anchor: love.graphics.push
  Copies and pushes the current coordinate transformation to the transformation stack.
  
  This function is always used to prepare for a corresponding pop operation later. It stores the current coordinate transformation state into the transformation stack and keeps it active. Later changes to the transformation can be undone by using the pop operation, which returns the coordinate transform to the state it was in before calling push.
  love.graphics.push()
  love.graphics.push( stack )
  stack StackType The type of stack to push (e.g. just transformation state, or all love.graphics state).