-- sprite move example 02

function love.load()
  -- init
  
  -- get window width and height
  scrw = love.graphics.getWidth()
  scrh = love.graphics.getHeight()
  
  -- load image
  bgimg = love.graphics.newImage("bg_640x480.png")
  playerimg = love.graphics.newImage("spaceship_001_64x64.png")
  
  -- player work
  player = {}
  player.x = scrw / 2
  player.y = scrh / 2
  player.speed = 250
  player.imgw = playerimg:getWidth()
  player.imgh = playerimg:getHeight()
end

function love.update(dt)
  -- update
  
  -- key check
  local ang = -1
  if love.keyboard.isDown("left") then ang = 180
  elseif love.keyboard.isDown("right") then ang = 0
  end
  if love.keyboard.isDown("up") then
    if ang < 0 then ang = 270
    elseif ang == 0 then ang = 270 + 45
    else ang = 180 + 45
    end
  elseif love.keyboard.isDown("down") then
    if ang < 0 then ang = 90
    elseif ang == 0 then ang = 45
    else ang = 180 - 45
    end
  end
  if ang >= 0 then
    local spd = player.speed * dt
    local ra = math.rad(ang)
    player.x = player.x + (spd * math.cos(ra))
    player.y = player.y + (spd * math.sin(ra))
  end

  -- move area check
  local wh = player.imgw / 2
  local hh = player.imgh / 2
  local xmin = wh
  local ymin = hh
  local xmax = scrw - wh
  local ymax = scrh - hh
  player.x = math.min(math.max(player.x, xmin), xmax)
  player.y = math.min(math.max(player.y, ymin), ymax)
end

function love.draw()
  -- draw BG
  love.graphics.setColor(255, 255, 255, 255)
  love.graphics.draw(bgimg, 0, 0)
  -- love.graphics.rectangle("fill", 0, 465, scrw, 150)
  love.graphics.setColor(255, 255, 255, 255)
  
  -- draw player
  ofsx = player.imgw / 2
  ofsy = player.imgh / 2
  love.graphics.draw(playerimg, player.x - ofsx, player.y - ofsy)
  
  love.graphics.print("FPS: "..tostring(love.timer.getFPS()), 10, 10)
end

function love.keypressed(key, isrepeat)
  -- ESC to exit
  if key == "escape" then
    love.event.quit()
  end
end