コード例 #1
0
static void
buzztrack_preprocess (PELEMENT ElementPtr)
{
	if (ElementPtr->thrust_wait)
		--ElementPtr->thrust_wait;
	else
	{
		COUNT facing = 0;

		if (ElementPtr->hTarget == 0
				&& TrackShip (ElementPtr, &facing) < 0)
		{
			ZeroVelocityComponents (&ElementPtr->velocity);
		}
		else
		{
#define ACTIVATE_RANGE 224 /* Originally SPACE_WIDTH */
			SIZE delta_x, delta_y;
			ELEMENTPTR eptr;

			LockElement (ElementPtr->hTarget, &eptr);
			delta_x = eptr->current.location.x
					- ElementPtr->current.location.x;
			delta_y = eptr->current.location.y
					- ElementPtr->current.location.y;
			UnlockElement (ElementPtr->hTarget);
			delta_x = WRAP_DELTA_X (delta_x);
			delta_y = WRAP_DELTA_Y (delta_y);
			facing = NORMALIZE_FACING (
					ANGLE_TO_FACING (ARCTAN (delta_x, delta_y))
					);

			if (delta_x < 0)
				delta_x = -delta_x;
			if (delta_y < 0)
				delta_y = -delta_y;
			delta_x = WORLD_TO_DISPLAY (delta_x);
			delta_y = WORLD_TO_DISPLAY (delta_y);
			if (delta_x >= ACTIVATE_RANGE
					|| delta_y >= ACTIVATE_RANGE
					|| (DWORD)((UWORD)delta_x * delta_x)
					+ (DWORD)((UWORD)delta_y * delta_y) >=
					(DWORD)ACTIVATE_RANGE * ACTIVATE_RANGE)
			{
				ZeroVelocityComponents (&ElementPtr->velocity);
			}
			else
			{
				ElementPtr->thrust_wait = TRACK_WAIT;
				SetVelocityVector (&ElementPtr->velocity,
						DISPLAY_TO_WORLD (2), facing);
			}
		}
	}

	spin_preprocess (ElementPtr);
}
コード例 #2
0
ファイル: slykohr.c プロジェクト: jurchik/project6014
static void
decelerate_preprocess (ELEMENT *ElementPtr)
{
	SIZE dx, dy;

	GetCurrentVelocityComponents (&ElementPtr->velocity, &dx, &dy);
	dx /= 2;
	dy /= 2;
	SetVelocityComponents (&ElementPtr->velocity, dx, dy);
	if (dx == 0 && dy == 0)
	{
		ElementPtr->preprocess_func = buzztrack_preprocess;
	}

	spin_preprocess (ElementPtr);
}