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<div class="section" id="hc-spatialhash">
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<h1>HC.spatialhash<a class="headerlink" href="#hc-spatialhash" title="Permalink to this headline">¶</a></h1>
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<div class="highlight-lua"><div class="highlight"><pre><span class="n">spatialhash</span> <span class="o">=</span> <span class="nb">require</span> <span class="s1">'</span><span class="s">HC.spatialhash'</span>
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</pre></div>
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</div>
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<p>A spatial hash implementation that supports scenes of arbitrary size. The hash
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is sparse, which means that cells will only be created when needed.</p>
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<dl class="class">
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<dt id="Spatialhash">
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<em class="property">class </em><code class="descname">Spatialhash</code><span class="sig-paren">(</span><span class="optional">[</span><em>cellsize = 100</em><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#Spatialhash" title="Permalink to this definition">¶</a></dt>
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<dd><table class="docutils field-list" frame="void" rules="none">
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<col class="field-name" />
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<col class="field-body" />
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<tbody valign="top">
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<tr class="field-odd field"><th class="field-name">Arguments:</th><td class="field-body"><ul class="first last simple">
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<li><strong>cellsize</strong> (<em>number</em>) – Width and height of a cell (optional).</li>
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</ul>
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</td>
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</tr>
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</tbody>
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</table>
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</dd></dl>
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<p>Create a new spatial hash with a given cell size.</p>
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<p>Choosing a good cell size depends on your application. To get a decent speedup,
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the average cell should not contain too many objects, nor should a single
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object occupy too many cells. A good rule of thumb is to choose the cell size
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so that the average object will occupy only one cell.</p>
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<div class="admonition note">
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<p class="first admonition-title">Note</p>
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<p class="last">The syntax depends on used class system. The shown syntax works when using
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the bundled <a class="reference external" href="http://vrld.github.com/hump/#hump.class">hump.class</a> or
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<a class="reference external" href="https://bitbucket.org/bartbes/slither">slither</a>.</p>
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</div>
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<p><strong>Example</strong>:</p>
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<div class="highlight-lua"><div class="highlight"><pre><span class="n">Spatialhash</span> <span class="o">=</span> <span class="nb">require</span> <span class="s1">'</span><span class="s">hardoncollider.spatialhash'</span>
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<span class="n">hash</span> <span class="o">=</span> <span class="n">Spatialhash</span><span class="p">(</span><span class="mi">150</span><span class="p">)</span>
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</pre></div>
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</div>
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<dl class="function">
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<dt id="Spatialhash:cellCoords">
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<code class="descname">Spatialhash:cellCoords</code><span class="sig-paren">(</span><em>x</em>, <em>y</em><span class="sig-paren">)</span><a class="headerlink" href="#Spatialhash:cellCoords" title="Permalink to this definition">¶</a></dt>
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<dd><table class="docutils field-list" frame="void" rules="none">
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<col class="field-name" />
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<col class="field-body" />
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<tbody valign="top">
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<tr class="field-odd field"><th class="field-name">Arguments:</th><td class="field-body"><ul class="first simple">
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<li><strong>x, y</strong> (<em>numbers</em>) – The position to query.</li>
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</ul>
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</td>
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</tr>
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<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first last">Coordinates of the cell which would contain <code class="docutils literal"><span class="pre">x,y</span></code>.</p>
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</td>
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</tr>
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</tbody>
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</table>
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</dd></dl>
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<p>Get coordinates of a given value, i.e. the cell index in which a given point
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would be placed.</p>
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<p><strong>Example</strong>:</p>
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<div class="highlight-lua"><div class="highlight"><pre><span class="kd">local</span> <span class="n">mx</span><span class="p">,</span><span class="n">my</span> <span class="o">=</span> <span class="n">love</span><span class="p">.</span><span class="n">mouse</span><span class="p">.</span><span class="n">getPosition</span><span class="p">()</span>
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<span class="n">cx</span><span class="p">,</span> <span class="n">cy</span> <span class="o">=</span> <span class="n">hash</span><span class="p">:</span><span class="n">cellCoords</span><span class="p">(</span><span class="n">mx</span><span class="p">,</span> <span class="n">my</span><span class="p">)</span>
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</pre></div>
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</div>
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<dl class="function">
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<dt id="Spatialhash:cell">
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<code class="descname">Spatialhash:cell</code><span class="sig-paren">(</span><em>i</em>, <em>k</em><span class="sig-paren">)</span><a class="headerlink" href="#Spatialhash:cell" title="Permalink to this definition">¶</a></dt>
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<dd><table class="docutils field-list" frame="void" rules="none">
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<col class="field-name" />
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<col class="field-body" />
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<tbody valign="top">
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<tr class="field-odd field"><th class="field-name">Arguments:</th><td class="field-body"><ul class="first simple">
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<li><strong>i, k</strong> (<em>numbers</em>) – The cell index.</li>
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</ul>
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</td>
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</tr>
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<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first last">Set of objects contained in the cell.</p>
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</td>
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</tr>
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</tbody>
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</table>
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</dd></dl>
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<p>Get the cell with given coordinates.</p>
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<p>A cell is a table which’s keys and value are the objects stored in the cell,
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i.e.:</p>
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<div class="highlight-lua"><div class="highlight"><pre><span class="n">cell</span> <span class="o">=</span> <span class="p">{</span>
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<span class="p">[</span><span class="n">obj1</span><span class="p">]</span> <span class="o">=</span> <span class="n">obj1</span><span class="p">,</span>
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<span class="p">[</span><span class="n">obj2</span><span class="p">]</span> <span class="o">=</span> <span class="n">obj2</span><span class="p">,</span>
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<span class="o">...</span>
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<span class="p">}</span>
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</pre></div>
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</div>
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<p>You can iterate over the objects in a cell using <code class="docutils literal"><span class="pre">pairs()</span></code>:</p>
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<div class="highlight-lua"><div class="highlight"><pre><span class="k">for</span> <span class="n">object</span> <span class="k">in</span> <span class="nb">pairs</span><span class="p">(</span><span class="n">cell</span><span class="p">)</span> <span class="k">do</span> <span class="n">stuff</span><span class="p">(</span><span class="n">object</span><span class="p">)</span> <span class="k">end</span>
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</pre></div>
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</div>
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<p><strong>Example</strong>:</p>
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<div class="highlight-lua"><div class="highlight"><pre><span class="kd">local</span> <span class="n">mx</span><span class="p">,</span><span class="n">my</span> <span class="o">=</span> <span class="n">love</span><span class="p">.</span><span class="n">mouse</span><span class="p">.</span><span class="n">getPosition</span><span class="p">()</span>
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<span class="n">cx</span><span class="p">,</span> <span class="n">cy</span> <span class="o">=</span> <span class="n">hash</span><span class="p">:</span><span class="n">cellCoords</span><span class="p">(</span><span class="n">mx</span><span class="p">,</span> <span class="n">my</span><span class="p">)</span>
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<span class="n">cell</span> <span class="o">=</span> <span class="n">hash</span><span class="p">:</span><span class="n">cell</span><span class="p">(</span><span class="n">cx</span><span class="p">,</span> <span class="n">cy</span><span class="p">)</span>
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</pre></div>
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</div>
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<dl class="function">
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<dt id="Spatialhash:cellAt">
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<code class="descname">Spatialhash:cellAt</code><span class="sig-paren">(</span><em>x</em>, <em>y</em><span class="sig-paren">)</span><a class="headerlink" href="#Spatialhash:cellAt" title="Permalink to this definition">¶</a></dt>
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<dd><table class="docutils field-list" frame="void" rules="none">
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<col class="field-name" />
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<col class="field-body" />
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<tbody valign="top">
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<tr class="field-odd field"><th class="field-name">Arguments:</th><td class="field-body"><ul class="first simple">
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<li><strong>x, y</strong> (<em>numbers</em>) – The position to query.</li>
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</ul>
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</td>
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</tr>
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<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first last">Set of objects contained in the cell.</p>
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</td>
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</tr>
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</tbody>
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</table>
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</dd></dl>
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<p>Get the cell that contains point x,y.</p>
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<p>Same as <code class="docutils literal"><span class="pre">hash:cell(hash:cellCoords(x,y))</span></code></p>
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<p><strong>Example</strong>:</p>
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<div class="highlight-lua"><div class="highlight"><pre><span class="kd">local</span> <span class="n">mx</span><span class="p">,</span><span class="n">my</span> <span class="o">=</span> <span class="n">love</span><span class="p">.</span><span class="n">mouse</span><span class="p">.</span><span class="n">getPosition</span><span class="p">()</span>
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<span class="n">cell</span> <span class="o">=</span> <span class="n">hash</span><span class="p">:</span><span class="n">cellAt</span><span class="p">(</span><span class="n">mx</span><span class="p">,</span> <span class="n">my</span><span class="p">)</span>
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</pre></div>
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</div>
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<dl class="function">
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<dt id="Spatialhash:shapes">
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<code class="descname">Spatialhash:shapes</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#Spatialhash:shapes" title="Permalink to this definition">¶</a></dt>
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<dd><table class="docutils field-list" frame="void" rules="none">
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<col class="field-name" />
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<col class="field-body" />
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<tbody valign="top">
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<tr class="field-odd field"><th class="field-name">Returns:</th><td class="field-body">Set of all shapes in the hash.</td>
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</tr>
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</tbody>
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</table>
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</dd></dl>
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<p>Get <em>all</em> shapes that are recorded in the hash.</p>
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<dl class="function">
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<dt id="Spatialhash:inSameCells">
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<code class="descname">Spatialhash:inSameCells</code><span class="sig-paren">(</span><em>x1</em>, <em>y1</em>, <em>x2</em>, <em>y2</em><span class="sig-paren">)</span><a class="headerlink" href="#Spatialhash:inSameCells" title="Permalink to this definition">¶</a></dt>
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<dd><table class="docutils field-list" frame="void" rules="none">
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<col class="field-name" />
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<col class="field-body" />
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<tbody valign="top">
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<tr class="field-odd field"><th class="field-name">Arguments:</th><td class="field-body"><ul class="first simple">
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<li><strong>x1,y1</strong> (<em>numbers</em>) – Upper left corner of the query bounding box.</li>
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<li><strong>x2,y2</strong> (<em>numbers</em>) – Lower right corner of the query bounding box.</li>
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</ul>
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</td>
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</tr>
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<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first last">Set of all shapes in the same cell as the bbox.</p>
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</td>
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</tr>
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</tbody>
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</table>
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</dd></dl>
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<p>Get the shapes that are in the same cell as the defined bounding box.</p>
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<dl class="function">
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<dt id="Spatialhash:register">
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<code class="descname">Spatialhash:register</code><span class="sig-paren">(</span><em>obj</em>, <em>x1</em>, <em>y1</em>, <em>x2</em>, <em>y2</em><span class="sig-paren">)</span><a class="headerlink" href="#Spatialhash:register" title="Permalink to this definition">¶</a></dt>
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<dd><table class="docutils field-list" frame="void" rules="none">
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|
<col class="field-name" />
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<col class="field-body" />
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<tbody valign="top">
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<tr class="field-odd field"><th class="field-name">Arguments:</th><td class="field-body"><ul class="first last simple">
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<li><strong>obj</strong> (<em>mixed</em>) – Object to place in the hash. It can be of any type except <cite>nil</cite>.</li>
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<li><strong>x1,y1</strong> (<em>numbers</em>) – Upper left corner of the bounding box.</li>
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<li><strong>x2,y2</strong> (<em>numbers</em>) – Lower right corner of the bounding box.</li>
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</ul>
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</td>
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</tr>
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</tbody>
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</table>
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</dd></dl>
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<p>Insert an object into the hash using a given bounding box.</p>
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<p><strong>Example</strong>:</p>
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<div class="highlight-lua"><div class="highlight"><pre><span class="n">hash</span><span class="p">:</span><span class="n">register</span><span class="p">(</span><span class="n">shape</span><span class="p">,</span> <span class="n">shape</span><span class="p">:</span><span class="n">bbox</span><span class="p">())</span>
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</pre></div>
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</div>
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<dl class="function">
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<dt id="Spatialhash:remove">
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<code class="descname">Spatialhash:remove</code><span class="sig-paren">(</span><em>obj</em><span class="optional">[</span>, <em>x1</em>, <em>y1</em><span class="optional">[</span>, <em>x2</em>, <em>y2</em><span class="optional">]</span><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#Spatialhash:remove" title="Permalink to this definition">¶</a></dt>
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<dd><table class="docutils field-list" frame="void" rules="none">
|
|
<col class="field-name" />
|
|
<col class="field-body" />
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<tbody valign="top">
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<tr class="field-odd field"><th class="field-name">Arguments:</th><td class="field-body"><ul class="first last simple">
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<li><strong>obj</strong> (<em>mixed</em>) – The object to delete</li>
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<li><strong>x1,y1</strong> (<em>numbers</em>) – Upper left corner of the bounding box (optional).</li>
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<li><strong>x2,y2</strong> (<em>numbers</em>) – Lower right corner of the bounding box (optional).</li>
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</ul>
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</td>
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</tr>
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</tbody>
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</table>
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</dd></dl>
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<p>Remove an object from the hash using a bounding box.</p>
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<p>If no bounding box is given, search the whole hash to delete the object.</p>
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<p><strong>Example</strong>:</p>
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<div class="highlight-lua"><div class="highlight"><pre><span class="n">hash</span><span class="p">:</span><span class="n">remove</span><span class="p">(</span><span class="n">shape</span><span class="p">,</span> <span class="n">shape</span><span class="p">:</span><span class="n">bbox</span><span class="p">())</span>
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<span class="n">hash</span><span class="p">:</span><span class="n">remove</span><span class="p">(</span><span class="n">object_with_unknown_position</span><span class="p">)</span>
|
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</pre></div>
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</div>
|
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<dl class="function">
|
|
<dt id="Spatialhash:update">
|
|
<code class="descname">Spatialhash:update</code><span class="sig-paren">(</span><em>obj</em>, <em>x1</em>, <em>y1</em>, <em>x2</em>, <em>y2</em>, <em>x3</em>, <em>y3</em>, <em>x4</em>, <em>y4</em><span class="sig-paren">)</span><a class="headerlink" href="#Spatialhash:update" title="Permalink to this definition">¶</a></dt>
|
|
<dd><table class="docutils field-list" frame="void" rules="none">
|
|
<col class="field-name" />
|
|
<col class="field-body" />
|
|
<tbody valign="top">
|
|
<tr class="field-odd field"><th class="field-name">Arguments:</th><td class="field-body"><ul class="first last simple">
|
|
<li><strong>obj</strong> (<em>mixed</em>) – The object to be updated.</li>
|
|
<li><strong>x1,y1</strong> (<em>numbers</em>) – Upper left corner of the bounding box before the object was moved.</li>
|
|
<li><strong>x2,y2</strong> (<em>numbers</em>) – Lower right corner of the bounding box before the object was moved.</li>
|
|
<li><strong>x3,y3</strong> (<em>numbers</em>) – Upper left corner of the bounding box after the object was moved.</li>
|
|
<li><strong>x4,y4</strong> (<em>numbers</em>) – Lower right corner of the bounding box after the object was moved.</li>
|
|
</ul>
|
|
</td>
|
|
</tr>
|
|
</tbody>
|
|
</table>
|
|
</dd></dl>
|
|
|
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<p>Update an objects position given the old bounding box and the new bounding box.</p>
|
|
<p><strong>Example</strong>:</p>
|
|
<div class="highlight-lua"><div class="highlight"><pre><span class="n">hash</span><span class="p">:</span><span class="n">update</span><span class="p">(</span><span class="n">shape</span><span class="p">,</span> <span class="o">-</span><span class="mi">100</span><span class="p">,</span><span class="o">-</span><span class="mi">30</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span><span class="mi">60</span><span class="p">,</span> <span class="o">-</span><span class="mi">100</span><span class="p">,</span><span class="o">-</span><span class="mi">70</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span><span class="mi">20</span><span class="p">)</span>
|
|
</pre></div>
|
|
</div>
|
|
<dl class="function">
|
|
<dt id="Spatialhash:draw">
|
|
<code class="descname">Spatialhash:draw</code><span class="sig-paren">(</span><em>draw_mode</em><span class="optional">[</span>, <em>show_empty = true</em><span class="optional">[</span>, <em>print_key = false</em><span class="optional">]</span><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#Spatialhash:draw" title="Permalink to this definition">¶</a></dt>
|
|
<dd><table class="docutils field-list" frame="void" rules="none">
|
|
<col class="field-name" />
|
|
<col class="field-body" />
|
|
<tbody valign="top">
|
|
<tr class="field-odd field"><th class="field-name">Arguments:</th><td class="field-body"><ul class="first last simple">
|
|
<li><strong>draw_mode</strong> (<em>string</em>) – Either ‘fill’ or ‘line’. See the LÖVE wiki.</li>
|
|
<li><strong>show_empty</strong> (<em>boolean</em>) – Wether to draw empty cells (optional).</li>
|
|
<li><strong>print_key</strong> (<em>boolean</em>) – Wether to print cell coordinates (optional).</li>
|
|
</ul>
|
|
</td>
|
|
</tr>
|
|
</tbody>
|
|
</table>
|
|
</dd></dl>
|
|
|
|
<p>Draw hash cells on the screen, mostly for debug purposes</p>
|
|
<p><strong>Example</strong>:</p>
|
|
<div class="highlight-lua"><div class="highlight"><pre><span class="n">love</span><span class="p">.</span><span class="n">graphics</span><span class="p">.</span><span class="n">setColor</span><span class="p">(</span><span class="mi">160</span><span class="p">,</span><span class="mi">140</span><span class="p">,</span><span class="mi">100</span><span class="p">,</span><span class="mi">100</span><span class="p">)</span>
|
|
<span class="n">hash</span><span class="p">:</span><span class="n">draw</span><span class="p">(</span><span class="s1">'</span><span class="s">line'</span><span class="p">,</span> <span class="kc">true</span><span class="p">,</span> <span class="kc">true</span><span class="p">)</span>
|
|
<span class="n">hash</span><span class="p">:</span><span class="n">draw</span><span class="p">(</span><span class="s1">'</span><span class="s">fill'</span><span class="p">,</span> <span class="kc">false</span><span class="p">)</span>
|
|
</pre></div>
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