HTML5 Game - Canvas Animation Fountain partical

Description

Fountain partical
Demo

<!doctype html>  
    <html>  
     <head>  
      <meta charset="utf-8">  
      <title>Fountain</title>  
      <style>canvas{border:1px solid red;}</style>  
     </head>  
     <body>  
     <canvas id="canvas" width="400" height="400"></canvas>  
     <script>  
class Ball {  //w  w  w .  j  a va 2 s.  co m
 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();  
  context.stroke();  
  context.restore();  
}
}
     window.onload = function () {  
       let canvas = document.getElementById('canvas'),  
           context = canvas.getContext('2d'),  
           balls = [],  
           numBalls = 80,  
           gravity = 0.5;  
     
       for (let ball, i = 0; i < numBalls; i++) {  
         ball = new Ball(2);  
         ball.x  = canvas.width / 2;  
         ball.y  = canvas.height;  
         ball.vx = Math.random() * 2 - 1;  
         ball.vy = Math.random() * -10 - 10;  
         balls.push(ball);  
       }  
     
       function draw (ball) {  
         ball.vy += gravity;  
         ball.x += ball.vx;  
         ball.y += ball.vy;  
         if (ball.x - ball.radius > canvas.width ||  
             ball.x + ball.radius < 0 ||  
             ball.y - ball.radius > canvas.height ||  
             ball.y + ball.radius < 0) {  
           ball.x = canvas.width / 2;  
           ball.y = canvas.height;  
           ball.vx = Math.random() * 2 - 1;  
           ball.vy = Math.random() * -10 - 10;  
         }  
         ball.draw(context);  
       }  
     
       (function drawFrame () {  
         window.requestAnimationFrame(drawFrame, canvas);  
         context.clearRect(0, 0, canvas.width, canvas.height);  
     
         balls.forEach(draw);  
       }());  
     };  
     </script>  
    </body>  
   </html>
HTML5 Game - Canvas Animation Fountain partical

Description

Demo

Related Topics
