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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
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<h1>Source code for matplotlib.patheffects</h1><div class="highlight"><pre>
<span></span><span class="sd">"""</span>
<span class="sd">Defines classes for path effects. The path effects are supported in</span>
<span class="sd">:class:`~matplotlib.text.Text`, :class:`~matplotlib.lines.Line2D`</span>
<span class="sd">and :class:`~matplotlib.patches.Patch`.</span>
<span class="sd">"""</span>
<span class="kn">from</span> <span class="nn">__future__</span> <span class="k">import</span> <span class="p">(</span><span class="n">absolute_import</span><span class="p">,</span> <span class="n">division</span><span class="p">,</span> <span class="n">print_function</span><span class="p">,</span>
<span class="n">unicode_literals</span><span class="p">)</span>
<span class="kn">import</span> <span class="nn">six</span>
<span class="kn">from</span> <span class="nn">matplotlib.backend_bases</span> <span class="k">import</span> <span class="n">RendererBase</span>
<span class="kn">from</span> <span class="nn">matplotlib</span> <span class="k">import</span> <span class="n">colors</span> <span class="k">as</span> <span class="n">mcolors</span>
<span class="kn">from</span> <span class="nn">matplotlib</span> <span class="k">import</span> <span class="n">patches</span> <span class="k">as</span> <span class="n">mpatches</span>
<span class="kn">from</span> <span class="nn">matplotlib</span> <span class="k">import</span> <span class="n">transforms</span> <span class="k">as</span> <span class="n">mtransforms</span>
<div class="viewcode-block" id="AbstractPathEffect"><a class="viewcode-back" href="../../api/patheffects_api.html#matplotlib.patheffects.AbstractPathEffect">[docs]</a><span class="k">class</span> <span class="nc">AbstractPathEffect</span><span class="p">(</span><span class="nb">object</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> A base class for path effects.</span>
<span class="sd"> Subclasses should override the ``draw_path`` method to add effect</span>
<span class="sd"> functionality.</span>
<span class="sd"> """</span>
<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="n">offset</span><span class="o">=</span><span class="p">(</span><span class="mf">0.</span><span class="p">,</span> <span class="mf">0.</span><span class="p">)):</span>
<span class="sd">"""</span>
<span class="sd"> Parameters</span>
<span class="sd"> ----------</span>
<span class="sd"> offset : pair of floats</span>
<span class="sd"> The offset to apply to the path, measured in points.</span>
<span class="sd"> """</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_offset</span> <span class="o">=</span> <span class="n">offset</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_offset_trans</span> <span class="o">=</span> <span class="n">mtransforms</span><span class="o">.</span><span class="n">Affine2D</span><span class="p">()</span>
<span class="k">def</span> <span class="nf">_offset_transform</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">renderer</span><span class="p">,</span> <span class="n">transform</span><span class="p">):</span>
<span class="sd">"""Apply the offset to the given transform."""</span>
<span class="n">offset_x</span> <span class="o">=</span> <span class="n">renderer</span><span class="o">.</span><span class="n">points_to_pixels</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_offset</span><span class="p">[</span><span class="mi">0</span><span class="p">])</span>
<span class="n">offset_y</span> <span class="o">=</span> <span class="n">renderer</span><span class="o">.</span><span class="n">points_to_pixels</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_offset</span><span class="p">[</span><span class="mi">1</span><span class="p">])</span>
<span class="k">return</span> <span class="n">transform</span> <span class="o">+</span> <span class="bp">self</span><span class="o">.</span><span class="n">_offset_trans</span><span class="o">.</span><span class="n">clear</span><span class="p">()</span><span class="o">.</span><span class="n">translate</span><span class="p">(</span><span class="n">offset_x</span><span class="p">,</span>
<span class="n">offset_y</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">_update_gc</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">gc</span><span class="p">,</span> <span class="n">new_gc_dict</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Update the given GraphicsCollection with the given</span>
<span class="sd"> dictionary of properties. The keys in the dictionary are used to</span>
<span class="sd"> identify the appropriate set_ method on the gc.</span>
<span class="sd"> """</span>
<span class="n">new_gc_dict</span> <span class="o">=</span> <span class="n">new_gc_dict</span><span class="o">.</span><span class="n">copy</span><span class="p">()</span>
<span class="n">dashes</span> <span class="o">=</span> <span class="n">new_gc_dict</span><span class="o">.</span><span class="n">pop</span><span class="p">(</span><span class="s2">"dashes"</span><span class="p">,</span> <span class="kc">None</span><span class="p">)</span>
<span class="k">if</span> <span class="n">dashes</span><span class="p">:</span>
<span class="n">gc</span><span class="o">.</span><span class="n">set_dashes</span><span class="p">(</span><span class="o">**</span><span class="n">dashes</span><span class="p">)</span>
<span class="k">for</span> <span class="n">k</span><span class="p">,</span> <span class="n">v</span> <span class="ow">in</span> <span class="n">six</span><span class="o">.</span><span class="n">iteritems</span><span class="p">(</span><span class="n">new_gc_dict</span><span class="p">):</span>
<span class="n">set_method</span> <span class="o">=</span> <span class="nb">getattr</span><span class="p">(</span><span class="n">gc</span><span class="p">,</span> <span class="s1">'set_'</span> <span class="o">+</span> <span class="n">k</span><span class="p">,</span> <span class="kc">None</span><span class="p">)</span>
<span class="k">if</span> <span class="ow">not</span> <span class="n">callable</span><span class="p">(</span><span class="n">set_method</span><span class="p">):</span>
<span class="k">raise</span> <span class="ne">AttributeError</span><span class="p">(</span><span class="s1">'Unknown property </span><span class="si">{0}</span><span class="s1">'</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="n">k</span><span class="p">))</span>
<span class="n">set_method</span><span class="p">(</span><span class="n">v</span><span class="p">)</span>
<span class="k">return</span> <span class="n">gc</span>
<div class="viewcode-block" id="AbstractPathEffect.draw_path"><a class="viewcode-back" href="../../api/patheffects_api.html#matplotlib.patheffects.AbstractPathEffect.draw_path">[docs]</a> <span class="k">def</span> <span class="nf">draw_path</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">renderer</span><span class="p">,</span> <span class="n">gc</span><span class="p">,</span> <span class="n">tpath</span><span class="p">,</span> <span class="n">affine</span><span class="p">,</span> <span class="n">rgbFace</span><span class="o">=</span><span class="kc">None</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Derived should override this method. The arguments are the same</span>
<span class="sd"> as :meth:`matplotlib.backend_bases.RendererBase.draw_path`</span>
<span class="sd"> except the first argument is a renderer.</span>
<span class="sd"> """</span>
<span class="c1"># Get the real renderer, not a PathEffectRenderer.</span>
<span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">renderer</span><span class="p">,</span> <span class="n">PathEffectRenderer</span><span class="p">):</span>
<span class="n">renderer</span> <span class="o">=</span> <span class="n">renderer</span><span class="o">.</span><span class="n">_renderer</span>
<span class="k">return</span> <span class="n">renderer</span><span class="o">.</span><span class="n">draw_path</span><span class="p">(</span><span class="n">gc</span><span class="p">,</span> <span class="n">tpath</span><span class="p">,</span> <span class="n">affine</span><span class="p">,</span> <span class="n">rgbFace</span><span class="p">)</span></div></div>
<div class="viewcode-block" id="PathEffectRenderer"><a class="viewcode-back" href="../../api/patheffects_api.html#matplotlib.patheffects.PathEffectRenderer">[docs]</a><span class="k">class</span> <span class="nc">PathEffectRenderer</span><span class="p">(</span><span class="n">RendererBase</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Implements a Renderer which contains another renderer.</span>
<span class="sd"> This proxy then intercepts draw calls, calling the appropriate</span>
<span class="sd"> :class:`AbstractPathEffect` draw method.</span>
<span class="sd"> .. note::</span>
<span class="sd"> Not all methods have been overridden on this RendererBase subclass.</span>
<span class="sd"> It may be necessary to add further methods to extend the PathEffects</span>
<span class="sd"> capabilities further.</span>
<span class="sd"> """</span>
<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="n">path_effects</span><span class="p">,</span> <span class="n">renderer</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Parameters</span>
<span class="sd"> ----------</span>
<span class="sd"> path_effects : iterable of :class:`AbstractPathEffect`</span>
<span class="sd"> The path effects which this renderer represents.</span>
<span class="sd"> renderer : :class:`matplotlib.backend_bases.RendererBase` instance</span>
<span class="sd"> """</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_path_effects</span> <span class="o">=</span> <span class="n">path_effects</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_renderer</span> <span class="o">=</span> <span class="n">renderer</span>
<div class="viewcode-block" id="PathEffectRenderer.new_gc"><a class="viewcode-back" href="../../api/patheffects_api.html#matplotlib.patheffects.PathEffectRenderer.new_gc">[docs]</a> <span class="k">def</span> <span class="nf">new_gc</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">_renderer</span><span class="o">.</span><span class="n">new_gc</span><span class="p">()</span></div>
<div class="viewcode-block" id="PathEffectRenderer.copy_with_path_effect"><a class="viewcode-back" href="../../api/patheffects_api.html#matplotlib.patheffects.PathEffectRenderer.copy_with_path_effect">[docs]</a> <span class="k">def</span> <span class="nf">copy_with_path_effect</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">path_effects</span><span class="p">):</span>
<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="vm">__class__</span><span class="p">(</span><span class="n">path_effects</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">_renderer</span><span class="p">)</span></div>
<div class="viewcode-block" id="PathEffectRenderer.draw_path"><a class="viewcode-back" href="../../api/patheffects_api.html#matplotlib.patheffects.PathEffectRenderer.draw_path">[docs]</a> <span class="k">def</span> <span class="nf">draw_path</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">gc</span><span class="p">,</span> <span class="n">tpath</span><span class="p">,</span> <span class="n">affine</span><span class="p">,</span> <span class="n">rgbFace</span><span class="o">=</span><span class="kc">None</span><span class="p">):</span>
<span class="k">for</span> <span class="n">path_effect</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">_path_effects</span><span class="p">:</span>
<span class="n">path_effect</span><span class="o">.</span><span class="n">draw_path</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_renderer</span><span class="p">,</span> <span class="n">gc</span><span class="p">,</span> <span class="n">tpath</span><span class="p">,</span> <span class="n">affine</span><span class="p">,</span>
<span class="n">rgbFace</span><span class="p">)</span></div>
<div class="viewcode-block" id="PathEffectRenderer.draw_markers"><a class="viewcode-back" href="../../api/patheffects_api.html#matplotlib.patheffects.PathEffectRenderer.draw_markers">[docs]</a> <span class="k">def</span> <span class="nf">draw_markers</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">gc</span><span class="p">,</span> <span class="n">marker_path</span><span class="p">,</span> <span class="n">marker_trans</span><span class="p">,</span> <span class="n">path</span><span class="p">,</span> <span class="o">*</span><span class="n">args</span><span class="p">,</span>
<span class="o">**</span><span class="n">kwargs</span><span class="p">):</span>
<span class="c1"># We do a little shimmy so that all markers are drawn for each path</span>
<span class="c1"># effect in turn. Essentially, we induce recursion (depth 1) which is</span>
<span class="c1"># terminated once we have just a single path effect to work with.</span>
<span class="k">if</span> <span class="nb">len</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_path_effects</span><span class="p">)</span> <span class="o">==</span> <span class="mi">1</span><span class="p">:</span>
<span class="c1"># Call the base path effect function - this uses the unoptimised</span>
<span class="c1"># approach of calling "draw_path" multiple times.</span>
<span class="k">return</span> <span class="n">RendererBase</span><span class="o">.</span><span class="n">draw_markers</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">gc</span><span class="p">,</span> <span class="n">marker_path</span><span class="p">,</span>
<span class="n">marker_trans</span><span class="p">,</span> <span class="n">path</span><span class="p">,</span> <span class="o">*</span><span class="n">args</span><span class="p">,</span>
<span class="o">**</span><span class="n">kwargs</span><span class="p">)</span>
<span class="k">for</span> <span class="n">path_effect</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">_path_effects</span><span class="p">:</span>
<span class="n">renderer</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">copy_with_path_effect</span><span class="p">([</span><span class="n">path_effect</span><span class="p">])</span>
<span class="c1"># Recursively call this method, only next time we will only have</span>
<span class="c1"># one path effect.</span>
<span class="n">renderer</span><span class="o">.</span><span class="n">draw_markers</span><span class="p">(</span><span class="n">gc</span><span class="p">,</span> <span class="n">marker_path</span><span class="p">,</span> <span class="n">marker_trans</span><span class="p">,</span> <span class="n">path</span><span class="p">,</span>
<span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">)</span></div>
<div class="viewcode-block" id="PathEffectRenderer.draw_path_collection"><a class="viewcode-back" href="../../api/patheffects_api.html#matplotlib.patheffects.PathEffectRenderer.draw_path_collection">[docs]</a> <span class="k">def</span> <span class="nf">draw_path_collection</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">gc</span><span class="p">,</span> <span class="n">master_transform</span><span class="p">,</span> <span class="n">paths</span><span class="p">,</span> <span class="o">*</span><span class="n">args</span><span class="p">,</span>
<span class="o">**</span><span class="n">kwargs</span><span class="p">):</span>
<span class="c1"># We do a little shimmy so that all paths are drawn for each path</span>
<span class="c1"># effect in turn. Essentially, we induce recursion (depth 1) which is</span>
<span class="c1"># terminated once we have just a single path effect to work with.</span>
<span class="k">if</span> <span class="nb">len</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_path_effects</span><span class="p">)</span> <span class="o">==</span> <span class="mi">1</span><span class="p">:</span>
<span class="c1"># Call the base path effect function - this uses the unoptimised</span>
<span class="c1"># approach of calling "draw_path" multiple times.</span>
<span class="k">return</span> <span class="n">RendererBase</span><span class="o">.</span><span class="n">draw_path_collection</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">gc</span><span class="p">,</span>
<span class="n">master_transform</span><span class="p">,</span> <span class="n">paths</span><span class="p">,</span>
<span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">)</span>
<span class="k">for</span> <span class="n">path_effect</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">_path_effects</span><span class="p">:</span>
<span class="n">renderer</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">copy_with_path_effect</span><span class="p">([</span><span class="n">path_effect</span><span class="p">])</span>
<span class="c1"># Recursively call this method, only next time we will only have</span>
<span class="c1"># one path effect.</span>
<span class="n">renderer</span><span class="o">.</span><span class="n">draw_path_collection</span><span class="p">(</span><span class="n">gc</span><span class="p">,</span> <span class="n">master_transform</span><span class="p">,</span> <span class="n">paths</span><span class="p">,</span>
<span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">)</span></div>
<div class="viewcode-block" id="PathEffectRenderer.points_to_pixels"><a class="viewcode-back" href="../../api/patheffects_api.html#matplotlib.patheffects.PathEffectRenderer.points_to_pixels">[docs]</a> <span class="k">def</span> <span class="nf">points_to_pixels</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">points</span><span class="p">):</span>
<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">_renderer</span><span class="o">.</span><span class="n">points_to_pixels</span><span class="p">(</span><span class="n">points</span><span class="p">)</span></div>
<span class="k">def</span> <span class="nf">_draw_text_as_path</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">gc</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="n">s</span><span class="p">,</span> <span class="n">prop</span><span class="p">,</span> <span class="n">angle</span><span class="p">,</span> <span class="n">ismath</span><span class="p">):</span>
<span class="c1"># Implements the naive text drawing as is found in RendererBase.</span>
<span class="n">path</span><span class="p">,</span> <span class="n">transform</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">_get_text_path_transform</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="n">s</span><span class="p">,</span> <span class="n">prop</span><span class="p">,</span>
<span class="n">angle</span><span class="p">,</span> <span class="n">ismath</span><span class="p">)</span>
<span class="n">color</span> <span class="o">=</span> <span class="n">gc</span><span class="o">.</span><span class="n">get_rgb</span><span class="p">()</span>
<span class="n">gc</span><span class="o">.</span><span class="n">set_linewidth</span><span class="p">(</span><span class="mf">0.0</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">draw_path</span><span class="p">(</span><span class="n">gc</span><span class="p">,</span> <span class="n">path</span><span class="p">,</span> <span class="n">transform</span><span class="p">,</span> <span class="n">rgbFace</span><span class="o">=</span><span class="n">color</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">__getattribute__</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="k">if</span> <span class="n">name</span> <span class="ow">in</span> <span class="p">[</span><span class="s1">'_text2path'</span><span class="p">,</span> <span class="s1">'flipy'</span><span class="p">,</span> <span class="s1">'height'</span><span class="p">,</span> <span class="s1">'width'</span><span class="p">]:</span>
<span class="k">return</span> <span class="nb">getattr</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_renderer</span><span class="p">,</span> <span class="n">name</span><span class="p">)</span>
<span class="k">else</span><span class="p">:</span>
<span class="k">return</span> <span class="nb">object</span><span class="o">.</span><span class="fm">__getattribute__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">name</span><span class="p">)</span></div>
<div class="viewcode-block" id="Normal"><a class="viewcode-back" href="../../api/patheffects_api.html#matplotlib.patheffects.Normal">[docs]</a><span class="k">class</span> <span class="nc">Normal</span><span class="p">(</span><span class="n">AbstractPathEffect</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> The "identity" PathEffect.</span>
<span class="sd"> The Normal PathEffect's sole purpose is to draw the original artist with</span>
<span class="sd"> no special path effect.</span>
<span class="sd"> """</span>
<span class="k">pass</span></div>
<div class="viewcode-block" id="Stroke"><a class="viewcode-back" href="../../api/patheffects_api.html#matplotlib.patheffects.Stroke">[docs]</a><span class="k">class</span> <span class="nc">Stroke</span><span class="p">(</span><span class="n">AbstractPathEffect</span><span class="p">):</span>
<span class="sd">"""A line based PathEffect which re-draws a stroke."""</span>
<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="n">offset</span><span class="o">=</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="o">**</span><span class="n">kwargs</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> The path will be stroked with its gc updated with the given</span>
<span class="sd"> keyword arguments, i.e., the keyword arguments should be valid</span>
<span class="sd"> gc parameter values.</span>
<span class="sd"> """</span>
<span class="nb">super</span><span class="p">(</span><span class="n">Stroke</span><span class="p">,</span> <span class="bp">self</span><span class="p">)</span><span class="o">.</span><span class="fm">__init__</span><span class="p">(</span><span class="n">offset</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_gc</span> <span class="o">=</span> <span class="n">kwargs</span>
<div class="viewcode-block" id="Stroke.draw_path"><a class="viewcode-back" href="../../api/patheffects_api.html#matplotlib.patheffects.Stroke.draw_path">[docs]</a> <span class="k">def</span> <span class="nf">draw_path</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">renderer</span><span class="p">,</span> <span class="n">gc</span><span class="p">,</span> <span class="n">tpath</span><span class="p">,</span> <span class="n">affine</span><span class="p">,</span> <span class="n">rgbFace</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> draw the path with updated gc.</span>
<span class="sd"> """</span>
<span class="c1"># Do not modify the input! Use copy instead.</span>
<span class="n">gc0</span> <span class="o">=</span> <span class="n">renderer</span><span class="o">.</span><span class="n">new_gc</span><span class="p">()</span>
<span class="n">gc0</span><span class="o">.</span><span class="n">copy_properties</span><span class="p">(</span><span class="n">gc</span><span class="p">)</span>
<span class="n">gc0</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">_update_gc</span><span class="p">(</span><span class="n">gc0</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">_gc</span><span class="p">)</span>
<span class="n">trans</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">_offset_transform</span><span class="p">(</span><span class="n">renderer</span><span class="p">,</span> <span class="n">affine</span><span class="p">)</span>
<span class="n">renderer</span><span class="o">.</span><span class="n">draw_path</span><span class="p">(</span><span class="n">gc0</span><span class="p">,</span> <span class="n">tpath</span><span class="p">,</span> <span class="n">trans</span><span class="p">,</span> <span class="n">rgbFace</span><span class="p">)</span>
<span class="n">gc0</span><span class="o">.</span><span class="n">restore</span><span class="p">()</span></div></div>
<div class="viewcode-block" id="withStroke"><a class="viewcode-back" href="../../api/patheffects_api.html#matplotlib.patheffects.withStroke">[docs]</a><span class="k">class</span> <span class="nc">withStroke</span><span class="p">(</span><span class="n">Stroke</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Adds a simple :class:`Stroke` and then draws the</span>
<span class="sd"> original Artist to avoid needing to call :class:`Normal`.</span>
<span class="sd"> """</span>
<div class="viewcode-block" id="withStroke.draw_path"><a class="viewcode-back" href="../../api/patheffects_api.html#matplotlib.patheffects.withStroke.draw_path">[docs]</a> <span class="k">def</span> <span class="nf">draw_path</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">renderer</span><span class="p">,</span> <span class="n">gc</span><span class="p">,</span> <span class="n">tpath</span><span class="p">,</span> <span class="n">affine</span><span class="p">,</span> <span class="n">rgbFace</span><span class="p">):</span>
<span class="n">Stroke</span><span class="o">.</span><span class="n">draw_path</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">renderer</span><span class="p">,</span> <span class="n">gc</span><span class="p">,</span> <span class="n">tpath</span><span class="p">,</span> <span class="n">affine</span><span class="p">,</span> <span class="n">rgbFace</span><span class="p">)</span>
<span class="n">renderer</span><span class="o">.</span><span class="n">draw_path</span><span class="p">(</span><span class="n">gc</span><span class="p">,</span> <span class="n">tpath</span><span class="p">,</span> <span class="n">affine</span><span class="p">,</span> <span class="n">rgbFace</span><span class="p">)</span></div></div>
<div class="viewcode-block" id="SimplePatchShadow"><a class="viewcode-back" href="../../api/patheffects_api.html#matplotlib.patheffects.SimplePatchShadow">[docs]</a><span class="k">class</span> <span class="nc">SimplePatchShadow</span><span class="p">(</span><span class="n">AbstractPathEffect</span><span class="p">):</span>
<span class="sd">"""A simple shadow via a filled patch."""</span>
<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="n">offset</span><span class="o">=</span><span class="p">(</span><span class="mi">2</span><span class="p">,</span> <span class="o">-</span><span class="mi">2</span><span class="p">),</span>
<span class="n">shadow_rgbFace</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span> <span class="n">alpha</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span>
<span class="n">rho</span><span class="o">=</span><span class="mf">0.3</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Parameters</span>
<span class="sd"> ----------</span>
<span class="sd"> offset : pair of floats</span>
<span class="sd"> The offset of the shadow in points.</span>
<span class="sd"> shadow_rgbFace : color</span>
<span class="sd"> The shadow color.</span>
<span class="sd"> alpha : float</span>
<span class="sd"> The alpha transparency of the created shadow patch.</span>
<span class="sd"> Default is 0.3.</span>
<span class="sd"> http://matplotlib.1069221.n5.nabble.com/path-effects-question-td27630.html</span>
<span class="sd"> rho : float</span>
<span class="sd"> A scale factor to apply to the rgbFace color if `shadow_rgbFace`</span>
<span class="sd"> is not specified. Default is 0.3.</span>
<span class="sd"> **kwargs</span>
<span class="sd"> Extra keywords are stored and passed through to</span>
<span class="sd"> :meth:`AbstractPathEffect._update_gc`.</span>
<span class="sd"> """</span>
<span class="nb">super</span><span class="p">(</span><span class="n">SimplePatchShadow</span><span class="p">,</span> <span class="bp">self</span><span class="p">)</span><span class="o">.</span><span class="fm">__init__</span><span class="p">(</span><span class="n">offset</span><span class="p">)</span>
<span class="k">if</span> <span class="n">shadow_rgbFace</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_shadow_rgbFace</span> <span class="o">=</span> <span class="n">shadow_rgbFace</span>
<span class="k">else</span><span class="p">:</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_shadow_rgbFace</span> <span class="o">=</span> <span class="n">mcolors</span><span class="o">.</span><span class="n">to_rgba</span><span class="p">(</span><span class="n">shadow_rgbFace</span><span class="p">)</span>
<span class="k">if</span> <span class="n">alpha</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span>
<span class="n">alpha</span> <span class="o">=</span> <span class="mf">0.3</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_alpha</span> <span class="o">=</span> <span class="n">alpha</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_rho</span> <span class="o">=</span> <span class="n">rho</span>
<span class="c1">#: The dictionary of keywords to update the graphics collection with.</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_gc</span> <span class="o">=</span> <span class="n">kwargs</span>
<span class="c1">#: The offset transform object. The offset isn't calculated yet</span>
<span class="c1">#: as we don't know how big the figure will be in pixels.</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_offset_tran</span> <span class="o">=</span> <span class="n">mtransforms</span><span class="o">.</span><span class="n">Affine2D</span><span class="p">()</span>
<div class="viewcode-block" id="SimplePatchShadow.draw_path"><a class="viewcode-back" href="../../api/patheffects_api.html#matplotlib.patheffects.SimplePatchShadow.draw_path">[docs]</a> <span class="k">def</span> <span class="nf">draw_path</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">renderer</span><span class="p">,</span> <span class="n">gc</span><span class="p">,</span> <span class="n">tpath</span><span class="p">,</span> <span class="n">affine</span><span class="p">,</span> <span class="n">rgbFace</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Overrides the standard draw_path to add the shadow offset and</span>
<span class="sd"> necessary color changes for the shadow.</span>
<span class="sd"> """</span>
<span class="c1"># IMPORTANT: Do not modify the input - we copy everything instead.</span>
<span class="n">affine0</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">_offset_transform</span><span class="p">(</span><span class="n">renderer</span><span class="p">,</span> <span class="n">affine</span><span class="p">)</span>
<span class="n">gc0</span> <span class="o">=</span> <span class="n">renderer</span><span class="o">.</span><span class="n">new_gc</span><span class="p">()</span>
<span class="n">gc0</span><span class="o">.</span><span class="n">copy_properties</span><span class="p">(</span><span class="n">gc</span><span class="p">)</span>
<span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">_shadow_rgbFace</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span>
<span class="n">r</span><span class="p">,</span><span class="n">g</span><span class="p">,</span><span class="n">b</span> <span class="o">=</span> <span class="p">(</span><span class="n">rgbFace</span> <span class="ow">or</span> <span class="p">(</span><span class="mf">1.</span><span class="p">,</span> <span class="mf">1.</span><span class="p">,</span> <span class="mf">1.</span><span class="p">))[:</span><span class="mi">3</span><span class="p">]</span>
<span class="c1"># Scale the colors by a factor to improve the shadow effect.</span>
<span class="n">shadow_rgbFace</span> <span class="o">=</span> <span class="p">(</span><span class="n">r</span> <span class="o">*</span> <span class="bp">self</span><span class="o">.</span><span class="n">_rho</span><span class="p">,</span> <span class="n">g</span> <span class="o">*</span> <span class="bp">self</span><span class="o">.</span><span class="n">_rho</span><span class="p">,</span> <span class="n">b</span> <span class="o">*</span> <span class="bp">self</span><span class="o">.</span><span class="n">_rho</span><span class="p">)</span>
<span class="k">else</span><span class="p">:</span>
<span class="n">shadow_rgbFace</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">_shadow_rgbFace</span>
<span class="n">gc0</span><span class="o">.</span><span class="n">set_foreground</span><span class="p">(</span><span class="s2">"none"</span><span class="p">)</span>
<span class="n">gc0</span><span class="o">.</span><span class="n">set_alpha</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_alpha</span><span class="p">)</span>
<span class="n">gc0</span><span class="o">.</span><span class="n">set_linewidth</span><span class="p">(</span><span class="mi">0</span><span class="p">)</span>
<span class="n">gc0</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">_update_gc</span><span class="p">(</span><span class="n">gc0</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">_gc</span><span class="p">)</span>
<span class="n">renderer</span><span class="o">.</span><span class="n">draw_path</span><span class="p">(</span><span class="n">gc0</span><span class="p">,</span> <span class="n">tpath</span><span class="p">,</span> <span class="n">affine0</span><span class="p">,</span> <span class="n">shadow_rgbFace</span><span class="p">)</span>
<span class="n">gc0</span><span class="o">.</span><span class="n">restore</span><span class="p">()</span></div></div>
<div class="viewcode-block" id="withSimplePatchShadow"><a class="viewcode-back" href="../../api/patheffects_api.html#matplotlib.patheffects.withSimplePatchShadow">[docs]</a><span class="k">class</span> <span class="nc">withSimplePatchShadow</span><span class="p">(</span><span class="n">SimplePatchShadow</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Adds a simple :class:`SimplePatchShadow` and then draws the</span>
<span class="sd"> original Artist to avoid needing to call :class:`Normal`.</span>
<span class="sd"> """</span>
<div class="viewcode-block" id="withSimplePatchShadow.draw_path"><a class="viewcode-back" href="../../api/patheffects_api.html#matplotlib.patheffects.withSimplePatchShadow.draw_path">[docs]</a> <span class="k">def</span> <span class="nf">draw_path</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">renderer</span><span class="p">,</span> <span class="n">gc</span><span class="p">,</span> <span class="n">tpath</span><span class="p">,</span> <span class="n">affine</span><span class="p">,</span> <span class="n">rgbFace</span><span class="p">):</span>
<span class="n">SimplePatchShadow</span><span class="o">.</span><span class="n">draw_path</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">renderer</span><span class="p">,</span> <span class="n">gc</span><span class="p">,</span> <span class="n">tpath</span><span class="p">,</span> <span class="n">affine</span><span class="p">,</span> <span class="n">rgbFace</span><span class="p">)</span>
<span class="n">renderer</span><span class="o">.</span><span class="n">draw_path</span><span class="p">(</span><span class="n">gc</span><span class="p">,</span> <span class="n">tpath</span><span class="p">,</span> <span class="n">affine</span><span class="p">,</span> <span class="n">rgbFace</span><span class="p">)</span></div></div>
<div class="viewcode-block" id="SimpleLineShadow"><a class="viewcode-back" href="../../api/patheffects_api.html#matplotlib.patheffects.SimpleLineShadow">[docs]</a><span class="k">class</span> <span class="nc">SimpleLineShadow</span><span class="p">(</span><span class="n">AbstractPathEffect</span><span class="p">):</span>
<span class="sd">"""A simple shadow via a line."""</span>
<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="n">offset</span><span class="o">=</span><span class="p">(</span><span class="mi">2</span><span class="p">,</span><span class="o">-</span><span class="mi">2</span><span class="p">),</span>
<span class="n">shadow_color</span><span class="o">=</span><span class="s1">'k'</span><span class="p">,</span> <span class="n">alpha</span><span class="o">=</span><span class="mf">0.3</span><span class="p">,</span> <span class="n">rho</span><span class="o">=</span><span class="mf">0.3</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Parameters</span>
<span class="sd"> ----------</span>
<span class="sd"> offset : pair of floats</span>
<span class="sd"> The offset to apply to the path, in points.</span>
<span class="sd"> shadow_color : color</span>
<span class="sd"> The shadow color. Default is black.</span>
<span class="sd"> A value of ``None`` takes the original artist's color</span>
<span class="sd"> with a scale factor of `rho`.</span>
<span class="sd"> alpha : float</span>
<span class="sd"> The alpha transparency of the created shadow patch.</span>
<span class="sd"> Default is 0.3.</span>
<span class="sd"> rho : float</span>
<span class="sd"> A scale factor to apply to the rgbFace color if `shadow_rgbFace`</span>
<span class="sd"> is ``None``. Default is 0.3.</span>
<span class="sd"> **kwargs</span>
<span class="sd"> Extra keywords are stored and passed through to</span>
<span class="sd"> :meth:`AbstractPathEffect._update_gc`.</span>
<span class="sd"> """</span>
<span class="nb">super</span><span class="p">(</span><span class="n">SimpleLineShadow</span><span class="p">,</span> <span class="bp">self</span><span class="p">)</span><span class="o">.</span><span class="fm">__init__</span><span class="p">(</span><span class="n">offset</span><span class="p">)</span>
<span class="k">if</span> <span class="n">shadow_color</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_shadow_color</span> <span class="o">=</span> <span class="n">shadow_color</span>
<span class="k">else</span><span class="p">:</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_shadow_color</span> <span class="o">=</span> <span class="n">mcolors</span><span class="o">.</span><span class="n">to_rgba</span><span class="p">(</span><span class="n">shadow_color</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_alpha</span> <span class="o">=</span> <span class="n">alpha</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_rho</span> <span class="o">=</span> <span class="n">rho</span>
<span class="c1">#: The dictionary of keywords to update the graphics collection with.</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_gc</span> <span class="o">=</span> <span class="n">kwargs</span>
<span class="c1">#: The offset transform object. The offset isn't calculated yet</span>
<span class="c1">#: as we don't know how big the figure will be in pixels.</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_offset_tran</span> <span class="o">=</span> <span class="n">mtransforms</span><span class="o">.</span><span class="n">Affine2D</span><span class="p">()</span>
<div class="viewcode-block" id="SimpleLineShadow.draw_path"><a class="viewcode-back" href="../../api/patheffects_api.html#matplotlib.patheffects.SimpleLineShadow.draw_path">[docs]</a> <span class="k">def</span> <span class="nf">draw_path</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">renderer</span><span class="p">,</span> <span class="n">gc</span><span class="p">,</span> <span class="n">tpath</span><span class="p">,</span> <span class="n">affine</span><span class="p">,</span> <span class="n">rgbFace</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Overrides the standard draw_path to add the shadow offset and</span>
<span class="sd"> necessary color changes for the shadow.</span>
<span class="sd"> """</span>
<span class="c1"># IMPORTANT: Do not modify the input - we copy everything instead.</span>
<span class="n">affine0</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">_offset_transform</span><span class="p">(</span><span class="n">renderer</span><span class="p">,</span> <span class="n">affine</span><span class="p">)</span>
<span class="n">gc0</span> <span class="o">=</span> <span class="n">renderer</span><span class="o">.</span><span class="n">new_gc</span><span class="p">()</span>
<span class="n">gc0</span><span class="o">.</span><span class="n">copy_properties</span><span class="p">(</span><span class="n">gc</span><span class="p">)</span>
<span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">_shadow_color</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span>
<span class="n">r</span><span class="p">,</span><span class="n">g</span><span class="p">,</span><span class="n">b</span> <span class="o">=</span> <span class="p">(</span><span class="n">gc0</span><span class="o">.</span><span class="n">get_foreground</span><span class="p">()</span> <span class="ow">or</span> <span class="p">(</span><span class="mf">1.</span><span class="p">,</span> <span class="mf">1.</span><span class="p">,</span> <span class="mf">1.</span><span class="p">))[:</span><span class="mi">3</span><span class="p">]</span>
<span class="c1"># Scale the colors by a factor to improve the shadow effect.</span>
<span class="n">shadow_rgbFace</span> <span class="o">=</span> <span class="p">(</span><span class="n">r</span> <span class="o">*</span> <span class="bp">self</span><span class="o">.</span><span class="n">_rho</span><span class="p">,</span> <span class="n">g</span> <span class="o">*</span> <span class="bp">self</span><span class="o">.</span><span class="n">_rho</span><span class="p">,</span> <span class="n">b</span> <span class="o">*</span> <span class="bp">self</span><span class="o">.</span><span class="n">_rho</span><span class="p">)</span>
<span class="k">else</span><span class="p">:</span>
<span class="n">shadow_rgbFace</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">_shadow_color</span>
<span class="n">fill_color</span> <span class="o">=</span> <span class="kc">None</span>
<span class="n">gc0</span><span class="o">.</span><span class="n">set_foreground</span><span class="p">(</span><span class="n">shadow_rgbFace</span><span class="p">)</span>
<span class="n">gc0</span><span class="o">.</span><span class="n">set_alpha</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_alpha</span><span class="p">)</span>
<span class="n">gc0</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">_update_gc</span><span class="p">(</span><span class="n">gc0</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">_gc</span><span class="p">)</span>
<span class="n">renderer</span><span class="o">.</span><span class="n">draw_path</span><span class="p">(</span><span class="n">gc0</span><span class="p">,</span> <span class="n">tpath</span><span class="p">,</span> <span class="n">affine0</span><span class="p">,</span> <span class="n">fill_color</span><span class="p">)</span>
<span class="n">gc0</span><span class="o">.</span><span class="n">restore</span><span class="p">()</span></div></div>
<div class="viewcode-block" id="PathPatchEffect"><a class="viewcode-back" href="../../api/patheffects_api.html#matplotlib.patheffects.PathPatchEffect">[docs]</a><span class="k">class</span> <span class="nc">PathPatchEffect</span><span class="p">(</span><span class="n">AbstractPathEffect</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Draws a :class:`~matplotlib.patches.PathPatch` instance whose Path</span>
<span class="sd"> comes from the original PathEffect artist.</span>
<span class="sd"> """</span>
<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="n">offset</span><span class="o">=</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="o">**</span><span class="n">kwargs</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Parameters</span>
<span class="sd"> ----------</span>
<span class="sd"> offset : pair of floats</span>
<span class="sd"> The offset to apply to the path, in points.</span>
<span class="sd"> **kwargs :</span>
<span class="sd"> All keyword arguments are passed through to the</span>
<span class="sd"> :class:`~matplotlib.patches.PathPatch` constructor. The</span>
<span class="sd"> properties which cannot be overridden are "path", "clip_box"</span>
<span class="sd"> "transform" and "clip_path".</span>
<span class="sd"> """</span>
<span class="nb">super</span><span class="p">(</span><span class="n">PathPatchEffect</span><span class="p">,</span> <span class="bp">self</span><span class="p">)</span><span class="o">.</span><span class="fm">__init__</span><span class="p">(</span><span class="n">offset</span><span class="o">=</span><span class="n">offset</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">patch</span> <span class="o">=</span> <span class="n">mpatches</span><span class="o">.</span><span class="n">PathPatch</span><span class="p">([],</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">)</span>
<div class="viewcode-block" id="PathPatchEffect.draw_path"><a class="viewcode-back" href="../../api/patheffects_api.html#matplotlib.patheffects.PathPatchEffect.draw_path">[docs]</a> <span class="k">def</span> <span class="nf">draw_path</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">renderer</span><span class="p">,</span> <span class="n">gc</span><span class="p">,</span> <span class="n">tpath</span><span class="p">,</span> <span class="n">affine</span><span class="p">,</span> <span class="n">rgbFace</span><span class="p">):</span>
<span class="n">affine</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">_offset_transform</span><span class="p">(</span><span class="n">renderer</span><span class="p">,</span> <span class="n">affine</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">patch</span><span class="o">.</span><span class="n">_path</span> <span class="o">=</span> <span class="n">tpath</span>
<span class="bp">self</span><span class="o">.</span><span class="n">patch</span><span class="o">.</span><span class="n">set_transform</span><span class="p">(</span><span class="n">affine</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">patch</span><span class="o">.</span><span class="n">set_clip_box</span><span class="p">(</span><span class="n">gc</span><span class="o">.</span><span class="n">get_clip_rectangle</span><span class="p">())</span>
<span class="n">clip_path</span> <span class="o">=</span> <span class="n">gc</span><span class="o">.</span><span class="n">get_clip_path</span><span class="p">()</span>
<span class="k">if</span> <span class="n">clip_path</span><span class="p">:</span>
<span class="bp">self</span><span class="o">.</span><span class="n">patch</span><span class="o">.</span><span class="n">set_clip_path</span><span class="p">(</span><span class="o">*</span><span class="n">clip_path</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">patch</span><span class="o">.</span><span class="n">draw</span><span class="p">(</span><span class="n">renderer</span><span class="p">)</span></div></div>
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