DOUBLING objects, HELP!

Getting Started Newbie Questions
#1

Hello, there is a simple code which turn on a function for creating objects. Why does it makes 4 objects instead 2??? I tried other way with tables but result is same!

function createMultipleBalls(num)

for i=1, num do

shotBall = display.newImage(“shot_ball.png”)

shotBall.xScale = 0.7

shotBall.yScale = 0.7

shotBall.x = math.random(50,500)

shotBall.y = math.random(50,500)

shotBall:addEventListener(“touch”, dragBalls)

end

end

function touchScreen(event)

ki=2

if event.phase == “ended” then

–[[mBall:removeSelf()

createBall()–]]

Runtime:removeEventListener(“enterFrame”, fadeInReady)

mBall.enterFrame = bobUp

Runtime:addEventListener(“enterFrame”, mBall)

createMultipleBalls(2)

stopReady()

end

end

#2

I’m going to take a guess here and say that:

  1. You’re putting your touch listener on the Runtime.

  2. You never return true from your touch listener saying you’ve handled touch.

As for #1 I just helped another developer with this. Basically you shouldn’t put a touch handler on Runtime.  Yes you can, but you shouldn’t.  Instead create a full screen rectangle, make it invisible and hit testable and add your touch handler to it:

local fullScreenButton = display.newRect(display.contentCenterX, display.contentCenterY, display.acutalContentWidth, display.actualContentHeight) (add to a group if needed) fullScreenButton.isVisible = false fullScreenButton.isHitTestable = true fullScreenButton:addEventListener( "touch", touchScreen )

If you have other touchable items on the screen, they need to be layered above this one or they won’t get their touch events.

Rob

#3

Okay, Rob, I’ll try it thnx. But i noticed 1 thing - if I get out Listener from “function scene:show()” it’s going work correct.

#4

Your listener functions should be written in the scene’s main chunk above the scene:create() function. If you have variables you need access to in the listener function that you’ve declared local inside of one of the scene functions, simply forward declare the variable at the top.

#5

I’m going to take a guess here and say that:

  1. You’re putting your touch listener on the Runtime.

  2. You never return true from your touch listener saying you’ve handled touch.

As for #1 I just helped another developer with this. Basically you shouldn’t put a touch handler on Runtime.  Yes you can, but you shouldn’t.  Instead create a full screen rectangle, make it invisible and hit testable and add your touch handler to it:

local fullScreenButton = display.newRect(display.contentCenterX, display.contentCenterY, display.acutalContentWidth, display.actualContentHeight) (add to a group if needed) fullScreenButton.isVisible = false fullScreenButton.isHitTestable = true fullScreenButton:addEventListener( "touch", touchScreen )

If you have other touchable items on the screen, they need to be layered above this one or they won’t get their touch events.

Rob

#6

Okay, Rob, I’ll try it thnx. But i noticed 1 thing - if I get out Listener from “function scene:show()” it’s going work correct.

#7

Your listener functions should be written in the scene’s main chunk above the scene:create() function. If you have variables you need access to in the listener function that you’ve declared local inside of one of the scene functions, simply forward declare the variable at the top.