🚀 add test for path to pose + fix path to pose

packages/demo/demo.getPathToPose.ts

@@ -0,0 +1,41 @@
+import "./menu";
+import { createCanvas } from "./canvas";
+import { createSnakeFromCells, snakeToCells } from "@snk/types/snake";
+import { grid, snake } from "./sample";
+import { getPathToPose } from "@snk/compute/getPathToPose";
+
+const { canvas, ctx, draw, highlightCell } = createCanvas(grid);
+canvas.style.pointerEvents = "auto";
+
+const target = createSnakeFromCells(
+  snakeToCells(snake).map((p) => ({ ...p, x: p.x - 1 }))
+);
+
+let chain = [snake, ...getPathToPose(snake, target)!];
+
+let i = 0;
+const onChange = () => {
+  ctx.clearRect(0, 0, 9999, 9999);
+
+  draw(grid, chain[i], []);
+  chain
+    .map(snakeToCells)
+    .flat()
+    .forEach(({ x, y }) => highlightCell(x, y));
+};
+
+onChange();
+
+const inputI = document.createElement("input") as any;
+inputI.type = "range";
+inputI.value = 0;
+inputI.max = chain ? chain.length - 1 : 0;
+inputI.step = 1;
+inputI.min = 0;
+inputI.style.width = "90%";
+inputI.style.padding = "20px 0";
+inputI.addEventListener("input", () => {
+  i = +inputI.value;
+  onChange();
+});
+document.body.append(inputI);