17 lines
2.1 KiB
HTML
17 lines
2.1 KiB
HTML
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<div style="text-align:left;color:#000000; background-color:#ffffff; border:solid black 1px; padding:0.5em 1em 0.5em 1em; overflow:auto;font-size:small; font-family:monospace; "><em><span style="color:#236e25;">// Faked top down friction.<br />
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</span></em><br />
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<em><span style="color:#236e25;">// A pivot joint configured this way will calculate friction against the ground for games with a top down perspective.<br />
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// Because the joint correction is disabled, the joint will not recenter itself and only apply to the velocity.<br />
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// The force the joint applies when changing the velocity will be clamped by the max force<br />
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// and this causes it to work exactly like friction!<br />
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</span></em>cpConstraint *pivot = <span style="color:#003668;">cpSpaceAddConstraint</span>(space, <span style="color:#003668;">cpPivotJointNew2</span>(staticBody, body, cpvzero, cpvzero));<br />
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<span style="color:#003668;">cpConstraintSetMaxBias</span>(pivot, <span style="color:#0000ff;">0.0f</span>); <em><span style="color:#236e25;">// disable joint correction<br />
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</span></em><span style="color:#003668;">cpConstraintSetMaxForce</span>(pivot, <span style="color:#0000ff;">1000.0f</span>);<br />
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<br />
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<em><span style="color:#236e25;">// The pivot joint doesn't apply rotational forces, use a gear joint with a ratio of 1.0 for that.<br />
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</span></em>cpConstraint *gear = <span style="color:#003668;">cpSpaceAddConstraint</span>(space, <span style="color:#003668;">cpGearJointNew</span>(staticBody, body, <span style="color:#0000ff;">0.0f</span>, <span style="color:#0000ff;">1.0f</span>));<br />
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<span style="color:#003668;">cpConstraintSetMaxBias</span>(gear, <span style="color:#0000ff;">0.0f</span>); <em><span style="color:#236e25;">// disable joint correction<br />
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</span></em><span style="color:#003668;">cpConstraintSetMaxForce</span>(gear, <span style="color:#0000ff;">5000.0f</span>);<br />
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<br />
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<em><span style="color:#236e25;">// Also, instead of connecting the joints to a static body, you can connect them to an infinite mass rogue body.<br />
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// You can then use the rogue body as a control body to the connected body. See the Tank demo as an example.</span></em></div>
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