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<a href="mapnik-module.html">Package&nbsp;mapnik</a> ::
Class&nbsp;Projection
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<!-- ==================== CLASS DESCRIPTION ==================== -->
<h1 class="epydoc">Class Projection</h1><p class="nomargin-top"></p>
<pre class="base-tree">
object --+
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??.instance --+
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<strong class="uidshort">Projection</strong>
</pre>
<dl><dt>Known Subclasses:</dt>
<dd>
<ul class="subclass-list">
<li class="private">_Projection</li><li>, <a href="mapnik.ogcserver.common.Projection-class.html">ogcserver.common.Projection</a></li> </ul>
</dd></dl>
<hr />
<p>Represents a map projection.</p>
<!-- ==================== INSTANCE METHODS ==================== -->
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<span class="table-header">Instance Methods</span></td>
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<span class="summary-type">&nbsp;</span>
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<td><span class="summary-sig"><a href="mapnik.Projection-class.html#__getinitargs__" class="summary-sig-name">__getinitargs__</a>(<span class="summary-sig-arg">...</span>)</span><br />
__getinitargs__( (Projection)arg1) -&gt; tuple :</td>
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<span class="summary-type">&nbsp;</span>
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<td><span class="summary-sig"><a href="mapnik.Projection-class.html#__init__" class="summary-sig-name">__init__</a>(<span class="summary-sig-arg">...</span>)</span><br />
__init__( (object)arg1 [, (str)proj4_string]) -&gt; None :
Constructs a new projection from its PROJ.4 string representation.</td>
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<span class="summary-type">&nbsp;</span>
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<td><span class="summary-sig"><a href="mapnik.Projection-class.html#__reduce__" class="summary-sig-name">__reduce__</a>(<span class="summary-sig-arg">...</span>)</span><br />
helper for pickle</td>
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<td><span class="summary-sig"><a href="mapnik.Projection-class.html#__repr__" class="summary-sig-name">__repr__</a>(<span class="summary-sig-arg">self</span>)</span><br />
repr(x)</td>
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<span class="summary-type">&nbsp;</span>
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<td><span class="summary-sig"><a href="mapnik.Projection-class.html#forward" class="summary-sig-name">forward</a>(<span class="summary-sig-arg">self</span>,
<span class="summary-sig-arg">obj</span>)</span><br />
Projects the given object (Envelope or Coord)
from the geographic space into the cartesian space.</td>
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<span class="summary-type">&nbsp;</span>
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<td><span class="summary-sig"><a href="mapnik.Projection-class.html#inverse" class="summary-sig-name">inverse</a>(<span class="summary-sig-arg">self</span>,
<span class="summary-sig-arg">obj</span>)</span><br />
Projects the given object (Envelope or Coord)
from the cartesian space into the geographic space.</td>
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</td>
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<span class="summary-type">&nbsp;</span>
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<td><span class="summary-sig"><a href="mapnik.Projection-class.html#params" class="summary-sig-name">params</a>(<span class="summary-sig-arg">...</span>)</span><br />
params( (Projection)arg1) -&gt; str :
Returns the PROJ.4 string for this projection.</td>
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<p class="indent-wrapped-lines"><b>Inherited from <code><i>unreachable</i>.instance</code></b>:
<code>__new__</code>
</p>
<p class="indent-wrapped-lines"><b>Inherited from <code>object</code></b>:
<code>__delattr__</code>,
<code>__getattribute__</code>,
<code>__hash__</code>,
<code>__reduce_ex__</code>,
<code>__setattr__</code>,
<code>__str__</code>
</p>
</td>
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<!-- ==================== CLASS VARIABLES ==================== -->
<a name="section-ClassVariables"></a>
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<span class="summary-type">&nbsp;</span>
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<a name="__instance_size__"></a><span class="summary-name">__instance_size__</span> = <code title="16">16</code>
</td>
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<span class="summary-type">&nbsp;</span>
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<a name="__safe_for_unpickling__"></a><span class="summary-name">__safe_for_unpickling__</span> = <code title="True">True</code>
</td>
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<!-- ==================== PROPERTIES ==================== -->
<a name="section-Properties"></a>
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<span class="summary-type">&nbsp;</span>
</td><td class="summary">
<a href="mapnik.Projection-class.html#geographic" class="summary-name">geographic</a><br />
This property is True if the projection is a geographic projection
(i.e.
</td>
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<p class="indent-wrapped-lines"><b>Inherited from <code>object</code></b>:
<code>__class__</code>
</p>
</td>
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<!-- ==================== METHOD DETAILS ==================== -->
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<a name="__getinitargs__"></a>
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<h3 class="epydoc"><span class="sig"><span class="sig-name">__getinitargs__</span>(<span class="sig-arg">...</span>)</span>
</h3>
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>&nbsp;
</td>
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<pre class="literalblock">
__getinitargs__( (Projection)arg1) -&gt; tuple :
C++ signature :
boost::python::tuple __getinitargs__(mapnik::projection)
</pre>
<dl class="fields">
</dl>
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<a name="__init__"></a>
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<h3 class="epydoc"><span class="sig"><span class="sig-name">__init__</span>(<span class="sig-arg">...</span>)</span>
<br /><em class="fname">(Constructor)</em>
</h3>
</td><td align="right" valign="top"
>&nbsp;
</td>
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<pre class="literalblock">
__init__( (object)arg1 [, (str)proj4_string]) -&gt; None :
Constructs a new projection from its PROJ.4 string representation.
The parameterless version of this constructor is equivalent to
Projection('+proj=latlong +ellps=WGS84')
The constructor will throw a RuntimeError in case the projection
cannot be initialized.
C++ signature :
void __init__(_object* [,std::string])
</pre>
<dl class="fields">
<dt>Overrides:
object.__init__
</dt>
</dl>
</td></tr></table>
</div>
<a name="__reduce__"></a>
<div>
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<h3 class="epydoc"><span class="sig"><span class="sig-name">__reduce__</span>(<span class="sig-arg">...</span>)</span>
</h3>
</td><td align="right" valign="top"
>&nbsp;
</td>
</tr></table>
<p>helper for pickle</p>
<dl class="fields">
<dt>Overrides:
object.__reduce__
<dd><em class="note">(inherited documentation)</em></dd>
</dt>
</dl>
</td></tr></table>
</div>
<a name="__repr__"></a>
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<h3 class="epydoc"><span class="sig"><span class="sig-name">__repr__</span>(<span class="sig-arg">self</span>)</span>
<br /><em class="fname">(Representation operator)</em>
</h3>
</td><td align="right" valign="top"
>&nbsp;
</td>
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<p>repr(x)</p>
<dl class="fields">
<dt>Overrides:
object.__repr__
<dd><em class="note">(inherited documentation)</em></dd>
</dt>
</dl>
</td></tr></table>
</div>
<a name="forward"></a>
<div>
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cellspacing="0" width="100%" bgcolor="white">
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<table width="100%" cellpadding="0" cellspacing="0" border="0">
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<h3 class="epydoc"><span class="sig"><span class="sig-name">forward</span>(<span class="sig-arg">self</span>,
<span class="sig-arg">obj</span>)</span>
</h3>
</td><td align="right" valign="top"
>&nbsp;
</td>
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<pre class="literalblock">
Projects the given object (Envelope or Coord)
from the geographic space into the cartesian space.
See also:
Envelope.forward(self, projection),
Coord.forward(self, projection).
</pre>
<dl class="fields">
</dl>
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</div>
<a name="inverse"></a>
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<h3 class="epydoc"><span class="sig"><span class="sig-name">inverse</span>(<span class="sig-arg">self</span>,
<span class="sig-arg">obj</span>)</span>
</h3>
</td><td align="right" valign="top"
>&nbsp;
</td>
</tr></table>
<pre class="literalblock">
Projects the given object (Envelope or Coord)
from the cartesian space into the geographic space.
See also:
Envelope.inverse(self, projection),
Coord.inverse(self, projection).
</pre>
<dl class="fields">
</dl>
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</div>
<a name="params"></a>
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<h3 class="epydoc"><span class="sig"><span class="sig-name">params</span>(<span class="sig-arg">...</span>)</span>
</h3>
</td><td align="right" valign="top"
>&nbsp;
</td>
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<pre class="literalblock">
params( (Projection)arg1) -&gt; str :
Returns the PROJ.4 string for this projection.
C++ signature :
std::string params(mapnik::projection {lvalue})
</pre>
<dl class="fields">
</dl>
</td></tr></table>
</div>
<br />
<!-- ==================== PROPERTY DETAILS ==================== -->
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<span class="table-header">Property Details</span></td>
</tr>
</table>
<a name="geographic"></a>
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cellspacing="0" width="100%" bgcolor="white">
<tr><td>
<h3 class="epydoc">geographic</h3>
<p>This property is True if the projection is a geographic projection
(i.e. it uses lon/lat coordinates)</p>
<dl class="fields">
<dt>Get Method:</dt>
<dd class="value"><span class="summary-sig"><i>unreachable</i>(<span class="summary-sig-arg">...</span>)</span>
</dd>
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