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196 lines
17 KiB
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<title>bbox.py</title>
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<link rel="stylesheet" href="../pycco.css">
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<div class='docs'><h1>bbox.py</h1></div>
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<div class='section' id='section-0'>
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<a class='octothorpe' href='#section-0'>#</a>
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<div class='code'>
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<div class="highlight"><pre><span class="kn">from</span> <span class="nn">point</span> <span class="kn">import</span> <span class="n">Point</span></pre></div>
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<a class='octothorpe' href='#section-1'>#</a>
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<p>2D bounding box</p>
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</div>
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<div class='code'>
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<div class="highlight"><pre><span class="k">class</span> <span class="nc">BBox</span><span class="p">(</span><span class="nb">object</span><span class="p">):</span></pre></div>
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<div class='section' id='section-2'>
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<a class='octothorpe' href='#section-2'>#</a>
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<div class='code'>
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<div class="highlight"><pre> <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">width</span><span class="o">=</span><span class="bp">None</span><span class="p">,</span> <span class="n">height</span><span class="o">=</span><span class="bp">None</span><span class="p">,</span> <span class="n">left</span><span class="o">=</span><span class="mi">0</span><span class="p">,</span> <span class="n">top</span><span class="o">=</span><span class="mi">0</span><span class="p">):</span>
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<span class="kn">import</span> <span class="nn">sys</span>
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<span class="k">if</span> <span class="n">width</span> <span class="o">==</span> <span class="bp">None</span><span class="p">:</span>
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<span class="bp">self</span><span class="o">.</span><span class="n">xmin</span> <span class="o">=</span> <span class="n">sys</span><span class="o">.</span><span class="n">maxint</span>
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<span class="bp">self</span><span class="o">.</span><span class="n">xmax</span> <span class="o">=</span> <span class="n">sys</span><span class="o">.</span><span class="n">maxint</span> <span class="o">*</span> <span class="o">-</span><span class="mi">1</span>
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<span class="k">else</span><span class="p">:</span>
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<span class="bp">self</span><span class="o">.</span><span class="n">xmin</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">left</span> <span class="o">=</span> <span class="n">left</span>
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<span class="bp">self</span><span class="o">.</span><span class="n">xmax</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">right</span> <span class="o">=</span> <span class="n">left</span> <span class="o">+</span> <span class="n">width</span>
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<span class="bp">self</span><span class="o">.</span><span class="n">width</span> <span class="o">=</span> <span class="n">width</span>
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<span class="k">if</span> <span class="n">height</span> <span class="o">==</span> <span class="bp">None</span><span class="p">:</span>
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<span class="bp">self</span><span class="o">.</span><span class="n">ymin</span> <span class="o">=</span> <span class="n">sys</span><span class="o">.</span><span class="n">maxint</span>
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<span class="bp">self</span><span class="o">.</span><span class="n">ymax</span> <span class="o">=</span> <span class="n">sys</span><span class="o">.</span><span class="n">maxint</span> <span class="o">*</span> <span class="o">-</span><span class="mi">1</span>
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<span class="k">else</span><span class="p">:</span>
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<span class="bp">self</span><span class="o">.</span><span class="n">ymin</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">top</span> <span class="o">=</span> <span class="n">top</span>
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<span class="bp">self</span><span class="o">.</span><span class="n">ymax</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">bottom</span> <span class="o">=</span> <span class="n">height</span> <span class="o">+</span> <span class="n">top</span>
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<span class="bp">self</span><span class="o">.</span><span class="n">height</span> <span class="o">=</span> <span class="n">height</span></pre></div>
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<div class='section' id='section-3'>
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<a class='octothorpe' href='#section-3'>#</a>
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<div class='code'>
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<div class="highlight"><pre> <span class="k">def</span> <span class="nf">update</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">pt</span><span class="p">):</span>
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<span class="k">if</span> <span class="ow">not</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">pt</span><span class="p">,</span> <span class="n">Point</span><span class="p">):</span>
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<span class="n">pt</span> <span class="o">=</span> <span class="n">Point</span><span class="p">(</span><span class="n">pt</span><span class="p">[</span><span class="mi">0</span><span class="p">],</span> <span class="n">pt</span><span class="p">[</span><span class="mi">1</span><span class="p">])</span>
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<span class="bp">self</span><span class="o">.</span><span class="n">xmin</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">xmin</span><span class="p">,</span> <span class="n">pt</span><span class="o">.</span><span class="n">x</span><span class="p">)</span>
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<span class="bp">self</span><span class="o">.</span><span class="n">ymin</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">ymin</span><span class="p">,</span> <span class="n">pt</span><span class="o">.</span><span class="n">y</span><span class="p">)</span>
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<span class="bp">self</span><span class="o">.</span><span class="n">xmax</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">xmax</span><span class="p">,</span> <span class="n">pt</span><span class="o">.</span><span class="n">x</span><span class="p">)</span>
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<span class="bp">self</span><span class="o">.</span><span class="n">ymax</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">ymax</span><span class="p">,</span> <span class="n">pt</span><span class="o">.</span><span class="n">y</span><span class="p">)</span>
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<span class="bp">self</span><span class="o">.</span><span class="n">left</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">xmin</span>
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<span class="bp">self</span><span class="o">.</span><span class="n">top</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">ymin</span>
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<span class="bp">self</span><span class="o">.</span><span class="n">right</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">xmax</span>
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<span class="bp">self</span><span class="o">.</span><span class="n">bottom</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">ymax</span>
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<span class="bp">self</span><span class="o">.</span><span class="n">width</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">xmax</span> <span class="o">-</span> <span class="bp">self</span><span class="o">.</span><span class="n">xmin</span>
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<span class="bp">self</span><span class="o">.</span><span class="n">height</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">ymax</span> <span class="o">-</span> <span class="bp">self</span><span class="o">.</span><span class="n">ymin</span></pre></div>
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<div class='section' id='section-4'>
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<a class='octothorpe' href='#section-4'>#</a>
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<p>returns true if two bounding boxes overlap</p>
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</div>
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<div class='code'>
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<div class="highlight"><pre> <span class="k">def</span> <span class="nf">intersects</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">bbox</span><span class="p">):</span></pre></div>
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<div class='section' id='section-5'>
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<a class='octothorpe' href='#section-5'>#</a>
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<div class='code'>
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<div class="highlight"><pre> <span class="k">return</span> <span class="n">bbox</span><span class="o">.</span><span class="n">left</span> <span class="o"><</span> <span class="bp">self</span><span class="o">.</span><span class="n">right</span> <span class="ow">and</span> <span class="n">bbox</span><span class="o">.</span><span class="n">right</span> <span class="o">></span> <span class="bp">self</span><span class="o">.</span><span class="n">left</span> <span class="ow">and</span> <span class="n">bbox</span><span class="o">.</span><span class="n">top</span> <span class="o"><</span> <span class="bp">self</span><span class="o">.</span><span class="n">bottom</span> <span class="ow">and</span> <span class="n">bbox</span><span class="o">.</span><span class="n">bottom</span> <span class="o">></span> <span class="bp">self</span><span class="o">.</span><span class="n">top</span></pre></div>
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</div>
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<div class='section' id='section-6'>
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<a class='octothorpe' href='#section-6'>#</a>
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<p>check if a point is inside the bbox</p>
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</div>
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<div class='code'>
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<div class="highlight"><pre> <span class="k">def</span> <span class="nf">check_point</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">pt</span><span class="p">):</span></pre></div>
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<div class='section' id='section-7'>
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<a class='octothorpe' href='#section-7'>#</a>
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<div class='code'>
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<div class="highlight"><pre> <span class="k">return</span> <span class="n">pt</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span> <span class="o">></span> <span class="bp">self</span><span class="o">.</span><span class="n">xmin</span> <span class="ow">and</span> <span class="n">pt</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span> <span class="o"><</span> <span class="bp">self</span><span class="o">.</span><span class="n">xmax</span> <span class="ow">and</span> <span class="n">pt</span><span class="p">[</span><span class="mi">1</span><span class="p">]</span> <span class="o">></span> <span class="bp">self</span><span class="o">.</span><span class="n">ymin</span> <span class="ow">and</span> <span class="n">pt</span><span class="p">[</span><span class="mi">1</span><span class="p">]</span> <span class="o"><</span> <span class="bp">self</span><span class="o">.</span><span class="n">ymax</span></pre></div>
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<div class='section' id='section-8'>
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<a class='octothorpe' href='#section-8'>#</a>
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<div class='code'>
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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>
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<span class="k">return</span> <span class="s">'BBox(x=</span><span class="si">%.2f</span><span class="s">, y=</span><span class="si">%.2f</span><span class="s">, w=</span><span class="si">%.2f</span><span class="s">, h=</span><span class="si">%.2f</span><span class="s">)'</span> <span class="o">%</span> <span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">left</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">top</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">width</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">height</span><span class="p">)</span></pre></div>
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<div class='section' id='section-9'>
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<a class='octothorpe' href='#section-9'>#</a>
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<div class='code'>
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<div class="highlight"><pre> <span class="k">def</span> <span class="nf">join</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">bbox</span><span class="p">):</span>
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<span class="bp">self</span><span class="o">.</span><span class="n">update</span><span class="p">(</span><span class="n">Point</span><span class="p">(</span><span class="n">bbox</span><span class="o">.</span><span class="n">left</span><span class="p">,</span> <span class="n">bbox</span><span class="o">.</span><span class="n">top</span><span class="p">))</span>
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<span class="bp">self</span><span class="o">.</span><span class="n">update</span><span class="p">(</span><span class="n">Point</span><span class="p">(</span><span class="n">bbox</span><span class="o">.</span><span class="n">right</span><span class="p">,</span> <span class="n">bbox</span><span class="o">.</span><span class="n">bottom</span><span class="p">))</span></pre></div>
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<div class='section' id='section-10'>
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<a class='octothorpe' href='#section-10'>#</a>
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<div class='code'>
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<div class="highlight"><pre> <span class="k">def</span> <span class="nf">inflate</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">amount</span><span class="o">=</span><span class="mi">0</span><span class="p">,</span> <span class="n">inflate</span><span class="o">=</span><span class="bp">False</span><span class="p">):</span>
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<span class="k">if</span> <span class="n">inflate</span><span class="p">:</span>
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<span class="n">d</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">width</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">height</span><span class="p">)</span>
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<span class="n">amount</span> <span class="o">+=</span> <span class="n">d</span> <span class="o">*</span> <span class="n">inflate</span>
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<span class="bp">self</span><span class="o">.</span><span class="n">xmin</span> <span class="o">-=</span> <span class="n">amount</span>
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<span class="bp">self</span><span class="o">.</span><span class="n">ymin</span> <span class="o">-=</span> <span class="n">amount</span>
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<span class="bp">self</span><span class="o">.</span><span class="n">xmax</span> <span class="o">+=</span> <span class="n">amount</span>
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<span class="bp">self</span><span class="o">.</span><span class="n">ymax</span> <span class="o">+=</span> <span class="n">amount</span>
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<span class="bp">self</span><span class="o">.</span><span class="n">left</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">xmin</span>
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<span class="bp">self</span><span class="o">.</span><span class="n">top</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">ymin</span>
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<span class="bp">self</span><span class="o">.</span><span class="n">right</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">xmax</span>
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<span class="bp">self</span><span class="o">.</span><span class="n">bottom</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">ymax</span>
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<span class="bp">self</span><span class="o">.</span><span class="n">width</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">xmax</span> <span class="o">-</span> <span class="bp">self</span><span class="o">.</span><span class="n">xmin</span>
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<span class="bp">self</span><span class="o">.</span><span class="n">height</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">ymax</span> <span class="o">-</span> <span class="bp">self</span><span class="o">.</span><span class="n">ymin</span>
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</pre></div>
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