Tap on display objects in Corona SDK

0
votes

I'm trying to print taps from 3 different display objects but more than the one tapped are printed in the Terminal. They need their own specific function but that's not possible as of now. What should I do? I am new to Corona and LUA.

-- BOBLER DISPLAY OBJEKTER

local sport1 = display.newImage("images/sport1.png")

sport1.id = "mySport1"

sport1.x = 120

sport1.y = 90

sport1:scale(1,1)

local gossip1 = display.newImage("images/gossip1.png")

gossip1.id = "myGossip1"

gossip1.x = 400

gossip1.y = 120

gossip1:scale(1,1)

local kultur1 = display.newImage("images/kultur1.png")

kultur1.id = "myKultur1"

kultur1.x = 250

kultur1.y = 200

kultur1:scale(1,1)

local function onSport1Tap( self, event )

print(self.id .. " was tapped." )

end

local function onGossip1Tap( self, event )

print(self.id .. " was tapped." )

end

local function onKultur1Tap( self, event )

print(self.id .. " was tapped." )

end

-- TAP addEVENTLISTENER

sport1.tap = onSport1Tap

sport1:addEventListener( "tap", sport1 )

gossip1.tap = onGossip1Tap

gossip1:addEventListener( "tap", gossip1 )

kultur1.tap = onKultur1Tap

kultur1:addEventListener( "tap", kultur1 )

2
coronasdkevent-listenertap

2 Answers

1
votes

I suggest you do the following things:

  1. Use this function for tap/touch events:

    function sport1:touch(e)
    if e.phase == "ended" then
        print(self.id.." was tapped")
    end
end

  2. Use tables to create your objects more effectively, especially if you plan on adding more objects.

Here is an example of how:

local objects = {}

object[ 1 ] = {id = mySport1, x = 120, y = 90} --by the way, the scale is (1,1) on default

object[ 2 ] = {...}

object[ 3 ] = {...}

Then one can easily create the information for all of them using for loops:

for i = 1, #objects do

local object[i].img = display.newImage("images/"..object[i].id..".png")

object[i].img.x, object[i].img.y = object[i].x, object[i].y

local shape = object[i].img

function shape:touch(e)

if e.phase == "ended" then

print(object[i].id.."was tapped")

end

shape:addEventListener("touch")

end

I hope this was not too advanced... It took me a while to understand the potency of tables, but they become very effective when you have a lot of paramaters or objects needed to be created. Regarding the touch function, I have not really worked with tap - I just believe touch is better and simpler to use.

0
votes

just return true at the end of all your tap functions, like this:

local function onKultur1Tap( self, event )    
  print(self.id .. " was tapped." )
  return  true -- ** just it **
end