HTML5 Game - Canvas Animation Easing

Description

Easing
Demo

<!doctype html>  
   <html>  
    <head>  
     <style>canvas{border:1px solid red;}</style>  
 </head>  //from  ww  w  .j a  va2s.c om
 <body>  
  <canvas id="canvas" width="400" height="400"></canvas>  
  <script>  
  class Ball {  
constructor(radius) {
     if (radius === undefined) { radius = 40; }  
       
     this.x = 0;  
     this.y = 0;  
     this.radius = radius;  
     this.vx = 0;  
     this.vy = 0;  
     this.rotation = 0;  
     this.scaleX = 1;  
     this.scaleY = 1;  
     this.color = "#ff0000";
     this.lineWidth = 1;  
   }  
     
   draw(context) {  
     context.save();  
     context.translate(this.x, this.y);  
     context.rotate(this.rotation);  
     context.scale(this.scaleX, this.scaleY);  
     context.lineWidth = this.lineWidth;  
     context.fillStyle = this.color;  
     context.beginPath();  
     context.arc(0, 0, this.radius, 0, (Math.PI * 2), true);  
     context.closePath();  
  context.fill();  
  if (this.lineWidth > 0) {  
    context.stroke();  
  }  
  context.restore();  
}
getBounds() {  
  return {  
    x: this.x - this.radius,  
    y: this.y - this.radius,  
    width: this.radius * 2,  
    height: this.radius * 2  
  };  
}

}
  window.onload = function () {  
    let canvas = document.getElementById('canvas'),  
        context = canvas.getContext('2d'),  
        ball = new Ball(),  
        easing = 0.05,  
        targetX = canvas.width / 2,  
        targetY = canvas.height / 2;  
  
    (function drawFrame () {  
      window.requestAnimationFrame(drawFrame, canvas);  
      context.clearRect(0, 0, canvas.width, canvas.height);  
  
      let vx = (targetX - ball.x) * easing,  
          vy = (targetY - ball.y) * easing;  
  
      ball.x += vx;  
      ball.y += vy;  
      ball.draw(context);  
    }());  
  };  
  </script>  
 </body>  
</html>
HTML5 Game - Canvas Animation Easing

Description

Demo

Related Topic
