CoronaSDK

function intersection(p11,p12,p21,p22)
        local Z  = (p12.y-p11.y)*(p21.x-p22.x)-(p21.y-p22.y)*(p12.x-p11.x);
        local Ca = (p12.y-p11.y)*(p21.x-p11.x)-(p21.y-p11.y)*(p12.x-p11.x);
        local Cb = (p21.y-p11.y)*(p21.x-p22.x)-(p21.y-p22.y)*(p21.x-p11.x);

        if Z == 0 and Ca == 0 and Cb == 0 then return nil end


        if Z == 0 then return nil end

CoronaSDK

-- show rating prompt
local function ratingPrompt()
	local function ask()
		local function answer(event)
			if ("clicked" == event.action) then
				if (event.index == 1) then
					system.openURL("http://ax.itunes.apple.com/WebObjects/MZStore.woa/wa/viewContentsUserReviews?type=Purple+Software&id=440754678")
					data.rated = "yes"
					writeData()
				elseif (event.index == 2) then

CoronaSDK

-- iap results
function iapTransaction(event)
	if (event.transaction.state == "purchased") or (event.transaction.state == "restored") then
		if (event.transaction.productIdentifier == "playmaticBalloons") then
			data.iap.iapBalloons = "yes"
			iconBalloonsPrice.alpha = 0		
		end
		writeData()
	elseif (event.transaction.state == "cancelled") then
	elseif (event.transaction.state == "failed") then        

CoronaSDK

local targetDevice = ( system.getInfo( "model" ) ) 
local isTall = ( "iPhone" == system.getInfo( "model" ) ) and ( display.pixelHeight > 960 )

if isTall == false and targetDevice == "iPhone" then
application = 
{
	content = 
	{
		width = 320,
		height = 480,