B2.createGearJointDef

Available since: Gideros 2011.6

Description

Creates and returns a gear joint definition table.
(Please refer to b2.World:createJoint function for more information about all the information needed to create a gear joint).

(table) = b2.createGearJointDef(bodyA,bodyB,joint1,joint2,ratio)

Parameters

bodyA: (b2.Body) the first attached body
bodyB: (b2.Body) the second attached body
joint1: (b2.Joint) the first revolute/prismatic joint attached to the gear joint
joint2: (b2.Joint) the second revolute/prismatic joint attached to the gear joint
ratio: (number, default = 1) the gear ratio

Return values

Returns (table) A new gear joint definition table

Examples

Gear joint combining revolute and prismatic joints

--create empty box2d body for joint
local ground = world:createBody({})

--create revolute joint
--note that ground should be passed as first parameter here
local jointDef = b2.createRevoluteJointDef(ground, body1, 300, 300)
local revoluteJoint = world:createJoint(jointDef)
--set motor
revoluteJoint:setMaxMotorTorque(1)
revoluteJoint:enableMotor(true)

--axisx, 	axisy	values usually between 0 and 1
--note that ground should be passed as first parameter here
local jointDef = b2.createPrismaticJointDef(ground, body2, 350, 100, 0.3, 1)
local prismaticJoint = world:createJoint(jointDef)
--set motor
prismaticJoint:setMaxMotorForce(1)
prismaticJoint:enableMotor(true)


--create gear joint using two already created joints
local jointDef = b2.createGearJointDef(body1, body2, revoluteJoint, prismaticJoint, 1)
local gearJoint = world:createJoint(jointDef)