#!/usr/bin/env python
##############################################################################
#
# diffpy.morph by DANSE Diffraction group
# Simon J. L. Billinge
# (c) 2010 Trustees of the Columbia University
# in the City of New York. All rights reserved.
#
# File coded by: Chris Farrow
#
# See AUTHORS.txt for a list of people who contributed.
# See LICENSE.txt for license information.
#
##############################################################################
"""Class MorphStretch -- stretch the morph."""
import numpy
from diffpy.morph.morphs.morph import LABEL_GR, LABEL_RA, Morph
[docs]
class MorphStretch(Morph):
"""Smear the morph function.
This stretches (broadens) the morph.
Configuration Variables
-----------------------
stretch
The stretch factor to apply to y_morph_in.
This is applied such that a feature at r is moved to r * (1 + stretch).
"""
# Define input output types
summary = "Stretch morph by desired amount"
xinlabel = LABEL_RA
yinlabel = LABEL_GR
xoutlabel = LABEL_RA
youtlabel = LABEL_GR
parnames = ["stretch"]
[docs]
def morph(self, x_morph, y_morph, x_target, y_target):
"""Resample arrays onto specified grid."""
Morph.morph(self, x_morph, y_morph, x_target, y_target)
if self.stretch == 0:
return self.xyallout
r = self.x_morph_in / (1.0 + self.stretch)
self.y_morph_out = numpy.interp(r, self.x_morph_in, self.y_morph_in)
self.set_extrapolation_info(self.x_morph_in, r)
return self.xyallout
# End of class MorphSmear