Add life power up

README.md

@@ -9,7 +9,7 @@
   
 - [x] Life
 
-- [ ] Heart item to regain a life
+- [x] Heart item to regain a life
 
 - [x] No wall option
 
@@ -18,3 +18,5 @@
 - [x] Increase speed every 5 points
 
 - [ ] Power up to decrease the snake size
+
+- [x] Pause game when press escape

sources/js/Game.js

@@ -30,6 +30,7 @@ export class Game {
         this.onEat = null;
         this.onDie = null;
         this.onGameOver = null;
+        this.baseLifeCooldown = this.lifeCooldown = 30000;
     }
 
     /**
@@ -127,7 +128,9 @@ export class Game {
     main() {
         try {
             this.moveSnake();
+            this.lifeGenerator();
             this.drawGrid();
+
         } catch (err) {
             if (err instanceof GameOver) {
                 this.lives--;
@@ -164,16 +167,26 @@ export class Game {
                     this.snake.body[i] = [mod_floor(x, this.size[0]), mod_floor(y, this.size[1])];
             else {
                 const t = this.world[x][y];
-                if (t.type === tiles.APPLE) {
+                let haveEat = true;
+                switch (t.type) {
+                    case tiles.APPLE:
                         this.snake.eat();
                         this.appleGenerator();
                         this.score++;
                         if (!(this.score % 5) && this.snakeSpeed > 50) {
                             this.snakeSpeed -= 10;
                         }
-                    if (this.onEat && typeof this.onEat === "function")
-                        this.onEat(this.score);
+                        break;
+                    case tiles.LIFE:
+                        this.lives++;
+                        break;
+                    default:
+                        haveEat = false;
                 }
+
+                if (haveEat && this.onEat && typeof this.onEat === "function")
+                    this.onEat(this.score);
+
                 if (!i)
                     t.type = tiles.HEAD;
                 else if (i === this.snake.body.length-1)
@@ -200,7 +213,7 @@ export class Game {
     }
 
     /**
-     * Main loop fir apple generation
+     * Generate an apple on the world
      */
     appleGenerator() {
         let pos = this.randCoords();
@@ -208,6 +221,24 @@ export class Game {
         this.world[pos[0]][pos[1]].type = tiles.APPLE;
     }
 
+    /**
+     * Handel the live generation
+     */
+    lifeGenerator() {
+        if (!this.world.find(v => v === tiles.LIFE)) {
+            if (this.lifeCooldown <= 0) {
+                if (this.lives < 3 && 0.15 < Math.random()) {
+                    let pos = this.randCoords();
+
+                    this.world[pos[0]][pos[1]].type = tiles.LIFE;
+                    this.lifeCooldown = this.baseLifeCooldown;
+                }
+            } else
+                this.lifeCooldown -= this.snakeSpeed;
+        }
+    }
+
+
     /**
      * Generate random coordinates of empty tiles
      * @returns {[int, int]}

sources/js/Tile.js

@@ -186,6 +186,10 @@ export class Tile {
                     this.game.ctx.setTransform(1, 0, 0, 1, 0, 0);
                 }
                 break;
+            case tiles.LIFE:
+                this.game.ctx.fillStyle = "#e400ff";
+                this.game.ctx.fillRect(...canvasPos, ...size);
+                break;
         }
 
         this.game.ctx.stroke();
@@ -260,5 +264,6 @@ export const tiles = {
     APPLE: "apple",
     HEAD: "head",
     BODY: "body",
-    TAIL: "tail"
+    TAIL: "tail",
+    LIFE: "life"
 };

sources/js/index.js

@@ -62,6 +62,7 @@ game.onStop = () => {
 game.onEat = (score) => {
     eatSound.play();
     updateScore(score);
+    updateLives(game.lives);
 };
 
 game.onDie = lives => {