Consolidated functions

display.setStatusBar(display.HiddenStatusBar)
local storyboard = require "storyboard"
local scene = storyboard.newScene()
require "sprite"

----------------------------
-- Functions
----------------------------

local function buttonTouch(event)
    local button = event.target
    local bounds = button.contentBounds
    if event.phase == "began" then
        button.currentFrame = 2
        display.getCurrentStage():setFocus(button, event.id)
        button.isFocused = true
    elseif button.isFocused then
        local isWithinBounds = bounds.xMin <= event.x and bounds.xMax >= event.x and bounds.yMin <= event.y and bounds.yMax >= event.y
        if event.phase == "moved" then
            if isWithinBounds then
                button.currentFrame = 2
            else
                button.currentFrame = 1
            end
        elseif event.phase == "ended" or event.phase == 'cancelled' then
            if event.phase == "ended" and isWithinBounds then
                if options.audio then
                    audio.play(audioChange)
                end
                button.currentFrame = 1
                storyboard.gotoScene(button.targetScene, "slideLeft", 500)
            end
            button.currentFrame = 1
            display.getCurrentStage():setFocus(button, nil)
            button.isFocused = false
        end
    end
end

----------------------------
-- Storyboard
----------------------------

function scene:createScene(event)
    local group = self.view
    if options.audio then
        audioBackground = audio.loadStream("audio/menu_background" .. storyboard.audioType)
            audio.play(audioBackground, {fadein = 1000, loops = -1})
        audioChange = audio.loadSound("audio/menu_change" .. storyboard.audioType)
    end
    local background = display.newImage(group, "visuals/menu_background.png", 0, 0)
    local buttonSheet = sprite.newSpriteSheet("visuals/menu_buttons.png", 405, 100)
    local button = {}
    button.Play = sprite.newSprite(sprite.newSpriteSet(buttonSheet, 1, 2))
        group:insert(button.Play)
        button.Play.targetScene = "maps.level1Scene"
        button.Play:addEventListener("touch", buttonTouch)
        button.Play:setReferencePoint(display.TopCenterReferencePoint)
        button.Play.x = display.contentWidth / 2
        button.Play.y = 340
    buttonOptions = sprite.newSprite(sprite.newSpriteSet(buttonSheet, 3, 2))
        group:insert(button.Options)
        button.Options.targetScene ="optionsScene"
        button.Options:addEventListener("touch", buttonTouch)
        button.Options:setReferencePoint(display.TopLeftReferencePoint)
        button.Options.x = 50
        button.Options.y = 490
    buttonCredits = sprite.newSprite(sprite.newSpriteSet(buttonSheet, 5, 2))
        group:insert(button.Credits)
        buttonCredits.targetScene = "creditsScene"
        buttonCredits:addEventListener("touch", buttonTouch)
        buttonCredits:setReferencePoint(display.TopLeftReferencePoint)
        buttonCredits.x = 505
        buttonCredits.y = 490
end

function scene:exitScene(event)
    if options.audio then
        audio.stop()
        audio.dispose(audioBackground)
        audio.dispose(audioChange)
    end
    storyboard.purgeScene("menuScene")
end

scene:addEventListener("createScene", scene)
scene:addEventListener("exitScene", scene)
return scene