reimplement marble behavior, making it more consistent in different directions. Triggers no longer activate from blocked marbles, and bounces take the same amount of time to travel through a chain of marbles in all directions
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82d0ff0f37
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4 changed files with 167 additions and 100 deletions
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@ -108,110 +108,179 @@ impl Machine {
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}
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}
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}
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let mut to_remove = Vec::new();
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let mut triggers = Vec::new();
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for i in 0..self.marbles.len() {
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let marble_pos = self.marbles[i];
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let tile = self.board.get_or_blank(marble_pos);
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let Tile::Marble { value, dir } = tile else {
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continue;
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};
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let next_pos = dir.step(marble_pos);
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if !self.board.pos_in_bounds(next_pos) {
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#[derive(Debug, Clone, Copy)]
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enum Event {
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Stay,
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/// (new_pos, new_dir)
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MoveTo(Pos, Direction),
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/// (new_pos, new_dir, trigger_pos)
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Trigger(Pos, Direction, Pos),
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/// (other, new_dir)
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/// other marble should be set to reverse of new_dir
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/// and should be cancelled if it had a movement event planned
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Bounce(usize, Direction),
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Remove,
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}
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let mut marble_events: Vec<Event> = self
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.marbles
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.iter()
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.map(|&pos| {
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let marble = self.board.get(pos).unwrap();
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let Tile::Marble { value: _, dir } = marble else {
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panic!("broken marble");
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};
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let front_pos = dir.step(pos);
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let Some(front_tile) = self.board.get(front_pos) else {
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return Event::Stay;
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};
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if let Tile::Powerable(PTile::Bag, _) = front_tile {
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return Event::Remove;
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}
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let can_move_to = |tile| matches!(tile, Some(Tile::Blank | Tile::Digit(_)));
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let can_move_over = |tile| match tile {
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Tile::Mirror(mirror) => {
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let new_dir = mirror.new_dir(dir);
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let target_pos = new_dir.step(front_pos);
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let target = self.board.get(target_pos);
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if can_move_to(target) {
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Some((target_pos, new_dir))
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} else {
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None
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}
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}
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Tile::Arrow(new_dir) => {
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let target_pos = new_dir.step(front_pos);
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let target = self.board.get(target_pos);
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if target_pos == pos || can_move_to(target) {
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Some((target_pos, new_dir))
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} else {
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None
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}
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}
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_ => None,
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};
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if can_move_to(Some(front_tile)) {
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Event::MoveTo(front_pos, dir)
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} else if let Tile::Powerable(PTile::Trigger, _) = front_tile {
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let target_pos = dir.step(front_pos);
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let target = self.board.get(target_pos);
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if can_move_to(target) {
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Event::Trigger(target_pos, dir, front_pos)
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} else {
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Event::Stay
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}
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} else if let Some((new_pos, new_dir)) = can_move_over(front_tile) {
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Event::MoveTo(new_pos, new_dir)
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} else if let Tile::Marble {
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value: _,
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dir: other_dir,
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} = front_tile
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{
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if other_dir != dir {
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Event::Bounce(
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self.marbles.iter().position(|m| m == &front_pos).unwrap(),
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dir.opposite(),
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)
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} else {
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Event::Stay
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}
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} else {
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Event::Stay
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}
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})
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.collect();
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// resolve bounces
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for i in 0..marble_events.len() {
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let event = marble_events[i];
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if let Event::Bounce(other_index, dir) = event {
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match marble_events[other_index] {
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// cancel bounces on marble that are about to disappear
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Event::Remove => {
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marble_events[i] = Event::MoveTo(self.marbles[other_index], dir.opposite())
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}
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// let already bouncing marbles continue
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Event::Bounce(_, _) => (),
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// interrupt any other movement/staying to bounce
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_ => marble_events[other_index] = Event::Bounce(i, dir.opposite()),
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}
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}
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}
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// resolve deletions of tiles
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for (i, event) in marble_events.iter().enumerate() {
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if let Event::Remove = event {
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self.board.set(self.marbles[i], Tile::Blank);
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}
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}
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// resolve triggers
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let mut triggers_activated = Vec::new();
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for event in &mut marble_events {
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if let Event::Trigger(new_pos, dir, trigger_pos) = event {
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triggers_activated.push(*trigger_pos);
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*event = Event::MoveTo(*new_pos, *dir);
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}
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}
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// resolve collisions (multiple marbles entering the same space)
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for i in 0..(marble_events.len() - 1) {
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let event = marble_events[i];
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if let Event::MoveTo(new_pos, _dir) = event {
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for other_event in &mut marble_events[(i + 1)..] {
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if let Event::MoveTo(other_pos, _other_dir) = other_event {
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// todo: maybe sort by direction so the sucessful direction is consistent
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if other_pos == &new_pos {
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*other_event = Event::Stay;
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}
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}
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}
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}
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}
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// resolve movement
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for (i, &event) in marble_events.iter().enumerate() {
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if let Event::Remove = event {
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continue;
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}
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let mut new_tile = None;
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let Some(target) = self.board.get_mut(next_pos) else {
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continue;
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let marble = self.board.get_mut(self.marbles[i]).unwrap();
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let Tile::Marble { value, dir } = marble else {
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panic!("invalid marble");
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};
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match target {
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Tile::Blank => {
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*target = tile;
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self.marbles[i] = next_pos;
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new_tile = Some(Tile::Blank);
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}
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Tile::Digit(d) => {
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let new_val = value.wrapping_mul(10).wrapping_add(*d as MarbleValue);
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*target = Tile::Marble {
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value: new_val,
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dir,
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match event {
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Event::MoveTo(new_pos, new_dir) => {
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let mut value = *value;
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self.board.set(self.marbles[i], Tile::Blank);
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self.marbles[i] = new_pos;
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let new_tile = self.board.get_mut(new_pos).unwrap();
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if let Tile::Digit(n) = new_tile {
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value = value.wrapping_mul(10).wrapping_add(*n as MarbleValue);
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}
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*new_tile = Tile::Marble {
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value,
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dir: new_dir,
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};
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self.marbles[i] = next_pos;
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new_tile = Some(Tile::Blank);
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}
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Tile::Powerable(PTile::Bag, _) => {
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to_remove.push(i);
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new_tile = Some(Tile::Blank);
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}
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Tile::Marble {
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value: _other_value,
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dir: other_dir,
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} => {
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// bounce off other marbles
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if *other_dir != dir {
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new_tile = Some(Tile::Marble {
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value,
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dir: dir.opposite(),
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});
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*other_dir = dir;
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}
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}
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Tile::Powerable(PTile::Trigger, state) => {
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// triggers activate even if the marble can't move past it
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// making it stay on permanently (or until the marble is knocked away)
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*state = true;
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triggers.push(next_pos);
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let far_pos = dir.step(next_pos);
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if let Some(target) = self.board.get_blank_mut(far_pos) {
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*target = tile;
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self.marbles[i] = far_pos;
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new_tile = Some(Tile::Blank);
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}
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}
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Tile::Arrow(arrow_dir) => {
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let far_pos = arrow_dir.step(next_pos);
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let arrow_dir = *arrow_dir;
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if let Some(target) = self.board.get_blank_mut(far_pos) {
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self.marbles[i] = far_pos;
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*target = Tile::Marble {
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value,
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dir: arrow_dir,
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};
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new_tile = Some(Tile::Blank);
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} else if far_pos == marble_pos {
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// always bounce on reverse arrow
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new_tile = Some(Tile::Marble {
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value,
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dir: dir.opposite(),
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});
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}
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}
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Tile::Mirror(mirror) => {
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let new_dir = mirror.new_dir(dir);
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let far_pos = new_dir.step(next_pos);
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if let Some(far_target) = self.board.get_blank_mut(far_pos) {
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*far_target = Tile::Marble {
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value,
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dir: new_dir,
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};
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self.marbles[i] = far_pos;
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new_tile = Some(Tile::Blank);
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}
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}
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Event::Bounce(_other, new_dir) => *dir = new_dir,
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_ => (),
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}
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}
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if let Some(t) = new_tile {
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*self.board.get_mut(marble_pos).unwrap() = t;
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// resolve deletions of marbles
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for (i, event) in marble_events.iter().enumerate().rev() {
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if let Event::Remove = event {
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self.marbles.remove(i);
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}
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}
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let mut offset = 0;
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for i in to_remove {
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self.marbles.remove(i - offset);
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offset += 1;
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}
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for pos in triggers {
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// process triggers
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for pos in triggers_activated {
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for dir in Direction::ALL {
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self.propagate_power(dir, dir.step(pos));
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}
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@ -118,10 +118,6 @@ impl Board {
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sum
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}
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pub fn pos_in_bounds(&self, p: Pos) -> bool {
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self.in_bounds(p)
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}
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fn in_bounds(&self, p: Pos) -> bool {
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p.x >= 0 && p.y >= 0 && p.x < self.width as isize && p.y < self.height as isize
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}
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@ -10,7 +10,7 @@ use crate::{level::Level, userdata_dir};
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#[derive(Debug, Clone, Serialize, Deserialize)]
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pub struct Solution {
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solution_id: String,
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level_id: String, // redundant?
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level_id: String,
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pub name: String,
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pub board: String,
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#[serde(default)]
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