Space invaders main file

Main.lua

hero = nil
enemies = nil
bgLines = nil
explosion = nil
killCount=0


GAME_PLAYING = 0
GAME_DEAD = 1
GAME_WON = 2
state = GAME_PLAYING
heroSize=100

-- Use this function to perform your initial setup
function setup()
    state = GAME_PLAYING

    iparameter("BackgroundSpawnRate",0,3,2)

    hero = Invader()
    hero.position = vec2(WIDTH/2, 150)

    enemies = EnemyHorde()
    enemies.heroBullets = hero.bullets

    bgLines = StreamingLines()
end

function touchingAtPos()
    if CurrentTouch.state == BEGAN or 
       CurrentTouch.state == MOVING then
        return vec2( CurrentTouch.x, CurrentTouch.y )
    end 

    return nil
end

function showScore()
    watch("killCount")
end
-- This function gets called once every frame
function draw()

    background(0, 0, 0, 255)

    bgLines.spawnRate = BackgroundSpawnRate

    bgLines:update()
    bgLines:draw()
    showScore()
    
    if state == GAME_PLAYING then 
        -- Process touch
        touch = touchingAtPos()
        if touch then
            if touch.x < (hero.position.x - 10) then
                hero.position.x = hero.position.x - 3
            elseif touch.x > (hero.position.x + 10) then
                hero.position.x = hero.position.x + 3
            end
        end

        if killCount == 20 then
            enemies.spawnPattern = ENEMY_SPAWN_HARD
        end

        enemies:draw()

        hero:draw()

        -- Check if hero is hit
        for i,v in ipairs(enemies.units) do
            if v:dist(hero.position) < heroSize then
                state = GAME_DEAD
                explosion = Explosion(hero.position)
            end
        end
    elseif state == GAME_DEAD then
        if explosion then
            explosion:draw()
            if explosion:isDone() then
                explosion = nil
            end
        end
    end
end