2023-02-24 17:02:20 -05:00
9 changed files with 898 additions and 39 deletions
--- a/euler-golf/css/styles.css
+++ b/euler-golf/css/styles.css
@ -0,0 +1,74 @@
+body {
+  margin: 0;
+  padding: 0;
+  overflow: scroll;
+  font-family: Lucida Console, Lucida Sans Typewriter, monaco,
+    Bitstream Vera Sans Mono, monospace;
+  width: 100vw;
+  height: 100vh;
+  background: rgb(238, 174, 202);
+  background: radial-gradient(
+    circle,
+    rgba(238, 174, 202, 1) 0%,
+    rgba(148, 187, 233, 1) 100%
+  );
+}
+
+.canvas {
+  padding: 0;
+  margin: auto;
+  display: block;
+  border: 1px solid black;
+
+  width: 100vw;
+  height: 100vw;
+}
+
+button {
+  border-radius: 5px;
+  padding: 5px;
+  cursor: pointer;
+  margin-left: 5px;
+}
+
+.controls {
+  cursor: pointer;
+  padding: 12px;
+  position: fixed;
+  bottom: 0;
+  right: 0;
+  background-color: rgba(255, 255, 255, 0.8);
+  border: 1px solid white;
+  border-radius: 8px;
+  margin-right: 6px;
+  margin-bottom: 6px;
+}
+
+.buttons {
+  display: flex;
+  justify-content: space-around;
+  align-items: center;
+}
+
+.modal {
+  display: flex;
+  position: absolute;
+  left: 50%;
+  top: 50%;
+  transform: translate(-50%, -50%);
+
+  width: 80vw;
+  max-width: 500px;
+  min-height: 200px;
+
+  padding: 12px;
+
+  background-color: rgba(255, 255, 255, 0.8);
+  border: 1px solid black;
+  border-radius: 15px;
+}
+
+.modal-body {
+  display: flex;
+  justify-content: center;
+}
--- a/euler-golf/index.html
+++ b/euler-golf/index.html
@ -0,0 +1,74 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>Euler Golf 2</title>
+    <link rel="stylesheet" type="text/css" href="css/styles.css" />
+  </head>
+  <body>
+    <canvas id="canvas"></canvas>
+
+    <div class="controls" id="controls-container">
+      <div id="controls" style="display: none">
+        <div class="buttons">
+          <button id="reset">Reset</button>
+          <button id="solve">Solve</button>
+          <button id="directions">Directions</button>
+        </div>
+      </div>
+      <span id="expand-show">↑↑</span>
+    </div>
+
+    <div
+      id="directions-modal"
+      class="modal"
+      style="display: none"
+      tabindex="-1"
+      role="dialog"
+    >
+      <button
+        type="button"
+        class="close"
+        data-dismiss="modal"
+        aria-label="Close"
+      >
+        <span aria-hidden="true">X</span>
+      </button>
+
+      <div class="modal-body">
+        <div style="margin: 0; display: inline-block">
+          <h1 style="text-align: center">Euler Golf 2</h1>
+          <p>
+            Use the left and right arrow keys as navigation & hover over the
+            bottom right corner for controls.
+          </p>
+          <p>Rules</p>
+          <ul>
+            <li>
+              Every move consists of a 90 degree rotation around your last
+              position.
+            </li>
+            <li>You begin at the point one unit right from the center.</li>
+            <li>
+              The inital point that you rotate around is the origin (blue).
+            </li>
+            <li>You must navigate to the target point (green).</li>
+          </ul>
+          <p>
+            Initial game by
+            <a href="https://kylehovey.github.io/EulerGolf/">speleo</a>,
+            reimplemented & solved by
+            <a href="https://github.com/Simponic">simponic</a>.
+          </p>
+        </div>
+      </div>
+    </div>
+
+    <script src="js/modal-vanilla.min.js"></script>
+
+    <script src="js/cx.js"></script>
+    <script src="js/json-ds.js"></script>
+    <script src="js/sol.js"></script>
+    <script src="js/game.js"></script>
+    <script src="js/controls.js"></script>
+  </body>
+</html>
--- a/euler-golf/js/controls.js
+++ b/euler-golf/js/controls.js
@ -0,0 +1,32 @@
+const directions_modal = new Modal({
+  el: document.getElementById("directions-modal"),
+});
+
+document
+  .getElementById("controls-container")
+  .addEventListener("mouseover", () => {
+    document.getElementById("controls").style.display = "block";
+    document.getElementById("expand-show").style.display = "none";
+  });
+document
+  .getElementById("controls-container")
+  .addEventListener("mouseout", () => {
+    document.getElementById("controls").style.display = "none";
+    document.getElementById("expand-show").style.display = "inline";
+  });
+
+document.getElementById("reset").addEventListener("click", () => {
+  state = reset_state(state);
+
+  state.target = rand_target(state.rows, state.cols);
+});
+
+document.getElementById("solve").addEventListener("click", () => {
+  if (!cx.eq(state.path.at(-2), new cx(0, 0))) state = reset_state(state);
+
+  state.solution = sol(state.target);
+});
+
+document
+  .getElementById("directions")
+  .addEventListener("click", () => directions_modal.show());
--- a/euler-golf/js/cx.js
+++ b/euler-golf/js/cx.js
@ -0,0 +1,308 @@
+// http://www.russellcottrell.com/fractalsEtc/cx.js
+
+class cx {
+  static degrees(d) {
+    cx._RD = d ? Math.PI / 180 : 1;
+  }
+  // Math.PI/180 for degrees, 1 for radians
+  // applies to i/o (constructor, get/set arg, and toString etc.)
+
+  constructor(x, y, polar) {
+    if (!polar) {
+      this.re = x;
+      this.im = y;
+    } else {
+      y *= cx._RD; // may be radians or degrees
+      this.re = x * Math.cos(y);
+      this.im = x * Math.sin(y);
+    }
+  }
+
+  get abs() {
+    return Math.sqrt(this.re * this.re + this.im * this.im);
+  }
+
+  set abs(r) {
+    var theta = this._arg;
+    this.re = r * Math.cos(theta);
+    this.im = r * Math.sin(theta);
+  }
+
+  get arg() {
+    // returns radians or degrees, non-negative
+    return (
+      ((Math.atan2(this.im, this.re) + 2 * Math.PI) % (2 * Math.PI)) / cx._RD
+    );
+  }
+
+  set arg(theta) {
+    // may be radians or degrees
+    var r = this.abs;
+    this.re = r * Math.cos(theta * cx._RD);
+    this.im = r * Math.sin(theta * cx._RD);
+  }
+
+  get _arg() {
+    // internal; returns radians
+    return Math.atan2(this.im, this.re);
+  }
+
+  static get i() {
+    return new cx(0, 1);
+  }
+
+  static set i(x) {
+    throw new Error("i is read-only");
+  }
+
+  toString(polar) {
+    if (!polar)
+      return (
+        this.re.toString() +
+        (this.im >= 0 ? " + " : " - ") +
+        Math.abs(this.im).toString() +
+        "i"
+      );
+    else return this.abs.toString() + " cis " + this.arg.toString();
+  }
+
+  toPrecision(n, polar) {
+    if (!polar)
+      return (
+        this.re.toPrecision(n) +
+        (this.im >= 0 ? " + " : " - ") +
+        Math.abs(this.im).toPrecision(n) +
+        "i"
+      );
+    else return this.abs.toPrecision(n) + " cis " + this.arg.toPrecision(n);
+  }
+
+  toPrecis(n, polar) {
+    // trims trailing zeros
+    if (!polar)
+      return (
+        parseFloat(this.re.toPrecision(n)).toString() +
+        (this.im >= 0 ? " + " : " - ") +
+        parseFloat(Math.abs(this.im).toPrecision(n)).toString() +
+        "i"
+      );
+    else
+      return (
+        parseFloat(this.abs.toPrecision(n)).toString() +
+        " cis " +
+        parseFloat(this.arg.toPrecision(n)).toString()
+      );
+  }
+
+  toFixed(n, polar) {
+    if (!polar)
+      return (
+        this.re.toFixed(n) +
+        (this.im >= 0 ? " + " : " - ") +
+        Math.abs(this.im).toFixed(n) +
+        "i"
+      );
+    else return this.abs.toFixed(n) + " cis " + this.arg.toFixed(n);
+  }
+
+  toExponential(n, polar) {
+    if (!polar)
+      return (
+        this.re.toExponential(n) +
+        (this.im >= 0 ? " + " : " - ") +
+        Math.abs(this.im).toExponential(n) +
+        "i"
+      );
+    else return this.abs.toExponential(n) + " cis " + this.arg.toExponential(n);
+  }
+
+  static getReals(c, d) {
+    // when c or d may be simple or complex
+    var x, y, u, v;
+    if (c instanceof cx) {
+      x = c.re;
+      y = c.im;
+    } else {
+      x = c;
+      y = 0;
+    }
+    if (d instanceof cx) {
+      u = d.re;
+      v = d.im;
+    } else {
+      u = d;
+      v = 0;
+    }
+    return [x, y, u, v];
+  }
+
+  static conj(c) {
+    return new cx(c.re, -c.im);
+  }
+
+  static neg(c) {
+    return new cx(-c.re, -c.im);
+  }
+
+  static add(c, d) {
+    var a = cx.getReals(c, d);
+    var x = a[0];
+    var y = a[1];
+    var u = a[2];
+    var v = a[3];
+    return new cx(x + u, y + v);
+  }
+
+  static sub(c, d) {
+    var a = cx.getReals(c, d);
+    var x = a[0];
+    var y = a[1];
+    var u = a[2];
+    var v = a[3];
+    return new cx(x - u, y - v);
+  }
+
+  static mult(c, d) {
+    var a = cx.getReals(c, d);
+    var x = a[0];
+    var y = a[1];
+    var u = a[2];
+    var v = a[3];
+    return new cx(x * u - y * v, x * v + y * u);
+  }
+
+  static div(c, d) {
+    var a = cx.getReals(c, d);
+    var x = a[0];
+    var y = a[1];
+    var u = a[2];
+    var v = a[3];
+    return new cx(
+      (x * u + y * v) / (u * u + v * v),
+      (y * u - x * v) / (u * u + v * v)
+    );
+  }
+
+  static pow(c, int) {
+    if (Number.isInteger(int) && int >= 0) {
+      var r = Math.pow(c.abs, int);
+      var theta = int * c._arg;
+      return new cx(r * Math.cos(theta), r * Math.sin(theta));
+    } else return NaN;
+  }
+
+  static root(c, int, k) {
+    if (!k) k = 0;
+    if (
+      Number.isInteger(int) &&
+      int >= 2 &&
+      Number.isInteger(k) &&
+      k >= 0 &&
+      k < int
+    ) {
+      var r = Math.pow(c.abs, 1 / int);
+      var theta = (c._arg + 2 * k * Math.PI) / int;
+      return new cx(r * Math.cos(theta), r * Math.sin(theta));
+    } else return NaN;
+  }
+
+  static log(c) {
+    return new cx(Math.log(c.abs), c._arg);
+  }
+
+  static exp(c) {
+    var r = Math.exp(c.re);
+    var theta = c.im;
+    return new cx(r * Math.cos(theta), r * Math.sin(theta));
+  }
+
+  static sin(c) {
+    var a = c.re;
+    var b = c.im;
+    return new cx(Math.sin(a) * Math.cosh(b), Math.cos(a) * Math.sinh(b));
+  }
+
+  static cos(c) {
+    var a = c.re;
+    var b = c.im;
+    return new cx(Math.cos(a) * Math.cosh(b), -Math.sin(a) * Math.sinh(b));
+  }
+
+  static tan(c) {
+    return cx.div(cx.sin(c), cx.cos(c));
+  }
+
+  static asin(c, k) {
+    if (!k) k = 0;
+    var ic = cx.mult(cx.i, c);
+    var c2 = cx.pow(c, 2);
+    return cx.mult(
+      cx.neg(cx.i),
+      cx.log(cx.add(ic, cx.root(cx.sub(1, c2), 2, k)))
+    );
+  }
+
+  static acos(c, k) {
+    if (!k) k = 0;
+    var c2 = cx.pow(c, 2);
+    return cx.mult(
+      cx.neg(cx.i),
+      cx.log(cx.add(c, cx.mult(cx.i, cx.root(cx.sub(1, c2), 2, k))))
+    );
+  }
+
+  static atan(c) {
+    return cx.mult(
+      cx.div(cx.i, 2),
+      cx.log(cx.div(cx.add(cx.i, c), cx.sub(cx.i, c)))
+    );
+  }
+
+  static sinh(c) {
+    var a = c.re;
+    var b = c.im;
+    return new cx(Math.sinh(a) * Math.cos(b), Math.cosh(a) * Math.sin(b));
+  }
+
+  static cosh(c) {
+    var a = c.re;
+    var b = c.im;
+    return new cx(Math.cosh(a) * Math.cos(b), Math.sinh(a) * Math.sin(b));
+  }
+
+  static tanh(c) {
+    return cx.div(cx.sinh(c), cx.cosh(c));
+  }
+
+  static asinh(c, k) {
+    if (!k) k = 0;
+    var c2 = cx.pow(c, 2);
+    return cx.log(cx.add(c, cx.root(cx.add(c2, 1), 2, k)));
+  }
+
+  static acosh(c, k) {
+    if (!k) k = 0;
+    var c2 = cx.pow(c, 2);
+    return cx.log(cx.add(c, cx.root(cx.sub(c2, 1), 2, k)));
+  }
+
+  static atanh(c) {
+    return cx.mult(cx.div(1, 2), cx.log(cx.div(cx.add(1, c), cx.sub(1, c))));
+  }
+
+  static copy(c) {
+    return new cx(c.re, c.im);
+  }
+
+  static eq(c, d, epsilon) {
+    if (!epsilon) {
+      if (c.re == d.re && c.im == d.im) return true;
+    } else {
+      if (Math.abs(c.re - d.re) < epsilon && Math.abs(c.im - d.im) < epsilon)
+        return true;
+    }
+    return false;
+  }
+}
+
+cx.degrees(true); // need to call this
--- a/euler-golf/js/game.js
+++ b/euler-golf/js/game.js
@ -0,0 +1,276 @@
+const DEFAULTS = {
+  max_rows: 80,
+  max_cols: 80,
+  min_gap: 30,
+  angle_multiplier: 10e-4,
+};
+const CANVAS = document.getElementById("canvas");
+
+let state = {
+  grid_padding: 30,
+  canvas: CANVAS,
+  ctx: CANVAS.getContext("2d"),
+  last_render: 0,
+  keys: {},
+  changes: {},
+};
+
+// Rendering
+CanvasRenderingContext2D.prototype.circle = function (x, y, r, color) {
+  this.beginPath();
+  this.arc(x, y, r, 0, Math.PI * 2);
+  this.fillStyle = color;
+  this.fill();
+  this.closePath();
+};
+
+CanvasRenderingContext2D.prototype.line = function (
+  { x_pos: x1, y_pos: y1 },
+  { x_pos: x2, y_pos: y2 },
+  width,
+  color,
+  cap = "round"
+) {
+  this.lineWidth = width;
+  this.strokeStyle = color;
+  this.lineCap = cap;
+
+  this.beginPath();
+  this.moveTo(x1, y1);
+  this.lineTo(x2, y2);
+  this.stroke();
+  this.closePath();
+};
+
+CanvasRenderingContext2D.prototype.draw_cartesian_path = function (
+  grid_spec,
+  cartesian_path,
+  width = 2,
+  color = "#000"
+) {
+  const path = cartesian_path.map((coord) => grid_to_canvas(coord, grid_spec));
+  path.slice(1).forEach((coord, i) => {
+    this.line(path[i], coord, width, color);
+  });
+};
+
+CanvasRenderingContext2D.prototype.do_grid = function (
+  rows,
+  cols,
+  draw_at_grid_pos = (ctx, x, y) => ctx.circle(x, y, 10, "#44ff44")
+) {
+  for (let y = 0; y < rows; y++) {
+    for (let x = 0; x < cols; x++) {
+      draw_at_grid_pos(this, x, y);
+    }
+  }
+};
+
+CanvasRenderingContext2D.prototype.cartesian_grid = function (
+  rows,
+  cols,
+  grid_spec,
+  circle_spec_at_coords = (_x, _y) => ({ radius: 5, color: "#000" })
+) {
+  this.do_grid(rows, cols, (ctx, x, y) => {
+    const { x_pos, y_pos } = grid_to_canvas({ x, y }, grid_spec);
+    const { radius, color } = circle_spec_at_coords(x, y);
+
+    ctx.circle(x_pos, y_pos, radius, color);
+  });
+};
+
+// Utilities
+const move = (prev, curr, c) => cx.add(prev, cx.mult(c, cx.sub(curr, prev)));
+
+const rand_between = (min, max) =>
+  Math.floor(Math.random() * (max - min + 1)) + min;
+
+const rand_target = (rows, cols) => {
+  const r = Math.floor(rows / 2);
+  const c = Math.floor(cols / 2);
+  const res = new cx(rand_between(-c, c), rand_between(-r, r));
+  if (!sol(res)) return rand_target(rows, cols);
+
+  return res;
+};
+
+const calculate_grid_spec = ({ rows, cols, width, height, grid_padding }) => {
+  const dx = (width - 2 * grid_padding) / cols;
+  const dy = (height - 2 * grid_padding) / rows;
+
+  return {
+    dx,
+    dy,
+    start_x: grid_padding + dx / 2,
+    start_y: grid_padding + dy / 2,
+  };
+};
+
+const grid_to_canvas = ({ x, y }, { dx, dy, start_x, start_y }) => ({
+  x_pos: x * dx + start_x,
+  y_pos: y * dy + start_y,
+});
+
+const complex_to_grid = (c, rows, cols) => {
+  const { re, im } = c;
+  return {
+    x: re + Math.floor(cols / 2),
+    y: Math.floor(rows / 2) - im,
+  };
+};
+
+// Game loop
+
+const maybe_add_state_angle_move = ({ angle } = state) => {
+  if (angle.im <= -1 || angle.im >= 1) {
+    angle.im = angle.im <= -1 ? -1 : 1;
+    state.path.push(move(state.path.at(-2), state.path.at(-1), angle));
+    state.angle = new cx(0, 0);
+  }
+  return state;
+};
+
+const handle_input = (state, dt) => {
+  if (state.keys.ArrowLeft) {
+    state.angle.im += DEFAULTS.angle_multiplier * dt;
+  } else if (state.keys.ArrowRight) {
+    state.angle.im -= DEFAULTS.angle_multiplier * dt;
+  }
+  state = maybe_add_state_angle_move(state);
+};
+
+const render = ({ width, height, ctx, rows, cols, target } = state) => {
+  ctx.clearRect(0, 0, width, height);
+  ctx.fillStyle = "rgba(0, 0, 0, 0)";
+  ctx.fillRect(0, 0, width, height);
+
+  const grid_spec = calculate_grid_spec(state);
+
+  const curr = state.path.at(-1);
+  const prev = state.path.at(-2);
+
+  const v_diff = cx.sub(curr, prev);
+  const theta = (state.angle.im * Math.PI) / 2;
+
+  const angle_re = Math.cos(theta) * v_diff.re - Math.sin(theta) * v_diff.im;
+  const angle_im = Math.sin(theta) * v_diff.re + Math.cos(theta) * v_diff.im;
+
+  ctx.draw_cartesian_path(grid_spec, [
+    ...state.path.map((c) => complex_to_grid(c, rows, cols)),
+    complex_to_grid(cx.add(new cx(angle_re, angle_im), prev), rows, cols),
+  ]);
+
+  if (!(state.angle.im == state.angle.re && state.angle.re == 0)) {
+    // Draw path to next player's target
+    const [a, b] = [
+      curr,
+      move(prev, curr, new cx(0, state.angle.im < 0 ? -1 : 1)),
+    ].map((c) => grid_to_canvas(complex_to_grid(c, rows, cols), grid_spec));
+
+    ctx.line(a, b, 6, "#aaa");
+  }
+
+  const grid_target = complex_to_grid(target, rows, cols);
+
+  ctx.cartesian_grid(rows, cols, grid_spec, (x, y) => {
+    if (x == Math.floor(cols / 2) && y == Math.floor(rows / 2)) {
+      return {
+        radius: 7,
+        color: "#2f9c94",
+      };
+    } else if (x == grid_target.x && y == grid_target.y) {
+      return {
+        radius: 8,
+        color: "#00ff00",
+      };
+    } else {
+      return {
+        radius: 3,
+        color: `rgb(${255 * (x / cols)}, 100, 100)`, // todo: animate with last_render
+      };
+    }
+  });
+};
+
+const loop = (now) => {
+  const dt = now - state.last_render;
+  state.changes.last_render = now;
+
+  if (Object.keys(state.changes).length > 0) {
+    if (state.changes.width || state.changes.height) {
+      state.changes.rows = Math.floor(
+        Math.min(DEFAULTS.max_rows, state.changes.height / DEFAULTS.min_gap)
+      );
+      state.changes.cols = Math.floor(
+        Math.min(DEFAULTS.max_cols, state.changes.width / DEFAULTS.min_gap)
+      );
+    }
+
+    state = { ...state, ...state.changes };
+
+    state.changes = {};
+  }
+
+  if (!state.target) {
+    state.target = rand_target(state.rows, state.cols);
+  }
+
+  if (!state.solution) {
+    handle_input(state, dt);
+  } else {
+    if (!state?.solution.length) {
+      delete state.solution;
+    } else {
+      state.angle.im +=
+        (state.solution[0] === "-" ? 1 : -1) * DEFAULTS.angle_multiplier * dt;
+
+      state = maybe_add_state_angle_move(state);
+
+      if (cx.eq(state.angle, new cx(0, 0))) state.solution.shift();
+    }
+  }
+  render(state);
+  requestAnimationFrame(loop);
+};
+
+const reset_state = ({ rows, cols } = state) => ({
+  ...state,
+  solution: null,
+  path: [new cx(0, 0), new cx(1, 0)],
+  angle: new cx(0, 0),
+});
+
+// DOM
+const on_resize = () => {
+  CANVAS.width = document.body.clientWidth;
+  CANVAS.height = document.body.clientHeight;
+  state.changes.width = CANVAS.width;
+  state.changes.height = CANVAS.height;
+};
+
+const on_keyup = (e) => {
+  delete state.keys[e.key];
+};
+
+const on_keydown = (e) => {
+  state.keys[e.key] = true;
+};
+
+window.addEventListener("resize", on_resize);
+window.addEventListener("keydown", on_keydown);
+window.addEventListener("keyup", on_keyup);
+
+// main
+on_resize();
+state = reset_state(state);
+
+if (!sessionStorage.getItem("seen-instructions")) {
+  new Modal({
+    el: document.getElementById("directions-modal"),
+  }).show();
+
+  sessionStorage.setItem("seen-instructions", true);
+}
+
+requestAnimationFrame(loop);
--- a/euler-golf/js/json-ds.js
+++ b/euler-golf/js/json-ds.js
@ -0,0 +1,19 @@
+class JSONSet {
+  items = new Set();
+
+  constructor(initial) {
+    if (Array.isArray(initial)) {
+      initial.map((x) => this.apply_set_function("add", x));
+    } else {
+      this.apply_set_function("add", initial);
+    }
+
+    ["add", "has", "remove"].forEach(
+      (f_name) => (this[f_name] = (x) => this.apply_set_function(f_name, x))
+    );
+  }
+
+  apply_set_function(f_name, x) {
+    return this.items[f_name](JSON.stringify(x));
+  }
+}
--- a/euler-golf/js/modal-vanilla.min.js
+++ b/euler-golf/js/modal-vanilla.min.js
--- a/euler-golf/js/sol.js
+++ b/euler-golf/js/sol.js
@ -0,0 +1,39 @@
+const DEPTH = 15;
+
+const DIRECTION = {
+  0: new cx(0, 1),
+  1: new cx(0, -1),
+};
+
+const construct_moves = (curr, prev) =>
+  Object.keys(DIRECTION).map((x) => move(curr, prev, DIRECTION[x]));
+
+const backtrack = (local_index, depth) =>
+  local_index
+    .toString(2)
+    .padStart(depth, "0")
+    .split("")
+    .map((direction) => (Number(direction) ? "+" : "-"));
+
+const sol = (target, start_from = new cx(0, 0), start_to = new cx(1, 0)) => {
+  let moves = [start_to, ...construct_moves(start_from, start_to)];
+  let curr_depth = 2;
+
+  while (curr_depth < DEPTH) {
+    for (let i = 0; i < Math.pow(2, curr_depth); i++) {
+      const direction = DIRECTION[Number(i.toString(2).at(-1))];
+      // Current element is at i >> 1 + the offset for the previous group (which is
+      // the sum of the geometric series 2**n until curr_depth - 1)
+      const current_i = (i >> 1) + (1 - Math.pow(2, curr_depth - 1)) / (1 - 2);
+      const previous_i = (i >> 2) + (1 - Math.pow(2, curr_depth - 2)) / (1 - 2);
+
+      const new_move = move(moves[previous_i], moves[current_i], direction);
+
+      moves.push(new_move);
+      if (cx.eq(new_move, target)) return backtrack(i, curr_depth);
+    }
+    curr_depth++;
+  }
+
+  return null;
+};
--- a/index.html
+++ b/index.html
@ -3,56 +3,41 @@
 <html>
  <head>
    <title>Simponic's Static Sites</title>
-    <link href="css/styles.css" rel="stylesheet">
+    <link href="css/styles.css" rel="stylesheet" />
    <link
      rel="stylesheet"
      href="https://cdnjs.cloudflare.com/ajax/libs/animate.css/4.1.1/animate.min.css"
    />
-    <script src="https://kit.fontawesome.com/d7e97ed48f.js" crossorigin="anonymous"></script>
+    <script
+      src="https://kit.fontawesome.com/d7e97ed48f.js"
+      crossorigin="anonymous"
+    ></script>

-    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
  </head>
  <body>
    <div class="top-container animate__animated animate__fadeIn">
-      <img src="images/profile.png" class="profile-picture">
+      <img src="images/profile.png" class="profile-picture" />
      <h3>
        👋 Hello, I'm Simponic!
-         <br>
+        <br />
        📖 This page hosts strictly static content.
-         <br>
-         🔔 My "real website" is at <a href="https://simponic.xyz">simponic.xyz</a>.
+        <br />
+        🔔 My "real website" is at
+        <a href="https://simponic.xyz">simponic.xyz</a>.
      </h3>
      <div class="projects-grid">
-        <div class="project" onclick="window.location='dvd-logo/index.html'">
+        <div class="project" onclick="window.location='euler-golf/index.html'">
          <div class="project-logo-container">
-            <i class="fa-solid fa-compact-disc"></i>
+            <i class="fa-solid fa-golf-ball-tee"></i>
          </div>

          <div class="project-body">
-            <h1>DVD Logo Bouncing Animation</h1>
-            <p>Brings back the nostalgia of old-school DVD players with an intersection predictor. The twist: no Canvas API! Only svg's and absolute positioned images!</p>
-          </div>
-        </div>
-
-        <div class="project" onclick="window.location='maize-maze/index.html'">
-          <div class="project-logo-container">
-            <i class="fa-solid fa-diagram-project"></i>
-          </div>
-
-          <div class="project-body" >
-            <h1>The A-maze-ing Maize Maze</h1>
-            <p>A Randomized Kruskal's Maze game with BFS path-finding. You play as a 🌽corn stalk trying to become 🍿popcorn.</p>
-          </div>
-        </div>
-
-        <div class="project" onclick="window.location='centipede/index.html'">
-          <div class="project-logo-container">
-            <i class="fa-solid fa-mosquito"></i>
-          </div>
-
-          <div class="project-body" >
-            <h1>Centipede</h1>
-            <p>In this game, shoot all the centipede bodies and score points and go up levels.</p>
+            <h1>Euler Golf 2</h1>
+            <p>
+              A puzzle game (with solver) to explore rotations in the complex
+              plane.
+            </p>
          </div>
        </div>

@ -63,18 +48,69 @@

          <div class="project-body">
            <h1>Julia Set Explorer</h1>
-            <p>Zoom, pan, and "c" complex changes in this fun GPU-accelerated playground!</p>
+            <p>
+              Zoom, pan, and "c" complex changes in this fun GPU-accelerated
+              playground!
+            </p>
          </div>
        </div>

-        <div class="project" onclick="window.location='ft-visualizer/index.html'">
+        <div
+          class="project"
+          onclick="window.location='ft-visualizer/index.html'"
+        >
          <div class="project-logo-container">
            <i class="fa-solid fa-wave-square"></i>
          </div>

          <div class="project-body">
            <h1>Discrete Fourier Visualizer</h1>
-            <p>Draw how your year has gone and view a reactive graph containing its DFT by dragging your mouse over the canvas!</p>
+            <p>
+              Draw how your year has gone and view a reactive graph containing
+              its DFT by dragging your mouse over the canvas!
+            </p>
+          </div>
+        </div>
+        <div class="project" onclick="window.location='maize-maze/index.html'">
+          <div class="project-logo-container">
+            <i class="fa-solid fa-diagram-project"></i>
+          </div>
+
+          <div class="project-body">
+            <h1>The A-maze-ing Maize Maze</h1>
+            <p>
+              A Randomized Kruskal's Maze game with BFS path-finding. You play
+              as a 🌽corn stalk trying to become 🍿popcorn.
+            </p>
+          </div>
+        </div>
+
+        <div class="project" onclick="window.location='centipede/index.html'">
+          <div class="project-logo-container">
+            <i class="fa-solid fa-mosquito"></i>
+          </div>
+
+          <div class="project-body">
+            <h1>Centipede</h1>
+            <p>
+              In this game, shoot all the centipede bodies and score points and
+              go up levels.
+            </p>
+          </div>
+        </div>
+
+        <div class="project" onclick="window.location='dvd-logo/index.html'">
+          <div class="project-logo-container">
+            <i class="fa-solid fa-compact-disc"></i>
+          </div>
+
+          <div class="project-body">
+            <h1>DVD Logo Bouncing Animation</h1>
+            <p>
+              Brings back the nostalgia of old-school DVD players with an
+              intersection predictor. The twist: no Canvas API! Only svg's and
+              absolute positioned images!
+            </p>
          </div>
        </div>
      </div>