-- File dropped on love2d

function love.load()
  font = love.graphics.newFont(12)

  filepath = ""
  loadreq = false

  img = nil
  scalev = 0
  angle = 0
end

function love.update(dt)
  if loadreq then
    -- load png image
    loadreq = false
    local f = io.open(filepath, "rb")
    local contents = f:read("*all")
    local data = love.filesystem.newFileData(contents, "temp.png")
    local imgdata = love.image.newImageData(data)
    f:close()
    img = love.graphics.newImage(imgdata)
  end

  scalev = 0.1 * math.sin(math.rad(angle))
  angle = (angle + 540 * dt) % 360.0
end

function love.draw()
  -- clear canvas
  love.graphics.clear(0.2, 0.2, 0.2, 1.0)

  -- draw image
  love.graphics.setColor(1.0, 1.0, 1.0, 1.0)
  if img ~= nil then
    local scrw, scrh = love.graphics.getDimensions()
    local w = img:getWidth()
    local h = img:getHeight()
    local x = scrw / 2
    local y = scrh - 16
    local ox = w / 2
    local oy = h
    local yscale = 1.0 + scalev
    local xscale = (w * h) / (h * yscale) / w
    love.graphics.draw(img, x, y, 0, xscale, yscale, ox, oy)
  end

  -- draw text
  love.graphics.setFont(font)
  love.graphics.setColor(1, 1, 1, 1)
  love.graphics.print("Please drop the png image file", 220, 2)
  love.graphics.print(filepath, 2, 40)
  love.graphics.print("FPS: " .. tostring(love.timer.getFPS()), 2, 2)
end

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

function love.filedropped(file)
  filepath = file:getFilename()
  loadreq = true
end