Thread: Angle of Trajectory?

Although that post is really not about the same thing. There is another post here about bullets that covers it better.

Essentially:

Code:

#define PI 3.14159
#define DEGTORAD(angle) ((double)angle*PI/180.0)

struct point2D
{
  double x;
  double y;
};

struct Bullet
{
   point2D Pos;
   point2D Vel;
   double speed;
   int active;
};

void FireBullet(point2D Start,int angle,double speed,Bullet *newbullet)
{
  newbullet->x=Start.x;
  newbullet->y=Start.y;
  newbullet->vel.x=cos(DEGTORAD(angle));
  newbullet->vel.y=sin(DEGTORAD(angle));
  newbullet->speed=speed;
  newbullet->active=TRUE;
}

//Assuming we have an array of Bullet objects called Bullets
void UpdateBullets
{
  for (int i=0;i<NumBullets;i++)
  {
     if (Bullets[i].active)
     {
        Bullets[i].x+=(Bullets[i].vel.x*Bullets[i].speed);
        Bullets[i].y+=(Bullets[i].vel.y*Bullets[i].speed);
     }
   }
}

This is only for 2D, for 3D you must do a little more.