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"
30 /** This is a very simplistic physics engine handling accelerated and constant
31 * movement along with gravity.
39 /// Resets all velocities and accelerations to 0.
42 /// Sets velocity to a fixed value.
43 void set_velocity(float vx, float vy);
45 void set_velocity_x(float vx);
46 void set_velocity_y(float vy);
48 /// Velocities invertion.
49 void inverse_velocity_x();
50 void inverse_velocity_y();
52 float get_velocity_x();
53 float get_velocity_y();
56 /** Sets acceleration applied to the object. (Note that gravity is
57 * eventually added to the vertical acceleration)
59 void set_acceleration(float ax, float ay);
61 void set_acceleration_x(float ax);
62 void set_acceleration_y(float ay);
64 float get_acceleration_x();
65 float get_acceleration_y();
67 /// Enables or disables handling of gravity.
68 void enable_gravity(bool gravity_enabled);
70 /// Applies the physical simulation to given x and y coordinates.
71 void apply(float frame_ratio, float &x, float &y, float gravity = 10.0f);
73 /// applies the physical simulation to given x and y coordinates.
74 void apply(Vector& vector, float frame_ratio, float gravity = 10.0f);
77 /// horizontal and vertical acceleration
79 /// horizontal and vertical velocity
81 /// should we respect gravity in out calculations?
85 } //namespace SuperTux
87 #endif /*SUPERTUX_PHYSIC_H*/