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# -*- coding: utf-8 -*-
# Copyright (c) 2007-2012 by Enrique Pérez Arnaud <enriquepablo@gmail.com>
#
# This file is part of nlproject.
#
# The nlproject 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.
#
# The nlproject 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 any part of the nlproject.
# If not, see <http://www.gnu.org/licenses/>.
body are thing.
a body can has_mass kg a number.
a body can has_position x a number, y a number.
a body can has_speed x a number, y a number.
a body can has_acceleration x a number, y a number.
a body can is_forced x a number, y a number.
if:
Body1 [has_position x N1, y N2] at I1;
Body1 [has_speed x N3, y N4] at I1;
{I1 < 33};
then:
Body1 [has_position x {N1 + N3}, y {N2 + N4}] at {I1 + 1}.
if:
Body1 [has_speed x N1, y N2] at I1;
Body1 [has_acceleration x N3, y N4] at I1;
{I1 < 33};
then:
Body1 [has_speed x {N1 + N3}, y {N2 + N4}] at {I1 + 1}.
if:
Body1 [has_mass kg N1] D1;
Body1 [is_forced x N2, y N3] at I1;
{I1 < 33};
I1 during D1;
then:
Body1 [has_acceleration x {N2 / N1}, y {N3 / N1}] at I1.
if:
Body1 [has_position x N1, y N2] at I1;
Body1 [has_mass kg N3] D1;
Body2 [has_position x N4, y N5] at I1;
Body2 [has_mass kg N6] D2;
distinct Body1, Body2;
{I1 < 33};
I1 during D1;
I1 during D2;
then:
Body1 [is_forced x {0 - ((N3 * N6) / (N1 - N4))}, y {0 - ((N3 * N6) / (N2 - N5))}] at I1.
body1 isa body.
body1 [has_mass kg 2] since 1 onwards.
body1 [has_position x 2, y 2] at 1.
body1 [has_speed x 2, y 2] at 1.
body2 isa body.
body2 [has_mass kg 2] since 1 onwards.
body2 [has_position x -2, y -2] at 1.
body2 [has_speed x 2, y -2] at 1.
extend.
body1 [has_position x N1, y N2] at 32?
body1 \[has_position y -?[0-9\.]+, x -?[0-9\.]+\] at 32.
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