Difference between revisions of "B2.RevoluteJoint"
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A revolute joint constrains two bodies to share a common point while they are free to rotate about the point. The relative rotation about the shared point is the joint angle. You can limit the relative rotation with a joint limit that specifies a lower and upper angle. You can use a motor to drive the relative rotation about the shared point. A maximum motor torque is provided so that infinite forces are not generated. <br /> | A revolute joint constrains two bodies to share a common point while they are free to rotate about the point. The relative rotation about the shared point is the joint angle. You can limit the relative rotation with a joint limit that specifies a lower and upper angle. You can use a motor to drive the relative rotation about the shared point. A maximum motor torque is provided so that infinite forces are not generated. <br /> | ||
<br /> | <br /> | ||
| + | === Examples === | ||
| + | '''Revolute joint'''<br/> | ||
| + | <source lang="lua">--create empty box2d body for joint | ||
| + | local ground = world:createBody({}) | ||
| + | ground:setPosition(300, 480) | ||
| + | |||
| + | local jointDef = b2.createRevoluteJointDef(body, ground, 300, 300) | ||
| + | local revoluteJoint = world:createJoint(jointDef) | ||
| + | --will not let ball spin for ever | ||
| + | revoluteJoint:setMaxMotorTorque(1) | ||
| + | revoluteJoint:enableMotor(true)</source> | ||
{|- | {|- | ||
| style="width: 50%;"| | | style="width: 50%;"| | ||
Revision as of 10:58, 23 August 2018
Supported platforms: android, ios, mac, pc
Available since: Gideros 2011.6
Description
A revolute joint constrains two bodies to share a common point while they are free to rotate about the point. The relative rotation about the shared point is the joint angle. You can limit the relative rotation with a joint limit that specifies a lower and upper angle. You can use a motor to drive the relative rotation about the shared point. A maximum motor torque is provided so that infinite forces are not generated.
Examples
Revolute joint
--create empty box2d body for joint
local ground = world:createBody({})
ground:setPosition(300, 480)
local jointDef = b2.createRevoluteJointDef(body, ground, 300, 300)
local revoluteJoint = world:createJoint(jointDef)
--will not let ball spin for ever
revoluteJoint:setMaxMotorTorque(1)
revoluteJoint:enableMotor(true)
Methodsb2.RevoluteJoint:enableLimit - enables or disables the joint limit |
EventsConstants |
