line_energy.py 1.62 KB
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# NIFTy
# Copyright (C) 2017  Theo Steininger
#
# Author: Theo Steininger
#
# 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 3 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, see <http://www.gnu.org/licenses/>.
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from .energy import Energy


class LineEnergy(Energy):
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    def __init__(self, position, energy, line_direction, zero_point=None):
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        super(LineEnergy, self).__init__(position=position)
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        self.line_direction = line_direction

        if zero_point is None:
            zero_point = energy.position
        self._zero_point = zero_point

        position_on_line = self._zero_point + self.position*line_direction
        self.energy = energy.at(position=position_on_line)
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    def at(self, position):
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        return self.__class__(position,
                              self.energy,
                              self.line_direction,
                              zero_point=self._zero_point)
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    @property
    def value(self):
        return self.energy.value

    @property
    def gradient(self):
        return self.energy.gradient.dot(self.line_direction)

    @property
    def curvature(self):
        return self.energy.curvature