Skip is still buggy but just... less so.

It is buggy, but it is something...

src/bin/tetris/main.rs

@@ -42,13 +42,13 @@ fn main() {
                 add_piece
                     .run_if(not(any_with_component::<Shape>))
                     .after(update_next_shapes),
-                update_shape_blocks
-                    .run_if(any_component_added::<Shape>.or(any_component_changed::<Shape>)),
                 falling
                     .run_if(in_state(GameState::Falling))
                     .run_if(clock_cycle(1.0)),
                 update_position.run_if(any_component_changed::<GridPosition>),
-                deactivate_shape.run_if(any_component_removed::<Shape>),
+                update_shape_blocks
+                    .run_if(any_component_added::<Shape>.or(any_component_changed::<Shape>)).after(update_position),
+                deactivate_shape.run_if(any_component_removed::<Shape>).after(update_shape_blocks),
                 check_line_removal,
                 // Clearing lines systems
                 clear_line.run_if(any_component_changed::<LineBlocks>),
@@ -487,8 +487,32 @@ impl Shape {
 
         output
     }
+
+    fn height(&self) -> usize {
+        let mut x = 0;
+
+        match self {
+            Self::M4(this) => {
+                for i in 0..4 {
+                    if this.col(i).to_array().contains(&1.0) {
+                        x += 1
+                    }
+                }
+            }
+            Self::M3(this) => {
+                for i in 0..3 {
+                    if this.col(i).to_array().contains(&1.0) {
+                        x += 1
+                    }
+                }
+            }
+        };
+
+        x
+    }
 }
 
+// TODO: move to trigger
 fn update_position(
     mut changed: Query<
         (Entity, &GridPosition, &mut Transform),
@@ -506,9 +530,9 @@ fn update_position(
     });
 }
 
-// TODO: Inline this to when movement occurs
+// TODO: Move to trigger
 fn update_shape_blocks(
-    query: Query<(Entity, &Shape, &GridPosition), Or<(Added<Shape>, Changed<Shape>)>>,
+    query: Query<(Entity, &Shape, &GridPosition), Or<(Added<Shape>, Changed<Shape>, Added<GridPosition>, Changed<GridPosition>)>>,
     mut blocks: Query<&mut GridPosition, (With<ShapeBlock>, Without<Shape>)>,
     mut commands: Commands,
     visuals: Res<Visuals>,
@@ -565,6 +589,9 @@ fn kb_input(
                         KeyCode::ArrowRight => {
                             commands.entity(e).trigger(Movement::Right);
                         }
+                        KeyCode::Space => {
+                            commands.entity(e).trigger(Movement::Skip);
+                        }
                         KeyCode::Escape => next.set(match curr.get() {
                             GameState::Falling => GameState::Pause,
                             GameState::Pause => GameState::Falling,
@@ -617,10 +644,11 @@ fn clock_cycle(n: f32) -> impl FnMut(Res<Time>, Local<f32>) -> bool {
 }
 
 fn add_piece(mut commands: Commands, mut shapes: ResMut<ShapesBuffer>) {
+    let this_shape = shapes.next.pop_front().unwrap();
     commands
         .spawn((
-            GridPosition::default(),
+            GridPosition { y: Y_MAX - this_shape.height(), ..default() },
-            shapes.next.pop_front().unwrap(),
+            this_shape,
         ))
         .observe(movement);
 }
@@ -705,6 +733,7 @@ enum Movement {
     Left,
     Right,
     Rotate,
+    Skip,
 }
 
 // TODO: When out of bounds left/right, try to move piece away from wall
@@ -719,18 +748,24 @@ fn movement(
         shape.get_mut(trigger.target()),
         grid_positions.get(trigger.target()),
     ) {
-        let (new_center, new_shape) = match trigger.event() {
+        let new_positions = match trigger.event() {
-            Movement::Down => (center.with_offset(0, -1), *this_shape),
+            Movement::Down => vec![center.with_offset(0, -1)],
-            Movement::Left => (center.with_offset(-1, 0), *this_shape),
+            Movement::Left => vec![center.with_offset(-1, 0)],
-            Movement::Right => (center.with_offset(1, 0), *this_shape),
+            Movement::Right => vec![center.with_offset(1, 0)],
-            Movement::Rotate => (Ok(*center), this_shape.rotated()),
+            Movement::Rotate => vec![Ok(*center)],
+            Movement::Skip => (1..=center.y).map(|i| center.with_offset(0, -(i as isize))).collect(),
+        };
+        let new_shape = match trigger.event() {
+            Movement::Down | Movement::Left | Movement::Right | Movement::Skip => *this_shape,
+            Movement::Rotate => this_shape.rotated(),
         };
         debug!(
             "Proposed change: {:?}\n{}",
-            new_center,
+            new_positions,
             new_shape.as_ascii()
         );
-        match new_center {
+        for position in new_positions {
+            match position {
                 Err(GameError::OutOfBoundsLeft) | Err(GameError::OutOfBoundsRight) => (), // Do nothing
                 Err(GameError::OutOfBoundsDown) => {
                     commands.entity(trigger.target()).remove::<Shape>();
@@ -764,14 +799,18 @@ fn movement(
                             }
                         }
                     }
+                    debug!("Checks passed for {position:?}, committing change");
+
                     // Update center
                     let mut gp = grid_positions.get_mut(trigger.target()).unwrap();
                     *gp = new_center;
+
                     // Update shape/rotation
                     let mut s = shape.get_mut(trigger.target()).unwrap();
                     *s = new_shape;
                 }
             }
+        }
     } else {
         warn!("Triggered movement on non-shape entity");
     }
@@ -796,13 +835,15 @@ fn deactivate_shape(
     events.read().for_each(|target| {
         parent.iter_descendants(target).for_each(|block| {
             let GridPosition { y, .. } = grid_positions.get(block).unwrap();
-            let parent_line = lines
+            if let Some(parent_line) = lines
                 .iter()
-                .find_map(|(e, Line(i))| (*y == *i).then_some(e))
+                .find_map(|(e, Line(i))| (*y == *i).then_some(e)) {
-                .unwrap(); // TODO: This crashed once kinda late in a game... why?
                 commands
                     .entity(parent_line)
                     .add_one_related::<LineBlock>(block);
+            } else {
+                error!("wtf?");
+            }
         });
         commands.entity(target).despawn();
     });

src/bin/tetris/test.rs

@@ -83,3 +83,10 @@ fn test_coordinates() {
 
     assert_eq!(actual, expected);
 }
+
+#[test]
+fn test_height() {
+    assert_eq!(Shape::new_t().height(), 2);
+    assert_eq!(Shape::new_i().height(), 4);
+    assert_eq!(Shape::new_l().height(), 3);
+}