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
21 #ifndef SUPERTUX_PHYSIC_H
22 #define SUPERTUX_PHYSIC_H
24 #include "math/vector.h"
26 /** This is a very simplistic physics engine handling accelerated and constant
27 * movement along with gravity.
35 /** resets all velocities and accelerations to 0 */
38 /** sets velocity to a fixed value */
39 void set_velocity(float vx, float vy);
41 void set_velocity_x(float vx);
42 void set_velocity_y(float vy);
44 /** velocities invertion */
45 void inverse_velocity_x();
46 void inverse_velocity_y();
48 float get_velocity_x();
49 float get_velocity_y();
51 /** sets acceleration applied to the object. (Note that gravity is
52 * eventually added to the vertical acceleration)
54 void set_acceleration(float ax, float ay);
56 void set_acceleration_x(float ax);
57 void set_acceleration_y(float ay);
59 float get_acceleration_x();
60 float get_acceleration_y();
62 /** enables or disables handling of gravity */
63 void enable_gravity(bool gravity_enabled);
65 /** applies the physical simulation to given x and y coordinates */
66 void apply(float frame_ratio, float &x, float &y, float& gravity = 10);
68 /** applies the physical simulation to given x and y coordinates */
69 void apply(Vector& vector, float frame_ratio, float& gravity = 10);
72 /// horizontal and vertical acceleration
74 /// horizontal and vertical velocity
76 /// should we respect gravity in out calculations?
80 #endif /*SUPERTUX_PHYSIC_H*/