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 <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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<li class="navelem"><a class="el" href="dir_a7f953fea4e008d17e00594b3bbaff29.html">Box2D</a></li><li class="navelem"><a class="el" href="dir_f938a2b4566b4bd7e1dc8e6edc30956c.html">Collision</a></li> </ul>
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<a href="#nested-classes">Classes</a> |
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<div class="title">b2Collision.h File Reference</div> </div>
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<div class="textblock"><code>#include <Box2D/Common/b2Math.h></code><br />
<code>#include <limits.h></code><br />
</div>
<p><a href="b2_collision_8h_source.html">Go to the source code of this file.</a></p>
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Classes</h2></td></tr>
<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct  </td><td class="memItemRight" valign="bottom"><a class="el" href="structb2_contact_feature.html">b2ContactFeature</a></td></tr>
<tr class="separator:"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">union  </td><td class="memItemRight" valign="bottom"><a class="el" href="unionb2_contact_i_d.html">b2ContactID</a></td></tr>
<tr class="memdesc:"><td class="mdescLeft"> </td><td class="mdescRight">Contact ids to facilitate warm starting. <a href="unionb2_contact_i_d.html#details">More...</a><br /></td></tr>
<tr class="separator:"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct  </td><td class="memItemRight" valign="bottom"><a class="el" href="structb2_manifold_point.html">b2ManifoldPoint</a></td></tr>
<tr class="separator:"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct  </td><td class="memItemRight" valign="bottom"><a class="el" href="structb2_manifold.html">b2Manifold</a></td></tr>
<tr class="separator:"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct  </td><td class="memItemRight" valign="bottom"><a class="el" href="structb2_world_manifold.html">b2WorldManifold</a></td></tr>
<tr class="memdesc:"><td class="mdescLeft"> </td><td class="mdescRight">This is used to compute the current state of a contact manifold. <a href="structb2_world_manifold.html#details">More...</a><br /></td></tr>
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<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct  </td><td class="memItemRight" valign="bottom"><a class="el" href="structb2_clip_vertex.html">b2ClipVertex</a></td></tr>
<tr class="memdesc:"><td class="mdescLeft"> </td><td class="mdescRight">Used for computing contact manifolds. <a href="structb2_clip_vertex.html#details">More...</a><br /></td></tr>
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<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct  </td><td class="memItemRight" valign="bottom"><a class="el" href="structb2_ray_cast_input.html">b2RayCastInput</a></td></tr>
<tr class="memdesc:"><td class="mdescLeft"> </td><td class="mdescRight">Ray-cast input data. The ray extends from p1 to p1 + maxFraction * (p2 - p1). <a href="structb2_ray_cast_input.html#details">More...</a><br /></td></tr>
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<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct  </td><td class="memItemRight" valign="bottom"><a class="el" href="structb2_ray_cast_output.html">b2RayCastOutput</a></td></tr>
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<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct  </td><td class="memItemRight" valign="bottom"><a class="el" href="structb2_a_a_b_b.html">b2AABB</a></td></tr>
<tr class="memdesc:"><td class="mdescLeft"> </td><td class="mdescRight">An axis aligned bounding box. <a href="structb2_a_a_b_b.html#details">More...</a><br /></td></tr>
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="enum-members"></a>
Enumerations</h2></td></tr>
<tr class="memitem:a0a894e3715ce8c61b7958dd6e083663d"><td class="memItemLeft" align="right" valign="top">enum  </td><td class="memItemRight" valign="bottom"><a class="el" href="b2_collision_8h.html#a0a894e3715ce8c61b7958dd6e083663d">b2PointState</a> { <a class="el" href="b2_collision_8h.html#a0a894e3715ce8c61b7958dd6e083663da7ce77ce1a592f49d92939997976c217b">b2_nullState</a>,
<a class="el" href="b2_collision_8h.html#a0a894e3715ce8c61b7958dd6e083663dac60dc479bee2089a695b37948179b3d4">b2_addState</a>,
<a class="el" href="b2_collision_8h.html#a0a894e3715ce8c61b7958dd6e083663dafb032f2175741fa95361e55d1c069e0a">b2_persistState</a>,
<a class="el" href="b2_collision_8h.html#a0a894e3715ce8c61b7958dd6e083663da42ca6d7de57b948c8c895cd6f51ee8be">b2_removeState</a>
}</td></tr>
<tr class="memdesc:a0a894e3715ce8c61b7958dd6e083663d"><td class="mdescLeft"> </td><td class="mdescRight">This is used for determining the state of contact points. <a href="b2_collision_8h.html#a0a894e3715ce8c61b7958dd6e083663d">More...</a><br /></td></tr>
<tr class="separator:a0a894e3715ce8c61b7958dd6e083663d"><td class="memSeparator" colspan="2"> </td></tr>
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Functions</h2></td></tr>
<tr class="memitem:a401e2747d276e9fbfd131989e02ff568"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="b2_collision_8h.html#a401e2747d276e9fbfd131989e02ff568">b2GetPointStates</a> (<a class="el" href="b2_collision_8h.html#a0a894e3715ce8c61b7958dd6e083663d">b2PointState</a> state1[<a class="el" href="b2_settings_8h.html#aa5f44cc9edf711433dea2b2ec94f3c42">b2_maxManifoldPoints</a>], <a class="el" href="b2_collision_8h.html#a0a894e3715ce8c61b7958dd6e083663d">b2PointState</a> state2[<a class="el" href="b2_settings_8h.html#aa5f44cc9edf711433dea2b2ec94f3c42">b2_maxManifoldPoints</a>], const <a class="el" href="structb2_manifold.html">b2Manifold</a> *manifold1, const <a class="el" href="structb2_manifold.html">b2Manifold</a> *manifold2)</td></tr>
<tr class="separator:a401e2747d276e9fbfd131989e02ff568"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ab8a1bf2c6a9453307466f4870c1fa333"><td class="memItemLeft" align="right" valign="top"><a id="ab8a1bf2c6a9453307466f4870c1fa333"></a>
void </td><td class="memItemRight" valign="bottom"><a class="el" href="b2_collision_8h.html#ab8a1bf2c6a9453307466f4870c1fa333">b2CollideCircles</a> (<a class="el" href="structb2_manifold.html">b2Manifold</a> *manifold, const <a class="el" href="classb2_circle_shape.html">b2CircleShape</a> *circleA, const <a class="el" href="structb2_transform.html">b2Transform</a> &xfA, const <a class="el" href="classb2_circle_shape.html">b2CircleShape</a> *circleB, const <a class="el" href="structb2_transform.html">b2Transform</a> &xfB)</td></tr>
<tr class="memdesc:ab8a1bf2c6a9453307466f4870c1fa333"><td class="mdescLeft"> </td><td class="mdescRight">Compute the collision manifold between two circles. <br /></td></tr>
<tr class="separator:ab8a1bf2c6a9453307466f4870c1fa333"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a30da13c857596fbefa40b47c3e1e78d0"><td class="memItemLeft" align="right" valign="top"><a id="a30da13c857596fbefa40b47c3e1e78d0"></a>
void </td><td class="memItemRight" valign="bottom"><a class="el" href="b2_collision_8h.html#a30da13c857596fbefa40b47c3e1e78d0">b2CollidePolygonAndCircle</a> (<a class="el" href="structb2_manifold.html">b2Manifold</a> *manifold, const <a class="el" href="classb2_polygon_shape.html">b2PolygonShape</a> *polygonA, const <a class="el" href="structb2_transform.html">b2Transform</a> &xfA, const <a class="el" href="classb2_circle_shape.html">b2CircleShape</a> *circleB, const <a class="el" href="structb2_transform.html">b2Transform</a> &xfB)</td></tr>
<tr class="memdesc:a30da13c857596fbefa40b47c3e1e78d0"><td class="mdescLeft"> </td><td class="mdescRight">Compute the collision manifold between a polygon and a circle. <br /></td></tr>
<tr class="separator:a30da13c857596fbefa40b47c3e1e78d0"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a2f7b9859479384c0e2cceb9e7744afcb"><td class="memItemLeft" align="right" valign="top"><a id="a2f7b9859479384c0e2cceb9e7744afcb"></a>
void </td><td class="memItemRight" valign="bottom"><a class="el" href="b2_collision_8h.html#a2f7b9859479384c0e2cceb9e7744afcb">b2CollidePolygons</a> (<a class="el" href="structb2_manifold.html">b2Manifold</a> *manifold, const <a class="el" href="classb2_polygon_shape.html">b2PolygonShape</a> *polygonA, const <a class="el" href="structb2_transform.html">b2Transform</a> &xfA, const <a class="el" href="classb2_polygon_shape.html">b2PolygonShape</a> *polygonB, const <a class="el" href="structb2_transform.html">b2Transform</a> &xfB)</td></tr>
<tr class="memdesc:a2f7b9859479384c0e2cceb9e7744afcb"><td class="mdescLeft"> </td><td class="mdescRight">Compute the collision manifold between two polygons. <br /></td></tr>
<tr class="separator:a2f7b9859479384c0e2cceb9e7744afcb"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:aee6f752fdf8c89152e824da12e944733"><td class="memItemLeft" align="right" valign="top"><a id="aee6f752fdf8c89152e824da12e944733"></a>
void </td><td class="memItemRight" valign="bottom"><a class="el" href="b2_collision_8h.html#aee6f752fdf8c89152e824da12e944733">b2CollideEdgeAndCircle</a> (<a class="el" href="structb2_manifold.html">b2Manifold</a> *manifold, const <a class="el" href="classb2_edge_shape.html">b2EdgeShape</a> *polygonA, const <a class="el" href="structb2_transform.html">b2Transform</a> &xfA, const <a class="el" href="classb2_circle_shape.html">b2CircleShape</a> *circleB, const <a class="el" href="structb2_transform.html">b2Transform</a> &xfB)</td></tr>
<tr class="memdesc:aee6f752fdf8c89152e824da12e944733"><td class="mdescLeft"> </td><td class="mdescRight">Compute the collision manifold between an edge and a circle. <br /></td></tr>
<tr class="separator:aee6f752fdf8c89152e824da12e944733"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a5d0c5fab412d5ca886b1965666b16d99"><td class="memItemLeft" align="right" valign="top"><a id="a5d0c5fab412d5ca886b1965666b16d99"></a>
void </td><td class="memItemRight" valign="bottom"><a class="el" href="b2_collision_8h.html#a5d0c5fab412d5ca886b1965666b16d99">b2CollideEdgeAndPolygon</a> (<a class="el" href="structb2_manifold.html">b2Manifold</a> *manifold, const <a class="el" href="classb2_edge_shape.html">b2EdgeShape</a> *edgeA, const <a class="el" href="structb2_transform.html">b2Transform</a> &xfA, const <a class="el" href="classb2_polygon_shape.html">b2PolygonShape</a> *circleB, const <a class="el" href="structb2_transform.html">b2Transform</a> &xfB)</td></tr>
<tr class="memdesc:a5d0c5fab412d5ca886b1965666b16d99"><td class="mdescLeft"> </td><td class="mdescRight">Compute the collision manifold between an edge and a circle. <br /></td></tr>
<tr class="separator:a5d0c5fab412d5ca886b1965666b16d99"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a8b36e651798f55f2533f9837462ded41"><td class="memItemLeft" align="right" valign="top"><a id="a8b36e651798f55f2533f9837462ded41"></a>
int32 </td><td class="memItemRight" valign="bottom"><a class="el" href="b2_collision_8h.html#a8b36e651798f55f2533f9837462ded41">b2ClipSegmentToLine</a> (<a class="el" href="structb2_clip_vertex.html">b2ClipVertex</a> vOut[2], const <a class="el" href="structb2_clip_vertex.html">b2ClipVertex</a> vIn[2], const <a class="el" href="structb2_vec2.html">b2Vec2</a> &normal, float32 offset, int32 vertexIndexA)</td></tr>
<tr class="memdesc:a8b36e651798f55f2533f9837462ded41"><td class="mdescLeft"> </td><td class="mdescRight">Clipping for contact manifolds. <br /></td></tr>
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<tr class="memitem:ae7601420d0b42c1ee494e879dd2009a5"><td class="memItemLeft" align="right" valign="top"><a id="ae7601420d0b42c1ee494e879dd2009a5"></a>
bool </td><td class="memItemRight" valign="bottom"><a class="el" href="b2_collision_8h.html#ae7601420d0b42c1ee494e879dd2009a5">b2TestOverlap</a> (const <a class="el" href="classb2_shape.html">b2Shape</a> *shapeA, int32 indexA, const <a class="el" href="classb2_shape.html">b2Shape</a> *shapeB, int32 indexB, const <a class="el" href="structb2_transform.html">b2Transform</a> &xfA, const <a class="el" href="structb2_transform.html">b2Transform</a> &xfB)</td></tr>
<tr class="memdesc:ae7601420d0b42c1ee494e879dd2009a5"><td class="mdescLeft"> </td><td class="mdescRight">Determine if two generic shapes overlap. <br /></td></tr>
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<tr class="memitem:a3dea7a8a1115626c450a697f6c6bf97e"><td class="memItemLeft" align="right" valign="top"><a id="a3dea7a8a1115626c450a697f6c6bf97e"></a>
bool </td><td class="memItemRight" valign="bottom"><b>b2TestOverlap</b> (const <a class="el" href="structb2_a_a_b_b.html">b2AABB</a> &a, const <a class="el" href="structb2_a_a_b_b.html">b2AABB</a> &b)</td></tr>
<tr class="separator:a3dea7a8a1115626c450a697f6c6bf97e"><td class="memSeparator" colspan="2"> </td></tr>
</table><table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="var-members"></a>
Variables</h2></td></tr>
<tr class="memitem:a910fdc8a802b3cac220f2ee873109818"><td class="memItemLeft" align="right" valign="top"><a id="a910fdc8a802b3cac220f2ee873109818"></a>
const uint8 </td><td class="memItemRight" valign="bottom"><b>b2_nullFeature</b> = UCHAR_MAX</td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><p>Structures and functions used for computing contact points, distance queries, and TOI queries. </p>
</div><h2 class="groupheader">Enumeration Type Documentation</h2>
<a id="a0a894e3715ce8c61b7958dd6e083663d"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a0a894e3715ce8c61b7958dd6e083663d">◆ </a></span>b2PointState</h2>
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<td class="memname">enum <a class="el" href="b2_collision_8h.html#a0a894e3715ce8c61b7958dd6e083663d">b2PointState</a></td>
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</div><div class="memdoc">
<p>This is used for determining the state of contact points. </p>
<table class="fieldtable">
<tr><th colspan="2">Enumerator</th></tr><tr><td class="fieldname"><a id="a0a894e3715ce8c61b7958dd6e083663da7ce77ce1a592f49d92939997976c217b"></a>b2_nullState </td><td class="fielddoc"><p>point does not exist </p>
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<tr><td class="fieldname"><a id="a0a894e3715ce8c61b7958dd6e083663dac60dc479bee2089a695b37948179b3d4"></a>b2_addState </td><td class="fielddoc"><p>point was added in the update </p>
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<tr><td class="fieldname"><a id="a0a894e3715ce8c61b7958dd6e083663dafb032f2175741fa95361e55d1c069e0a"></a>b2_persistState </td><td class="fielddoc"><p>point persisted across the update </p>
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<tr><td class="fieldname"><a id="a0a894e3715ce8c61b7958dd6e083663da42ca6d7de57b948c8c895cd6f51ee8be"></a>b2_removeState </td><td class="fielddoc"><p>point was removed in the update </p>
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<h2 class="groupheader">Function Documentation</h2>
<a id="a401e2747d276e9fbfd131989e02ff568"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a401e2747d276e9fbfd131989e02ff568">◆ </a></span>b2GetPointStates()</h2>
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<td class="memname">void b2GetPointStates </td>
<td>(</td>
<td class="paramtype"><a class="el" href="b2_collision_8h.html#a0a894e3715ce8c61b7958dd6e083663d">b2PointState</a> </td>
<td class="paramname"><em>state1</em>[b2_maxManifoldPoints], </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="b2_collision_8h.html#a0a894e3715ce8c61b7958dd6e083663d">b2PointState</a> </td>
<td class="paramname"><em>state2</em>[b2_maxManifoldPoints], </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">const <a class="el" href="structb2_manifold.html">b2Manifold</a> * </td>
<td class="paramname"><em>manifold1</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">const <a class="el" href="structb2_manifold.html">b2Manifold</a> * </td>
<td class="paramname"><em>manifold2</em> </td>
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<td>)</td>
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<p>Compute the point states given two manifolds. The states pertain to the transition from manifold1 to manifold2. So state1 is either persist or remove while state2 is either add or persist. </p>
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