feat(settings/user/snake): improve snake design

app/components/Settings/BottomScreen/Menus/User/Snake.vue

@@ -289,29 +289,99 @@ onRender((ctx) => {
     }
   } else {
     // food
+    const foodPos = cellToBoardPos(food);
     ctx.fillStyle = "#ff2020";
-    ctx.fillRect(
-      cellToBoardPos(food).x + 1,
-      cellToBoardPos(food).y + 1,
-      CELL_SIZE,
-      CELL_SIZE,
-    );
+    ctx.fillRect(foodPos.x + 1, foodPos.y + 1, CELL_SIZE, CELL_SIZE);
 
     // snake
-    for (const part of tail) {
-      ctx.fillStyle = state.value === "dead" ? "#991010" : "#20ff20";
-      ctx.fillRect(
-        cellToBoardPos(part).x + 1,
-        cellToBoardPos(part).y + 1,
-        CELL_SIZE,
-        CELL_SIZE,
-      );
+    const snakeParts = [...tail, position];
+    const dead = state.value === "dead";
+    const FILL = dead ? "#b84800" : "#ff8c00";
+    const FILL_DIM = dead ? "#8c3600" : "#cc7000";
+
+    const connectedTo = (i: number, dx: number, dy: number) => {
+      const part = snakeParts[i]!;
+      const neighbor = new THREE.Vector2(part.x + dx, part.y + dy);
+      const prev = snakeParts[i - 1];
+      const next = snakeParts[i + 1];
+      return (prev && prev.equals(neighbor)) || (next && next.equals(neighbor));
+    };
+
+    // fills
+    for (let i = 0; i < snakeParts.length; i++) {
+      const part = snakeParts[i]!;
+      const { x, y } = cellToBoardPos(part);
+      const px = x + 1;
+      const py = y + 1;
+
+      ctx.fillStyle = i === snakeParts.length - 1 ? FILL : FILL_DIM;
+      ctx.fillRect(px, py, CELL_SIZE, CELL_SIZE);
+
+      if (connectedTo(i, 1, 0)) {
+        ctx.fillRect(px + CELL_SIZE, py, CELL_PADDING, CELL_SIZE);
       }
-    assets.user.snakeHead.draw(
-      ctx,
-      cellToBoardPos(position).x + 1,
-      cellToBoardPos(position).y,
-    );
+      if (connectedTo(i, 0, 1)) {
+        ctx.fillRect(px, py + CELL_SIZE, CELL_SIZE, CELL_PADDING);
+      }
+    }
+
+    // outlines
+    ctx.fillStyle = "#ffffff";
+    for (let i = 0; i < snakeParts.length; i++) {
+      const part = snakeParts[i]!;
+      const { x, y } = cellToBoardPos(part);
+      const px = x + 1;
+      const py = y + 1;
+
+      if (!connectedTo(i, 0, -1)) {
+        ctx.fillRect(px, py, CELL_SIZE, 1);
+      }
+      if (!connectedTo(i, 0, 1)) {
+        ctx.fillRect(px, py + CELL_SIZE - 1, CELL_SIZE, 1);
+      }
+      if (!connectedTo(i, -1, 0)) {
+        ctx.fillRect(px, py, 1, CELL_SIZE);
+      }
+      if (!connectedTo(i, 1, 0)) {
+        ctx.fillRect(px + CELL_SIZE - 1, py, 1, CELL_SIZE);
+      }
+    }
+
+    const EYE_SIZE = 2;
+    const EYE_MARGIN = 3;
+    const eyeFar = CELL_SIZE - EYE_MARGIN - EYE_SIZE;
+
+    const head = snakeParts[snakeParts.length - 1]!;
+    const { x: headCellX, y: headCellY } = cellToBoardPos(head);
+    const headX = headCellX + 1;
+    const headY = headCellY + 1;
+
+    let eye1x: number, eye1y: number, eye2x: number, eye2y: number;
+    if (direction.x === 1) {
+      eye1x = headX + eyeFar;
+      eye1y = headY + EYE_MARGIN;
+      eye2x = headX + eyeFar;
+      eye2y = headY + eyeFar;
+    } else if (direction.x === -1) {
+      eye1x = headX + EYE_MARGIN;
+      eye1y = headY + EYE_MARGIN;
+      eye2x = headX + EYE_MARGIN;
+      eye2y = headY + eyeFar;
+    } else if (direction.y === 1) {
+      eye1x = headX + EYE_MARGIN;
+      eye1y = headY + eyeFar;
+      eye2x = headX + eyeFar;
+      eye2y = headY + eyeFar;
+    } else {
+      eye1x = headX + EYE_MARGIN;
+      eye1y = headY + EYE_MARGIN;
+      eye2x = headX + eyeFar;
+      eye2y = headY + EYE_MARGIN;
+    }
+
+    ctx.fillStyle = dead ? "#3d1500" : "#7a3800";
+    ctx.fillRect(eye1x, eye1y, EYE_SIZE, EYE_SIZE);
+    ctx.fillRect(eye2x, eye2y, EYE_SIZE, EYE_SIZE);
   }
 
   ctx.restore();
@@ -353,7 +423,7 @@ useKeyDown(({ key }) => {
       break;
   }
 
-  if (newDirection.clone().dot(direction) === 0) {
+  if (newDirection.dot(direction) === 0) {
     nextDirection.copy(newDirection);
     atlas.audio.type.play(0.35);
   }