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<title>Box2D: b2ChainShape Class Reference</title>
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<div id="projectname">Box2D
 <span id="projectnumber">2.3.0</span>
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<div id="projectbrief">A 2D Physics Engine for Games</div>
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<a href="#pub-methods">Public Member Functions</a> |
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<div class="title">b2ChainShape Class Reference</div> </div>
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<p><code>#include <<a class="el" href="b2_chain_shape_8h_source.html">b2ChainShape.h</a>></code></p>
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Inheritance diagram for b2ChainShape:</div>
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<img src="classb2_chain_shape.png" usemap="#b2ChainShape_map" alt=""/>
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<table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pub-methods"></a>
Public Member Functions</h2></td></tr>
<tr class="memitem:a8c032394f5a85e7fc425a437e7689a18"><td class="memItemLeft" align="right" valign="top"><a id="a8c032394f5a85e7fc425a437e7689a18"></a>
 </td><td class="memItemRight" valign="bottom"><a class="el" href="classb2_chain_shape.html#a8c032394f5a85e7fc425a437e7689a18">~b2ChainShape</a> ()</td></tr>
<tr class="memdesc:a8c032394f5a85e7fc425a437e7689a18"><td class="mdescLeft"> </td><td class="mdescRight">The destructor frees the vertices using b2Free. <br /></td></tr>
<tr class="separator:a8c032394f5a85e7fc425a437e7689a18"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a434d4b61ab15726302ec5ad484011c33"><td class="memItemLeft" align="right" valign="top"><a id="a434d4b61ab15726302ec5ad484011c33"></a>
void </td><td class="memItemRight" valign="bottom"><a class="el" href="classb2_chain_shape.html#a434d4b61ab15726302ec5ad484011c33">Clear</a> ()</td></tr>
<tr class="memdesc:a434d4b61ab15726302ec5ad484011c33"><td class="mdescLeft"> </td><td class="mdescRight">Clear all data. <br /></td></tr>
<tr class="separator:a434d4b61ab15726302ec5ad484011c33"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ac257742a52cac391e25962a4c703fb06"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classb2_chain_shape.html#ac257742a52cac391e25962a4c703fb06">CreateLoop</a> (const <a class="el" href="structb2_vec2.html">b2Vec2</a> *vertices, int32 count)</td></tr>
<tr class="separator:ac257742a52cac391e25962a4c703fb06"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:aa0977339b743c05f2179939ccc38e7e0"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classb2_chain_shape.html#aa0977339b743c05f2179939ccc38e7e0">CreateChain</a> (const <a class="el" href="structb2_vec2.html">b2Vec2</a> *vertices, int32 count)</td></tr>
<tr class="separator:aa0977339b743c05f2179939ccc38e7e0"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:aeb2ddbe0c52a98885e91b7c8f597315b"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classb2_chain_shape.html#aeb2ddbe0c52a98885e91b7c8f597315b">SetPrevVertex</a> (const <a class="el" href="structb2_vec2.html">b2Vec2</a> &prevVertex)</td></tr>
<tr class="separator:aeb2ddbe0c52a98885e91b7c8f597315b"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a15c7c2821a52266ef57621ac7d34a95f"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classb2_chain_shape.html#a15c7c2821a52266ef57621ac7d34a95f">SetNextVertex</a> (const <a class="el" href="structb2_vec2.html">b2Vec2</a> &nextVertex)</td></tr>
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<tr class="memitem:ac72d2e67c739a1640e9ee751afe9bbe8"><td class="memItemLeft" align="right" valign="top"><a id="ac72d2e67c739a1640e9ee751afe9bbe8"></a>
<a class="el" href="classb2_shape.html">b2Shape</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="classb2_chain_shape.html#ac72d2e67c739a1640e9ee751afe9bbe8">Clone</a> (<a class="el" href="classb2_block_allocator.html">b2BlockAllocator</a> *allocator) const</td></tr>
<tr class="memdesc:ac72d2e67c739a1640e9ee751afe9bbe8"><td class="mdescLeft"> </td><td class="mdescRight">Implement <a class="el" href="classb2_shape.html">b2Shape</a>. Vertices are cloned using b2Alloc. <br /></td></tr>
<tr class="separator:ac72d2e67c739a1640e9ee751afe9bbe8"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a371b90f907f3b22e26db4d5d24560496"><td class="memItemLeft" align="right" valign="top">int32 </td><td class="memItemRight" valign="bottom"><a class="el" href="classb2_chain_shape.html#a371b90f907f3b22e26db4d5d24560496">GetChildCount</a> () const</td></tr>
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<tr class="memitem:abfe7f836d3c32dc06b920df61a74f412"><td class="memItemLeft" align="right" valign="top"><a id="abfe7f836d3c32dc06b920df61a74f412"></a>
void </td><td class="memItemRight" valign="bottom"><a class="el" href="classb2_chain_shape.html#abfe7f836d3c32dc06b920df61a74f412">GetChildEdge</a> (<a class="el" href="classb2_edge_shape.html">b2EdgeShape</a> *edge, int32 index) const</td></tr>
<tr class="memdesc:abfe7f836d3c32dc06b920df61a74f412"><td class="mdescLeft"> </td><td class="mdescRight">Get a child edge. <br /></td></tr>
<tr class="separator:abfe7f836d3c32dc06b920df61a74f412"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a2d2d59b49c2611ad65ed68b0943d642d"><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classb2_chain_shape.html#a2d2d59b49c2611ad65ed68b0943d642d">TestPoint</a> (const <a class="el" href="structb2_transform.html">b2Transform</a> &transform, const <a class="el" href="structb2_vec2.html">b2Vec2</a> &p) const</td></tr>
<tr class="separator:a2d2d59b49c2611ad65ed68b0943d642d"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a2ca535a3b3d1e54f5572a3ee617dac19"><td class="memItemLeft" align="right" valign="top"><a id="a2ca535a3b3d1e54f5572a3ee617dac19"></a>
bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classb2_chain_shape.html#a2ca535a3b3d1e54f5572a3ee617dac19">RayCast</a> (<a class="el" href="structb2_ray_cast_output.html">b2RayCastOutput</a> *output, const <a class="el" href="structb2_ray_cast_input.html">b2RayCastInput</a> &input, const <a class="el" href="structb2_transform.html">b2Transform</a> &transform, int32 childIndex) const</td></tr>
<tr class="memdesc:a2ca535a3b3d1e54f5572a3ee617dac19"><td class="mdescLeft"> </td><td class="mdescRight">Implement <a class="el" href="classb2_shape.html">b2Shape</a>. <br /></td></tr>
<tr class="separator:a2ca535a3b3d1e54f5572a3ee617dac19"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a612caee9cc6a62dec501a6b6059c13a8"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classb2_chain_shape.html#a612caee9cc6a62dec501a6b6059c13a8">ComputeAABB</a> (<a class="el" href="structb2_a_a_b_b.html">b2AABB</a> *aabb, const <a class="el" href="structb2_transform.html">b2Transform</a> &transform, int32 childIndex) const</td></tr>
<tr class="separator:a612caee9cc6a62dec501a6b6059c13a8"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a55efeb6d4005c1ca4b01cbcc5d7369db"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classb2_chain_shape.html#a55efeb6d4005c1ca4b01cbcc5d7369db">ComputeMass</a> (<a class="el" href="structb2_mass_data.html">b2MassData</a> *massData, float32 density) const</td></tr>
<tr class="separator:a55efeb6d4005c1ca4b01cbcc5d7369db"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="inherit_header pub_methods_classb2_shape"><td colspan="2" onclick="javascript:toggleInherit('pub_methods_classb2_shape')"><img src="closed.png" alt="-"/> Public Member Functions inherited from <a class="el" href="classb2_shape.html">b2Shape</a></td></tr>
<tr class="memitem:a600cceee6186d81bb1b8ab142324bba6 inherit pub_methods_classb2_shape"><td class="memItemLeft" align="right" valign="top">Type </td><td class="memItemRight" valign="bottom"><a class="el" href="classb2_shape.html#a600cceee6186d81bb1b8ab142324bba6">GetType</a> () const</td></tr>
<tr class="separator:a600cceee6186d81bb1b8ab142324bba6 inherit pub_methods_classb2_shape"><td class="memSeparator" colspan="2"> </td></tr>
</table><table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pub-attribs"></a>
Public Attributes</h2></td></tr>
<tr class="memitem:a481116a6886fb3880b13e55c966579da"><td class="memItemLeft" align="right" valign="top"><a id="a481116a6886fb3880b13e55c966579da"></a>
<a class="el" href="structb2_vec2.html">b2Vec2</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="classb2_chain_shape.html#a481116a6886fb3880b13e55c966579da">m_vertices</a></td></tr>
<tr class="memdesc:a481116a6886fb3880b13e55c966579da"><td class="mdescLeft"> </td><td class="mdescRight">The vertices. Owned by this class. <br /></td></tr>
<tr class="separator:a481116a6886fb3880b13e55c966579da"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ab2ad711781e6ac81179074e90e0e058b"><td class="memItemLeft" align="right" valign="top"><a id="ab2ad711781e6ac81179074e90e0e058b"></a>
int32 </td><td class="memItemRight" valign="bottom"><a class="el" href="classb2_chain_shape.html#ab2ad711781e6ac81179074e90e0e058b">m_count</a></td></tr>
<tr class="memdesc:ab2ad711781e6ac81179074e90e0e058b"><td class="mdescLeft"> </td><td class="mdescRight">The vertex count. <br /></td></tr>
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<tr class="memitem:a3a42d4c6b2421bc5badda3b6164949cf"><td class="memItemLeft" align="right" valign="top"><a id="a3a42d4c6b2421bc5badda3b6164949cf"></a>
<a class="el" href="structb2_vec2.html">b2Vec2</a> </td><td class="memItemRight" valign="bottom"><b>m_prevVertex</b></td></tr>
<tr class="separator:a3a42d4c6b2421bc5badda3b6164949cf"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:af3716ef780dd5bcd905e350d8854aaa2"><td class="memItemLeft" align="right" valign="top"><a id="af3716ef780dd5bcd905e350d8854aaa2"></a>
<a class="el" href="structb2_vec2.html">b2Vec2</a> </td><td class="memItemRight" valign="bottom"><b>m_nextVertex</b></td></tr>
<tr class="separator:af3716ef780dd5bcd905e350d8854aaa2"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a8a6ffbb9de0e2b8545c8b4fc8aa77249"><td class="memItemLeft" align="right" valign="top"><a id="a8a6ffbb9de0e2b8545c8b4fc8aa77249"></a>
bool </td><td class="memItemRight" valign="bottom"><b>m_hasPrevVertex</b></td></tr>
<tr class="separator:a8a6ffbb9de0e2b8545c8b4fc8aa77249"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a333b74486566e73c3cf1f7da5e69a96e"><td class="memItemLeft" align="right" valign="top"><a id="a333b74486566e73c3cf1f7da5e69a96e"></a>
bool </td><td class="memItemRight" valign="bottom"><b>m_hasNextVertex</b></td></tr>
<tr class="separator:a333b74486566e73c3cf1f7da5e69a96e"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="inherit_header pub_attribs_classb2_shape"><td colspan="2" onclick="javascript:toggleInherit('pub_attribs_classb2_shape')"><img src="closed.png" alt="-"/> Public Attributes inherited from <a class="el" href="classb2_shape.html">b2Shape</a></td></tr>
<tr class="memitem:adb051791133b24f53c6e9a565a7b7bbb inherit pub_attribs_classb2_shape"><td class="memItemLeft" align="right" valign="top"><a id="adb051791133b24f53c6e9a565a7b7bbb"></a>
Type </td><td class="memItemRight" valign="bottom"><b>m_type</b></td></tr>
<tr class="separator:adb051791133b24f53c6e9a565a7b7bbb inherit pub_attribs_classb2_shape"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a5de7a9bd3f9e72ef7025a65c304aaf1a inherit pub_attribs_classb2_shape"><td class="memItemLeft" align="right" valign="top"><a id="a5de7a9bd3f9e72ef7025a65c304aaf1a"></a>
float32 </td><td class="memItemRight" valign="bottom"><b>m_radius</b></td></tr>
<tr class="separator:a5de7a9bd3f9e72ef7025a65c304aaf1a inherit pub_attribs_classb2_shape"><td class="memSeparator" colspan="2"> </td></tr>
</table><table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="inherited"></a>
Additional Inherited Members</h2></td></tr>
<tr class="inherit_header pub_types_classb2_shape"><td colspan="2" onclick="javascript:toggleInherit('pub_types_classb2_shape')"><img src="closed.png" alt="-"/> Public Types inherited from <a class="el" href="classb2_shape.html">b2Shape</a></td></tr>
<tr class="memitem:a4c1f3a9ad6b3150bb90ad9018ca4b1e0 inherit pub_types_classb2_shape"><td class="memItemLeft" align="right" valign="top"><a id="a4c1f3a9ad6b3150bb90ad9018ca4b1e0"></a>enum  </td><td class="memItemRight" valign="bottom"><b>Type</b> { <br />
  <b>e_circle</b> = 0,
<b>e_edge</b> = 1,
<b>e_polygon</b> = 2,
<b>e_chain</b> = 3,
<br />
  <b>e_typeCount</b> = 4
<br />
}</td></tr>
<tr class="separator:a4c1f3a9ad6b3150bb90ad9018ca4b1e0 inherit pub_types_classb2_shape"><td class="memSeparator" colspan="2"> </td></tr>
</table>
<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><p>A chain shape is a free form sequence of line segments. The chain has two-sided collision, so you can use inside and outside collision. Therefore, you may use any winding order. Since there may be many vertices, they are allocated using b2Alloc. Connectivity information is used to create smooth collisions. WARNING: The chain will not collide properly if there are self-intersections. </p>
</div><h2 class="groupheader">Member Function Documentation</h2>
<a id="a612caee9cc6a62dec501a6b6059c13a8"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a612caee9cc6a62dec501a6b6059c13a8">◆ </a></span>ComputeAABB()</h2>
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<td class="memname">void b2ChainShape::ComputeAABB </td>
<td>(</td>
<td class="paramtype"><a class="el" href="structb2_a_a_b_b.html">b2AABB</a> * </td>
<td class="paramname"><em>aabb</em>, </td>
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<td class="paramkey"></td>
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<td class="paramtype">const <a class="el" href="structb2_transform.html">b2Transform</a> & </td>
<td class="paramname"><em>transform</em>, </td>
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<td class="paramtype">int32 </td>
<td class="paramname"><em>childIndex</em> </td>
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<td>)</td>
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<span class="mlabels"><span class="mlabel">virtual</span></span> </td>
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<dl class="section see"><dt>See also</dt><dd><a class="el" href="classb2_shape.html#a88e9807fab0c8ca9a98d8926e50a1411">b2Shape::ComputeAABB</a> </dd></dl>
<p>Implements <a class="el" href="classb2_shape.html#a88e9807fab0c8ca9a98d8926e50a1411">b2Shape</a>.</p>
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<a id="a55efeb6d4005c1ca4b01cbcc5d7369db"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a55efeb6d4005c1ca4b01cbcc5d7369db">◆ </a></span>ComputeMass()</h2>
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<td class="memname">void b2ChainShape::ComputeMass </td>
<td>(</td>
<td class="paramtype"><a class="el" href="structb2_mass_data.html">b2MassData</a> * </td>
<td class="paramname"><em>massData</em>, </td>
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<td class="paramtype">float32 </td>
<td class="paramname"><em>density</em> </td>
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<td>)</td>
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<p>Chains have zero mass. </p><dl class="section see"><dt>See also</dt><dd><a class="el" href="classb2_shape.html#a61b365526241b47f124789b0309cac69">b2Shape::ComputeMass</a> </dd></dl>
<p>Implements <a class="el" href="classb2_shape.html#a61b365526241b47f124789b0309cac69">b2Shape</a>.</p>
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<a id="aa0977339b743c05f2179939ccc38e7e0"></a>
<h2 class="memtitle"><span class="permalink"><a href="#aa0977339b743c05f2179939ccc38e7e0">◆ </a></span>CreateChain()</h2>
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<td class="memname">void b2ChainShape::CreateChain </td>
<td>(</td>
<td class="paramtype">const <a class="el" href="structb2_vec2.html">b2Vec2</a> * </td>
<td class="paramname"><em>vertices</em>, </td>
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<td class="paramtype">int32 </td>
<td class="paramname"><em>count</em> </td>
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<td>)</td>
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<p>Create a chain with isolated end vertices. </p><dl class="params"><dt>Parameters</dt><dd>
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<tr><td class="paramname">vertices</td><td>an array of vertices, these are copied </td></tr>
<tr><td class="paramname">count</td><td>the vertex count </td></tr>
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</dd>
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<h2 class="memtitle"><span class="permalink"><a href="#ac257742a52cac391e25962a4c703fb06">◆ </a></span>CreateLoop()</h2>
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<td class="memname">void b2ChainShape::CreateLoop </td>
<td>(</td>
<td class="paramtype">const <a class="el" href="structb2_vec2.html">b2Vec2</a> * </td>
<td class="paramname"><em>vertices</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">int32 </td>
<td class="paramname"><em>count</em> </td>
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<td>)</td>
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<p>Create a loop. This automatically adjusts connectivity. </p><dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">vertices</td><td>an array of vertices, these are copied </td></tr>
<tr><td class="paramname">count</td><td>the vertex count </td></tr>
</table>
</dd>
</dl>
</div>
</div>
<a id="a371b90f907f3b22e26db4d5d24560496"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a371b90f907f3b22e26db4d5d24560496">◆ </a></span>GetChildCount()</h2>
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<td class="memname">int32 b2ChainShape::GetChildCount </td>
<td>(</td>
<td class="paramname"></td><td>)</td>
<td> const</td>
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<span class="mlabels"><span class="mlabel">virtual</span></span> </td>
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<dl class="section see"><dt>See also</dt><dd><a class="el" href="classb2_shape.html#a05a3c445017d96df9238ceefe6ce37ab" title="Get the number of child primitives. ">b2Shape::GetChildCount</a> </dd></dl>
<p>Implements <a class="el" href="classb2_shape.html#a05a3c445017d96df9238ceefe6ce37ab">b2Shape</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#a15c7c2821a52266ef57621ac7d34a95f">◆ </a></span>SetNextVertex()</h2>
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<td class="memname">void b2ChainShape::SetNextVertex </td>
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<td class="paramtype">const <a class="el" href="structb2_vec2.html">b2Vec2</a> & </td>
<td class="paramname"><em>nextVertex</em></td><td>)</td>
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<p>Establish connectivity to a vertex that follows the last vertex. Don't call this for loops. </p>
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<h2 class="memtitle"><span class="permalink"><a href="#aeb2ddbe0c52a98885e91b7c8f597315b">◆ </a></span>SetPrevVertex()</h2>
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<td class="memname">void b2ChainShape::SetPrevVertex </td>
<td>(</td>
<td class="paramtype">const <a class="el" href="structb2_vec2.html">b2Vec2</a> & </td>
<td class="paramname"><em>prevVertex</em></td><td>)</td>
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<p>Establish connectivity to a vertex that precedes the first vertex. Don't call this for loops. </p>
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<h2 class="memtitle"><span class="permalink"><a href="#a2d2d59b49c2611ad65ed68b0943d642d">◆ </a></span>TestPoint()</h2>
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<td class="memname">bool b2ChainShape::TestPoint </td>
<td>(</td>
<td class="paramtype">const <a class="el" href="structb2_transform.html">b2Transform</a> & </td>
<td class="paramname"><em>transform</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const <a class="el" href="structb2_vec2.html">b2Vec2</a> & </td>
<td class="paramname"><em>p</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td> const</td>
</tr>
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<td class="mlabels-right">
<span class="mlabels"><span class="mlabel">virtual</span></span> </td>
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<p>This always return false. </p><dl class="section see"><dt>See also</dt><dd><a class="el" href="classb2_shape.html#a6ac968e403e2d93e8ae46d728a2e50fa">b2Shape::TestPoint</a> </dd></dl>
<p>Implements <a class="el" href="classb2_shape.html#a6ac968e403e2d93e8ae46d728a2e50fa">b2Shape</a>.</p>
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<hr/>The documentation for this class was generated from the following files:<ul>
<li><a class="el" href="b2_chain_shape_8h_source.html">b2ChainShape.h</a></li>
<li>b2ChainShape.cpp</li>
</ul>
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