Started to move box laterally

src/box.js

@@ -4,45 +4,47 @@ const G = 500;
 
 class Box {
     constructor() {
-        this.position = 0;
-        this.speed = 0;
-        this.size = 100;
+        // All these values are in percentage of the screen
+        this.x = 0.5;
+        this.y = 0;
+
+        this.speedX = 0;
+        this.speedY = 0;
+
+        this.size = 0.1;
         this.jumpCounter = MAX_JUMP;
     }
 
-    drawOn(canvas) {
-        let ctx = canvas.getContext('2d');
-
-        ctx.fillStyle = 'rgb(0, 0, 0)';
-        ctx.beginPath();
-        ctx.rect(
-            canvas.width / 2.0 - this.size / 2.0,
-            canvas.height - this.size - this.position,
-            this.size,
-            this.size
-        );
-
-        ctx.fill();
-
-    }
-
     update(time = 0.002) {
-        this.speed -= G * time;
-        this.speed = Math.max(this.speed, -MAX_SPEED);
-        this.position += this.speed;
+        this.speedX *= 0.95;
 
-        if (this.position <= 0) {
-            this.position = 0;
-            this.speed = 0;
+        this.speedY -= G * time;
+        this.speedY = Math.max(this.speedY, -MAX_SPEED);
+
+
+        this.x += this.speedX * time;
+        this.y += this.speedY * time;
+
+        if (this.y <= 0) {
+            this.y = 0;
+            this.speedY = 0;
             this.jumpCounter = MAX_JUMP;
         }
 
+        this.x = Math.max(0, Math.min(1, this.x));
+
     }
 
-    jump() {
+    jump(_x, _y) {
+        // Put x between -1 and 1
+        let x = (_x - 0.5) * 2;
+        let y = _y;
+
         if (this.jumpCounter > 0) {
             this.jumpCounter--;
-            this.speed = MAX_SPEED;
+            this.speedX = MAX_SPEED * x;
+            this.speedY = MAX_SPEED;
         }
+
     }
 }

src/main.js

@@ -13,7 +13,10 @@ function init() {
 
     // Initialize listeners
     window.addEventListener('resize', () => scene.autoResize());
-    document.addEventListener('touchstart', () => box.jump());
+    document.addEventListener('touchstart', (event) => {
+        let e = event.changedTouches[0];
+        box.jump(e.clientX / window.innerWidth, e.clientY / window.innerHeight);
+    });
 
 }
 

src/scene.js

@@ -49,7 +49,24 @@ class Scene {
         this.drawBackground();
 
         for (let object of this.objects) {
-            object.drawOn(this.canvas);
+            this.draw(object);
+            // object.drawOn(this.canvas);
         }
     }
+
+    draw(object) {
+        let size = object.size * this.width();
+
+        this.context.fillStyle = 'rgb(0, 0, 0)';
+        this.context.beginPath();
+
+        this.context.rect(
+            object.x * this.width(),
+            (1 - object.y) * this.height() - size,
+            size,
+            size,
+        );
+        this.context.fill();
+    }
+
 }