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//Copyright Paul Reiche, Fred Ford. 1992-2002
/*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#ifndef UQM_VELOCITY_H_
#define UQM_VELOCITY_H_
#include <string.h> /* for memset */
#include "libs/gfxlib.h"
#if defined(__cplusplus)
extern "C" {
#endif
typedef struct velocity_desc
{
COUNT TravelAngle;
EXTENT vector;
EXTENT fract;
EXTENT error;
EXTENT incr;
} VELOCITY_DESC;
#define ZeroVelocityComponents(pv) memset(pv,0,sizeof (*(pv)))
#define GetVelocityTravelAngle(pv) (pv)->TravelAngle
extern void GetCurrentVelocityComponents (VELOCITY_DESC *velocityptr,
SIZE *pdx, SIZE *pdy);
extern void GetNextVelocityComponents (VELOCITY_DESC *velocityptr,
SIZE *pdx, SIZE *pdy, COUNT num_frames);
extern void SetVelocityVector (VELOCITY_DESC *velocityptr, SIZE magnitude,
COUNT facing);
extern void SetVelocityComponents (VELOCITY_DESC *velocityptr, SIZE dx,
SIZE dy);
extern void DeltaVelocityComponents (VELOCITY_DESC *velocityptr, SIZE dx,
SIZE dy);
static inline bool
IsVelocityZero (VELOCITY_DESC *vptr)
{
return vptr->vector.width == 0 && vptr->vector.height == 0 &&
vptr->incr.width == 0 && vptr->incr.height == 0 &&
vptr->fract.width == 0 && vptr->fract.height == 0;
}
static inline DWORD
VelocitySquared (SIZE dx, SIZE dy)
{
return (DWORD)((long)dx * dx + (long)dy * dy);
}
#define VELOCITY_SHIFT 5
#define VELOCITY_SCALE (1<<VELOCITY_SHIFT)
#define VELOCITY_TO_WORLD(v) ((v)>>VELOCITY_SHIFT)
#define WORLD_TO_VELOCITY(l) ((l)<<VELOCITY_SHIFT)
#if defined(__cplusplus)
}
#endif
#endif /* UQM_VELOCITY_H_ */
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