From ff2ae6d3ff6c2cab4b0a65675d77715e042ea9bc Mon Sep 17 00:00:00 2001
From: Siri Chandana <chandanasiri004@gmail.com>
Date: Fri, 22 May 2026 16:08:16 +0530
Subject: [PATCH] Add pause/resume functionality to snake game

---
 web-app/js/projects.js       |  39 +++--------
 web-app/js/projects/snake.js | 124 +++++++++++++++++++++++++----------
 2 files changed, 99 insertions(+), 64 deletions(-)

diff --git a/web-app/js/projects.js b/web-app/js/projects.js
index aa047af..6820007 100644
--- a/web-app/js/projects.js
+++ b/web-app/js/projects.js
@@ -1,4 +1,4 @@
-// Project Registry
+// Project Registry
 // Each project's HTML and logic lives in its own file under js/projects/
 
 //To Prevent duplicate intialisation
@@ -6,40 +6,12 @@ let activeProject=null;
 
 function getProjectHTML(projectName) {
     const projects = {
-        'rock-paper-scissor': getRockPaperScissorHTML(),
-        'dice-rolling': getDiceRollingHTML(),
-        'coin-flip': getCoinFlipHTML(),
-        'number-guessing': getNumberGuessingHTML(),
-        'hangman': getHangmanHTML(),
-        'flames': getFlamesHTML(),
-        'emoji-memory': getEmojiMemoryGameHTML(),
-        'fibonacci': getFibonacciHTML(),
-        'progression-recognizer': getProgressionRecognizerHTML(),
-        'pascal-triangle': getPascalTriangleHTML(),
-        'armstrong': getArmstrongHTML(),
-        'calculator': getCalculatorHTML(),
-        'collatz': getCollatzHTML(),
-        'prime-analyzer': getPrimeAnalyzerHTML(),
-        'projectile-motion': getProjectileMotionHTML(),
-        'coordinate-polar-transform': getCoordinatePolarTransformHTML(),
-        'derivative-calculator': getDerivativeCalculatorHTML(),
-        'morse-code': getMorseCodeHTML(),
-        'tower-of-hanoi': getTowerOfHanoiHTML(),
-        'number-converter': getNumberConverterHTML(),
-        'typing-speed-tester': getTypingSpeedTesterHTML(),
-        'snake-game': getsnakeGameHTML(),
-        'password-forge': getPasswordForgeHTML(),
-        'whack-a-mole': getWhackaMoleHTML(),
-        'tic-tac-toe': () => getTicTacToeHTML(),
         'rock-paper-scissor': () => getRockPaperScissorHTML(),
         'dice-rolling': () => getDiceRollingHTML(),
         'coin-flip': () => getCoinFlipHTML(),
-        'Blackjack-21': () => getBlackjackHTML(),
         'number-guessing': () => getNumberGuessingHTML(),
         'hangman': () => getHangmanHTML(),
-        'word-scramble': () => getWordScrambleHTML(),
         'flames': () => getFlamesHTML(),
-        'dots-boxes': () => getDotsBoxesHTML(),
         'emoji-memory': () => getEmojiMemoryGameHTML(),
         'fibonacci': () => getFibonacciHTML(),
         'progression-recognizer': () => getProgressionRecognizerHTML(),
@@ -57,13 +29,17 @@ function getProjectHTML(projectName) {
         'typing-speed-tester': () => getTypingSpeedTesterHTML(),
         'snake-game': () => getSnakeGameHTML(),
         'password-forge': () => getPasswordForgeHTML(),
-        'math-quiz': () => getMathQuizHTML(),
         'whack-a-mole': () => getWhackaMoleHTML(),
+        'tic-tac-toe': () => getTicTacToeHTML(),
+        'blackjack-21': () => getBlackjackHTML(),
+        'word-scramble': () => getWordScrambleHTML(),
+        'dots-boxes': () => getDotsBoxesHTML(),
+        'math-quiz': () => getMathQuizHTML(),
         'simon-says': () => getSimonSaysHTML(),
         'spot-the-difference': () => getSpotTheDifferenceHTML(),
         'flappy-game': () => getFlappyGameHTML(),
         '2048-game': () => get2048GameHTML(),
-        "productive-pet": () => getProductivePetHTML(),
+        'productive-pet': () => getProductivePetHTML(),
         'color-palette': () => getColorPaletteHTML(),
     };
 
@@ -1982,6 +1958,7 @@ function initFlames() {
         gameActive = true;
         instructionsDiv.textContent = "Watch the sequence...";
         startNewRound();
+    });
     
     calculateBtn.addEventListener('click', calculateFlames);
     name1Input.addEventListener('keypress', (e) => {
diff --git a/web-app/js/projects/snake.js b/web-app/js/projects/snake.js
index fb4a23d..deef454 100644
--- a/web-app/js/projects/snake.js
+++ b/web-app/js/projects/snake.js
@@ -17,6 +17,9 @@ function getSnakeGameHTML() {
                 <div class="game-area">
                     <div id="canvas-wrapper" class="ui-canvas-frame">
                         <canvas id="snakeCanvas" width="600" height="400"></canvas>
+                        <div id="pause-overlay" class="hidden">
+                            <h1>⏸ PAUSED</h1>
+                        </div>
                         
                         <div id="game-over-overlay" class="hidden">
                             <h1>GAME OVER!!</h1>
@@ -39,6 +42,7 @@ function getSnakeGameHTML() {
 
                 <div class="button-group">
                     <button id="startGameBtn" class="btn-primary">Start Game</button>
+                    <button id="pauseGameBtn" class="btn-primary">Pause</button>
                     <button id="restartSnakeBtn" class="btn-primary">Restart Game</button>
                 </div>
                 <div class="instruction-box">
@@ -171,6 +175,23 @@ function getSnakeGameHTML() {
                 padding: 12px 25px;
                 cursor: pointer;
             }
+                #pause-overlay {
+    position: absolute;
+    top: 0;
+    left: 0;
+    width: 100%;
+    height: 100%;
+    background: rgba(0,0,0,0.6);
+    display: flex;
+    justify-content: center;
+    align-items: center;
+    z-index: 9;
+    color: white;
+}
+
+#pause-overlay h1 {
+    font-size: 3rem;
+}
         </style>
     `;
 }
@@ -181,26 +202,29 @@ let speed = 9; // System baseline operational configuration state
 let scoreMultiplier = 2; // Baseline multiplier scalar state
 let score = 0;
 let lastPaintTime = 0;
+let isPaused = false;
 let snakeArr = [{ x: 13, y: 10 }];
 let food = { x: 6, y: 7 };
 
 // Profile configuration mapping matrices
 const CONFIG_DIFFICULTY = {
-    easy:   { speed: 5,  multiplier: 1 },
-    medium: { speed: 9,  multiplier: 2 },
-    hard:   { speed: 14, multiplier: 3 }
+    easy: { speed: 5, multiplier: 1 },
+    medium: { speed: 9, multiplier: 2 },
+    hard: { speed: 14, multiplier: 3 }
 };
 
 function main(ctime) {
     const canvas = document.getElementById('snakeCanvas');
     if (!canvas) return; // Exit loop if the game modal has been closed
-    
+
     window.requestAnimationFrame(main);
     if ((ctime - lastPaintTime) / 1000 < 1 / speed) {
         return;
     }
     lastPaintTime = ctime;
-    gameEngine();
+    if (!isPaused) {
+        gameEngine();
+    }
 }
 
 function isCollide(snake) {
@@ -244,10 +268,10 @@ function gameEngine() {
         direction = { x: 0, y: 0 };
         document.getElementById('final-score').innerHTML = score;
         document.getElementById('game-over-overlay').classList.remove('hidden');
-        
+
         // Execute persistent local evaluations
         checkAndSaveHighScore();
-        
+
         // Restore controls visibility states
         const selector = document.getElementById('difficultySelect');
         if (selector) selector.disabled = false;
@@ -297,44 +321,73 @@ function restartGame() {
     direction = { x: 1, y: 0 };
     snakeArr = [{ x: 13, y: 10 }];
     score = 0;
+    isPaused = false;
+
+    const pauseOverlay = document.getElementById('pause-overlay');
+    if (pauseOverlay) {
+        pauseOverlay.classList.add('hidden');
+    }
+
+    const pauseBtn = document.getElementById('pauseGameBtn');
+    if (pauseBtn) {
+        pauseBtn.textContent = 'Pause';
+    }
     document.getElementById('score').innerHTML = score;
     food = { x: 6, y: 7 };
+
+}
+function togglePause() {
+    const pauseOverlay = document.getElementById('pause-overlay');
+    const pauseBtn = document.getElementById('pauseGameBtn');
+
+    // Don't pause before game starts
+    if (direction.x === 0 && direction.y === 0) return;
+
+    isPaused = !isPaused;
+
+    if (isPaused) {
+        pauseOverlay.classList.remove('hidden');
+        pauseBtn.textContent = 'Resume';
+    } else {
+        pauseOverlay.classList.add('hidden');
+        pauseBtn.textContent = 'Pause';
+    }
 }
 
 // Initialize execution listeners
 function initSnakeGame() {
     window.requestAnimationFrame(main);
-    
+
     // Set initial historic rendering metrics
     updateBestScoreUI();
     function restartGame() {
-    // Hide game over overlay
-    document.getElementById('game-over-overlay').classList.add('hidden');
+        // Hide game over overlay
+        document.getElementById('game-over-overlay').classList.add('hidden');
 
-    // Reset snake
-    snakeArr = [{ x: 13, y: 10 }];
+        // Reset snake
+        snakeArr = [{ x: 13, y: 10 }];
 
-    // Reset score
-    score = 0;
-    document.getElementById('score').innerHTML = score;
+        // Reset score
+        score = 0;
+        document.getElementById('score').innerHTML = score;
 
-    // Reset direction and start moving
-    direction = { x: 1, y: 0 };
+        // Reset direction and start moving
+        direction = { x: 1, y: 0 };
 
-    // Generate new food
-    food = {
-        x: Math.round(2 + (16 - 2) * Math.random()),
-        y: Math.round(2 + (16 - 2) * Math.random())
-    };
+        // Generate new food
+        food = {
+            x: Math.round(2 + (16 - 2) * Math.random()),
+            y: Math.round(2 + (16 - 2) * Math.random())
+        };
 
-    // Re-enable difficulty selection before start
-    if (selector) {
-        selector.disabled = true;
-    }
+        // Re-enable difficulty selection before start
+        if (selector) {
+            selector.disabled = true;
+        }
 
-    // Reset frame timing
-    lastPaintTime = 0;
-}
+        // Reset frame timing
+        lastPaintTime = 0;
+    }
 
     // Map difficulty listener parameters
     const selector = document.getElementById('difficultySelect');
@@ -353,7 +406,7 @@ function initSnakeGame() {
     });
 
     document.getElementById('restartSnakeBtn').addEventListener('click', restartGame);
-
+    document.getElementById('pauseGameBtn').addEventListener('click', togglePause);
     document.getElementById('overlayRestartBtn').addEventListener('click', restartGame);
 
     window.addEventListener('keydown', e => {
@@ -363,7 +416,12 @@ function initSnakeGame() {
                 selector.disabled = true;
             }
         }
-
+        if (e.code === 'Space' || e.key.toLowerCase() === 'p') {
+            e.preventDefault();
+            togglePause();
+            return;
+        }
+        if (isPaused) return;
         switch (e.key) {
             case "ArrowUp": if (direction.y !== 1) { direction.x = 0; direction.y = -1; } break;
             case "ArrowDown": if (direction.y !== -1) { direction.x = 0; direction.y = 1; } break;
@@ -386,10 +444,10 @@ function initSnakeGame() {
             e.preventDefault();
             let touchEndX = e.changedTouches[0].screenX;
             let touchEndY = e.changedTouches[0].screenY;
-            
+
             let dx = touchEndX - touchStartX;
             let dy = touchEndY - touchStartY;
-            
+
             if (Math.abs(dx) > Math.abs(dy)) {
                 if (dx > 30 && direction.x !== -1) { direction.x = 1; direction.y = 0; }
                 else if (dx < -30 && direction.x !== 1) { direction.x = -1; direction.y = 0; }