static int get_discrete_uv( Context ctx, int time, int r, int c, int l,
float *uptr, float *vptr, float *wptr )
{
float u = get_grid_value( ctx, time, ctx->dpy_ctx->TrajU, r, c, l );
float v = get_grid_value( ctx, time, ctx->dpy_ctx->TrajV, r, c, l );
if (IS_MISSING(u) || IS_MISSING(v)) {
/* missing */
return 0;
}
else {
/* return u,v,w in boxes/sec */
*uptr = u * ctx->Uscale[r][c];
*vptr = v * ctx->Vscale[r][c];
*wptr = 0;
return 1;
}
}
ShotResult TakeShot(Ocean &ocean, const Point &coordinate)
{
// Check edges.
if (coordinate.x < 0 || coordinate.x > ocean.x_quadrants
|| coordinate.y < 0 || coordinate.y > ocean.y_quadrants)
{
return(srILLEGAL);
}
// Get the value for easy access.
int gridvalue = *get_grid_value(ocean, coordinate.x, coordinate.y);
// Miss test.
if (gridvalue == 0)
{
ocean.stats.misses++;
*get_grid_value(ocean, coordinate.x,
coordinate.y) = -1;
return(srMISS);
}
// Duplicate test.
if (gridvalue == -1 || gridvalue > HIT_OFFSET)
{
ocean.stats.duplicates++;
return(srDUPLICATE);
}
// If we're still here, it must've been a hit. Is it sunk?
ocean.stats.hits++;
ocean.boats[gridvalue].hits++;
*get_grid_value(ocean, coordinate.x, coordinate.y) += HIT_OFFSET;
if (ocean.boats[gridvalue].hits >= BOAT_LENGTH)
{
ocean.stats.sunk++;
return(srSUNK);
}
return(srHIT);
}
BoatPlacement PlaceBoat(Ocean &ocean, const Boat& boat)
{
// Perform edge checks.
if (boat.position.x < 0 || boat.position.x > ocean.x_quadrants
|| boat.position.y < 0 || boat.position.y > ocean.y_quadrants)
{
return(bpREJECTED);
}
if ((boat.orientation == oHORIZONTAL &&
((boat.position.x + BOAT_LENGTH) > ocean.x_quadrants)))
{
return(bpREJECTED);
}
if ((boat.orientation == oVERTICAL &&
((boat.position.y + BOAT_LENGTH) > ocean.y_quadrants)))
{
return(bpREJECTED);
}
// Perform overlap checks.
if (boat.orientation == oHORIZONTAL)
{
for (int i = 0; i < BOAT_LENGTH; i++)
{
if (*get_grid_value(ocean, boat.position.x + i,
boat.position.y) != 0)
{
return(bpREJECTED);
}
}
}
else
{
for (int i = 0; i < BOAT_LENGTH; i++)
{
if (*get_grid_value(ocean, boat.position.x,
boat.position.y + i) != 0)
{
return(bpREJECTED);
}
}
}
// All clear if it got here.
if (boat.orientation == oHORIZONTAL)
{
for (int i = 0; i < BOAT_LENGTH; i++)
{
*get_grid_value(ocean, boat.position.x + i,
boat.position.y) = boat.ID;
}
}
else
{
for (int i = 0; i < BOAT_LENGTH; i++)
{
*get_grid_value(ocean, boat.position.x,
boat.position.y + i) = boat.ID;
}
}
ocean.boats[boat.ID].hits = 0;
return(bpACCEPTED);
}
