js实现canvas可交互点击的液体水流融合动画模拟效果代码-html代码-BFW代码库

代码语言：html

所属分类：动画

代码描述：js实现canvas可交互点击的液体水流融合动画模拟效果代码

下面为部分代码预览，完整代码请点击下载或在bfwstudio webide中打开

<!DOCTYPE html>
<html lang="en">

<head>

    <meta charset="UTF-8">






    <style>
        *{
          margin: 0;
          padding: 0;
          overflow:hidden;
        }
        
        body {
         background:#333; 
        }
        
        #reset {
          position: absolute;
          left:50%;
          top:10px;
          margin-left:-400px;
          background: #444;
          border: 1px solid #555;
          color: #888;
          padding: 6px 10px;
          cursor: pointer;
          opacity: 0.8;
        }
        
        #c {
          width:800px;
          height:376px;
          margin:0 auto;
          display:block;
        }
        
        #info {
          position:absolute;
          left:-1px;
          top:-1px;
          width:auto;
          max-width:380px;
          height:auto;
          background:#f2f2f2;
          border-bottom-right-radius:10px;
        }
        
        #top {
          background:#fff;
          width:100%;
          height:auto;
          position:relative;
          border-bottom:1px solid #eee;
        }
        
        p {
          font-family:Arial, sans-serif;
          color:#666;
          text-align:justify;
          font-size: 16px;
          margin:10px;
        }
        
        a {
          font-family:sans-serif;
          color:#444;
          text-decoration:none;
          font-size: 20px;
        }
        
        #site {
          float:left;
          margin: 10px;
          color: #38a;
        }
        
        #close {
          float:right;
          margin: 10px;
        }
    </style>



</head>

<body>
    <canvas id="c"> </canvas>
    <button id="reset">new colours</button>
    <div id="info">
        <div id="top">
            <a id="close" href="">close</a>
        </div>
        <p>
            <br> - Alter particles/groups with the GROUPS variable.<br><br> - Customize colours with GROUP_COLOURS.<br><br> - Use the mouse to move the fluid.<br><br> - Click anywhere to make water.<br><br> - Use one group for a more water-like effect.<br><br>
        </p>
    </div>


    <script>
  
        
        document.getElementById('close').onmousedown = function (e) {
          e.preventDefault();
          document.getElementById('info').style.display = 'none';
          return false;
        };
        
        /* Settings */
        
        var MOUSE_INFLUENCE = 5,
        GRAVITY_X = 0,
        GRAVITY_Y = 0,
        MOUSE_REPEL = false,
        GROUPS = [50, 50, 50],
        GROUP_COLOURS = ['rgba(97,160,232'];
        
        window.requestAnimFrame =
        window.requestAnimationFrame ||
        window.webkitRequestAnimationFrame ||
        window.mozRequestAnimationFrame ||
        window.oRequestAnimationFrame ||
        window.msRequestAnimationFrame ||
        function (callback) {
          window.setTimeout(callback, 1000 / 60);
        };
        
        var fluid = function () {
        
          var ctx,width,height,num_x,num_y,particles,grid,meta_ctx,threshold = 220,play = false,spacing = 45,radius = 30,limit = radius * 0.66,textures,num_particles;
        
          var mouse = {
            down: false,
            x: 0,
            y: 0 };
        
        
          var process_image = function () {
            var imageData = meta_ctx.getImageData(0, 0, width, height),
            pix = imageData.data;
        
            for (var i = 0, n = pix.length; i < n; i += 4) {
              pix[i + 3] < threshold && (pix[i + 3] /= 6);
            }
        
            ctx.putImageData(imageData, 0, 0);
          };
        
          var run = function () {
        
            //var time = new Date().getTime();
            meta_ctx.clearRect(0, 0, width, height);
        
            for (var i = 0, l = num_x * num_y; i < l; i++) grid[i].length = 0;
        
        
            var i = num_particles;
            while (i--) particles[i].first_process();
            i = num_particles;
            while (i--) particles[i].second_process();
        
            process_image();
        
            if (mouse.down) {
        
              ctx.canvas.style.cursor = 'none';
        
              ctx.fillStyle = 'rgba(97, 160, 232, 0.05)';
              ctx.beginPath();
              ctx.arc(
              mouse.x,
              mouse.y,
              radius * MOUSE_INFLUENCE,
              0,
              Math.PI * 2);
        
              ctx.closePath();
              ctx.fill();
        
              ctx.fillStyle = 'rgba(97, 160, 232, 0.05)';
              ctx.beginPath();
              ctx.arc(
              mouse.x,
              mouse.y,
              radius * MOUSE_INFLUENCE / 3,
              0,
              Math.PI * 2);
        
              ctx.closePath();
              ctx.fill();
            } else ctx.canvas.style.cursor = 'default';
        
            //console.log(new Date().getTime() - time);
        
            if (play)
            requestAnimFrame(run);
          };
        
          var Particle = function (type, x, y) {
            this.type = type;
            this.x = x;
            this.y = y;
            this.px = x;
            this.py = y;
            this.vx = 0;
            this.vy = 0;
          };
        
          Particle.prototype.first_process = function () {
        
            var g = grid[Math.round(this.y / spacing) * num_x + Math.round(this.x / spacing)];
        
            if (g) g.close[g.length++] = this;
        
            this.vx = this.x - this.px;
            this.vy = this.y - this.py;
        
            if (mouse.down) {
              var dist_x = this.x - mouse.x;
              var dist_y = this.y - mouse.y;
              var dist = Math.sqrt(dist_x * dist_x + dist_y * dist_y);
              if (dist < radius * MOUSE_INFLUENCE) {
                var cos = dist_x / dist;
                var sin = dist_y / dist;
                this.vx += MOUSE_REPEL ? cos : -cos;
                this.vy += MOUSE_REPEL ? sin : -sin;
              }
            }
        
  .........完整代码请登录后点击上方下载按钮下载查看