-- Mouse wheel callback on love2d

function love.load()
  love.graphics.setDefaultFilter("nearest", "nearest")
  font = love.graphics.newFont(16)
  wx, wy = 0, 0
end

function love.update(dt)
end

function love.draw()
  love.graphics.clear(0.2, 0.4, 0.6, 1.0)

  love.graphics.setFont(font)
  love.graphics.setColor(1, 1, 1, 1)

  local t
  local ty = 24

  t = string.format("Wheel x : %d", wx)
  love.graphics.print(t, 2, ty)
  ty = ty + 24

  t = string.format("Wheel y : %d", wy)
  love.graphics.print(t, 2, ty)
  ty = ty + 24

  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.wheelmoved(x, y)
  wx = wx + x
  wy = wy + y
end