Question about physics.pause

helloworld2013d · October 25, 2013, 4:43pm

I have a simple code.

I want to make the all fall again everytime.

I use collision and physics.

I used the logic and the commands I found on Corona Docs.

but it’s not working.

I do need your help.

Thank you for your help in advanced.

this is the code

local physics = require "physics" physics.setDrawMode( "normal" ) -- "debug" -- "hybrid" -- "normal" physics.start() local function makeBall() &nbsp;&nbsp; &nbsp;ball = display.newCircle(300, 20, 30) &nbsp;&nbsp; &nbsp;ball.name = "ball" &nbsp;&nbsp; &nbsp;physics.addBody( ball, "dynamic", { density = 1.0, friction = 0.1, bounce = .9, radius = 17} ) end local function onCollisionRect(self, event) &nbsp;&nbsp; &nbsp;if event.other.name == "ball" then &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;physics.start( false )&nbsp;&nbsp; &nbsp; &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;display.remove( ball ) &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;makeBall() &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;physics.start( true ) &nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;end &nbsp; &nbsp;&nbsp; &nbsp;end rect = display.newRect(200, 700, 300, 10) physics.addBody( rect, "static", { density = 1.0, friction = 0.1, bounce = .9} ) rect.collision = onCollisionRect rect:addEventListener("collision", rect) makeBall()

The ball falls fine, the first time

then I remove the ball fine

recreate a new one

and no physics…

thanks again

ojnab · October 25, 2013, 6:09pm

Why do you call the physics.start in the collision function?

Try removing those.

You should also nil out the ball after removing it.

helloworld2013d · October 25, 2013, 8:48pm

I took physics out.

and I nil to ball…

and still the ball don’t falls again.

local physics = require "physics" physics.setDrawMode( "normal" ) -- "debug" -- "hybrid" -- "normal" physics.start() local function makeBall() &nbsp;&nbsp;&nbsp; ball = display.newCircle(300, 20, 30) &nbsp;&nbsp;&nbsp; ball.name = "ball" &nbsp;&nbsp;&nbsp; physics.addBody( ball, "dynamic", { density = 1.0, friction = 0.1, bounce = .9, radius = 17} ) end local function onCollisionRect(self, event) &nbsp;&nbsp;&nbsp; if event.other.name == "ball" then&nbsp; &nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; display.remove( ball ) &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ball = nil &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; makeBall() &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; end &nbsp; &nbsp;&nbsp;&nbsp; end rect = display.newRect(200, 700, 300, 10) physics.addBody( rect, "static", { density = 1.0, friction = 0.1, bounce = .9} ) rect.collision = onCollisionRect rect:addEventListener("collision", rect) makeBall()

Any idea?

ojnab · October 25, 2013, 9:26pm

Yes i know. You need to put in a small delay between the collision event and creating a new the ball.

like this:

timer.performWithDelay ( 10, makeBall )

From the corona docs:

You should not attempt to add a physics body during a collision event. Instead, wait until the next application cycle.

helloworld2013d · October 25, 2013, 9:52pm

I change the code for this

local physics = require "physics" physics.setDrawMode( "normal" ) -- "debug" -- "hybrid" -- "normal" physics.start() local function makeBall() &nbsp;&nbsp;&nbsp; ball = display.newCircle(300, 20, 30) &nbsp;&nbsp;&nbsp; ball.name = "ball" &nbsp;&nbsp;&nbsp; physics.addBody( ball, "dynamic", { density = 1.0, friction = 0.1, bounce = .9, radius = 17} ) end local function onCollisionRect(self, event) &nbsp;&nbsp;&nbsp; if event.other.name == "ball" then&nbsp; &nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; display.remove( ball ) &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ball = nil &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; makeBall() &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; end &nbsp; &nbsp;&nbsp;&nbsp; end rect = display.newRect(200, 700, 300, 10) physics.addBody( rect, "static", { density = 1.0, friction = 0.1, bounce = .9} ) rect.collision = onCollisionRect rect:addEventListener("collision", rect) timer.performWithDelay ( 20, makeBall )

And the ball still is there not falling…

you can run this code in your computer

and you can see…

I know, it might be very difficult to do this…

ojnab · October 25, 2013, 9:59pm

The problem is you are creating a new ball while a collision is going on,

that’s why you need to put in a small delay, so the new ball will be created after the collision is over.

So I meant like this:

local physics = require “physics”
physics.setDrawMode( “normal” ) – “debug” – “hybrid” – “normal”
physics.start()

local function makeBall()
    ball = display.newCircle(300, 20, 30)
    ball.name = “ball”
    physics.addBody( ball, “dynamic”, { density = 1.0, friction = 0.1, bounce = .9, radius = 17} )
end

local function onCollisionRect(self, event)
    if event.other.name == “ball” then
            display.remove( ball )
            ball = nil
  timer.performWithDelay ( 20, makeBall )
           end
    end

rect = display.newRect(200, 700, 300, 10)
physics.addBody( rect, “static”, { density = 1.0, friction = 0.1, bounce = .9} )
rect.collision = onCollisionRect
rect:addEventListener(“collision”, rect)

makeBall( )

helloworld2013d · October 26, 2013, 12:54am

Thank you very much

you are the best

that works great!!!

thank you…

ojnab · October 25, 2013, 6:09pm