camera.lua

function makeCamera(world, xPixel, yPixel)

  -- Idea: Camera is just an invisible body, who's
  -- position in the world determines the transformation matrix
  -- and who's position is constrained by the map

  return love.physics.newBody(world, xPixel, yPixel, "dynamic")

end

function moveCamera(camera, dt)
  if player then
    local uiSize = screen.height/5
    local halfWidth = screen.width/2
    local halfHeight = (screen.height + uiSize)/2
    local halfTile = screen.tileSize/2

    local tx = math.max(player.body:getX(), halfWidth - halfTile)
    tx = math.min(tx, level.pixelWidth - halfWidth + screen.tileSize)
    local dx = tx - camera:getX() - halfWidth

    --local ty = math.max(player.body:getY(), halfHeight - halfTile)
    local ty = math.max(player.body:getY() + uiSize, halfHeight - halfTile) -- hard to say if 2*half is better, or half
    ty = math.min(ty, level.pixelHeight + screen.tileSize - uiSize)
    local dy = ty - camera:getY() - halfHeight

    local dist2 = dx*dx + dy*dy

    if player.invulnTime and player.invulnTime > 0 then
      local ddx, ddy = getRandomVector(100)
      dx = dx + ddx
      dy = dy + ddy
    end

    if dist2 > 0.001 then
      camera:setLinearVelocity(dx * dist2 * dt / 16, dy * dist2 * dt / 16)
    else
      camera:setLinearVelocity(0, 0)
    end
  end
end

function getRandomVector(magnitude)

  local angle = 2 * math.pi * math.random()
  return magnitude * math.cos(angle), magnitude * math.sin(angle)

end