lua language

[analytical]

Hi!

I am trying to create a function with a single argument. Then this function has to pick random square from the grid to start building the ship. There is no error, I don't know what's wrong. function addship can't build any ship...

gridWidth = 9
gridHeight = 14

grid = {}

for i=1, gridWidth, 1 do
grid[i] = {}
end


function tappedRect(event)
if event.target.ship then
event.target.ship = true
event.target:setFillColor(255, 0, 0)

else
event.target.ship = false
event.target:setFillColor(0,255, 0)

end
end






squareWidth = 25
squareHeight = 25
gap = 5


for i =1, gridWidth, 1 do
for j =1, gridHeight, 1 do

grid[i][j] = display.newRect((gap* i) + (i*squareWidth) , (gap* j) + (j* squareHeight), squareWidth, squareHeight)

end
end





for i =1, gridWidth, 1 do
for j =1, gridHeight, 1 do
grid[i][j].ship = false

grid[i][j]:addEventListener("tap", tappedRect)


end
end



function addShip(shipSize)
x = math.random(1, gridWidth)
y = math.random(1, gridHeight)

for i = 1, shipSize-1, 1 do
if grid[x-1][y].ship then
grid[x-i][y]:setFillColor(255,0,0)


end
end
end



addShip(2)





Please Help!