movement of an object based on rotation of others

Getting Started Newbie Questions
#1

hey

I have a cross…and button which makes the cross rotate…when it rotates, that box should also move accordingly… see the pic to get clarified 

So when that cross rotates,box should also move 

#2

You could use a weld joint

https://docs.coronalabs.com/daily/guide/physics/physicsJoints/index.html#weld

#3

That didnt worked

cross = display.newImage("cross.png") cross.x , cross.y = centerX, centerY + 50 physics.addBody(cross,"static") star = display.newRect(0,0,80,80) star.x = cross.x + cross.width \* 0.3 star.y = cross.y - cross.height \* 0.3 physics.addBody(star,"static") pJoint = physics.newJoint("weld",star,cross,star.x,cross.x) local function onSwitchTouch( event ) -- body if (event.phase == "began") then trans = transition.to(cross,{rotation = cross.rotation + 90, time = 100}) end return true end switchBtn:addEventListener("touch",onSwitchTouch)
#4

It is because you are using transition.to

#5

So no other way ?

#6

Let me take a look

#7

Thanks for that ! :smiley:

#8

Could you not put them both into a display group and then rotate the group?

(At work at the mo so cannot test it!)

#9

NOpe… That too didn’t worked 

#10 
--Math functions local Cos = math.cos local Sin = math.sin local Rad = math.rad local Atan2 = math.atan2 local Deg = math.deg local physics = require("physics") local cross = display.newImage("cross.png") cross.x , cross.y = display.contentCenterX, display.contentCenterX + 50 physics.addBody(cross,"static") local star = display.newRect(0,0,80,80) star.x = cross.x + cross.width \* 0.3 star.y = cross.y - cross.height \* 0.3 physics.addBody(star,"static") local pJoint = physics.newJoint("weld",star,cross,star.x,cross.x) local angle = 90 local radius = (cross.height/2) local function onSwitchTouch( event ) if (event.phase == "began") then star.x = cross.x + Cos(Rad(angle)) \* radius star.y = cross.y + Sin(Rad(angle)) \* radius angle = angle + 45 cross.rotation = cross.rotation +45 end return true end local rect = display.newRect( display.contentCenterX, display.contentCenterY+150, 100, 100 ) rect:addEventListener("touch",onSwitchTouch)
#11

Worked! Thanks

#12

You could use a weld joint

https://docs.coronalabs.com/daily/guide/physics/physicsJoints/index.html#weld

#13

That didnt worked

cross = display.newImage("cross.png") cross.x , cross.y = centerX, centerY + 50 physics.addBody(cross,"static") star = display.newRect(0,0,80,80) star.x = cross.x + cross.width \* 0.3 star.y = cross.y - cross.height \* 0.3 physics.addBody(star,"static") pJoint = physics.newJoint("weld",star,cross,star.x,cross.x) local function onSwitchTouch( event ) -- body if (event.phase == "began") then trans = transition.to(cross,{rotation = cross.rotation + 90, time = 100}) end return true end switchBtn:addEventListener("touch",onSwitchTouch)
#14

It is because you are using transition.to

#15

So no other way ?

#16

Let me take a look

#17

Thanks for that ! :smiley:

#18

Could you not put them both into a display group and then rotate the group?

(At work at the mo so cannot test it!)

#19

NOpe… That too didn’t worked 

#20 
--Math functions local Cos = math.cos local Sin = math.sin local Rad = math.rad local Atan2 = math.atan2 local Deg = math.deg local physics = require("physics") local cross = display.newImage("cross.png") cross.x , cross.y = display.contentCenterX, display.contentCenterX + 50 physics.addBody(cross,"static") local star = display.newRect(0,0,80,80) star.x = cross.x + cross.width \* 0.3 star.y = cross.y - cross.height \* 0.3 physics.addBody(star,"static") local pJoint = physics.newJoint("weld",star,cross,star.x,cross.x) local angle = 90 local radius = (cross.height/2) local function onSwitchTouch( event ) if (event.phase == "began") then star.x = cross.x + Cos(Rad(angle)) \* radius star.y = cross.y + Sin(Rad(angle)) \* radius angle = angle + 45 cross.rotation = cross.rotation +45 end return true end local rect = display.newRect( display.contentCenterX, display.contentCenterY+150, 100, 100 ) rect:addEventListener("touch",onSwitchTouch)