Pivot Joint Issues

Games
#1

Sorry if this is painfully obvious, but I cant seem to figure this out for the life of me. I’m simply trying to rotate this sprite like a wheel. However the rotor body just falls off the screen, instead of staying on top of the sensor and rotating.

[lua]function newRotor(x,y)
local rotor = display.newImage(“sprites/rotor.png”,x,y)
local rect = display.newRect( x+45, y+45, 5, 5 )
rect.isVisible = false
physics.addBody( rect, “static”,{ isSensor = true } )
local rotor_body = physics.addBody(rotor, { density = 1.0, friction = 0.3, bounce = 0.2 , radius = 50})

local myJoint = physics.newJoint( “pivot”, rect, rotor_body, rect.x,rect.y )
myJoint.isMotorEnabled = true
myJoint.motorSpeed = 10.00
myJoint.motorTorque = 20.00

end[/lua] [import]uid: 9484 topic_id: 17813 reply_id: 317813[/import]

#2

See i knew it would be something stupid, it finally clicked. Since I can’t delete this post Ill leave it up as a solution post for anyone who runs into this issue.

[lua]function newRotor(x,y)
local rotor = display.newImage(“sprites/rotor.png”,x,y)
local rect = display.newRect( x+45, y+45, 5, 5 )
rect.isVisible = false
physics.addBody( rect, “static”,{ isSensor = true } )
physics.addBody(rotor, { density = 1.0, friction = 0.3, bounce = 0.2 , radius = 50})

local myJoint = physics.newJoint( “pivot”, rect, rotor, rect.x,rect.y )
myJoint.isMotorEnabled = true
myJoint.motorSpeed = 10.00
myJoint.motorTorque = 20.00

end[/lua] [import]uid: 9484 topic_id: 17813 reply_id: 67978[/import]

#3

Hey, lancer, I’m glad you posted the fix. I’m pretty sure newbies will make similar mistakes, and seeing how you fixed it can drive home how to do it right.

Honestly, when I first started using physics, I couldn’t figure out how to get the joint working, and because I’ve found a work-around in a flash, I’ve avoided “joint” like a plague. Now I see it can’t be so bad. Hahaha.

Cheers,
Naomi [import]uid: 67217 topic_id: 17813 reply_id: 67990[/import]