A cursor box, for use in UtilitySprites.
struct
SpritefalsebooleantrueWhether this is a complete box or just the top left corner. If this is true, side_length and side_height must be present. Otherwise max_side_length must be present.
doubletrueOnly loaded, and mandatory if is_whole_box is true.
doubletrueOnly loaded, and mandatory if is_whole_box is true.
doubletrueOnly loaded, and mandatory if is_whole_box is false.