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<div class="section" id="animation-example-code-simple-3danim-py">
<span id="animation-simple-3danim"></span><h1>animation example code: simple_3danim.py<a class="headerlink" href="#animation-example-code-simple-3danim-py" title="Permalink to this headline">ΒΆ</a></h1>
<p>[<a class="reference external" href="simple_3danim.py">source code</a>]</p>
<div class="highlight-python"><div class="highlight"><pre><span class="sd">"""</span>
<span class="sd">A simple example of an animated plot... In 3D!</span>
<span class="sd">"""</span>
<span class="kn">import</span> <span class="nn">numpy</span> <span class="kn">as</span> <span class="nn">np</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">mpl_toolkits.mplot3d.axes3d</span> <span class="kn">as</span> <span class="nn">p3</span>
<span class="kn">import</span> <span class="nn">matplotlib.animation</span> <span class="kn">as</span> <span class="nn">animation</span>
<span class="k">def</span> <span class="nf">Gen_RandLine</span><span class="p">(</span><span class="n">length</span><span class="p">,</span> <span class="n">dims</span><span class="o">=</span><span class="mi">2</span><span class="p">)</span> <span class="p">:</span>
<span class="sd">"""</span>
<span class="sd"> Create a line using a random walk algorithm</span>
<span class="sd"> length is the number of points for the line.</span>
<span class="sd"> dims is the number of dimensions the line has.</span>
<span class="sd"> """</span>
<span class="n">lineData</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">empty</span><span class="p">((</span><span class="n">dims</span><span class="p">,</span> <span class="n">length</span><span class="p">))</span>
<span class="n">lineData</span><span class="p">[:,</span> <span class="mi">0</span><span class="p">]</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">random</span><span class="o">.</span><span class="n">rand</span><span class="p">(</span><span class="n">dims</span><span class="p">)</span>
<span class="k">for</span> <span class="n">index</span> <span class="ow">in</span> <span class="nb">range</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="n">length</span><span class="p">)</span> <span class="p">:</span>
<span class="c"># scaling the random numbers by 0.1 so</span>
<span class="c"># movement is small compared to position.</span>
<span class="c"># subtraction by 0.5 is to change the range to [-0.5, 0.5]</span>
<span class="c"># to allow a line to move backwards.</span>
<span class="n">step</span> <span class="o">=</span> <span class="p">((</span><span class="n">np</span><span class="o">.</span><span class="n">random</span><span class="o">.</span><span class="n">rand</span><span class="p">(</span><span class="n">dims</span><span class="p">)</span> <span class="o">-</span> <span class="mf">0.5</span><span class="p">)</span> <span class="o">*</span> <span class="mf">0.1</span><span class="p">)</span>
<span class="n">lineData</span><span class="p">[:,</span> <span class="n">index</span><span class="p">]</span> <span class="o">=</span> <span class="n">lineData</span><span class="p">[:,</span> <span class="n">index</span><span class="o">-</span><span class="mi">1</span><span class="p">]</span> <span class="o">+</span> <span class="n">step</span>
<span class="k">return</span> <span class="n">lineData</span>
<span class="k">def</span> <span class="nf">update_lines</span><span class="p">(</span><span class="n">num</span><span class="p">,</span> <span class="n">dataLines</span><span class="p">,</span> <span class="n">lines</span><span class="p">)</span> <span class="p">:</span>
<span class="k">for</span> <span class="n">line</span><span class="p">,</span> <span class="n">data</span> <span class="ow">in</span> <span class="nb">zip</span><span class="p">(</span><span class="n">lines</span><span class="p">,</span> <span class="n">dataLines</span><span class="p">)</span> <span class="p">:</span>
<span class="c"># NOTE: there is no .set_data() for 3 dim data...</span>
<span class="n">line</span><span class="o">.</span><span class="n">set_data</span><span class="p">(</span><span class="n">data</span><span class="p">[</span><span class="mi">0</span><span class="p">:</span><span class="mi">2</span><span class="p">,</span> <span class="p">:</span><span class="n">num</span><span class="p">])</span>
<span class="n">line</span><span class="o">.</span><span class="n">set_3d_properties</span><span class="p">(</span><span class="n">data</span><span class="p">[</span><span class="mi">2</span><span class="p">,:</span><span class="n">num</span><span class="p">])</span>
<span class="k">return</span> <span class="n">lines</span>
<span class="c"># Attaching 3D axis to the figure</span>
<span class="n">fig</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">p3</span><span class="o">.</span><span class="n">Axes3D</span><span class="p">(</span><span class="n">fig</span><span class="p">)</span>
<span class="c"># Fifty lines of random 3-D lines</span>
<span class="n">data</span> <span class="o">=</span> <span class="p">[</span><span class="n">Gen_RandLine</span><span class="p">(</span><span class="mi">25</span><span class="p">,</span> <span class="mi">3</span><span class="p">)</span> <span class="k">for</span> <span class="n">index</span> <span class="ow">in</span> <span class="nb">range</span><span class="p">(</span><span class="mi">50</span><span class="p">)]</span>
<span class="c"># Creating fifty line objects.</span>
<span class="c"># NOTE: Can't pass empty arrays into 3d version of plot()</span>
<span class="n">lines</span> <span class="o">=</span> <span class="p">[</span><span class="n">ax</span><span class="o">.</span><span class="n">plot</span><span class="p">(</span><span class="n">dat</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="mi">1</span><span class="p">],</span> <span class="n">dat</span><span class="p">[</span><span class="mi">1</span><span class="p">,</span> <span class="mi">0</span><span class="p">:</span><span class="mi">1</span><span class="p">],</span> <span class="n">dat</span><span class="p">[</span><span class="mi">2</span><span class="p">,</span> <span class="mi">0</span><span class="p">:</span><span class="mi">1</span><span class="p">])[</span><span class="mi">0</span><span class="p">]</span> <span class="k">for</span> <span class="n">dat</span> <span class="ow">in</span> <span class="n">data</span><span class="p">]</span>
<span class="c"># Setting the axes properties</span>
<span class="n">ax</span><span class="o">.</span><span class="n">set_xlim3d</span><span class="p">([</span><span class="mf">0.0</span><span class="p">,</span> <span class="mf">1.0</span><span class="p">])</span>
<span class="n">ax</span><span class="o">.</span><span class="n">set_xlabel</span><span class="p">(</span><span class="s">'X'</span><span class="p">)</span>
<span class="n">ax</span><span class="o">.</span><span class="n">set_ylim3d</span><span class="p">([</span><span class="mf">0.0</span><span class="p">,</span> <span class="mf">1.0</span><span class="p">])</span>
<span class="n">ax</span><span class="o">.</span><span class="n">set_ylabel</span><span class="p">(</span><span class="s">'Y'</span><span class="p">)</span>
<span class="n">ax</span><span class="o">.</span><span class="n">set_zlim3d</span><span class="p">([</span><span class="mf">0.0</span><span class="p">,</span> <span class="mf">1.0</span><span class="p">])</span>
<span class="n">ax</span><span class="o">.</span><span class="n">set_zlabel</span><span class="p">(</span><span class="s">'Z'</span><span class="p">)</span>
<span class="n">ax</span><span class="o">.</span><span class="n">set_title</span><span class="p">(</span><span class="s">'3D Test'</span><span class="p">)</span>
<span class="c"># Creating the Animation object</span>
<span class="n">line_ani</span> <span class="o">=</span> <span class="n">animation</span><span class="o">.</span><span class="n">FuncAnimation</span><span class="p">(</span><span class="n">fig</span><span class="p">,</span> <span class="n">update_lines</span><span class="p">,</span> <span class="mi">25</span><span class="p">,</span> <span class="n">fargs</span><span class="o">=</span><span class="p">(</span><span class="n">data</span><span class="p">,</span> <span class="n">lines</span><span class="p">),</span>
<span class="n">interval</span><span class="o">=</span><span class="mi">50</span><span class="p">,</span> <span class="n">blit</span><span class="o">=</span><span class="bp">False</span><span class="p">)</span>
<span class="n">plt</span><span class="o">.</span><span class="n">show</span><span class="p">()</span>
</pre></div>
</div>
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