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#
# Curve interpolation
# Copyright (c) 2020 Michael Büsch <m@bues.ch>
#
# 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 Street, Fifth Floor, Boston, MA 02110-1301 USA.
#
__all__ = [
"Curve",
"intp_lin",
"intp_log",
]
import micropython
from util import intp_lin, intp_log
class Curve(object):
def __init__(self, *points):
if not points:
# 1:1 curve.
points = ((1.0, 1.0),)
self.__pts = points
# Curve interpolation.
@micropython.native
def intp(self,
x,
oobHandler=lambda x, y: y,
intp=intp_lin):
# Check bounds.
pts = self.__pts
if pts[0][0] > x: # out of bounds
return oobHandler(x, pts[0][1])
if pts[-1][0] < x: # out of bounds
return oobHandler(x, pts[-1][1])
# Find the curve sampling points (left hand point; right hand point).
lhp = pts[0]
for rhp in pts:
if rhp[0] >= x:
break
lhp = rhp
# Interpolate between lhp and rhp.
return intp(x, lhp[0], lhp[1], rhp[0], rhp[1])
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