Difference between revisions of "B2.GearJoint"

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__NOTOC__
 
__NOTOC__
<languages />
 
 
<!-- GIDEROSOBJ:b2.GearJoint -->
 
<!-- 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/>
 
'''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/>
 
'''Available since:''' Gideros 2011.6<br/>
'''Inherits from:''' [[Special:MyLanguage/b2.Joint|b2.Joint]]<br/>
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'''Inherits from:''' [[b2.Joint]]<br/>
  
 
=== Description ===
 
=== Description ===
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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)
</source>
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</syntaxhighlight>
  
 
{|-
 
{|-
 
| style="width: 50%; vertical-align:top;"|
 
| style="width: 50%; vertical-align:top;"|
 
=== Methods ===
 
=== Methods ===
[[Special:MyLanguage/b2.GearJoint:getRatio|b2.GearJoint:getRatio]] ''returns the gear ratio''<br/><!-- GIDEROSMTD:b2.GearJoint:getRatio() returns the gear ratio -->
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[[b2.GearJoint:getRatio]] ''returns the gear ratio''<br/><!--GIDEROSMTD:b2.GearJoint:getRatio() returns the gear ratio-->
[[Special:MyLanguage/b2.GearJoint:setRatio|b2.GearJoint:setRatio]] ''sets the gear ratio''<br/><!-- GIDEROSMTD:b2.GearJoint:setRatio(ratio) sets the gear ratio -->
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[[b2.GearJoint:setRatio]] ''sets the gear ratio''<br/><!--GIDEROSMTD:b2.GearJoint:setRatio(ratio) sets the gear ratio-->
  
 
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Latest revision as of 01:55, 1 December 2023

Supported platforms: Platform android.pngPlatform ios.pngPlatform mac.pngPlatform pc.pngPlatform html5.pngPlatform winrt.pngPlatform win32.png
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)

Methods

b2.GearJoint:getRatio returns the gear ratio
b2.GearJoint:setRatio sets the gear ratio

Events

Constants