js canvas realizes circular water animation

This article example shares the specific code of canvas to realize circular water animation for your reference. The specific content is as follows

Preface

Special effects display

Effect display

Code Showcase

index.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <!-- <link rel="stylesheet" href="style.css" > -->
</head>
<body>
    <script src="main.js"></script>
</body>
</html>

main.js

/*
 * Noel Delgado - @pixelia_me
 */

(function() {
  var ctx, w, h, cx, cy, PI, PI_HALF, cos, sin, random, lineWidth, C, 
      rings, ringsLength, data;

  ctx = document.createElement('canvas').getContext('2d');
  w = 600;
  h = 600;
  cx = (w / 2);
  cy = (h / 2);
  rings = [];
  ringsLength = 0;
  
  PI = Math.PI;
  PI_HALF = PI / 2;
  cos = Math.cos;
  sin = Math.sin;
  random = Math.random;

  lineWidth = 0.2;
  C = ["#ABF8FF", "#E76B76", "#1D2439", "#4F3762", "#67F9FF", "#0C0F18"];
  
  data = [
    /* ring {t:total_particles, r:radius, d:distance, s:speed, c:color} */
    [
      {t:80, r:(cx-10), d:40, s:30, c:C[1]},
      {t:60, r:(cx-20), d:40, s:80, c:C[2]},
      {t:20, r:(cx-30), d:20, s:80, c:C[2]},
    ],
    [
     {t:80, r:(cx-80), d:40, s:40, c:C[4]},
       {t:80, r:(cx-90), d:20, s:40, c:C[4]},
       {t:20, r:(cx-100), d:20, s:40, c:C[2]},
       {t:40, r:(cx-110), d:20, s:40, c:C[2]},
    ],
    [
     {t:60, r:(cx-160), d:40, s:20, c:C[2]},
       {t:20, r:(cx-170), d:30, s:60, c:C[2]},
       {t:40, r:(cx-180), d:40, s:60, c:C[2]},
    ],
    [
     {t:40, r:(cx-230), d:40, s:20, c:C[5]},
       {t:20, r:(cx-240), d:20, s:10, c:C[5]},
    ],
    [
       {t:10, r:(cx-290), d:10, s:10, c:C[4]}
    ]
  ];
 
  /* */
  ctx.canvas.width = w;
  ctx.canvas.height = h;
  document.body.appendChild(ctx.canvas);

  data.forEach(function(group) {
    var ring = [];
    
    group.forEach(function(orbit, i) {
      var total_particles, index;
      
      total_particles = orbit.t;
      index = 0;
      
      for (; index < total_particles; index++) {
        var radius, distance, speed, color, opacity;

        radius = orbit.r;
        distance = orbit.d;
        speed = random() / orbit.s;
        speed = i % 2 ? speed : speed * -1;
        color = orbit.c;
        opacity = orbit.o;

        ring.push(new P(radius, distance, speed, color, opacity));

        radius = distance = speed = color = opacity = null;
      }
    });
    
    rings.push(ring);
  });

  ringsLength = rings.length;
 
  /* */
  function P(radius, distance, speed, color) {
    this.a = PI / 180;
    this.d = distance;
    this.d2 = (this.d * this.d);
    this.x = cx + radius * cos(this.a);
    this.y = cy + radius * sin(this.a);
    this.c = color;
    this.r = (random() * 8);
    this.R = random() > 0.5 ? radius : radius - 5;
    this.s = speed;
    this.pos = random() * 360;
  }
  
  function draw() {
    var i, j, k, xd, yd, d, ring, ringLength, ringLength2, particle, p2;

    ctx.beginPath();
    ctx.globalCompositeOperation = "source-over";
    ctx.rect(0, 0 , w, h);
    ctx.fillStyle = "#151a28";
    ctx.fill();
    ctx.closePath();

    for (i = 0; i < ringsLength; i++) {
      ring = rings[i];
      ringLength = ring.length;
      ringLength2 = ringLength - 100;
      
      for (j = 0; j < ringLength; j++) {
        particle = ring[j];

        particle.x = cx + particle.R * sin(PI_HALF + particle.pos);
        particle.y = cy + particle.R * cos(PI_HALF + particle.pos);
        particle.pos += particle.s;

        ctx.beginPath();
        ctx.globalAlpha = 0.12;
        ctx.globalCompositeOperation = "lighter";
        ctx.fillStyle = particle.c;
        ctx.arc(particle.x, particle.y, particle.r, PI * 2, false);
        ctx.fill();
        ctx.closePath();

        for (k = 0; k < ringLength2; k++) {
          p2 = ring[k];

          yd = p2.y - particle.y;
          xd = p2.x - particle.x;
          d = ((xd * xd) + (yd * yd));

          if (d < particle.d2) {
            ctx.beginPath();
            ctx.globalAlpha = 1;
            ctx.lineWidth = lineWidth;
            ctx.moveTo(particle.x, particle.y);
            ctx.lineTo(p2.x, p2.y);
            ctx.strokeStyle = p2.c;
            ctx.stroke();
            ctx.closePath();
          }
        }
      }
    }
  }

  function loop() {
    draw();
    requestAnimationFrame(loop);
  }

  loop();
  
})();

The above is the full content of this article. I hope it will be helpful for everyone’s study. I also hope that everyone will support 123WORDPRESS.COM.

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