span class="n">plot</span><span class="p">([</span><span class="mf">0.1</span><span class="p">,</span> <span class="mf">0.5</span><span class="p">,</span> <span class="mf">0.9</span><span class="p">],</span> <span class="p">[</span><span class="mf">0.5</span><span class="p">,</span> <span class="mf">0.2</span><span class="p">,</span> <span class="mf">0.7</span><span class="p">],</span> <span class="s">&quot;rs-&quot;</span><span class="p">,</span>
              <span class="n">mec</span><span class="o">=</span><span class="s">&quot;r&quot;</span><span class="p">,</span> <span class="n">lw</span><span class="o">=</span><span class="mi">5</span><span class="p">,</span> <span class="n">ms</span><span class="o">=</span><span class="mi">10</span><span class="p">,</span> <span class="n">color</span><span class="o">=</span><span class="s">&quot;r&quot;</span><span class="p">,</span> <span class="n">label</span><span class="o">=</span><span class="s">&quot;Line 2&quot;</span><span class="p">)</span>


<span class="k">for</span> <span class="n">l</span> <span class="ow">in</span> <span class="p">[</span><span class="n">l1</span><span class="p">,</span> <span class="n">l2</span><span class="p">]:</span>

    <span class="c"># draw shadows with same lines with slight offset and gray colors.</span>

    <span class="n">xx</span> <span class="o">=</span> <span class="n">l</span><span class="o">.</span><span class="n">get_xdata</span><span class="p">()</span>
    <span class="n">yy</span> <span class="o">=</span> <span class="n">l</span><span class="o">.</span><span class="n">get_ydata</span><span class="p">()</span>
    <span class="n">shadow</span><span class="p">,</span> <span class="o">=</span> <span class="n">ax</span><span class="o">.</span><span class="n">plot</span><span class="p">(</span><span class="n">xx</span><span class="p">,</span> <span class="n">yy</span><span class="p">)</span>
    <span class="n">shadow</span><span class="o">.</span><span class="n">update_from</span><span class="p">(</span><span class="n">l</span><span class="p">)</span>

    <span class="c"># adjust color</span>
    <span class="n">shadow</span><span class="o">.</span><span class="n">set_color</span><span class="p">(</span><span class="s">&quot;0.2&quot;</span><span class="p">)</span>
    <span class="c"># adjust zorder of the shadow lines so that it is drawn below the</span>
    <span class="c"># original lines</span>
    <span class="n">shadow</span><span class="o">.</span><span class="n">set_zorder</span><span class="p">(</span><span class="n">l</span><span class="o">.</span><span class="n">get_zorder</span><span class="p">()</span><span class="o">-</span><span class="mf">0.5</span><span class="p">)</span>

    <span class="c"># offset transform</span>
    <span class="n">ot</span> <span class="o">=</span> <span class="n">mtransforms</span><span class="o">.</span><span class="n">offset_copy</span><span class="p">(</span><span class="n">l</span><span class="o">.</span><span class="n">get_transform</span><span class="p">(),</span> <span class="n">fig1</span><span class="p">,</span>
                                 <span class="n">x</span><span class="o">=</span><span class="mf">4.0</span><span class="p">,</span> <span class="n">y</span><span class="o">=-</span><span class="mf">6.0</span><span class="p">,</span> <span class="n">units</span><span class="o">=</span><span class="s">&#39;points&#39;</span><span class="p">)</span>

    <span class="n">shadow</span><span class="o">.</span><span class="n">set_transform</span><span class="p">(</span><span class="n">ot</span><span class="p">)</span>

    <span class="c"># set the id for a later use</span>
    <span class="n">shadow</span><span class="o">.</span><span class="n">set_gid</span><span class="p">(</span><span class="n">l</span><span class="o">.</span><span class="n">get_label</span><span class="p">()</span><span class="o">+</span><span class="s">&quot;_shadow&quot;</span><span class="p">)</span>


<span class="n">ax</span><span class="o">.</span><span class="n">set_xlim</span><span class="p">(</span><span class="mf">0.</span><span class="p">,</span> <span class="mf">1.</span><span class="p">)</span>
<span class="n">ax</span><span class="o">.</span><span class="n">set_ylim</span><span class="p">(</span><span class="mf">0.</span><span class="p">,</span> <span class="mf">1.</span><span class="p">)</span>

<span class="c"># save the figure as a string in the svg format.</span>
<span class="kn">from</span> <span class="nn">StringIO</span> <span class="kn">import</span> <span class="n">StringIO</span>
<span class="n">f</span> <span class="o">=</span> <span class="n">StringIO</span><span class="p">()</span>
<span class="n">plt</span><span class="o">.</span><span class="n">savefig</span><span class="p">(</span><span class="n">f</span><span class="p">,</span> <span class="n">format</span><span class="o">=</span><span class="s">&quot;svg&quot;</span><span class="p">)</span>


<span class="kn">import</span> <span class="nn">xml.etree.cElementTree</span> <span class="kn">as</span> <span class="nn">ET</span>

<span class="c"># filter definition for a gaussian blur</span>
<span class="n">filter_def</span> <span class="o">=</span> <span class="s">&quot;&quot;&quot;</span>
<span class="s">  &lt;defs  xmlns=&#39;http://www.w3.org/2000/svg&#39; xmlns:xlink=&#39;http://www.w3.org/1999/xlink&#39;&gt;</span>
<span class="s">    &lt;filter id=&#39;dropshadow&#39; height=&#39;1.2&#39; width=&#39;1.2&#39;&gt;</span>
<span class="s">      &lt;feGaussianBlur result=&#39;blur&#39; stdDeviation=&#39;3&#39;/&gt;</span>
<span class="s">    &lt;/filter&gt;</span>
<span class="s">  &lt;/defs&gt;</span>
<span class="s">&quot;&quot;&quot;</span>


<span class="c"># read in the saved svg</span>
<span class="n">tree</span><span class="p">,</span> <span class="n">xmlid</span> <span class="o">=</span> <span class="n">ET</span><span class="o">.</span><span class="n">XMLID</span><span class="p">(</span><span class="n">f</span><span class="o">.</span><span class="n">getvalue</span><span class="p">())</span>

<span class="c"># insert the filter definition in the svg dom tree.</span>
<span class="n">tree</span><span class="o">.</span><span class="n">insert</span><span class="p">(</span><span class="mi">0</span><span class="p">,</span> <span class="n">ET</span><span class="o">.</span><span class="n">XML</span><span class="p">(</span><span class="n">filter_def</span><span class="p">))</span>

<span class="k">for</span> <span class="n">l</span> <span class="ow">in</span> <span class="p">[</span><span class="n">l1</span><span class="p">,</span> <span class="n">l2</span><span class="p">]:</span>
    <span class="c"># pick up the svg element with given id</span>
    <span class="n">shadow</span> <span class="o">=</span> <span class="n">xmlid</span><span class="p">[</span><span class="n">l</span><span class="o">.</span><span class="n">get_label</span><span class="p">()</span><span class="o">+</span><span class="s">&quot;_shadow&quot;</span><span class="p">]</span>
    <span class="c"># apply shdow filter</span>
    <span class="n">shadow</span><span class="o">.</span><span class="n">set</span><span class="p">(</span><span class="s">&quot;filter&quot;</span><span class="p">,</span><span class="s">&#39;url(#dropshadow)&#39;</span><span class="p">)</span>

<span class="n">fn</span> <span class="o">=</span> <span class="s">&quot;svg_filter_line.svg&quot;</span>
<span class="k">print</span> <span class="s">&quot;Saving &#39;</span><span class="si">%s</span><span class="s">&#39;&quot;</span> <span class="o">%</span> <span class="n">fn</span>
<span class="n">ET</span><span class="o">.</span><span class="n">ElementTree</span><span class="p">(</span><span class="n">tree</span><span class="p">)</span><span class="o">.</span><span class="n">write</span><span class="p">(</span><span class="n">fn</span><span class="p">)</span>
</pre></div>
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<p>Keywords: python, matplotlib, pylab, example, codex (see <a class="reference internal" href="../../faq/howto_faq.html#how-to-search-examples"><em>Search examples</em></a>)</p>
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