Lua Tic Tac Toe Tutorial in Corona - lua

Question

I am trying to complete this Lua tic-tac-toe tutorial in Corona SDK.
I managed to get through the 1st part but got lost during this 2nd part where he is establishing variables within a table to register the alternating turns for "x" and "o".
He is using the tap count to determine which turn it is and I did try to use Corona's touch.id to mimic this technique, to no avail.
I am hoping someone can explain how I can achieve this using Corona.
Here is what I have so far (from Part1 of Tutorial):
d = display
w20 = d.contentWidth * .2
h20 = d.contentHeight * .2
w40 = d.contentWidth * .4
h40 = d.contentHeight * .4
w60 = d.contentWidth * .6
h60 = d.contentHeight * .6
w80 = d.contentWidth * .8
h80 = d.contentHeight * .8
----DRAW LINES FOR BOARD
local lline = d.newLine(w40,h20,w40,h80 )
lline.strokeWidth = 5
local rline = d.newLine(w60,h20,w60,h80 )
rline.strokeWidth = 5
local bline = d.newLine(w20,h40,w80,h40 )
bline.strokeWidth = 5
local tline = d.newLine(w20,h60,w80,h60 )
tline.strokeWidth = 5
--PLACE BOARD COMPARTMENT DIMENSIONS IN TABLE
board ={
{"tl", 1, w20, h40, w40, h20,0},
{"tm",2, w40,h40,w60,h20,0},
{"tr",3, w60,h40,w80,h20,0},
{"ml", 4, w20, h60, w40, h40,0},
{"mm",5, w40,h60,w60,h40,0},
{"mr",6, w60,h60,w80,h40,0},
{"bl", 7, w20, h80, w40, h60,0},
{"bm",8, w40,h80,w60,h60,0},
{"br",9, w60,h80,w80,h60,0}
}
--
--FILL COMPARTMENT W/ COLOR WHEN TOUCHED
local function fill (event)
if event.phase == "began" then
tap = 0
for t = 1, 9 do
if event.x > board[t][3] and event.x < board [t][5] then
if event.y < board[t][4] and event.y > board[t][6] then
r = d.newRect(board[t][3],board [t][6],w20,h20)
r:setFillColor(1,1,0)
r.anchorX=0
r.anchorY=0
end
end
end
end
end
Runtime:addEventListener("touch", fill)

Answer 1

I use new variable whichTurn to figure out what to put on board in each turn. I think code is self-explanatory. Try
...
local EMPTY, X, O = 0, 1, 2
local whichTurn = X -- X is starting game
...
--FILL COMPARTMENT W/ COLOR WHEN TOUCHED
local function fill (event)
if event.phase == "began" then
for t = 1, 9 do
if event.x > board[t][3] and event.x < board [t][5] then
if event.y < board[t][4] and event.y > board[t][6] then
if board[t][7] == EMPTY then
board[t][7] = whichTurn
--[[
The operator AND returns its first argument if it is false;
otherwise, it returns its second argument. The operator OR
returns its first argument if it is not false; otherwise, it
returns its second argument.
--]]
whichTurn = whichTurn == X and O or X
end
end
end
end
end
end
Runtime:addEventListener("touch", fill)
You can read more about differences between tap and touch events in Corona.
Check also this from Corona documentation
Filtering Multiple Taps
Using the event.numTaps property, you can easily determine whether an
object was tapped multiple times and concurrently ignore single taps
on the object.