anchor: Canvas:renderTo
  Render to the Canvas using a function.
  
  This is a shortcut to love.graphics.setCanvas:
  
  canvas:renderTo( func )
  
  is the same as
  
  love.graphics.setCanvas( canvas )
  
  func()
  
  love.graphics.setCanvas()
  Canvas:renderTo( func, ... )
  func function A function performing drawing operations.
  ... any Additional arguments to call the function with.