Function Unit_GetTileEnterScore

src/unit.c:2335–2387

* Get the score of entering this tile from a direction. * * @param unit The Unit to operate on. * @param packed The packed tile. * @param direction The direction entering this tile from. * @return 256 if tile is not accessable, -1 when it is an accessable structure, * or a score to enter the tile otherwise. */

 *   or a score to enter the tile otherwise.
 */
int16 Unit_GetTileEnterScore(Unit *unit, uint16 packed, uint16 orient8)
{
	const UnitInfo *ui;
	Unit *u;
	Structure *s;
	uint16 type;
	uint16 res;

	if (unit == NULL) return 0;

	ui = &g_table_unitInfo[unit->o.type];

	if (!Map_IsValidPosition(packed) && ui->movementType != MOVEMENT_WINGER) return 256;

	u = Unit_Get_ByPackedTile(packed);
	if (u != NULL && u != unit && unit->o.type != UNIT_SANDWORM) {
		if (unit->o.type == UNIT_SABOTEUR && unit->targetMove == Tools_Index_Encode(u->o.index, IT_UNIT)) return 0;

		if (House_AreAllied(Unit_GetHouseID(u), Unit_GetHouseID(unit))) return 256;
		if (g_table_unitInfo[u->o.type].movementType != MOVEMENT_FOOT || (ui->movementType != MOVEMENT_TRACKED && ui->movementType != MOVEMENT_HARVESTER)) return 256;
	}

	s = Structure_Get_ByPackedTile(packed);
	if (s != NULL) {
		res = Unit_IsValidMovementIntoStructure(unit, s);
		if (res == 0) return 256;
		return -res;
	}

	type = Map_GetLandscapeType(packed);

	if (g_dune2_enhanced) {
		res = g_table_landscapeInfo[type].movementSpeed[ui->movementType] * ui->movingSpeedFactor / 256;
	} else {
		res = g_table_landscapeInfo[type].movementSpeed[ui->movementType];
	}

	if (unit->o.type == UNIT_SABOTEUR && type == LST_WALL) {
		if (!House_AreAllied(g_map[packed].houseID, Unit_GetHouseID(unit))) res = 255;
	}

	if (res == 0) return 256;

	/* Check if the unit is travelling diagonally. */
	if ((orient8 & 1) != 0) {
		res -= res / 4 + res / 8;
	}

	/* 'Invert' the speed to get a rough estimate of the time taken. */
	res ^= 0xFF;

	return (int16)res;
}

/**
 * Gets the best target for the given unit.