4 // Copyright (C) 2004 Tobias Glaesser <tobi.web@gmx.de>
6 // This program is free software; you can redistribute it and/or
7 // modify it under the terms of the GNU General Public License
8 // as published by the Free Software Foundation; either version 2
9 // of the License, or (at your option) any later version.
11 // This program is distributed in the hope that it will be useful,
12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 // GNU General Public License for more details.
16 // You should have received a copy of the GNU General Public License
17 // along with this program; if not, write to the Free Software
18 // Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
25 #include "../math/physic.h"
26 #include "../special/timer.h"
28 using namespace SuperTux;
31 : ax(0), ay(0), vx(0), vy(0), gravity_enabled(true)
42 ax = ay = vx = vy = 0;
43 gravity_enabled = true;
47 Physic::set_velocity_x(float nvx)
53 Physic::set_velocity_y(float nvy)
59 Physic::set_velocity(float nvx, float nvy)
65 void Physic::inverse_velocity_x()
70 void Physic::inverse_velocity_y()
76 Physic::get_velocity_x()
82 Physic::get_velocity_y()
88 Physic::set_acceleration_x(float nax)
94 Physic::set_acceleration_y(float nay)
100 Physic::set_acceleration(float nax, float nay)
107 Physic::get_acceleration_x()
113 Physic::get_acceleration_y()
119 Physic::enable_gravity(bool enable_gravity)
121 gravity_enabled = enable_gravity;
125 Physic::get_movement(float elapsed_time)
127 float grav = gravity_enabled ? 1000 : 0;
130 vx * elapsed_time + ax * elapsed_time * elapsed_time,
131 vy * elapsed_time + (ay + grav) * elapsed_time * elapsed_time
133 vx += ax * elapsed_time;
134 vy += (ay + grav) * elapsed_time;