LÖVE

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function love.load(arg)
  
  scaleAmount = love.graphics.getHeight()/480
  
  base = {}
  base.scale = 2
  
  hero = {}
  hero.sprite = love.graphics.newImage("assets/heroSprite.png")
  hero.sprite:setFilter("linear", "nearest")
  hero.width = 16
  hero.height = 16
  hero.spriteGrid = anim8.newGrid(hero.width, hero.height, hero.sprite:getWidth(), hero.sprite:getHeight())
  hero.spriteAnimation = {
    walk = anim8.newAnimation(hero.spriteGrid('2-5', 1), 0.1),
    stand = anim8.newAnimation(hero.spriteGrid('1-1', 1), 0.1)
  }
  hero.x = 100
  hero.y = 100
  hero.vx = 0
  hero.vy = 0
  hero.speed = 175
  hero.scale = base.scale
  
  hero.onGround = false
  
  tile = {}
  tile[0] = love.graphics.newImage("assets/clear.png")
  tile[1] = love.graphics.newImage("assets/placeholder16x16.png")
  tile[1]:setFilter("linear", "nearest")
  tile.width = 16 * base.scale
  tile.height = 16 * base.scale
  
  map = {
    { 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1},
    { 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1},
    { 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1},
    { 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1},
    { 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1},
    { 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1},
    { 1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1},
    { 1, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1},
    { 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1},
    { 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1},
    { 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1},
    { 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1},
    { 1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1},
    { 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1},
    { 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1}
  }
  map.height = 15
  map.width = 25
  map.x = 0
  map.y = 0
  map.offsetX = 0
  map.offsetY = 0
--map.displayHeight = 30
--map.displayWidth = 30

end

function love.draw()
  love.graphics.push()
  love.graphics.scale(scaleAmount,scaleAmount)
  
  love.graphics.print("x: " .. hero.x
                       .. "\ny: " .. hero.y
                       .. "\nvx: " .. hero.vx
                       .. "\nvy: " .. hero.vy
                       .. "\nonGround: " .. tostring(hero.onGround)
                       .. "\nfps: " .. love.timer.getFPS(),
                       64, 32)
  
  love.graphics.setBackgroundColor(0,0,0)
  drawMap()
  hero.spriteState:draw(hero.sprite, hero.x, hero.y, 0, hero.scale, base.scale, hero.width/2)

  love.graphics.pop()
end

function drawMap()
  for y = 1, map.height do
    for x = 1, map.width do
      love.graphics.draw(
        tile[map[y + map.y][x + map.x]],
        ((x - 1) * tile.width) + map.offsetX,
        ((y - 1) * tile.height) + map.offsetY,
         0, base.scale)
    end
  end
end

function love.update(dt)
  
  hero.spriteState = hero.spriteAnimation.stand

  if not love.keyboard.isDown("left") and not love.keyboard.isDown("right") then
    if (hero.state == "walkLeft" and hero.vx > -5) or (hero.state == "walkRight" and hero.vx < 5) then
      hero.vx = 0
    end
    if hero.vx < 0 then
      hero.vx = hero.vx + 1000*dt
    end
    if hero.vx > 0 then
      hero.vx = hero.vx - 1000*dt
    end
  end

  if hero.vx < 0 then
    leftPixelX = hero.x - 2
    leftPixelY = hero.y
    for y = leftPixelY + 5, leftPixelY + tile.height - 2 do 
      mapX = math.ceil(leftPixelX / tile.width)
      mapY = math.ceil(y / tile.height)
      leftTile = map[mapY][mapX]
      if leftTile == 1 then
        hero.vx = 0
      end
    end
  end
  
  if hero.vx > 0 then
    rightPixelX = hero.x + tile.width + 2
    rightPixelY = hero.y
    for y = rightPixelY + 5, rightPixelY + tile.height - 2 do
      mapX = math.floor(rightPixelX / tile.width)
      mapY = math.ceil(y / tile.height)
      rightTile = map[mapY][mapX]
      if rightTile == 1 then
        hero.vx = 0
      end
    end
  end
  
  hero.x = hero.x + hero.vx*dt
  
  if hero.vy < 0 then
    topPixelX = hero.x
    topPixelY = hero.y + 4
    for x = topPixelX -1, topPixelX + 1 do
      zmapX = math.ceil(x / tile.width)
      mapY = math.ceil(topPixelY / tile.height)
      topTile = map[mapY][zmapX]
      if topTile == 1 then
        hero.vy = 0
      end
    end
  end
  
  bottomPixelX = hero.x
  bottomPixelY = hero.y + tile.height + 1
  touchGround = false
  for x = bottomPixelX - 1, bottomPixelX + 1 do
    bmapX = math.ceil(x / tile.width)
    mapY = math.ceil(bottomPixelY / tile.height)
    bottomTile = map[mapY][bmapX]
    if bottomTile == 1 then
      touchGround = true
    end
  end
  if touchGround then
    hero.onGround = true
    hero.vy = 0
    hero.y = (mapY - 2) * 32
  else
    hero.onGround = false
    hero.vy = hero.vy + (1000 * dt)
  end
  
  hero.y = hero.y + (hero.vy * dt)

  if love.keyboard.isDown("left") then
    hero.state = "walkLeft"
    hero.spriteState = hero.spriteAnimation.walk
    hero.scale = -base.scale
    if hero.vx < -hero.speed then
        hero.vx = -hero.speed
    else
        hero.vx = hero.vx - 800*dt
    end
  elseif love.keyboard.isDown("right") then
    hero.state = "walkRight"
    hero.spriteState = hero.spriteAnimation.walk
    hero.scale = base.scale
    if hero.vx > hero.speed then
        hero.vx = hero.speed
    else
        hero.vx = hero.vx + 800*dt
    end
  end

  if love.keyboard.isDown("up") then
    if hero.onGround then
        hero.y = hero.y - 1
        hero.vy = hero.vy - 400
        hero.onGround = false
    end
  end
  
  hero.spriteState:update(dt)
  
end