Question about Removing object on tap

Getting Started Newbie Questions
#1

In my project, I create multiple objects from a single image file. On tap, I want their number to appear on the screen and the objects themselves to disappear. I took the counting function from the lessons. My code so far.

local tapCount = 0 local ballsTable = {} local centerX = display.contentCenterX local centerY = display.contentCenterY local height = display.contentHeight local width = display.contentWidth local background = display.newImageRect( "background.png", 360, 570 ) background.x = centerX background.y = centerY local tapText = display.newText( tapCount, centerX, 20, native.systemFont, 40 ) tapText:setFillColor( 0, 0, 0 ) local function tapCounter() tapCount = tapCount + 1 tapText.text = tapCount end local function getBall(imagePath, x, y) local ball = display.newImageRect("ball.png", 25, 25) ball.x = math.random(height) ball.y = math.random(width) return ball end local function createBalls() for i = 1, 30 do local ball = getBall("ball.png", math.random(height), math.random(width)) table.insert(ballsTable, ball) ball:addEventListener("tap", tapCounter) end end local function setup() math.randomseed(os.time()); createBalls() end setup()

Now I want to create a function that deletes the objects on tap. I found two functions that should do what I need, but I don’t know how to fit them into my project and where I should place the EventListener.

local function deleteBall() for i = #ballsTable, 1, -1 do local thisBall = ballsTable[i] display.remove( thisBall ) table.remove( ballsTable, i ) end end local function removeBall() for i=1,#ballsTable do local v = ballsTable[i] if ( v and v.id == event.target.id ) then table.remove( ballsTable,i ) break end v = nil end end

 

#2 
  local tapCount = 0 local ballsTable = {} local centerX = display.contentCenterX local centerY = display.contentCenterY local height = display.contentHeight local width = display.contentWidth   local background = display.newImageRect( "background.png", 360, 570 ) background.x = centerX background.y = centerY local tapText = display.newText( tapCount, centerX, 20, native.systemFont, 40 ) tapText:setFillColor( 0, 0, 0 )       local touchBall = function (event)      if event.phase == "began" then           local id = table.indexOf(ballsTable, event.target)           display.remove(event.target)      table.remove(ballsTable, id )      event.target = nil        end          end     local function tapCounter() tapCount = tapCount + 1     tapText.text = tapCount end   local function getBall(imagePath, x, y)     local ball = display.newImageRect("ball.png", 25, 25)     ball.x = math.random(height)     ball.y = math.random(width)     ball:addEventListener("touch",touchBall) return ball end   local function createBalls() for i = 1, 30 do         local ball = getBall("ball.png", math.random(height), math.random(width))         table.insert(ballsTable, ball) ball:addEventListener("tap", tapCounter) end end   local function setup() math.randomseed(os.time()); createBalls() end   setup()  
#3

Oh, thank you! This function works. I finally remove them. But the tapCounter() doesn’t work anymore.

I fixed it. I just replaced “tap” in createBalls() with “touch”.

Thank you very, very much!

#4 
  local tapCount = 0 local ballsTable = {} local centerX = display.contentCenterX local centerY = display.contentCenterY local height = display.contentHeight local width = display.contentWidth   local background = display.newImageRect( "background.png", 360, 570 ) background.x = centerX background.y = centerY local tapText = display.newText( tapCount, centerX, 20, native.systemFont, 40 ) tapText:setFillColor( 0, 0, 0 )       local touchBall = function (event)      if event.phase == "began" then           local id = table.indexOf(ballsTable, event.target)           display.remove(event.target)      table.remove(ballsTable, id )      event.target = nil        end          end     local function tapCounter() tapCount = tapCount + 1     tapText.text = tapCount end   local function getBall(imagePath, x, y)     local ball = display.newImageRect("ball.png", 25, 25)     ball.x = math.random(height)     ball.y = math.random(width)     ball:addEventListener("touch",touchBall) return ball end   local function createBalls() for i = 1, 30 do         local ball = getBall("ball.png", math.random(height), math.random(width))         table.insert(ballsTable, ball) ball:addEventListener("tap", tapCounter) end end   local function setup() math.randomseed(os.time()); createBalls() end   setup()  
#5

Oh, thank you! This function works. I finally remove them. But the tapCounter() doesn’t work anymore.

I fixed it. I just replaced “tap” in createBalls() with “touch”.

Thank you very, very much!