There are three locations in the code that repeat a pattern of
"If z=0 then use 2d-approx(dx,dy), else if x==0 && y==0 then use dz,
else use 3d-approx".
Teach approx_distance_3 to detect these conditions for us and apply
the same logic. Replace the three call locations with a simple call
to approx_distance_3.
Binary size for the LOOKAHEAD case drops by almost 400 bytes:
old: FLASH : 21242 bytes 149% 70% 34% 17%
new: FLASH : 20844 bytes 146% 68% 33% 17%
The size for non-LOOKAHEAD drops by 40 bytes:
old: FLASH : 16592 bytes 116% 55% 27% 13%
new: FLASH : 16552 bytes 116% 54% 27% 13%
We can actually do a little better if we consider the zero-ness of all
three axes, but this does make the code a little bit bigger. Another
change will consider that option. This change simply tries to mimic
the existing functionality.
##############################################################################
# #
# Teacup - lean and efficient firmware for RepRap printers #
# #
# by Triffid Hunter, Traumflug, jakepoz, Markus Hitter, many others #
# #
##############################################################################
For installation instructions, see
http://reprap.org/wiki/Teacup_Firmware#Simple_Installation and/or
http://reprap.org/wiki/Teacup_Firmware#Developer_Installation
For documentation, see
http://reprap.org/wiki/Teacup_Firmware
##############################################################################
# #
# This firmware is Copyright (c) ... #
# 2009 - 2010 Michael Moon aka Triffid_Hunter #
# 2010 - 2013 Markus "Traumflug" Hitter <mah@jump-ing.de> #
# #
# This program is free software; you can redistribute it and/or modify #
# it under the terms of the GNU General Public License as published by #
# the Free Software Foundation; either version 2 of the License, or #
# (at your option) any later version. #
# #
# This program is distributed in the hope that it will be useful, #
# but WITHOUT ANY WARRANTY; without even the implied warranty of #
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the #
# GNU General Public License for more details. #
# #
# You should have received a copy of the GNU General Public License #
# along with this program; if not, write to the Free Software #
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA #
# #
##############################################################################
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