canvas画图加粒子动画

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html

css

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html

css

html,
  body {
    width: 100%;
    height: 100%;
    margin: 0;
    overflow: hidden;
    background: black;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen,
    Ubuntu, Cantarell, "Fira Sans", "Droid Sans", "Helvetica Neue", sans-serif;
    font-size: 14px;
    color: #fff;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    -webkit-user-select: none;
       -moz-user-select: none;
        -ms-user-select: none;
            user-select: none;
    -webkit-tap-highlight-color: transparent;
  }

canvas {
    position: fixed;
    width: 100%;
    height: 100%;
  }

footer {
    position: fixed;
    right: 0;
    top: 0;
    right: 0;
    padding: 10px 10px;
    text-align: right;
    width: 240px;
  }

a {
    display: inline-block;
    margin-left: 2px;
    padding: 2px 4px;
    color: rgba(52, 52, 54, 1);
    text-decoration: none;
    background-color: #fcd000;
    border-radius: 4px;
    opacity: 1;
    -webkit-transition: opacity 0.2s;
    transition: opacity 0.2s;
  }

img {
    width: 300px;
    max-width: 30%;
    position: fixed;
    -webkit-transform: translate3d(0%, -50%, 0px);
            transform: translate3d(0%, -50%, 0px);
    top: 50%;
    left: 50%;
    pointer-events: none;
  }

section {
    -webkit-transition: 0.4s ease;
    transition: 0.4s ease;
    opacity: 0;
    visibility: hidden;
    will-change: opacity, visibility;
    position: fixed;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
  }

button {
    -webkit-appearance: none;
    padding: 12px 24px;
    border-radius: 0;
    position: fixed;
    left: 50%;
    bottom: 24px;
    -webkit-transform: translateX(-50%);
            transform: translateX(-50%);
    text-transform: uppercase;
    letter-spacing: 2px;
    color: white;
    background: black;
    border: 1px solid white;
    cursor: none;
  }

.output button {
    cursor: pointer;
  }

button:focus,
  button:hover {
    color: black;
    background: white;
  }

.input {
    cursor: none;
    opacity: 1;
    visibility: visible;
  }

JavaScript

'use strict';

var segments = [];
var points = [];

var input = document.querySelector('.input');
var output = document.querySelector('.output');

// Input
{
  (function () {
    var canvas = input.querySelector('canvas');
    var image = input.querySelector('img');

var context = canvas.getContext('2d');
    canvas.width = canvas.clientWidth * window.devicePixelRatio;
    canvas.height = canvas.clientHeight * window.devicePixelRatio;

context.lineWidth = window.devicePixelRatio === 1 ? 1 : 3;
    context.strokeStyle = '#FEFEFE';

var current = [];
    var hold = false;

var midPointBtw = function midPointBtw(p1, p2) {
      return {
        x: p1.x + (p2.x - p1.x) / 2,
        y: p1.y + (p2.y - p1.y) / 2
      };
    };

var getCoordinatesFromEvent = function getCoordinatesFromEvent(event) {
      var touch = typeof event.changedTouches !== 'undefined';
      return {
        x: touch ? event.changedTouches[0].clientX : event.clientX,
        y: touch ? event.changedTouches[0].clientY : event.clientY
      };
    };

var start = function start(event) {
      var coords = getCoordinatesFromEvent(event);
      hold = true;
      current = [{
        x: coords.x * window.devicePixelRatio,
        y: coords.y * window.devicePixelRatio
      }];
    };

var move = function move(event) {
      var coords = getCoordinatesFromEvent(event);
      image.style.left = '0px';
      image.style.top = '0px';
      image.style.transform = 'translate3d(' + coords.x + 'px, ' + coords.y + 'px, 0)';
      if (hold) drawSegments(event);
    };

var end = function end() {
      hold = false;
      segments.push(current);
    };

canvas.addEventListener('mousedown', start);
    canvas.addEventListener('touchstart', start);

input.addEventListener('mousemove', move);
    input.addEventListener('touchmove', move);

canvas.addEventListener('mouseup', end);
    canvas.addEventListener('touchend', end);
  })();
}

// Output
{
  (function () {
    var canvas = output.querySelector('canvas');

var initialize = function initialize() {
      var pixelRatio = window.devicePixelRatio;
      var multiplier = points.length;
      var duration = 0.4;
      var geometry = [{ x: 0, y: 0, z: 0 }];
      var pointSize = 4..toFixed(1);

var step = 0;
      setTimeout(function () {
        step = 0.004;
      }, 400);

var uniforms = [{
        name: 'uProgress',
        type: 'float',
        value: 0.0
      }];

var fragmentShader = '\n    precision mediump float;\n\n    varying vec3 vColor;\n\n    void main() {\n      //  vec2 pc = 2.0 * gl_PointCoord - 1.0;\n      //  gl_FragColor = vec4(vColor, 1.0 - dot(pc, pc));\n      gl_FragColor = vec4(vColor, 1.0);\n    }\n  ';

var onSetup = function onSetup(gl) {
        gl.blendFunc(gl.SRC_ALPHA, gl.ONE);
        gl.enable(gl.BLEND);
      };

var onRepeat = function onRepeat() {
        rotateY(uniforms[uniforms.length - 1].value, 0.002);
        if (uniforms[0].value > 1) {
          uniforms[0].value = 0;
        }
        uniforms[0].value += step;
      };

var options = {
        onSetup: onSetup,
        onRepeat: onRepeat,
        pixelRatio: pixelRatio
      };

starlings(canvas, geometry, multiplier, attributes, uniforms, vertexShader, fragmentShader, options);
    };

var getRandom = function getRandom(value) {
      return Math.random() * value - value / 2;
    };

var rotateY = function rotateY(matrix, angle) {
      var sin = Math.sin(angle);
      var cos = Math.cos(angle);
      var clone = JSON.parse(JSON.stringify(matrix));

matrix[0] = clone[0] * cos - clone[8] * sin;
      matrix[1] = clone[1] * cos - clone[9] * sin;
      matrix[2] = clone[2] * cos - clone[10] * sin;
      matrix[3] = clone[3] * cos - clone[11] * sin;
      matrix[8] = clone[0] * sin + clone[8] * cos;
      matrix[9] = clone[1] * sin + clone[9] * cos;
      matrix[10] = clone[2] * sin + clone[10] * cos;
      matrix[11] = clone[3] * sin + clone[11] * cos;
    };

var h2r = function h2r(p, q, t) {
      if (t < 0) t += 1;
      if (t > 1) t -= 1;
      if (t < 1 / 6) return p + (q - p) * 6 * t;
      if (t < 1 / 2) return q;
      if (t < 2 / 3) return p + (q - p) * 6 * (2 / 3 - t);
      return p;
    };

var getHSL = function getHSL(h, s, l) {
      h = (h % 1 + 1) % 1;
      s = Math.max(0, Math.min(1, s));
      l = Math.max(0, Math.min(1, l));
      if (s === 0) return [l, l, l];
      var p = l <= 0.5 ? l * (1 + s) : l + s - l * s;
      var q = 2 * l - p;
      return [h2r(q, p, h + 1 / 3), h2r(q, p, h), h2r(q, p, h - 1 / 3)];
    };

var ratio = window.innerWidth / window.innerHeight;
    var halfWidth = window.innerWidth * devicePixelRatio / 2;
    var halfHeight = window.innerHeight * devicePixelRatio / 2;

document.querySelector('.reset').addEventListener('click', function () {
      input.querySelector('canvas').getContext('2d').clearRect(0, 0, window.innerWidth * window.devicePixelRatio, window.innerHeight * window.devicePixelRatio);
      output.style.opacity = '0';
      output.style.visibility = 'hidden';
      setTimeout(function () {
        segments.length = 0;
        points.length = 0;
        input.style.opacity = '1';
        input.style.visibility = 'visible';
      }, 600);
    });
  })();
}

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