How to Loop function in a function

sai4 · May 11, 2013, 10:53am

Hello guys,

I’m a newbie to corona sdk trying to create a android game app ,i need some help from you guys

I’m trying to create a small game app where i need to toggle between images on touch

for e.g i have two images image1.png,image2.png

Both the images are displayed in the same position alternatively.

When game starts only image1.png will be displayed and image2.png will be invisible.

Image2.png will be displayed when image1.png is clicked, once this click happens … image2.png is displayed and image1.png will become invisible.

This cycle continues, its like a toggle effect where a user can toggle between two images for ‘n’ number of times

i’m struck at a phase where when i can display both the images only for the 1st time but I’m unable to display it for the next time…Dont know how to code further…i’m very new to corona sdk so please help me by altering my code or sending a new code or any reference links

Here is my lua code

object = display.newImage( "dice.png",150,150 ) object.xScale = 1 object.yScale = 1 object.id = "dice1" object.isVisible = true function object:touch( event ) if event.phase == "began" then print "Dice one rolled on " object.isVisible = false objectt = display.newImage( "dice2.png",345,150 ) objectt.xScale = 1 objectt.yScale = 1 function objectt:touch( event ) if event.phase == "began" then objectt.isVisible = false objectt = display.newImage("dice.png",150,150) objectt.xScale = 1 objectt.yScale = 1 print "Dice two rolled on " end return true end objectt:addEventListener( "touch", objectt ) end return true end object:addEventListener( "touch", object )

Waiting for quick reply

Regards

saideep

hatethinkingofnames · May 11, 2013, 4:05pm

Unfortunately in Lua you can’t change an image once you’ve declared it to a variable. You would have to remove it and re-do it. But for your case you don’t have to do such a thing.

dice1 = display.newImage("dice1.png", 150, 150 ) dice1.id = 1 &nbsp; dice2 = display.newImage("dice2.png", 150, 150 ) dice2. id = 2 dice2.isVisible = false &nbsp; function changeDice(event) &nbsp;&nbsp;&nbsp;&nbsp; if event.phase == "ended" then &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;local focus = event.target &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; if focus.id == 1 then dice1.isVisible = false dice2.isVisible = true &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; elseif focus.id == 2 then dice1.isVisible = true dice2.isVisible = false &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; end &nbsp;&nbsp;&nbsp;&nbsp; end end &nbsp; dice1:addEventListener( "touch", changeDice ) dice2:addEventListener( "touch", changeDice )

Haven’t tested it out but should work

roaminggamer · May 11, 2013, 4:38pm

Can I suggest you attach the listener to a group instead?

local dieGroup = display.newGroup() display.newImage( dieGroup &nbsp;"dice1.png", 150, 150 ) display.newImage( dieGroup &nbsp;"dice2.png", 150, 150 )&nbsp; dieGroup[2].isVisible = false local function onTouchDie( self, event ) &nbsp; &nbsp;local phase = event.phase &nbsp; &nbsp;if(phase == "ended") then -- Toggle both dice &nbsp; &nbsp; &nbsp; self[1].isVisible = not self[1].isVisible &nbsp; &nbsp; &nbsp; self[2].isVisible = not self[2].isVisible &nbsp; &nbsp;end &nbsp; &nbsp;return true end dieGroup.touch = onTouchDie dieGroup:addEventListener( "touch", dieGroup ) &nbsp;

sai4 · May 11, 2013, 6:11pm

Thanks @roaminggamer and @hatethinkingofnames for the prompt replies…we’ll get back to you…

rob · May 11, 2013, 6:36pm

Here is what I do in my apps:

[lua]

local soundFxOnSwitch, soundFxOffSwitch

local function soundToggle(event)
    if event.phase == “ended” then
        if gamesettings.soundOn then
            gamesettings.soundOn = false
            soundFxOnSwitch.isVisible = false
            soundFxOffSwitch.isVisible = true
        else
            gamesettings.soundOn = true
            soundFxOnSwitch.isVisible = true
            soundFxOffSwitch.isVisible = false
        end
    end
    return true
end

    soundFxOnSwitch = display.newImageRect(“images/switch_on.png”, 48, 36)
    soundFxOnSwitch.x = display.contentCenterX + 100
    soundFxOnSwitch.y = display.contentCenterY

    soundFxOffSwitch = display.newImageRect(“images/switch_off.png”, 48, 36)
    soundFxOffSwitch.x = display.contentCenterX + 100
    soundFxOffSwitch.y = display.contentCenterY

soundFxOnSwitch:addEventListener(“touch”, soundToggle)
soundFxOffSwitch:addEventListener(“touch”, soundToggle)

    if gamesettings.soundOn then
        soundFxOnSwitch.isVisible = true
        soundFxOffSwitch.isVisible = false
    else
        soundFxOnSwitch.isVisible = false
        soundFxOffSwitch.isVisible = true
    end

[/lua]

hatethinkingofnames · May 11, 2013, 4:05pm