touchJoint:removeSelf() not working to break Joint

Solar2D General Questions/Discussion
#1

My object attaches with a joint perfectly fine.

When I exit the area to breakjoint, it does display the break according to the printed message. It just doesn’t break the joint with otherobject.touchJoint:removeSelf()

This is based off the Radial Gravity project.

I’m just struggling with the Joint Break Point, it just isn’t breaking and keeps a hold of the object.

      local function BlackHoleCollision(self,event)         local otherobject = event.other                           local function joint(event)         local action = ""                  if ( event.source ) then action = event.source.action ; timer.cancel( event.source ) end                  if action == "makejoint" then         print (action)         self.isSensor = true             otherobject.hasJoint = true             otherobject.touchJoint = physics.newJoint( "touch", otherobject,otherobject.x, otherobject.y)             otherobject.touchJoint.frequency = magnetPull             otherobject.touchJoint.dampingRatio = 0.3             otherobject.touchJoint:setTarget(  self.x, self.y )             else if action == "breakjoint" then             print (action)         otherobject.hasJoint = false         otherobject.touchJoint:removeSelf()         otherobject.touchJoint = nil         end         end         end              if ( event.phase == "began" ) then         print("started")                     local tr = timer.performWithDelay(50, joint)         tr.action = "makejoint"         else if ( event.phase == "ended" ) then         print("ended")         local tr = timer.performWithDelay(50, joint)         tr.action = "breakjoint" end end         end field.collision = BlackHoleCollision     field:addEventListener( "collision", field ) end

This is the error:

2013-06-06 17:13:33.708 Corona Simulator[383:707] Runtime error ...dom/Desktop/Build 6/Class Objects/BlackholeClass.lua:58: attempt to call method 'removeSelf' (a nil value) stack traceback: &nbsp;&nbsp; &nbsp;[C]: in function 'removeSelf' &nbsp;&nbsp; &nbsp;...dom/Desktop/Build 6/Class Objects/BlackholeClass.lua:58: in function '\_listener' &nbsp;&nbsp; &nbsp;?: in function \<?:141\> &nbsp;&nbsp; &nbsp;?: in function \<?:218\>
#2

Hi @Dom Studios,

Unless this got posted into the forum incorrectly, are you intentionally using the nested…

[lua]

else if

[/lua]

Instead of the Lua…

[lua]

elseif

[/lua]

statements? This seems odd to me, and it might be messing up your logic handling.

Regards,

Brent

#3

thanks for the reply.

no I was using ‘else if’ but have now tried ‘elseif’

and I am still getting the same result

any other suggestions?

#4

Hello again,

Can you please post your revised code, with the “elseif” conditions in place?

Thanks,

Brent

#5

Hi,

Here is what my code looks like now.

local function BlackHoleCollision(self,event) &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;local otherobject = event.other &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp; &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp; &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;local function joint(event) &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;local action = "" &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp; &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;if ( event.source ) then action = event.source.action ; timer.cancel( event.source ) end &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp; &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;if action == "makejoint" then &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;print (action) &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;self.isSensor = true &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;otherobject.hasJoint = true &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;otherobject.touchJoint = physics.newJoint( "touch", otherobject,otherobject.x, otherobject.y) &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;otherobject.touchJoint.frequency = magnetPull &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;otherobject.touchJoint.dampingRatio = 0.3 &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;otherobject.touchJoint:setTarget(&nbsp; self.x, self.y ) &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;elseif action == "breakjoint" then &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;print (action) &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;otherobject.hasJoint = false &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;otherobject.touchJoint:removeSelf() &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;otherobject.touchJoint = nil &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;end &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;end &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp; if ( event.phase == "began" ) then &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;print("started")&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp; &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;local tr = timer.performWithDelay(50, joint) &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;tr.action = "makejoint" &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;elseif ( event.phase == "ended" ) then &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;print("ended") &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;local tr = timer.performWithDelay(50, joint) &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;tr.action = "breakjoint" end end&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp; field.collision = BlackHoleCollision&nbsp;&nbsp; &nbsp; field:addEventListener( "collision", field ) end
#6

I have found the problem.

if otherobject.hasJoint == false and action == "makejoint" then

and

elseif otherobject.hasJoint == true and action == "breakjoint" then

Thank you Brent for replying in trying to help

#7

Hi @Dom Studios,

Unless this got posted into the forum incorrectly, are you intentionally using the nested…

[lua]

else if

[/lua]

Instead of the Lua…

[lua]

elseif

[/lua]

statements? This seems odd to me, and it might be messing up your logic handling.

Regards,

Brent

#8

thanks for the reply.

no I was using ‘else if’ but have now tried ‘elseif’

and I am still getting the same result

any other suggestions?

#9

Hello again,

Can you please post your revised code, with the “elseif” conditions in place?

Thanks,

Brent

#10

Hi,

Here is what my code looks like now.

local function BlackHoleCollision(self,event) &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;local otherobject = event.other &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp; &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp; &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;local function joint(event) &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;local action = "" &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp; &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;if ( event.source ) then action = event.source.action ; timer.cancel( event.source ) end &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp; &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;if action == "makejoint" then &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;print (action) &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;self.isSensor = true &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;otherobject.hasJoint = true &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;otherobject.touchJoint = physics.newJoint( "touch", otherobject,otherobject.x, otherobject.y) &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;otherobject.touchJoint.frequency = magnetPull &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;otherobject.touchJoint.dampingRatio = 0.3 &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;otherobject.touchJoint:setTarget(&nbsp; self.x, self.y ) &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;elseif action == "breakjoint" then &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;print (action) &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;otherobject.hasJoint = false &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;otherobject.touchJoint:removeSelf() &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;otherobject.touchJoint = nil &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;end &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;end &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp; if ( event.phase == "began" ) then &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;print("started")&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp; &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;local tr = timer.performWithDelay(50, joint) &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;tr.action = "makejoint" &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;elseif ( event.phase == "ended" ) then &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;print("ended") &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;local tr = timer.performWithDelay(50, joint) &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;tr.action = "breakjoint" end end&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp; field.collision = BlackHoleCollision&nbsp;&nbsp; &nbsp; field:addEventListener( "collision", field ) end
#11

I have found the problem.

if otherobject.hasJoint == false and action == "makejoint" then

and

elseif otherobject.hasJoint == true and action == "breakjoint" then

Thank you Brent for replying in trying to help