Rotation and other stuff

iced-tetris/src/main.rs

@@ -6,6 +6,9 @@ use iced::{
 use iced_native::{event, subscription, Event};
 use rand::distributions::{Distribution, Standard};
 
+const START_LOCATION: (u8, u8) = (5, 1);
+type PieceBlocks = [(i8, i8); 4];
+
 fn main() -> iced::Result {
     Tetris::run(Settings::default())
 }
@@ -49,7 +52,9 @@ impl Application for Tetris {
                     self.ticks += 1
                 }
             }
-            Message::Up => (),
+            Message::Up => {
+                self.blocks.rotate_active_piece();
+            }
             Message::Down => {
                 self.blocks.move_active_piece(MoveDirection::HardDrop);
             }
@@ -164,6 +169,7 @@ struct BlockGrid {
 struct ActivePiece {
     location: (u8, u8),
     tetromino: Tetromino,
+    orientation: Orientation,
 }
 
 impl ActivePiece {
@@ -172,6 +178,7 @@ impl ActivePiece {
         let (cur_x, cur_y) = self.location;
         ActivePiece {
             tetromino: self.tetromino,
+            orientation: self.orientation,
             location: match direction {
                 Left => (cur_x.checked_sub(1).unwrap_or(0), cur_y),
                 Right => (cur_x + 1, cur_y),
@@ -180,6 +187,19 @@ impl ActivePiece {
             },
         }
     }
+
+    fn rotate_piece(&self) -> ActivePiece {
+        ActivePiece {
+            tetromino: self.tetromino,
+            location: self.location,
+            orientation: match self.orientation {
+                Orientation::A => Orientation::B,
+                Orientation::B => Orientation::C,
+                Orientation::C => Orientation::D,
+                Orientation::D => Orientation::A,
+            },
+        }
+    }
 }
 
 impl BlockGrid {
@@ -195,11 +215,12 @@ impl BlockGrid {
     fn drop_piece(&mut self, tetromino: Tetromino) -> bool {
         if let None = self.active_piece {
             let piece = ActivePiece {
-                location: (4, 0),
+                location: START_LOCATION,
                 tetromino,
+                orientation: Orientation::A,
             };
             let piece_blocks = Self::piece_blocks(&piece);
-            if self.piece_blocks_in_bounds(&piece_blocks) {
+            if self.piece_blocks_in_bounds(piece_blocks) {
                 self.active_piece = Some(piece);
                 true
             } else {
@@ -210,11 +231,11 @@ impl BlockGrid {
         }
     }
 
-    fn piece_blocks_in_bounds(&self, piece_blocks: &[(u8, u8); 4]) -> bool {
+    fn piece_blocks_in_bounds(&self, piece_blocks: PieceBlocks) -> bool {
         piece_blocks.iter().all(|(x, y)| {
             let x = *x;
             let y = *y;
-            x < 10 && y < 20 && self.state[x as usize][y as usize].is_none()
+            x >= 0 && y >= 0 && x < 10 && y < 20 && self.state[x as usize][y as usize].is_none()
         })
     }
 
@@ -227,7 +248,7 @@ impl BlockGrid {
             (Some(piece), MoveDirection::Left | MoveDirection::Right) => {
                 let new_piece = piece.move_piece(&direction);
                 let new_blocks = Self::piece_blocks(&new_piece);
-                if self.piece_blocks_in_bounds(&new_blocks) {
+                if self.piece_blocks_in_bounds(new_blocks) {
                     self.active_piece = Some(new_piece);
                     true
                 } else {
@@ -239,7 +260,7 @@ impl BlockGrid {
                 loop {
                     let p = new_piece.move_piece(&MoveDirection::SoftDrop);
                     let new_blocks = Self::piece_blocks(&p);
-                    if self.piece_blocks_in_bounds(&new_blocks) {
+                    if self.piece_blocks_in_bounds(new_blocks) {
                         new_piece = p;
                     } else {
                         break;
@@ -253,7 +274,7 @@ impl BlockGrid {
             (Some(ref piece), MoveDirection::SoftDrop) => {
                 let new_piece = piece.move_piece(&MoveDirection::SoftDrop);
                 let new_blocks = Self::piece_blocks(&new_piece);
-                if self.piece_blocks_in_bounds(&new_blocks) {
+                if self.piece_blocks_in_bounds(new_blocks) {
                     self.active_piece = Some(new_piece);
                     true
                 } else {
@@ -264,6 +285,22 @@ impl BlockGrid {
         }
     }
 
+    fn rotate_active_piece(&mut self) -> bool {
+        let active = self.active_piece;
+        if let Some(piece) = active {
+            let new_piece = piece.rotate_piece();
+            let new_blocks = Self::piece_blocks(&new_piece);
+            if self.piece_blocks_in_bounds(new_blocks) {
+                self.active_piece = Some(new_piece);
+                true
+            } else {
+                false
+            }
+        } else {
+            false
+        }
+    }
+
     /// Remove the currently active piece and place its blocks onto the board.
     fn place_active_piece(&mut self) {
         if let Some(piece) = self.active_piece {
@@ -277,29 +314,49 @@ impl BlockGrid {
         }
     }
 
-    fn piece_blocks(piece: &ActivePiece) -> [(u8, u8); 4] {
+    fn piece_blocks(piece: &ActivePiece) -> PieceBlocks {
+        use Orientation::*;
         use Tetromino::*;
         let (x, y) = piece.location;
+        let (x, y) = (x as i8, y as i8);
 
-        match piece.tetromino {
+        // These use the "Original Rotation System" cf. Tetris wiki
-            I => [(x, y), (x, y + 1), (x, y + 2), (x, y + 3)],
+        match (piece.tetromino, piece.orientation) {
-            J => [(x, y), (x, y + 1), (x, y + 2), (x - 1, y + 2)],
+            (I, A | C) => [(x - 2, y), (x - 1, y), (x, y), (x + 1, y)],
-            L => [(x, y), (x, y + 1), (x, y + 2), (x + 1, y + 2)],
+            (I, B | D) => [(x, y - 1), (x, y), (x, y + 1), (x, y + 2)],
-            O => [(x, y), (x + 1, y), (x, y + 1), (x + 1, y + 1)],
+            (J, A) => [(x - 1, y), (x, y), (x + 1, y), (x + 1, y + 1)],
-            S => [(x, y + 1), (x + 1, y + 1), (x + 1, y), (x + 2, y)],
+            (J, B) => [(x, y), (x + 1, y), (x, y + 1), (x, y + 2)],
-            T => [(x, y), (x + 1, y), (x + 2, y), (x + 1, y + 1)],
+            (J, C) => [(x - 1, y), (x - 1, y + 1), (x, y + 1), (x + 1, y + 1)],
-            Z => [(x, y), (x + 1, y), (x + 1, y + 1), (x + 2, y + 1)],
+            (J, D) => [(x, y), (x, y + 1), (x, y + 2), (x - 1, y + 2)],
+            (L, A) => [(x - 1, y + 1), (x - 1, y), (x, y), (x + 1, y)],
+            (L, B) => [(x, y), (x, y + 1), (x, y + 2), (x + 1, y + 2)],
+            (L, C) => [(x - 1, y + 1), (x, y + 1), (x + 1, y + 1), (x + 1, y)],
+            (L, D) => [(x - 1, y), (x, y), (x, y + 1), (x, y + 2)],
+            (O, _) => [(x, y), (x, y + 1), (x - 1, y), (x - 1, y + 1)],
+            (S, A | C) => [(x - 1, y + 1), (x, y + 1), (x, y), (x + 1, y)],
+            (S, B | D) => [(x, y), (x, y + 1), (x + 1, y + 1), (x + 1, y + 2)],
+            (T, A) => [(x - 1, y), (x, y), (x + 1, y), (x, y + 1)],
+            (T, B) => [(x, y), (x, y + 1), (x + 1, y + 1), (x, y + 2)],
+            (T, C) => [(x, y), (x - 1, y + 1), (x, y + 1), (x + 1, y + 1)],
+            (T, D) => [(x - 1, y + 1), (x, y), (x, y + 1), (x, y + 2)],
+            (Z, A | C) => [(x - 1, y + 1), (x, y + 1), (x, y + 2), (x + 1, y + 2)],
+            (Z, B | D) => [(x, y), (x, y + 1), (x + 1, y), (x + 1, y - 1)],
         }
     }
 
-    fn active_piece_blocks(&self) -> Option<(Tetromino, [(u8, u8); 4])> {
-        self.active_piece
-            .as_ref()
-            .map(|piece| (piece.tetromino, Self::piece_blocks(&piece)))
-    }
-
     fn iter<'a>(&'a self) -> BlockGridIter<'a> {
-        BlockGridIter::new(&self.state, self.active_piece_blocks())
+        let active_piece_blocks = self.active_piece.as_ref().map(|piece| {
+            let b = Self::piece_blocks(piece);
+            let blocks = [
+                (b[0].0 as u8, b[0].1 as u8),
+                (b[1].0 as u8, b[1].1 as u8),
+                (b[2].0 as u8, b[2].1 as u8),
+                (b[3].0 as u8, b[3].1 as u8),
+            ];
+
+            (piece.tetromino, blocks)
+        });
+        BlockGridIter::new(&self.state, active_piece_blocks)
     }
 }
 
@@ -355,7 +412,7 @@ struct Block {
     source: Tetromino,
 }
 
-#[derive(Debug, Copy, Clone, PartialEq)]
+#[derive(Debug, Copy, Clone)]
 enum MoveDirection {
     Left,
     Right,
@@ -363,6 +420,14 @@ enum MoveDirection {
     SoftDrop,
 }
 
+#[derive(Debug, Copy, Clone)]
+enum Orientation {
+    A,
+    B,
+    C,
+    D,
+}
+
 #[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
 enum Tetromino {
     I,