dvdlogomeme.lua

local image, x, y, fx, fy, offsetX, offsetY, width, height

--[[
  calculates the four edges of the image, and returns them as a table:
  {
    x1,
    y1,
    x2,
    y2
  }
]]
local function calculateEdges(image, x, y)
  local edges = {}
  local closeInOffset = 30
  edges[1] = x - offsetX + closeInOffset
  edges[2] = y - offsetY + closeInOffset
  edges[3] = x + offsetX - closeInOffset
  edges[4] = y + offsetY - closeInOffset
  return edges
end

--[[
  The default load function
]]
function love.load()
  image = love.graphics.newImage("images/DVD_LOGO.PNG")
  offsetX = image:getWidth() / 2
  offsetY = image:getHeight() / 2
  fx = true
  fy = true
  love.window.setMode(1091, 699)
  width, height = love.graphics.getDimensions()
  x = math.random(50, width - 49)
  y = math.random(50, height - 49)
end

function love.update(dt)
  local function inc(t, n)
    if t then
      return n + 1
    else
      return n - 1
    end
  end

  x = inc(fx, x)
  y = inc(fy, y)

  local edges = calculateEdges(image, x, y)

  if edges[1] < 1 then
    fx = true
  elseif edges[3] > width - 1 then
    fx = false
  end

  if edges[2] < 1 then
    fy = true
  elseif edges[4] > height - 1 then
    fy = false
  end

end

function love.draw()
  love.graphics.draw(image, x, y, 0, 1, 1, offsetX, offsetY)
end