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
23 #include "../math/physic.h"
24 #include "../special/timer.h"
26 using namespace SuperTux;
29 : ax(0), ay(0), vx(0), vy(0), gravity_enabled(true)
40 ax = ay = vx = vy = 0;
41 gravity_enabled = true;
45 Physic::set_velocity_x(float nvx)
51 Physic::set_velocity_y(float nvy)
57 Physic::set_velocity(float nvx, float nvy)
63 void Physic::inverse_velocity_x()
68 void Physic::inverse_velocity_y()
74 Physic::get_velocity_x()
80 Physic::get_velocity_y()
86 Physic::set_acceleration_x(float nax)
92 Physic::set_acceleration_y(float nay)
98 Physic::set_acceleration(float nax, float nay)
105 Physic::get_acceleration_x()
111 Physic::get_acceleration_y()
117 Physic::enable_gravity(bool enable_gravity)
119 gravity_enabled = enable_gravity;
123 Physic::apply(float elapsed_time, float &x, float &y, float gravity)
127 grav = gravity / 100.0;
131 x += vx * elapsed_time + ax * elapsed_time * elapsed_time;
132 y += vy * elapsed_time + (ay + grav) * elapsed_time * elapsed_time;
133 vx += ax * elapsed_time;
134 vy += (ay + grav) * elapsed_time;
138 Physic::apply(Vector& vector, float elapsed_time, float gravity)
140 apply(elapsed_time, vector.x, vector.y, gravity);