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<div id="projectname">Chipmunk2D Pro API Reference
 <span id="projectnumber">7.0.1</span>
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<a href="#pub-methods">Instance Methods</a> |
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<a href="class_chipmunk_gear_joint-members.html">List of all members</a> </div>
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<div class="title">ChipmunkGearJoint Class Reference</div> </div>
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<p>Gear joints constrain the rotational speed of one body to another.
<a href="interface_chipmunk_gear_joint.html#details">More...</a></p>
<p><code>#import <<a class="el" href="_chipmunk_constraint_8h_source.html">ChipmunkConstraint.h</a>></code></p>
<p>Inherits <a class="el" href="interface_chipmunk_constraint.html">ChipmunkConstraint</a>.</p>
<table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pub-methods"></a>
Instance Methods</h2></td></tr>
<tr class="memitem:a9b12a35f261c82ee633da3976ec5c670"><td class="memItemLeft" align="right" valign="top">(id) </td><td class="memItemRight" valign="bottom">- <a class="el" href="interface_chipmunk_gear_joint.html#a9b12a35f261c82ee633da3976ec5c670">initWithBodyA:bodyB:phase:ratio:</a></td></tr>
<tr class="memdesc:a9b12a35f261c82ee633da3976ec5c670"><td class="mdescLeft"> </td><td class="mdescRight">Initialize a gear joint between the given bodies. <a href="#a9b12a35f261c82ee633da3976ec5c670">More...</a><br/></td></tr>
<tr class="separator:a9b12a35f261c82ee633da3976ec5c670"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="inherit_header pub_methods_interface_chipmunk_constraint"><td colspan="2" onclick="javascript:toggleInherit('pub_methods_interface_chipmunk_constraint')"><img src="closed.png" alt="-"/> Instance Methods inherited from <a class="el" href="interface_chipmunk_constraint.html">ChipmunkConstraint</a></td></tr>
<tr class="memitem:a98a5a76a31ec2af56e604050e7cc3d62 inherit pub_methods_interface_chipmunk_constraint"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a98a5a76a31ec2af56e604050e7cc3d62"></a>
(void) </td><td class="memItemRight" valign="bottom">- <a class="el" href="interface_chipmunk_constraint.html#a98a5a76a31ec2af56e604050e7cc3d62">preSolve:</a></td></tr>
<tr class="memdesc:a98a5a76a31ec2af56e604050e7cc3d62 inherit pub_methods_interface_chipmunk_constraint"><td class="mdescLeft"> </td><td class="mdescRight">Override this method to update a constraints parameters just before running the physics each step. <br/></td></tr>
<tr class="separator:a98a5a76a31ec2af56e604050e7cc3d62 inherit pub_methods_interface_chipmunk_constraint"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a39ddc0c7f3b8994cbdc754caec26302b inherit pub_methods_interface_chipmunk_constraint"><td class="memItemLeft" align="right" valign="top">(void) </td><td class="memItemRight" valign="bottom">- <a class="el" href="interface_chipmunk_constraint.html#a39ddc0c7f3b8994cbdc754caec26302b">postSolve:</a></td></tr>
<tr class="memdesc:a39ddc0c7f3b8994cbdc754caec26302b inherit pub_methods_interface_chipmunk_constraint"><td class="mdescLeft"> </td><td class="mdescRight">Override this method to poll values from a constraint each frame after the physics runs. <a href="#a39ddc0c7f3b8994cbdc754caec26302b">More...</a><br/></td></tr>
<tr class="separator:a39ddc0c7f3b8994cbdc754caec26302b inherit pub_methods_interface_chipmunk_constraint"><td class="memSeparator" colspan="2"> </td></tr>
</table><table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pub-static-methods"></a>
Class Methods</h2></td></tr>
<tr class="memitem:a3a7335f5db5de91578546436de8b757c"><td class="memItemLeft" align="right" valign="top">(<a class="el" href="interface_chipmunk_gear_joint.html">ChipmunkGearJoint</a> *) </td><td class="memItemRight" valign="bottom">+ <a class="el" href="interface_chipmunk_gear_joint.html#a3a7335f5db5de91578546436de8b757c">gearJointWithBodyA:bodyB:phase:ratio:</a></td></tr>
<tr class="memdesc:a3a7335f5db5de91578546436de8b757c"><td class="mdescLeft"> </td><td class="mdescRight">Create an autoreleased gear joint between the given bodies. <a href="#a3a7335f5db5de91578546436de8b757c">More...</a><br/></td></tr>
<tr class="separator:a3a7335f5db5de91578546436de8b757c"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="inherit_header pub_static_methods_interface_chipmunk_constraint"><td colspan="2" onclick="javascript:toggleInherit('pub_static_methods_interface_chipmunk_constraint')"><img src="closed.png" alt="-"/> Class Methods inherited from <a class="el" href="interface_chipmunk_constraint.html">ChipmunkConstraint</a></td></tr>
<tr class="memitem:a1f1e4ca9ceced1674dafee3b37a40e99 inherit pub_static_methods_interface_chipmunk_constraint"><td class="memItemLeft" align="right" valign="top">(<a class="el" href="interface_chipmunk_constraint.html">ChipmunkConstraint</a> *) </td><td class="memItemRight" valign="bottom">+ <a class="el" href="interface_chipmunk_constraint.html#a1f1e4ca9ceced1674dafee3b37a40e99">constraintFromCPConstraint:</a></td></tr>
<tr class="memdesc:a1f1e4ca9ceced1674dafee3b37a40e99 inherit pub_static_methods_interface_chipmunk_constraint"><td class="mdescLeft"> </td><td class="mdescRight">Get the <a class="el" href="interface_chipmunk_constraint.html" title="Constraints connect two ChipmunkBody objects together.">ChipmunkConstraint</a> object associciated with a <a class="el" href="structcp_constraint.html">cpConstraint</a> pointer. <a href="#a1f1e4ca9ceced1674dafee3b37a40e99">More...</a><br/></td></tr>
<tr class="separator:a1f1e4ca9ceced1674dafee3b37a40e99 inherit pub_static_methods_interface_chipmunk_constraint"><td class="memSeparator" colspan="2"> </td></tr>
</table><table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="properties"></a>
Properties</h2></td></tr>
<tr class="memitem:ad7f4d8c51d82a8e746d3358bd1a31c99"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="ad7f4d8c51d82a8e746d3358bd1a31c99"></a>
<a class="el" href="group__basic_types.html#gac1ed65573e035bf892505768c852d8d3">cpFloat</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="interface_chipmunk_gear_joint.html#ad7f4d8c51d82a8e746d3358bd1a31c99">phase</a></td></tr>
<tr class="memdesc:ad7f4d8c51d82a8e746d3358bd1a31c99"><td class="mdescLeft"> </td><td class="mdescRight">The angular offset in radians. <br/></td></tr>
<tr class="separator:ad7f4d8c51d82a8e746d3358bd1a31c99"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:aea9abdff95bf74c5bd8d3612472b5385"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="aea9abdff95bf74c5bd8d3612472b5385"></a>
<a class="el" href="group__basic_types.html#gac1ed65573e035bf892505768c852d8d3">cpFloat</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="interface_chipmunk_gear_joint.html#aea9abdff95bf74c5bd8d3612472b5385">ratio</a></td></tr>
<tr class="memdesc:aea9abdff95bf74c5bd8d3612472b5385"><td class="mdescLeft"> </td><td class="mdescRight">The ratio of the rotational speeds. <br/></td></tr>
<tr class="separator:aea9abdff95bf74c5bd8d3612472b5385"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="inherit_header properties_interface_chipmunk_constraint"><td colspan="2" onclick="javascript:toggleInherit('properties_interface_chipmunk_constraint')"><img src="closed.png" alt="-"/> Properties inherited from <a class="el" href="interface_chipmunk_constraint.html">ChipmunkConstraint</a></td></tr>
<tr class="memitem:a78ffbfb6a51f7742b9c084abca8778f0 inherit properties_interface_chipmunk_constraint"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a78ffbfb6a51f7742b9c084abca8778f0"></a>
<a class="el" href="structcp_constraint.html">cpConstraint</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="interface_chipmunk_constraint.html#a78ffbfb6a51f7742b9c084abca8778f0">constraint</a></td></tr>
<tr class="memdesc:a78ffbfb6a51f7742b9c084abca8778f0 inherit properties_interface_chipmunk_constraint"><td class="mdescLeft"> </td><td class="mdescRight">Returns a pointer to the underlying <a class="el" href="structcp_constraint.html">cpConstraint</a> C struct. <br/></td></tr>
<tr class="separator:a78ffbfb6a51f7742b9c084abca8778f0 inherit properties_interface_chipmunk_constraint"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:aae60654a9744d40d272c77d41a781203 inherit properties_interface_chipmunk_constraint"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="aae60654a9744d40d272c77d41a781203"></a>
<a class="el" href="interface_chipmunk_body.html">ChipmunkBody</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="interface_chipmunk_constraint.html#aae60654a9744d40d272c77d41a781203">bodyA</a></td></tr>
<tr class="memdesc:aae60654a9744d40d272c77d41a781203 inherit properties_interface_chipmunk_constraint"><td class="mdescLeft"> </td><td class="mdescRight">The first <a class="el" href="interface_chipmunk_body.html" title="Rigid bodies are the basic unit of simulation in Chipmunk.">ChipmunkBody</a> the constraint controls. <br/></td></tr>
<tr class="separator:aae60654a9744d40d272c77d41a781203 inherit properties_interface_chipmunk_constraint"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ab3b008f612c712a3dce2e48c1a32f0c5 inherit properties_interface_chipmunk_constraint"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="ab3b008f612c712a3dce2e48c1a32f0c5"></a>
<a class="el" href="interface_chipmunk_body.html">ChipmunkBody</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="interface_chipmunk_constraint.html#ab3b008f612c712a3dce2e48c1a32f0c5">bodyB</a></td></tr>
<tr class="memdesc:ab3b008f612c712a3dce2e48c1a32f0c5 inherit properties_interface_chipmunk_constraint"><td class="mdescLeft"> </td><td class="mdescRight">The second <a class="el" href="interface_chipmunk_body.html" title="Rigid bodies are the basic unit of simulation in Chipmunk.">ChipmunkBody</a> the constraint controls. <br/></td></tr>
<tr class="separator:ab3b008f612c712a3dce2e48c1a32f0c5 inherit properties_interface_chipmunk_constraint"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ad6294d2fd2c320f9a1912c48464860f0 inherit properties_interface_chipmunk_constraint"><td class="memItemLeft" align="right" valign="top"><a class="el" href="group__basic_types.html#gac1ed65573e035bf892505768c852d8d3">cpFloat</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="interface_chipmunk_constraint.html#ad6294d2fd2c320f9a1912c48464860f0">maxForce</a></td></tr>
<tr class="memdesc:ad6294d2fd2c320f9a1912c48464860f0 inherit properties_interface_chipmunk_constraint"><td class="mdescLeft"> </td><td class="mdescRight">Maximum force this constraint is allowed to use (defalts to infinity). <a href="#ad6294d2fd2c320f9a1912c48464860f0">More...</a><br/></td></tr>
<tr class="separator:ad6294d2fd2c320f9a1912c48464860f0 inherit properties_interface_chipmunk_constraint"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a3c27862ffe47ca91d97ef6ff641bb468 inherit properties_interface_chipmunk_constraint"><td class="memItemLeft" align="right" valign="top"><a class="el" href="group__basic_types.html#gac1ed65573e035bf892505768c852d8d3">cpFloat</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="interface_chipmunk_constraint.html#a3c27862ffe47ca91d97ef6ff641bb468">errorBias</a></td></tr>
<tr class="memdesc:a3c27862ffe47ca91d97ef6ff641bb468 inherit properties_interface_chipmunk_constraint"><td class="mdescLeft"> </td><td class="mdescRight">The rate at which joint error is corrected. <a href="#a3c27862ffe47ca91d97ef6ff641bb468">More...</a><br/></td></tr>
<tr class="separator:a3c27862ffe47ca91d97ef6ff641bb468 inherit properties_interface_chipmunk_constraint"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a45acd3f4ab2c7633167a55280ab60042 inherit properties_interface_chipmunk_constraint"><td class="memItemLeft" align="right" valign="top"><a class="el" href="group__basic_types.html#gac1ed65573e035bf892505768c852d8d3">cpFloat</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="interface_chipmunk_constraint.html#a45acd3f4ab2c7633167a55280ab60042">maxBias</a></td></tr>
<tr class="memdesc:a45acd3f4ab2c7633167a55280ab60042 inherit properties_interface_chipmunk_constraint"><td class="mdescLeft"> </td><td class="mdescRight">Maximum rate (speed) that a joint can be corrected at (defaults to infinity). <a href="#a45acd3f4ab2c7633167a55280ab60042">More...</a><br/></td></tr>
<tr class="separator:a45acd3f4ab2c7633167a55280ab60042 inherit properties_interface_chipmunk_constraint"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a9455052cadfbcb61418bb80cbde6bbd4 inherit properties_interface_chipmunk_constraint"><td class="memItemLeft" align="right" valign="top">BOOL </td><td class="memItemRight" valign="bottom"><a class="el" href="interface_chipmunk_constraint.html#a9455052cadfbcb61418bb80cbde6bbd4">collideBodies</a></td></tr>
<tr class="memdesc:a9455052cadfbcb61418bb80cbde6bbd4 inherit properties_interface_chipmunk_constraint"><td class="mdescLeft"> </td><td class="mdescRight">Whether or not the connected bodies should checked for collisions. <a href="#a9455052cadfbcb61418bb80cbde6bbd4">More...</a><br/></td></tr>
<tr class="separator:a9455052cadfbcb61418bb80cbde6bbd4 inherit properties_interface_chipmunk_constraint"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:acfae278103bd74cc1a6ad6a2aad4f1fa inherit properties_interface_chipmunk_constraint"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="acfae278103bd74cc1a6ad6a2aad4f1fa"></a>
<a class="el" href="group__basic_types.html#gac1ed65573e035bf892505768c852d8d3">cpFloat</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="interface_chipmunk_constraint.html#acfae278103bd74cc1a6ad6a2aad4f1fa">impulse</a></td></tr>
<tr class="memdesc:acfae278103bd74cc1a6ad6a2aad4f1fa inherit properties_interface_chipmunk_constraint"><td class="mdescLeft"> </td><td class="mdescRight">Get the most recent impulse applied by this constraint. <br/></td></tr>
<tr class="separator:acfae278103bd74cc1a6ad6a2aad4f1fa inherit properties_interface_chipmunk_constraint"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ad59e9aa717a228e311deab4852d03dd8 inherit properties_interface_chipmunk_constraint"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="ad59e9aa717a228e311deab4852d03dd8"></a>
<a class="el" href="interface_chipmunk_space.html">ChipmunkSpace</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="interface_chipmunk_constraint.html#ad59e9aa717a228e311deab4852d03dd8">space</a></td></tr>
<tr class="memdesc:ad59e9aa717a228e311deab4852d03dd8 inherit properties_interface_chipmunk_constraint"><td class="mdescLeft"> </td><td class="mdescRight">Get the space the body is added to. <br/></td></tr>
<tr class="separator:ad59e9aa717a228e311deab4852d03dd8 inherit properties_interface_chipmunk_constraint"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a514c0e0f65e2a6ad70882b45a1ba0b02 inherit properties_interface_chipmunk_constraint"><td class="memItemLeft" align="right" valign="top">id </td><td class="memItemRight" valign="bottom"><a class="el" href="interface_chipmunk_constraint.html#a514c0e0f65e2a6ad70882b45a1ba0b02">userData</a></td></tr>
<tr class="memdesc:a514c0e0f65e2a6ad70882b45a1ba0b02 inherit properties_interface_chipmunk_constraint"><td class="mdescLeft"> </td><td class="mdescRight">An object that this constraint is associated with. <a href="#a514c0e0f65e2a6ad70882b45a1ba0b02">More...</a><br/></td></tr>
<tr class="separator:a514c0e0f65e2a6ad70882b45a1ba0b02 inherit properties_interface_chipmunk_constraint"><td class="memSeparator" colspan="2"> </td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><p>Gear joints constrain the rotational speed of one body to another. </p>
<p>A ratio of 1.0 will lock the rotation of two bodies together, and negative ratios will cause them to spin in opposite directions. You can also use gear joints as rotary servos by setting <a class="el" href="interface_chipmunk_constraint.html#ad6294d2fd2c320f9a1912c48464860f0" title="Maximum force this constraint is allowed to use (defalts to infinity).">ChipmunkConstraint.maxForce</a> and <a class="el" href="interface_chipmunk_constraint.html#a45acd3f4ab2c7633167a55280ab60042" title="Maximum rate (speed) that a joint can be corrected at (defaults to infinity).">ChipmunkConstraint.maxBias</a> to finite values and changing the <a class="el" href="interface_chipmunk_gear_joint.html#ad7f4d8c51d82a8e746d3358bd1a31c99" title="The angular offset in radians.">ChipmunkGearJoint.phase</a> property. </p>
</div><h2 class="groupheader">Method Documentation</h2>
<a class="anchor" id="a3a7335f5db5de91578546436de8b757c"></a>
<div class="memitem">
<div class="memproto">
<table class="memname">
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<td class="memname">+ (<a class="el" href="interface_chipmunk_gear_joint.html">ChipmunkGearJoint</a> *) gearJointWithBodyA: </td>
<td></td>
<td class="paramtype">(<a class="el" href="interface_chipmunk_body.html">ChipmunkBody</a> *) </td>
<td class="paramname"><em>a</em></td>
</tr>
<tr>
<td class="paramkey">bodyB:</td>
<td></td>
<td class="paramtype">(<a class="el" href="interface_chipmunk_body.html">ChipmunkBody</a> *) </td>
<td class="paramname"><em>b</em></td>
</tr>
<tr>
<td class="paramkey">phase:</td>
<td></td>
<td class="paramtype">(<a class="el" href="group__basic_types.html#gac1ed65573e035bf892505768c852d8d3">cpFloat</a>) </td>
<td class="paramname"><em>phase</em></td>
</tr>
<tr>
<td class="paramkey">ratio:</td>
<td></td>
<td class="paramtype">(<a class="el" href="group__basic_types.html#gac1ed65573e035bf892505768c852d8d3">cpFloat</a>) </td>
<td class="paramname"><em>ratio</em> </td>
</tr>
<tr>
<td></td>
<td></td>
<td></td><td></td>
</tr>
</table>
</div><div class="memdoc">
<p>Create an autoreleased gear joint between the given bodies. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">phase</td><td>The angular offset. </td></tr>
<tr><td class="paramname">ratio</td><td>The ratio of the rotational speeds. </td></tr>
</table>
</dd>
</dl>
</div>
</div>
<a class="anchor" id="a9b12a35f261c82ee633da3976ec5c670"></a>
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">- (id) initWithBodyA: </td>
<td></td>
<td class="paramtype">(<a class="el" href="interface_chipmunk_body.html">ChipmunkBody</a> *) </td>
<td class="paramname"><em>a</em></td>
</tr>
<tr>
<td class="paramkey">bodyB:</td>
<td></td>
<td class="paramtype">(<a class="el" href="interface_chipmunk_body.html">ChipmunkBody</a> *) </td>
<td class="paramname"><em>b</em></td>
</tr>
<tr>
<td class="paramkey">phase:</td>
<td></td>
<td class="paramtype">(<a class="el" href="group__basic_types.html#gac1ed65573e035bf892505768c852d8d3">cpFloat</a>) </td>
<td class="paramname"><em>phase</em></td>
</tr>
<tr>
<td class="paramkey">ratio:</td>
<td></td>
<td class="paramtype">(<a class="el" href="group__basic_types.html#gac1ed65573e035bf892505768c852d8d3">cpFloat</a>) </td>
<td class="paramname"><em>ratio</em> </td>
</tr>
<tr>
<td></td>
<td></td>
<td></td><td></td>
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</div><div class="memdoc">
<p>Initialize a gear joint between the given bodies. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">phase</td><td>The angular offset in radians. </td></tr>
<tr><td class="paramname">ratio</td><td>The ratio of the rotational speeds. </td></tr>
</table>
</dd>
</dl>
</div>
</div>
<hr/>The documentation for this class was generated from the following file:<ul>
<li><a class="el" href="_chipmunk_constraint_8h_source.html">ChipmunkConstraint.h</a></li>
</ul>
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