#ifndef __BOID_H__
#define __BOID_H__

#include <X11/Xlib.h>

#include "vec.h"

typedef struct {
   Vec pos, vel;
   int X,Y;
   int tail_lX, tail_lY, tail_rX, tail_rY, tail_X, tail_Y;
   XPoint shadow[4];
   int wing_level;
   int onscreen; /* boolean */
   int upstroke; /* boolean */
   int perching; /* boolean */
   int perch_timer;
} _Boid, *Boid;

int main(int argc, char **argv);

void boid_perspective(Boid boid, int W, int H);
int boid_isonscreen(Boid boid, int W, int H);
void boid_move(Boid boid, Boid allboids[], int numboids,
	       Vec real_center, Vec real_avgvel,
	       int W, int H);
Vec boid_perceive_center(Boid boid, Vec real_cent, int numboids);
Vec boid_av_vel(Boid boid, Vec real_avgvel, int numboids);
Vec boid_chill_out(Boid boid, Boid boids[], int numboids);
void draw_boid(Boid boid, Pixmap freshmap);
Boid new_boid(int W, int H);
void OpenWindow(void);
void SetupColormap(void);
void SetupDisplay(void);
void vec_add(Vec vec1, Vec vec2);
void vec_clear(Vec vec);
Vec vec_copy(Vec v1);
void vec_diff(Vec vec1, Vec vec2, Vec vec3);
void vec_limit(Vec vec, double lim);
void vec_lshift(Vec vec, int n);
double vec_rdist(Vec vec1, Vec vec2);
void vec_sdiv(Vec vec, double scalar);
void vec_setmag(Vec vec, double mag);
void vec_smul(Vec vec, double scalar);
Vec zero_vec(void);
#endif  /*  __BOID_H__  */