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base.html
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base.html
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<!DOCTYPE html>
<html>
<head>
<meta http-equiv="content-type" content="text/html;charset=utf-8">
<title>base.py</title>
<link rel="stylesheet" href="../pycco.css">
</head>
<body>
<div id="background"></div>
<div id='container'>
<div class='section'>
<div class='docs'><h1>base.py</h1></div>
</div>
<div class='clearall'>
<div class='section' id='section-0'>
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<a class='octothorpe' href='#section-0'>#</a>
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<pre><code>kartograph - a svg mapping library
Copyright (C) 2011 Gregor Aisch
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as
published by the Free Software Foundation, either version 3 of the
License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
</code></pre>
</div>
<div class='code'>
<div class="highlight"><pre><span class="kn">import</span> <span class="nn">math</span>
<span class="kn">from</span> <span class="nn">kartograph.errors</span> <span class="kn">import</span> <span class="n">KartographError</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">LineString</span><span class="p">,</span> <span class="n">Point</span><span class="p">,</span> <span class="n">MultiPolygon</span><span class="p">,</span> <span class="n">MultiLineString</span><span class="p">,</span> <span class="n">MultiPoint</span></pre></div>
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<p>base class for projections</p>
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<div class='code'>
<div class="highlight"><pre><span class="k">class</span> <span class="nc">Proj</span><span class="p">(</span><span class="nb">object</span><span class="p">):</span></pre></div>
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<div class="highlight"><pre> <span class="n">HALFPI</span> <span class="o">=</span> <span class="n">math</span><span class="o">.</span><span class="n">pi</span> <span class="o">*</span> <span class="o">.</span><span class="mi">5</span>
<span class="n">QUARTERPI</span> <span class="o">=</span> <span class="n">math</span><span class="o">.</span><span class="n">pi</span> <span class="o">*</span> <span class="o">.</span><span class="mi">25</span>
<span class="n">minLat</span> <span class="o">=</span> <span class="o">-</span><span class="mi">90</span>
<span class="n">maxLat</span> <span class="o">=</span> <span class="mi">90</span>
<span class="n">minLon</span> <span class="o">=</span> <span class="o">-</span><span class="mi">180</span>
<span class="n">maxLon</span> <span class="o">=</span> <span class="mi">180</span></pre></div>
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<div class='code'>
<div class="highlight"><pre> <span class="k">def</span> <span class="nf">_shift_polygon</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">polygon</span><span class="p">):</span>
<span class="k">return</span> <span class="p">[</span><span class="n">polygon</span><span class="p">]</span> <span class="c"># no shifting</span></pre></div>
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<div class="highlight"><pre> <span class="k">def</span> <span class="nf">plot</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="n">geometries</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">'geoms'</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="n">res</span> <span class="o">=</span> <span class="p">[]</span></pre></div>
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<p>at first shift polygons
shifted = []
for geom in geometries:
if isinstance(geom, Polygon):
shifted += self._shift_polygon(geom)
else:
shifted += [geom]</p>
</div>
<div class='code'>
<div class="highlight"><pre> <span class="k">for</span> <span class="n">geom</span> <span class="ow">in</span> <span class="n">geometries</span><span class="p">:</span>
<span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">geom</span><span class="p">,</span> <span class="n">Polygon</span><span class="p">):</span>
<span class="n">res</span> <span class="o">+=</span> <span class="bp">self</span><span class="o">.</span><span class="n">plot_polygon</span><span class="p">(</span><span class="n">geom</span><span class="p">)</span>
<span class="k">elif</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">geom</span><span class="p">,</span> <span class="n">LineString</span><span class="p">):</span>
<span class="n">rings</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">plot_linear_ring</span><span class="p">(</span><span class="n">geom</span><span class="o">.</span><span class="n">coords</span><span class="p">)</span>
<span class="n">res</span> <span class="o">+=</span> <span class="nb">map</span><span class="p">(</span><span class="n">LineString</span><span class="p">,</span> <span class="n">rings</span><span class="p">)</span>
<span class="k">elif</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">geom</span><span class="p">,</span> <span class="n">Point</span><span class="p">):</span>
<span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">_visible</span><span class="p">(</span><span class="n">geom</span><span class="o">.</span><span class="n">x</span><span class="p">,</span> <span class="n">geom</span><span class="o">.</span><span class="n">y</span><span class="p">):</span>
<span class="n">x</span><span class="p">,</span> <span class="n">y</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">project</span><span class="p">(</span><span class="n">geom</span><span class="o">.</span><span class="n">x</span><span class="p">,</span> <span class="n">geom</span><span class="o">.</span><span class="n">y</span><span class="p">)</span>
<span class="n">res</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">Point</span><span class="p">(</span><span class="n">x</span><span class="p">,</span> <span class="n">y</span><span class="p">))</span>
<span class="k">else</span><span class="p">:</span>
<span class="k">pass</span></pre></div>
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<p>raise KartographError('proj.plot(): unknown geometry type %s' % geom)</p>
</div>
<div class='code'>
<div class="highlight"><pre> <span class="k">if</span> <span class="nb">len</span><span class="p">(</span><span class="n">res</span><span class="p">)</span> <span class="o">></span> <span class="mi">0</span><span class="p">:</span>
<span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">res</span><span class="p">[</span><span class="mi">0</span><span class="p">],</span> <span class="n">Polygon</span><span class="p">):</span>
<span class="k">if</span> <span class="nb">len</span><span class="p">(</span><span class="n">res</span><span class="p">)</span> <span class="o">></span> <span class="mi">1</span><span class="p">:</span>
<span class="k">return</span> <span class="n">MultiPolygon</span><span class="p">(</span><span class="n">res</span><span class="p">)</span>
<span class="k">else</span><span class="p">:</span>
<span class="k">return</span> <span class="n">res</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span>
<span class="k">elif</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">res</span><span class="p">[</span><span class="mi">0</span><span class="p">],</span> <span class="n">LineString</span><span class="p">):</span>
<span class="k">if</span> <span class="nb">len</span><span class="p">(</span><span class="n">res</span><span class="p">)</span> <span class="o">></span> <span class="mi">1</span><span class="p">:</span>
<span class="k">return</span> <span class="n">MultiLineString</span><span class="p">(</span><span class="n">res</span><span class="p">)</span>
<span class="k">else</span><span class="p">:</span>
<span class="k">return</span> <span class="n">LineString</span><span class="p">(</span><span class="n">res</span><span class="p">[</span><span class="mi">0</span><span class="p">])</span>
<span class="k">else</span><span class="p">:</span>
<span class="k">if</span> <span class="nb">len</span><span class="p">(</span><span class="n">res</span><span class="p">)</span> <span class="o">></span> <span class="mi">1</span><span class="p">:</span>
<span class="k">return</span> <span class="n">MultiPoint</span><span class="p">(</span><span class="n">res</span><span class="p">)</span>
<span class="k">else</span><span class="p">:</span>
<span class="k">return</span> <span class="n">Point</span><span class="p">(</span><span class="n">res</span><span class="p">[</span><span class="mi">0</span><span class="p">][</span><span class="mi">0</span><span class="p">],</span> <span class="n">res</span><span class="p">[</span><span class="mi">0</span><span class="p">][</span><span class="mi">1</span><span class="p">])</span></pre></div>
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<div class="highlight"><pre> <span class="k">def</span> <span class="nf">plot_polygon</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">polygon</span><span class="p">):</span>
<span class="n">ext</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">plot_linear_ring</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="n">truncate</span><span class="o">=</span><span class="bp">True</span><span class="p">)</span>
<span class="k">if</span> <span class="nb">len</span><span class="p">(</span><span class="n">ext</span><span class="p">)</span> <span class="o">==</span> <span class="mi">1</span><span class="p">:</span>
<span class="n">pts_int</span> <span class="o">=</span> <span class="p">[]</span>
<span class="k">for</span> <span class="n">interior</span> <span class="ow">in</span> <span class="n">polygon</span><span class="o">.</span><span class="n">interiors</span><span class="p">:</span>
<span class="n">pts_int</span> <span class="o">+=</span> <span class="bp">self</span><span class="o">.</span><span class="n">plot_linear_ring</span><span class="p">(</span><span class="n">interior</span><span class="p">,</span> <span class="n">truncate</span><span class="o">=</span><span class="bp">True</span><span class="p">)</span>
<span class="k">return</span> <span class="p">[</span><span class="n">Polygon</span><span class="p">(</span><span class="n">ext</span><span class="p">[</span><span class="mi">0</span><span class="p">],</span> <span class="n">pts_int</span><span class="p">)]</span>
<span class="k">elif</span> <span class="nb">len</span><span class="p">(</span><span class="n">ext</span><span class="p">)</span> <span class="o">==</span> <span class="mi">0</span><span class="p">:</span>
<span class="k">return</span> <span class="p">[]</span>
<span class="k">else</span><span class="p">:</span>
<span class="k">raise</span> <span class="n">KartographError</span><span class="p">(</span><span class="s">'unhandled case: exterior is split into multiple rings'</span><span class="p">)</span></pre></div>
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<div class="highlight"><pre> <span class="k">def</span> <span class="nf">plot_linear_ring</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">ring</span><span class="p">,</span> <span class="n">truncate</span><span class="o">=</span><span class="bp">False</span><span class="p">):</span>
<span class="n">ignore</span> <span class="o">=</span> <span class="bp">True</span>
<span class="n">points</span> <span class="o">=</span> <span class="p">[]</span>
<span class="k">for</span> <span class="p">(</span><span class="n">lon</span><span class="p">,</span> <span class="n">lat</span><span class="p">)</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">vis</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">_visible</span><span class="p">(</span><span class="n">lon</span><span class="p">,</span> <span class="n">lat</span><span class="p">)</span>
<span class="k">if</span> <span class="n">vis</span><span class="p">:</span>
<span class="n">ignore</span> <span class="o">=</span> <span class="bp">False</span>
<span class="n">x</span><span class="p">,</span> <span class="n">y</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">project</span><span class="p">(</span><span class="n">lon</span><span class="p">,</span> <span class="n">lat</span><span class="p">)</span>
<span class="k">if</span> <span class="ow">not</span> <span class="n">vis</span> <span class="ow">and</span> <span class="n">truncate</span><span class="p">:</span>
<span class="n">points</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_truncate</span><span class="p">(</span><span class="n">x</span><span class="p">,</span> <span class="n">y</span><span class="p">))</span>
<span class="k">else</span><span class="p">:</span>
<span class="n">points</span><span class="o">.</span><span class="n">append</span><span class="p">((</span><span class="n">x</span><span class="p">,</span> <span class="n">y</span><span class="p">))</span>
<span class="k">if</span> <span class="n">ignore</span><span class="p">:</span>
<span class="k">return</span> <span class="p">[]</span>
<span class="k">return</span> <span class="p">[</span><span class="n">points</span><span class="p">]</span></pre></div>
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<div class="highlight"><pre> <span class="k">def</span> <span class="nf">ll</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">lon</span><span class="p">,</span> <span class="n">lat</span><span class="p">):</span>
<span class="k">return</span> <span class="p">(</span><span class="n">lon</span><span class="p">,</span> <span class="n">lat</span><span class="p">)</span></pre></div>
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<div class="highlight"><pre> <span class="k">def</span> <span class="nf">project</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">lon</span><span class="p">,</span> <span class="n">lat</span><span class="p">):</span>
<span class="k">assert</span> <span class="bp">False</span><span class="p">,</span> <span class="s">'Proj is an abstract class'</span></pre></div>
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<div class="highlight"><pre> <span class="k">def</span> <span class="nf">project_inverse</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">x</span><span class="p">,</span> <span class="n">y</span><span class="p">):</span>
<span class="k">assert</span> <span class="bp">False</span><span class="p">,</span> <span class="s">'inverse projection is not supporte by </span><span class="si">%s</span><span class="s">'</span> <span class="o">%</span> <span class="bp">self</span><span class="o">.</span><span class="n">name</span></pre></div>
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<div class="highlight"><pre> <span class="k">def</span> <span class="nf">_visible</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">lon</span><span class="p">,</span> <span class="n">lat</span><span class="p">):</span>
<span class="k">assert</span> <span class="bp">False</span><span class="p">,</span> <span class="s">'Proj is an abstract class'</span></pre></div>
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<div class="highlight"><pre> <span class="k">def</span> <span class="nf">_truncate</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">x</span><span class="p">,</span> <span class="n">y</span><span class="p">):</span>
<span class="k">assert</span> <span class="bp">False</span><span class="p">,</span> <span class="s">'truncation is not implemented'</span></pre></div>
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<div class="highlight"><pre> <span class="k">def</span> <span class="nf">world_bounds</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">bbox</span><span class="p">,</span> <span class="n">llbbox</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="n">sea</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">sea_shape</span><span class="p">(</span><span class="n">llbbox</span><span class="p">)</span>
<span class="k">for</span> <span class="n">x</span><span class="p">,</span> <span class="n">y</span> <span class="ow">in</span> <span class="n">sea</span><span class="p">[</span><span class="mi">0</span><span class="p">]:</span>
<span class="n">bbox</span><span class="o">.</span><span class="n">update</span><span class="p">((</span><span class="n">x</span><span class="p">,</span> <span class="n">y</span><span class="p">))</span>
<span class="k">return</span> <span class="n">bbox</span></pre></div>
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<p>returns a WGS84 polygon that represents the limits of this projection
points that lie outside this polygon will not be plotted
this polygon will also be used to render the sea layer in world maps</p>
<p>defaults to full WGS84 range</p>
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<div class="highlight"><pre> <span class="k">def</span> <span class="nf">bounding_geometry</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">llbbox</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="n">projected</span><span class="o">=</span><span class="bp">False</span><span class="p">):</span></pre></div>
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<div class="highlight"><pre> <span class="kn">from</span> <span class="nn">shapely.geometry</span> <span class="kn">import</span> <span class="n">Polygon</span>
<span class="n">sea</span> <span class="o">=</span> <span class="p">[]</span>
<span class="n">minLon</span> <span class="o">=</span> <span class="n">llbbox</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span>
<span class="n">maxLon</span> <span class="o">=</span> <span class="n">llbbox</span><span class="p">[</span><span class="mi">2</span><span class="p">]</span>
<span class="n">minLat</span> <span class="o">=</span> <span class="nb">max</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">minLat</span><span class="p">,</span> <span class="n">llbbox</span><span class="p">[</span><span class="mi">1</span><span class="p">])</span>
<span class="n">maxLat</span> <span class="o">=</span> <span class="nb">min</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">maxLat</span><span class="p">,</span> <span class="n">llbbox</span><span class="p">[</span><span class="mi">3</span><span class="p">])</span></pre></div>
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<div class="highlight"><pre> <span class="k">def</span> <span class="nf">xfrange</span><span class="p">(</span><span class="n">start</span><span class="p">,</span> <span class="n">stop</span><span class="p">,</span> <span class="n">step</span><span class="p">):</span>
<span class="k">if</span> <span class="n">stop</span> <span class="o">></span> <span class="n">start</span><span class="p">:</span>
<span class="k">while</span> <span class="n">start</span> <span class="o"><</span> <span class="n">stop</span><span class="p">:</span>
<span class="k">yield</span> <span class="n">start</span>
<span class="n">start</span> <span class="o">+=</span> <span class="n">step</span>
<span class="k">else</span><span class="p">:</span>
<span class="k">while</span> <span class="n">stop</span> <span class="o"><</span> <span class="n">start</span><span class="p">:</span>
<span class="k">yield</span> <span class="n">start</span>
<span class="n">start</span> <span class="o">-=</span> <span class="n">step</span>
<span class="n">lat_step</span> <span class="o">=</span> <span class="nb">abs</span><span class="p">((</span><span class="n">maxLat</span> <span class="o">-</span> <span class="n">minLat</span><span class="p">)</span> <span class="o">/</span> <span class="mf">180.0</span><span class="p">)</span>
<span class="n">lon_step</span> <span class="o">=</span> <span class="nb">abs</span><span class="p">((</span><span class="n">maxLon</span> <span class="o">-</span> <span class="n">minLon</span><span class="p">)</span> <span class="o">/</span> <span class="mf">360.0</span><span class="p">)</span>
<span class="k">for</span> <span class="n">lat</span> <span class="ow">in</span> <span class="n">xfrange</span><span class="p">(</span><span class="n">minLat</span><span class="p">,</span> <span class="n">maxLat</span><span class="p">,</span> <span class="n">lat_step</span><span class="p">):</span>
<span class="n">sea</span><span class="o">.</span><span class="n">append</span><span class="p">((</span><span class="n">minLon</span><span class="p">,</span> <span class="n">lat</span><span class="p">))</span>
<span class="k">for</span> <span class="n">lon</span> <span class="ow">in</span> <span class="n">xfrange</span><span class="p">(</span><span class="n">minLon</span><span class="p">,</span> <span class="n">maxLon</span><span class="p">,</span> <span class="n">lon_step</span><span class="p">):</span>
<span class="n">sea</span><span class="o">.</span><span class="n">append</span><span class="p">((</span><span class="n">lon</span><span class="p">,</span> <span class="n">maxLat</span><span class="p">))</span>
<span class="k">for</span> <span class="n">lat</span> <span class="ow">in</span> <span class="n">xfrange</span><span class="p">(</span><span class="n">maxLat</span><span class="p">,</span> <span class="n">minLat</span><span class="p">,</span> <span class="n">lat_step</span><span class="p">):</span>
<span class="n">sea</span><span class="o">.</span><span class="n">append</span><span class="p">((</span><span class="n">maxLon</span><span class="p">,</span> <span class="n">lat</span><span class="p">))</span>
<span class="k">for</span> <span class="n">lon</span> <span class="ow">in</span> <span class="n">xfrange</span><span class="p">(</span><span class="n">maxLon</span><span class="p">,</span> <span class="n">minLon</span><span class="p">,</span> <span class="n">lon_step</span><span class="p">):</span>
<span class="n">sea</span><span class="o">.</span><span class="n">append</span><span class="p">((</span><span class="n">lon</span><span class="p">,</span> <span class="n">minLat</span><span class="p">))</span>
<span class="k">if</span> <span class="n">projected</span><span class="p">:</span>
<span class="n">sea</span> <span class="o">=</span> <span class="p">[</span><span class="bp">self</span><span class="o">.</span><span class="n">project</span><span class="p">(</span><span class="n">lon</span><span class="p">,</span> <span class="n">lat</span><span class="p">)</span> <span class="k">for</span> <span class="p">(</span><span class="n">lon</span><span class="p">,</span> <span class="n">lat</span><span class="p">)</span> <span class="ow">in</span> <span class="n">sea</span><span class="p">]</span>
<span class="k">return</span> <span class="n">Polygon</span><span class="p">(</span><span class="n">sea</span><span class="p">)</span></pre></div>
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<div class="highlight"><pre> <span class="k">def</span> <span class="nf">__str__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="k">return</span> <span class="s">'Proj('</span> <span class="o">+</span> <span class="bp">self</span><span class="o">.</span><span class="n">name</span> <span class="o">+</span> <span class="s">')'</span></pre></div>
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<div class="highlight"><pre> <span class="k">def</span> <span class="nf">attrs</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="k">return</span> <span class="nb">dict</span><span class="p">(</span><span class="nb">id</span><span class="o">=</span><span class="bp">self</span><span class="o">.</span><span class="n">name</span><span class="p">)</span></pre></div>
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<p>returns array of attribute names of this projection</p>
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<div class="highlight"><pre> <span class="nd">@staticmethod</span>
<span class="k">def</span> <span class="nf">attributes</span><span class="p">():</span></pre></div>
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<div class="highlight"><pre> <span class="k">return</span> <span class="p">[]</span></pre></div>
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<div class="highlight"><pre> <span class="nd">@staticmethod</span>
<span class="k">def</span> <span class="nf">fromXML</span><span class="p">(</span><span class="n">xml</span><span class="p">,</span> <span class="n">projections</span><span class="p">):</span>
<span class="nb">id</span> <span class="o">=</span> <span class="n">xml</span><span class="p">[</span><span class="s">'id'</span><span class="p">]</span>
<span class="k">if</span> <span class="nb">id</span> <span class="ow">in</span> <span class="n">projections</span><span class="p">:</span>
<span class="n">ProjClass</span> <span class="o">=</span> <span class="n">projections</span><span class="p">[</span><span class="nb">id</span><span class="p">]</span>
<span class="n">args</span> <span class="o">=</span> <span class="p">{}</span>
<span class="k">for</span> <span class="p">(</span><span class="n">prop</span><span class="p">,</span> <span class="n">val</span><span class="p">)</span> <span class="ow">in</span> <span class="n">xml</span><span class="p">:</span>
<span class="k">if</span> <span class="n">prop</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span> <span class="o">!=</span> <span class="s">"id"</span><span class="p">:</span>
<span class="n">args</span><span class="p">[</span><span class="n">prop</span><span class="p">[</span><span class="mi">0</span><span class="p">]]</span> <span class="o">=</span> <span class="nb">float</span><span class="p">(</span><span class="n">val</span><span class="p">)</span>
<span class="k">return</span> <span class="n">ProjClass</span><span class="p">(</span><span class="o">**</span><span class="n">args</span><span class="p">)</span>
<span class="k">raise</span> <span class="ne">Exception</span><span class="p">(</span><span class="s">"could not restore projection from xml"</span><span class="p">)</span>
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