Difference between revisions of "B2.GearJoint"
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__NOTOC__ | __NOTOC__ | ||
| − | ''' | + | <!-- GIDEROSOBJ:b2.GearJoint --> |
| − | ''' | + | '''Supported platforms:''' [[File:Platform android.png]][[File:Platform ios.png]][[File:Platform mac.png]][[File:Platform pc.png]][[File:Platform html5.png]][[File:Platform winrt.png]][[File:Platform win32.png]]<br/> |
| − | ''' | + | '''Available since:''' Gideros 2011.6<br/> |
| − | === | + | '''Inherits from:''' [[b2.Joint]]<br/> |
| − | + | ||
| − | A gear joint is used to connect two joints together. Either joint can be a revolute or prismatic joint. You specify a gear ratio to bind the motions together: coordinate1 ratio * coordinate2 = constant The ratio can be negative or positive. If one joint is a revolute joint and the other joint is a prismatic joint, then the ratio will have units of length or units of 1/length. | + | === Description === |
| − | + | A gear joint is used to connect two joints together. Either joint can be a revolute or prismatic joint. You specify a gear ratio to bind the motions together: coordinate1 ratio * coordinate2 = constant The ratio can be negative or positive. If one joint is a revolute joint and the other joint is a prismatic joint, then the ratio will have units of length or units of 1/length. | |
| − | === | + | |
| − | '''Gear joint combining revolute and prismatic joints''' | + | === Examples === |
| − | < | + | '''Gear joint combining revolute and prismatic joints''' |
| + | <syntaxhighlight lang="lua"> | ||
| + | --create empty box2d body for joint | ||
local ground = world:createBody({}) | local ground = world:createBody({}) | ||
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revoluteJoint:enableMotor(true) | revoluteJoint:enableMotor(true) | ||
| − | --axisx, | + | --axisx, axisy values usually between 0 and 1 |
--note that ground should be passed as first parameter here | --note that ground should be passed as first parameter here | ||
local jointDef = b2.createPrismaticJointDef(ground, body2, 350, 100, 0.3, 1) | local jointDef = b2.createPrismaticJointDef(ground, body2, 350, 100, 0.3, 1) | ||
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prismaticJoint:setMaxMotorForce(1) | prismaticJoint:setMaxMotorForce(1) | ||
prismaticJoint:enableMotor(true) | prismaticJoint:enableMotor(true) | ||
| − | |||
--create gear joint using two already created joints | --create gear joint using two already created joints | ||
local jointDef = b2.createGearJointDef(body1, body2, revoluteJoint, prismaticJoint, 1) | local jointDef = b2.createGearJointDef(body1, body2, revoluteJoint, prismaticJoint, 1) | ||
| − | local gearJoint = world:createJoint(jointDef)</ | + | local gearJoint = world:createJoint(jointDef) |
| + | </syntaxhighlight> | ||
| + | |||
{|- | {|- | ||
| style="width: 50%; vertical-align:top;"| | | style="width: 50%; vertical-align:top;"| | ||
| − | === | + | === Methods === |
| − | [[ | + | [[b2.GearJoint:getRatio]] ''returns the gear ratio''<br/><!--GIDEROSMTD:b2.GearJoint:getRatio() returns the gear ratio--> |
| − | + | [[b2.GearJoint:setRatio]] ''sets the gear ratio''<br/><!--GIDEROSMTD:b2.GearJoint:setRatio(ratio) sets the gear ratio--> | |
| + | |||
| style="width: 50%; vertical-align:top;"| | | style="width: 50%; vertical-align:top;"| | ||
| − | === | + | === Events === |
| − | === | + | === Constants === |
|} | |} | ||
| + | |||
| + | ---- | ||
| + | *'''[[B2.Joint]]''' | ||
| + | *'''[[LiquidFun]]''' | ||
Latest revision as of 01:55, 1 December 2023
Supported platforms: 
Available since: Gideros 2011.6
Inherits from: b2.Joint
Description
A gear joint is used to connect two joints together. Either joint can be a revolute or prismatic joint. You specify a gear ratio to bind the motions together: coordinate1 ratio * coordinate2 = constant The ratio can be negative or positive. If one joint is a revolute joint and the other joint is a prismatic joint, then the ratio will have units of length or units of 1/length.
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)
Methodsb2.GearJoint:getRatio returns the gear ratio |
EventsConstants |
