Esempio n. 1
0
static bool WouldCollide(const Game_Character& self, const Game_Character& other, bool self_conflict) {
	if (self.GetThrough() || other.GetThrough()) {
		return false;
	}

	if (self.IsFlying() || other.IsFlying()) {
		return false;
	}

	if (!self.IsActive() || !other.IsActive()) {
		return false;
	}

	if (self.GetType() == Game_Character::Event
			&& other.GetType() == Game_Character::Event
			&& (self.IsOverlapForbidden() || other.IsOverlapForbidden())) {
		return true;
	}

	if (other.GetLayer() == RPG::EventPage::Layers_same && self_conflict) {
		return true;
	}

	if (self.GetLayer() == other.GetLayer()) {
		return true;
	}

	return false;
}
Esempio n. 2
0
/**
 * Checks whether a collision occurs between self and other if self
 * moves from (x,y) to (new_x, new_y) in direction d.
 *
 * If other is a tile event, also indicates if the player can use it
 * as a "bridge" to step across without hitting the underlying tile
 * layer.
 */
static CollisionResult TestCollisionDuringMove(
	int x,
	int y,
	int new_x,
	int new_y,
	int d,
	const Game_Character& self,
	const Game_Event& other
) {
	if (!other.GetActive()) {
		return NoCollision;
	}

	if (&self == &other) {
		return NoCollision;
	}

	if (other.GetThrough()) {
		return NoCollision;
	}

	if (!other.IsInPosition(x, y) && !other.IsInPosition(new_x, new_y)) {
		return NoCollision;
	}

	if (&self != Main_Data::game_player.get()) {
		if (other.IsInPosition(new_x, new_y) && (self.IsOverlapForbidden() || other.IsOverlapForbidden())) {
			return Collision;
		}
	}

	if (other.IsInPosition(new_x, new_y) && self.GetLayer() == other.GetLayer()) {
		return Collision;
	}

	if (other.GetLayer() == RPG::EventPage::Layers_below) {
		int tile_id = other.GetTileId();
		if ((passages_up[tile_id] & Passable::Above) != 0) {
			return NoCollision;
		}
		if (other.IsInPosition(x,y) && (passages_up[tile_id] & DirToMask(d)) != 0) {
			return CanStepOffCurrentTile;
		}
		else if (other.IsInPosition(new_x, new_y) && (passages_up[tile_id] & DirToMask(Game_Character::ReverseDir(d))) != 0) {
			return CanStepOntoNewTile;
		} else {
			return Collision;
		}
	}

	return NoCollision;
}
Esempio n. 3
0
bool Game_Map::MakeWay(int x, int y, int d, const Game_Character& self, bool force_through) {
	int new_x = RoundX(x + (d == Game_Character::Right ? 1 : d == Game_Character::Left ? -1 : 0));
	int new_y = RoundY(y + (d == Game_Character::Down ? 1 : d == Game_Character::Up ? -1 : 0));

	if (!Game_Map::IsValid(new_x, new_y))
		return false;

	if (self.GetThrough() || force_through) return true;

	// A character can move to a position with an impassable tile by
	// standing on top of an event below it. These flags track whether
	// we stepped off an event and therefore don't need to check the
	// passability of the tile layer below.
	bool stepped_off_event = false;
	bool stepped_onto_event = false;

	for (Game_Event& other : GetEvents()) {
		CollisionResult result = TestCollisionDuringMove(x, y, new_x, new_y, d, self, other);
		if (result == Collision) {
			// Try updating the offending event to give it a chance to move out of the
			// way and recheck.
			other.UpdateParallel();
			if (TestCollisionDuringMove(x, y, new_x, new_y, d, self, other) == Collision) {
				return false;
			}
		}
		else if (result == CanStepOffCurrentTile) {
			stepped_off_event = true;
		} else if (result == CanStepOntoNewTile) {
			stepped_onto_event = true;
		}
	}

	if (vehicles[0]->IsInPosition(new_x, new_y) || vehicles[1]->IsInPosition(new_x, new_y)) {
		return false;
	}

	if (Main_Data::game_player->IsInPosition(new_x, new_y)
			&& !Main_Data::game_player->GetThrough()
			&& self.GetLayer() == RPG::EventPage::Layers_same) {
		// Update the Player to see if they'll move and recheck.
		Main_Data::game_player->Update(!first_frame);
		if (Main_Data::game_player->IsInPosition(new_x, new_y)) {
			return false;
		}
	}

	return
		(stepped_off_event || IsPassableTile(DirToMask(d), x + y * GetWidth()))
		&& (stepped_onto_event || IsPassableTile(DirToMask(Game_Character::ReverseDir(d)), new_x + new_y * GetWidth()));
}
Esempio n. 4
0
bool Game_Map::MakeWay(const Game_Character& self, int x, int y) {
	// Moving to same tile (used for jumps) always succeeds
	if (x == self.GetX() && y == self.GetY()) {
		return true;
	}
	if (!self.IsJumping() && x != self.GetX() && y != self.GetY()) {
		// Handle diagonal stepping.
		// Must be able to step on at least one of the 2 adjacent tiles and also the target tile.
		// Verified behavior: Always checks vertical first, only checks horizontal if vertical fails.
		bool vertical_ok = MakeWay(self, self.GetX(), y);
		if (!vertical_ok) {
			bool horizontal_ok = MakeWay(self, x, self.GetY());
			if (!horizontal_ok) {
				return false;
			}
		}
	}

	// Infer directions before we do any rounding.
	const auto bit_from = GetPassableMask(self.GetX(), self.GetY(), x, y);
	const auto bit_to = GetPassableMask(x, y, self.GetX(), self.GetY());

	// Now round for looping maps.
	x = Game_Map::RoundX(x);
	y = Game_Map::RoundY(y);

	// Note, even for diagonal, if the tile is invalid we still check vertical/horizontal first!
	if (!Game_Map::IsValid(x, y)) {
		return false;
	}

	if (self.GetThrough()) {
		return true;
	}

	const auto vehicle_type = static_cast<Game_Vehicle::Type>(self.GetVehicleType());

	bool self_conflict = false;
	if (!self.IsJumping()) {
		// Check for self conflict.
		// If this event has a tile graphic and the tile itself has passage blocked in the direction
		// we want to move, flag it as "self conflicting" for use later.
		if (self.GetLayer() == RPG::EventPage::Layers_below && self.GetTileId() != 0) {
			int tile_id = self.GetTileId();
			if ((passages_up[tile_id] & bit_from) == 0) {
				self_conflict = true;
			}
		}

		if (vehicle_type == Game_Vehicle::None) {
			// Check that we are allowed to step off of the current tile.
			// Note: Vehicles can always step off a tile.
			if (!IsPassableTile(&self, bit_from, self.GetX(), self.GetY())) {
				return false;
			}
		}
	}

	if (vehicle_type != Game_Vehicle::Airship) {
		// Check for collision with events on the target tile.
		for (auto& other: GetEvents()) {
			if (MakeWayCollideEvent(x, y, self, other, self_conflict)) {
				return false;
			}
		}
		auto& player = Main_Data::game_player;
		if (player->GetVehicleType() == Game_Vehicle::None) {
			if (MakeWayCollideEvent(x, y, self, *Main_Data::game_player, self_conflict)) {
				return false;
			}
		}
		for (auto vid: { Game_Vehicle::Boat, Game_Vehicle::Ship}) {
			auto& other = vehicles[vid - 1];
			if (other->IsInCurrentMap()) {
				if (MakeWayCollideEvent(x, y, self, *other, self_conflict)) {
					return false;
				}
			}
		}
		auto& airship = vehicles[Game_Vehicle::Airship - 1];
		if (airship->IsInCurrentMap() && self.GetType() != Game_Character::Player) {
			if (MakeWayCollideEvent(x, y, self, *airship, self_conflict)) {
				return false;
			}
		}
	}

	int bit = bit_to;
	if (self.IsJumping()) {
		bit = Passable::Down | Passable::Up | Passable::Left | Passable::Right;
	}

	return IsPassableTile(&self, bit, x, y);
}