physics.h

/*
 * See Licensing and Copyright notice in naev.h
 */
#pragma once
 
#include "vec2.h"
 
/*
 * Update options.
 */
#define SOLID_UPDATE_RK4      0 
#define SOLID_UPDATE_EULER    1 
extern const char _UNIT_TIME[];
extern const char _UNIT_PER_TIME[];
extern const char _UNIT_DISTANCE[];
extern const char _UNIT_SPEED[];
extern const char _UNIT_ACCEL[];
extern const char _UNIT_ENERGY[];
extern const char _UNIT_POWER[];
extern const char _UNIT_ANGLE[];
extern const char _UNIT_ROTATION[];
extern const char _UNIT_MASS[];
extern const char _UNIT_CPU[];
extern const char _UNIT_UNIT[];
extern const char _UNIT_PERCENT[];
#define UNIT_TIME       _(_UNIT_TIME)
#define UNIT_PER_TIME   _(_UNIT_PER_TIME)
#define UNIT_DISTANCE   _(_UNIT_DISTANCE)
#define UNIT_SPEED      _(_UNIT_SPEED)
#define UNIT_ACCEL      _(_UNIT_ACCEL)
#define UNIT_ENERGY     _(_UNIT_ENERGY)
#define UNIT_POWER      _(_UNIT_POWER)
#define UNIT_ANGLE      _(_UNIT_ANGLE)
#define UNIT_ROTATION   _(_UNIT_ROTATION)
#define UNIT_MASS       _(_UNIT_MASS)
#define UNIT_CPU        _(_UNIT_CPU)
#define UNIT_UNIT       _(_UNIT_UNIT)
#define UNIT_PERCENT    _(_UNIT_PERCENT)
 
typedef struct Solid_ {
   double mass; 
   double dir; 
   double dir_vel; 
   vec2 vel; 
   vec2 pos; 
   vec2 pre; 
   double accel; 
   double speed_max; 
   void (*update)( struct Solid_*, double ); 
} Solid;
 
/*
 * solid manipulation
 */
double solid_maxspeed( const Solid *s, double speed, double accel );
void solid_init( Solid* dest, double mass, double dir,
      const vec2* pos, const vec2* vel, int update );
 
/*
 * misc
 */
double angle_diff( double ref, double a );