/* Projectile Flight Functions
   Header File
   Author: J. Dalbey
*/

#include <math.h>

#define kPi 3.1415926535 /* Constant Pi */
#define kGravity 32.17  /* Gravitational constant */

/* Convert degrees to radians.
   angle in radians = angle in degres * Pi / 180 */
double degrees_to_radians(double degrees); /* input - degrees */  

/* Calculate the time a projectile will be in flight until
   it reaches a given distance */
double calculate_time(double distance, /* input - distance to travel (ft) */
                      double velocity, /* input - initial velocity (ft/sec) */
                      double theta);   /* input - initial angle (radians) */
                      
/* Calculate the height a projectile will attain for a given time in flight */                      
double calculate_height(double velocity, /* input - initial velocity (ft/sec) */
                        double theta,    /* input - initial angle (radians) */
                        double time);    /* input - time in flight (secs) */
                        
/* Calculate the horizontal distance traveled for a given time in flight */
double calculate_distance(double velocity, /* input - initial velocity (ft/sec) */
                          double theta,  /* input - initial angle (radians) */
                          double time); /* input - time in flight (secs) */