On collison

Hi there, Im trying to do this: when an object collides with another then after 5 seconds i display pop up window. I looked but cant figure out how to do this. Any help will be much appreciated . Thanks

Try using timer.performWithDelay(5000, showMessage)

upon collision

With showMessage being your message function

@Danny
thanks. My problem is i dont know how to write that code

for example like this

1
2
3

when obj1 collides with obj2 then
do something
end

object1.name = "object1"
 
object1:addEventListener("collision", oncollision)
 
local function oncollision(event)
                if event.phase == "began" and event.other.name == "object1" then
                timer.performWithDelay(5000, showmsg)
        end
end
 
local function showmsg(event)
--msg code here
end

object1.name = "object1"
object2.name = "object2"
 
object1:addEventListener("collision", oncollision)
 
local function oncollision(event)
                if event.phase == "began" and event.other.name == "object2" then
                timer.performWithDelay(5000, showmsg)
        end
end
 
local function showmsg()
--msg code here
end

Here how i did it and it doesnt work

local function onCollision (event )
        if event.phase == "began" and event.other.name == "shape" then
        timer.performWithDelay (5000, showmsg)
        end
end
 
local function shawmsg()
text = display.newText("Pop up goes here", 0 , 0 , native.systemFont , 16)
text:setTextColor (255)
text.x = 240
text.y = 160
group:insert(text)
end
 
rope:addEventListener("collision", onCollision)

make sure you add a name to the shape

1	shape.name = "shape"

I did but my showmsg() is not being called and the text is not displaying . I dont know why

try replacing:

1	timer.performWithDelay (5000, showmsg)

Still nothing . Well here is my entire code that might help

-----------------------------------------------------------------------------------
-- Play scene
-----------------------------------------------------------------------------------
module(...,package.seeall)
 
-----------------------------------------------------------------------------------
-- local objects declaration 
-----------------------------------------------------------------------------------
 
local group
local shape
local background 
local rope
local ground
local xover
local xover2
local shapeGroup
local musicButton
local soundButton
local i
local text
-----------------------------------------------------------------------------------
-- Start Physics engine 
-----------------------------------------------------------------------------------
 
physics.start()
 
 
 
 
-----------------------------------------------------------------------------------
--Button press handlers goes here
-----------------------------------------------------------------------------------
 
-- When shapes colided with rope then do this 
function onCollision (event )
        if event.phase == "began" and event.other.name == "rope" then
        timer.performWithDelay (5000, showmsg)
        end
end
 
local function shawmsg()
text = display.newText("Pop up goes here", 0 , 0 , native.systemFont , 16)
print "ok"
text:setTextColor (255)
text.x = 240
text.y = 160
group:insert(text)
end
 
 
-- When reset pressed then do this
function resetPressed(b)
        game.playEventSound(game.soundPressed)
        shapeGroup:removeSelf()
          -- Add squere shape to the scene
        shapeGroup = display.newGroup()
        shape = display.newImageRect("levels/shape.png" , 25 , 25)
        shapeGroup.x = 240
        shapeGroup.y = 120
        shapeGroup:insert(shape)
        group:insert(shapeGroup)
        physics.addBody(shapeGroup, {density = 3.0 , friction = 0.5, bounce = 0.3} )
      i = 1
local function shapePressed()
        physics.removeBody(shapeGroup)
        if i > 5 then return end        
        local function addNewBody()
                physics.addBody(shapeGroup, {density = 3.0 , friction = 0.5, bounce = 0.3} )
        end
    transition.to(shape, {time=10, xScale = shape.xScale + 0.3, yScale = shape.yScale + 0.3, onComplete=addNewBody }) 
    i = i+1 
    
end
   shape:addEventListener("tap", shapePressed)     
end
 
 
 --  When  Manu button pressed
local function menuPressed(b)
        game.playEventSound(game.soundPressed)
        game.changeScene("mainscene","overFromRight")
end
 
--Music button pressed function
local function musikPressed(b)
        if game.music then
                musicButton.image="buttons/musicover.png"
                game.music = false
                audio.stop()
        else
                musicButton.image="buttons/musicicon.png"
                audio.play(game.musicStream,{channel=1,loops=-1})
        end
        game.playEventSound(game.soundPressed)
end
 
-- Sound button pressed function
local function soundPressed(b)
        if game.sound then
                soundButton.image="buttons/soundover.png"
                game.sound = false
        else
                soundButton.image="buttons/soundicon.png"
                game.sound = true
        end
        game.playEventSound(game.soundPressed)
end
 
-----------------------------------------------------------------------------------
 
-- Shapes fucnctions are here to detect touch and physics bodys
-----------------------------------------------------------------------------------
 
 
i = 1
local function shapePressed()
        physics.removeBody(shapeGroup)
        if i > 5 then return end        
        local function addNewBody()
                physics.addBody(shapeGroup, {density = 3.0 , friction = 0.5, bounce = 0.3} )
        end
    transition.to(shape, {time=10, xScale = shape.xScale + 0.5, yScale = shape.yScale + 0.5, onComplete=addNewBody }) 
    --transition.to(shape, {time=10, width = shape.width * 1.3, height = shape.height * 1.3, onComplete=addNewBody} )
    i = i+1 
end
 
 
 
-----------------------------------------------------------------------------------
-- Collision detection goes here
-----------------------------------------------------------------------------------
 
 
--[[ add collision to the shapes
local function onCollision (self , event)
        if (event.phase == "began" ) then
                end
end  ]]
 
-----------------------------------------------------------------------------------
-- All the scene objects must go here
-----------------------------------------------------------------------------------
 
function new()
        physics.start()
        group = display.newGroup()
 
                
        -- Add Background to the scene
        background = display.newImageRect( "backgrounds/bkg.png", 480, 320 )
        background.x = 240
        background.y = 160
        group:insert(background)
        
       
        
        -- Add rope to the scene
        rope =display.newImageRect ( "levels/rope.png", 480, 9)
        rope.x = 240
        rope.y = 110
        rope.name = "rope"
        group:insert(rope)
        
        -- Add ground to the scene 
        ground = display.newImageRect ("levels/ground.png", 200, 64)
        ground.x = 240
        ground.y = 210
        group:insert (ground)
        
        
        -- Add squere shape to the scene
        shapeGroup = display.newGroup()
        shape = display.newImageRect("levels/shape.png" , 25 , 25)
        shapeGroup.x = 240
        shapeGroup.y = 120
        shapeGroup:insert(shape)
        group:insert(shapeGroup)
        
        
        
        
  
        
-----------------------------------------------------------------------------------
 
-- All the buttons must be created here
-----------------------------------------------------------------------------------
 
        button:create(group,1,{x=45,y=295,w=40,h=40,handler=menuPressed},"buttons/menuicon.png")
        button:create(group,1,{x=130,y=300,w=71,h=21,handler=resetPressed}, "buttons/restarticon.png")
        soundButton=button:create(group,1,{x=450,y=300,w=34,h=28,handler=soundPressed}, "buttons/soundicon.png")
        if game.sound == false then soundButton.image="buttons/soundover.png" end
        musicButton=button:create(group,1,{x=400,y=300,w=34,h=31,handler=musikPressed}, "buttons/musicicon.png")
        if game.music == false then musicButton.image="buttons/musicover.png" end
        
        
       
-----------------------------------------------------------------------------------
-- All the event listeners must go here
-----------------------------------------------------------------------------------
 
        -- Squere shape event listener
        shapeGroup:addEventListener("tap", shapePressed)
        rope:addEventListener("collision", onCollision)
        
 
-----------------------------------------------------------------------------------
-- All the physics bodys must me created here
-----------------------------------------------------------------------------------
 
 
        -- Ground physics body
        physics.addBody(ground, "static",{density = 3.0 , friction = 0.5, bounce = 0.1 } )
        -- Squere shape physics body
        physics.addBody(shapeGroup, {density = 3.0 , friction = 0.5, bounce = 0.3} )
        -- Add rope physics body
        physics.addBody(rope, "static",{density = 0 , friction = 0, bounce = 0})
        
        
        
          
        return group
end

simple typo i think

change to :

function showmsg()
text = display.newText("Pop up goes here", 0 , 0 , native.systemFont , 16)
print "ok"
text:setTextColor (255)
text.x = 240
text.y = 160
group:insert(text)
end

Still no luck. Thanks

Try switching the onCollision() and shwmsg() positions in your code. Maybe the shwmsg function is not seen because it is after the call for it inside the onCollision function? Or you can try something like this at the top of your code:

Local showmsg, onCollision

That way the positions of those functions won't matter.

No sure...also, do you get any error messages?

Good luck!

Got it to work thanks man

That's great to hear! I am very happy for you. Just curious, was simply moving the functions? I was not sure about that suggestion but I am glad it help if that was the case.

In any event good luck for the rest of your app!

Yes just switching positions of functions. Thanks again

Thank you for the confirmation!

views:1985 update：2012/1/15 11:04:51


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