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| <html> | |
| <head> | |
| <title>Connect-4 game</title> | |
| <script src="https://cdn.jsdelivr.net/npm/@tensorflow/tfjs/dist/tf.min.js"></script> | |
| <script src="https://cdn.jsdelivr.net/npm/@tensorflow/tfjs-backend-wasm/dist/tf-backend-wasm.js"></script> | |
| </head> | |
| <body> | |
| <p style="user-select: none; font-family: sans-serif;"> | |
| Try to connect four stones in a row, a column, or a diagonal. | |
| </p> | |
| <p><button type="button" style="user-select: none;" id="ai-first">AI goes first</button></p> | |
| <canvas id="game-board" width="600px" height="600px"></canvas> | |
| <script> | |
| function BoardGame(num_rows, num_cols) { | |
| this.num_cols = num_cols; | |
| this.num_rows = num_rows; | |
| var this_ = this; | |
| this.canvas_ctx = document.getElementById("game-board").getContext("2d"); | |
| this.board_scale = 30; | |
| document.getElementById("game-board").height = this.board_scale * (num_rows + 1); | |
| document.getElementById("game-board").width = this.board_scale * (num_cols + 1); | |
| this.canvas_ctx.scale(this.board_scale, this.board_scale); | |
| this.canvas_ctx.translate(1, 1); | |
| this.reset = function () { | |
| this.board = new Array(num_rows * num_cols); | |
| for (let i = 0; i < this.board.length; i++) this.board[i] = 0; | |
| this.mouse_x = -1; | |
| this.mouse_y = -1; | |
| this.who_play = 1; | |
| this.ai_player = -1; | |
| this.game_ended = false; | |
| }; | |
| this.reset(); | |
| this.render_text = function (text) { | |
| this.canvas_ctx.fillStyle = "black"; | |
| this.canvas_ctx.font = '1px monospace'; | |
| this.canvas_ctx.fillText(text, 1, 1); | |
| }; | |
| this.submit_board = async function (action_) { | |
| const obs = tf.tensor(this_.board, [this_.num_rows, this_.num_cols], 'float32'); | |
| const normalized_obs = tf.mul(obs, this_.ai_player); | |
| normalized_obs.print(); | |
| const [action_logits, value] = this_.agent.predict(normalized_obs); | |
| action_logits.print(); | |
| const action = await tf.argMax(action_logits).array(); | |
| return { | |
| "terminated": false, | |
| "action": action, | |
| }; | |
| }; | |
| this.end_game = function () { | |
| this.game_ended = true; | |
| setTimeout(function() {this_.reset();}, 3000); | |
| }; | |
| this.ai_play = function() { | |
| this_.submit_board().then( | |
| function (info) { | |
| document.body.style.cursor = 'default'; | |
| console.log(info); | |
| let x = info["action"]; | |
| if (x != -1) { | |
| let [_, y] = this_.get_candidate(x); | |
| let i = y * this_.num_cols + x; | |
| this_.board[i] = this_.who_play; | |
| this_.who_play = -this_.who_play; | |
| this_.render(); | |
| } | |
| if (info["terminated"] == true) { | |
| this_.end_game(); | |
| } | |
| } | |
| ).catch(function (e) { }); | |
| }; | |
| document.getElementById("ai-first").onclick = function() { | |
| this_.reset(); | |
| this_.ai_player = 1; | |
| this_.ai_play(); | |
| }; | |
| document.getElementById("game-board").addEventListener('click', function (e) { | |
| var rect = this.getBoundingClientRect(); | |
| var x = e.clientX - rect.left; | |
| var y = e.clientY - rect.top; | |
| var loc_x = Math.floor(x / this_.board_scale - 0.5); | |
| var loc_y = Math.floor(y / this_.board_scale - 0.5); | |
| this_.mouse_x = loc_x; | |
| this_.mouse_y = this_.get_candidate(this_.mouse_x)[1]; | |
| if ( | |
| this_.mouse_x >= 0 && | |
| this_.mouse_y >= 0 && | |
| this_.mouse_x < this_.num_cols && | |
| this_.mouse_y < this_.num_rows && | |
| this_.game_ended == false | |
| ) { | |
| if (this_.who_play == this_.ai_player) return false; | |
| let i = this_.mouse_y * this_.num_cols + this_.mouse_x; | |
| if (this_.board[i] != 0) return false; | |
| this_.board[i] = this_.who_play; | |
| this_.who_play = -this_.who_play; | |
| this_.render(); | |
| this_.ai_play(); | |
| } | |
| }, false); | |
| this.draw_stone = function (x, y, color) { | |
| let ctx = this.canvas_ctx; | |
| y = this.num_rows - 1 - y; | |
| ctx.beginPath(); | |
| ctx.arc(x, y, 0.40, 0, 2 * Math.PI, false); | |
| ctx.fillStyle = color; | |
| ctx.fill(); | |
| ctx.lineWidth = 0.02; | |
| ctx.strokeStyle = "black"; | |
| ctx.stroke(); | |
| }; | |
| this.get_candidate = function (x) { | |
| for (let i = 0; i < this.num_rows; i++) { | |
| let idx = i * this.num_cols + x; | |
| if (this.board[idx] == 0) return [x, i]; | |
| } | |
| return [-1, -1]; | |
| }; | |
| this.render = function () { | |
| let ctx = this.canvas_ctx; | |
| ctx.fillStyle = "#b8891c"; | |
| ctx.fillRect(-1, -1, num_cols + 1, num_rows + 1); | |
| ctx.fillStyle = "#b8891c"; | |
| ctx.fillRect(0, 0, num_cols - 1, num_rows - 1); | |
| ctx.lineWidth = 0.1 / 5; | |
| for (let i = 0; i < this.num_cols; i++) { | |
| ctx.beginPath(); | |
| ctx.moveTo(i, 0); | |
| ctx.lineTo(i, this.num_rows - 1); | |
| ctx.strokeStyle = "black"; | |
| ctx.stroke(); | |
| } | |
| for (let i = 0; i < this.num_rows; i++) { | |
| ctx.beginPath(); | |
| ctx.moveTo(0, i); | |
| ctx.lineTo(this.num_cols - 1, i); | |
| ctx.strokeStyle = "black"; | |
| ctx.stroke(); | |
| } | |
| for (let i = 0; i < this.board.length; i++) { | |
| let x = i % this.num_cols; | |
| let y = Math.floor(i / this.num_cols); | |
| if (this.board[i] == 0) continue; | |
| let color = (this.board[i] == 1) ? "#3a352d" : "#f0ece4"; | |
| this.draw_stone(x, y, color); | |
| } | |
| if ( | |
| this.mouse_x >= 0 && | |
| this.mouse_y >= 0 && | |
| this.mouse_x < this.num_cols && | |
| this.mouse_y < this.num_rows | |
| ) { | |
| let [x, y] = this.get_candidate(this.mouse_x); | |
| if (x == -1) return; | |
| this.mouse_x = x; | |
| this.mouse_y = y; | |
| if (this.who_play == -1) | |
| this.draw_stone(x, y, "#bda051"); | |
| else | |
| this.draw_stone(x, y, "#6d6051"); | |
| } | |
| }; | |
| document.getElementById("game-board").onmousemove = function (e) { | |
| // important: correct mouse position: | |
| var rect = this.getBoundingClientRect(); | |
| var x = e.clientX - rect.left; | |
| var y = e.clientY - rect.top; | |
| var loc_x = Math.floor(x / this_.board_scale - 0.5); | |
| var loc_y = Math.floor(y / this_.board_scale - 0.5); | |
| this_.mouse_x = loc_x; | |
| this_.mouse_y = loc_y; | |
| setTimeout(function () { this_.render(); }); | |
| }; | |
| }; | |
| const modelUrl = 'policy/model.json'; | |
| const init_fn = async function() { | |
| const model = await tf.loadGraphModel(modelUrl); | |
| await tf.setBackend('wasm'); | |
| return model; | |
| }; | |
| document.addEventListener("DOMContentLoaded", function (event) { | |
| init_fn().then(function (agent) { | |
| game = new BoardGame(agent, 6, 7); | |
| game.render(); | |
| }); | |
| }); | |
| </script> | |
| </body> | |
| </html> |