/* particle.h - Header for particle.c - Don Yang (uguu.org)

   08/31/98: Factor
   09/11/98: Rotate
                                                                           */

/* Constants */
#define TITLE           "Particle 1.22 (9/19/98) - by Don Yang"

#define USE_DELAY_DOTS           /* Undefine to disable motion blur */
#define ALLOW_FLOAT_MORPH        /* Undefine to use integer morph */

#define TICKS_PER_FRAME 27600    /* 8253 ticks per frame */

#define MAX_PARTICLES   20000    /* Particle limits */
#define MIN_PARTICLES   20

#define SINE_SCALE      512      /* Sine table scale */
#define PI              3.1415926535897932384626433

#define PHASE_TIME      600      /* Phase shifter parameters */
#define MORPH_TIME      60
#define TIME_ERR        60
#define SYSTEM_COUNT    6
#define M_STAR          1
#define M_SQUARE        2
#define M_SPHERE        3
#define M_WAVE          4
#define M_FIREWORK      5
#define M_BUTTERFLY     6

#define SPACE_W         500      /* Logical space limits */
#define SPACE_H         500
#define SPACE_L         500

#define DISTANCE_X      150      /* Projection parameters */
#define DISTANCE_Y      125
#define OFFSET_X        160
#define OFFSET_Y        100
#define OFFSET_Z        (5 * SPACE_L / 3)

/* Macros */
#define Generate(x, r)     ( (x) % ((r) * 2 - 1) - r + 1 )

#define WrapMin(x, r)      ( ((x) <= -(r)) ? ((x) + (r) * 2 - 1) : (x) )
#define WrapMax(x, r)      ( ((x) >= (r)) ? ((x) - (r) * 2 + 1) : (x) )

#ifdef ALLOW_FLOAT_MORPH
   #define Morph(s, t, f, p)  ((int)( (double)(s) + ((f) * ((double)(t) - (s)) / (p)) ))
#else
   #define Morph(s, t, f, p)  ((int)( (long)(s) + ((f) * ((long)(t) - (s)) / (p)) ))
#endif

#define ProjectX(x, z)  (DISTANCE_X * (long)(x) / (z + OFFSET_Z) + OFFSET_X)
#define ProjectY(y, z)  (DISTANCE_Y * (long)(y) / (z + OFFSET_Z) + OFFSET_Y)
#define GetColor(z)     ((15 * (z+SPACE_L-1) / (SPACE_L * 2 - 2)) * 16 + 15)

#define Sine(a)         ((long)SineTable[a])
#define Cosine(a)       ((long)SineTable[((a) + 90) % 360])

/* Exports */
extern int _far SineTable[360];
extern int _far *ParticleX;
extern int _far *ParticleY;
extern int _far *ParticleZ;
extern int NumberOfParticles;

/* Functions */
void Factor(int n, int *row, int *column, int *extra);
void Rotate(int _far *sx, int _far *sy, int _far *tx, int _far *ty,
            int count, int angle);