利用HTML5实现SVG夜晚天空星星流星特效



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特效描述:利用HTML5实现 SVG夜晚 天空星星 流星特效,利用HTML5实现SVG夜晚天空星星流星特效 

代码结构

1. HTML代码

<div class="container">
  <div class="content">
    <canvas id="universe"></canvas>
    <div id="footer">
      <svg id="scene" x="0px" y="0px" width="1600px" height="315px">
        <path id="ground" d="M0,316.4209c0,0,157.7119-35.416,469-56c7.3833-0.4883,23.7876-3.5488,31.3335-4.0166
                	c3.7681-0.2334,19.4302,0.9424,28.3335,0.3506c17.1494-1.1396,30.9072-4.2734,38.333-4.6836
                	c7.5972-0.4189,18.4058,0.3799,27.6665-0.9834c5.7075-0.8408,10.1318-4.042,14.9248-4.2705
                	c7.8369-0.373,24.5693,3.6084,34.4087,4.2705c11.0586,0.7432,15.2656-1.8135,24.3335-2.1523c10.0576-0.376,20.4629,1.3867,28.6665,0
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                	c1.499-0.0127,1.833,0.6221,3.3345,0.6104c1.3296-0.0098,3.8267-0.666,5.1587-0.6748c1.3335-0.0088,2.8389-0.6514,4.1743-0.6592
                	c1.3335-0.0078,2.4971,0.6191,3.8325,0.6123c2.5518-0.0127,7.3579,0.3965,9.9175,0.3877c5.3169-0.0176,5.5796-0.4063,10.9297-0.4063
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                	c6.8594,0.3076,7.9102,1.7656,14.6855,2.0977c8.916,0.4365,23.5254-0.2432,32.293,0.2344
                	c6.7168,0.3662,13.3896,0.7432,20.0186,1.1318C1458.8545,268.4941,1680,316.4209,1680,316.4209H0z" />
        <path id="stone1" d="M680.3335,250.7549c7.3335,0.333,13.6665-1.2549,6-6.4609s-14.333-7.1221-18.6665,0.8359
                	S680.3335,250.7549,680.3335,250.7549z" />
        <path id="stone2" d="M750.5,243.1709c3.25,0,2.5-3.707-1.75-4.2285s-5,3.7285-3,4.2285S750.5,243.1709,750.5,243.1709z" />
        <path id="stone3" d="M988.4893,243.8242c2.8857,0.3467,4.8438,1.2627,3.0107-2.0703s-7.3955,1.3555-5.2031,1.7129
                	S988.4893,243.8242,988.4893,243.8242z" />
        <path id="stone4" d="M697,248.9355c2.0142-0.2021,2.1665-2.0156,1-2.1816s-9.1543,1.8398-5.9937,2.6699S697,248.9355,697,248.9355z" />
        <g id="greens" transform="translate(850, 180)">
          <g>
            <path d="M36.3877,59.4268C33.0576,18.9482,6.4658,4.522,6.4658,4.522s22.4834,16.1426,24.4414,54.2251
			C32.8657,96.8311,36.3877,59.4268,36.3877,59.4268z" />
            <path d="M41.8496,83.1641C31.1572,43.98,2.3711,34.6738,2.3711,34.6738s25.063,11.7471,33.9668,48.8271
			C45.2441,120.5791,41.8496,83.1641,41.8496,83.1641z" />
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            <path d="M29.4976,87.9092c27.4097-30.5938,19.2993-60.6226,19.2993-60.6226s3.958,28.1255-22.6606,56.0249
			C-0.4775,111.2109,29.4976,87.9092,29.4976,87.9092z" />
            <animateTransform attributeName="transform" type="skewX" values="0;10;0" begin="0s" dur="5.5s" fill="freeze" repeatCount="indefinite" />
            <animateMotion type="translate" values="0,0;-10,0;0,0" begin="0s" dur="5.5s" fill="freeze" repeatCount="indefinite" />
          </g>
          <g>
            <path d="M34.9995,60.4189C56.0713,30.6665,46.1133,5.4014,46.1133,5.4014S52.2559,29.4746,31.6235,56.79
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            <path d="M36.3047,64.5391c28.4629-23.4443,25.3262-51.189,25.3262-51.189s-0.293,25.4971-27.6851,46.6538
			C6.5552,81.1631,36.3047,64.5391,36.3047,64.5391z" />
            <path d="M33.0449,70.502c31.4424-19.2637,32.1875-47.1748,32.1875-47.1748s-3.8291,25.208-33.897,42.3584
			C1.271,82.833,33.0449,70.502,33.0449,70.502z" />
            <path d="M13.8237,76.0244c36.5039-5.2158,48.2563-30.543,48.2563-30.543S48.5693,67.1045,14.168,70.9248
			C-20.2324,74.749,13.8237,76.0244,13.8237,76.0244z" />
            <animateTransform attributeName="transform" type="skewX" values="0;15;0" begin="0s" dur="5s" fill="freeze" repeatCount="indefinite" />
            <animateMotion type="translate" values="0,0;-15,0;0,0" begin="0s" dur="5s" fill="freeze" repeatCount="indefinite" />
          </g>
        </g>
        <g id="sign" transform="translate(700, 180)">
          <polygon points="21.2168,1.1143 20.6665,1.5459 19.7593,1.4473 19.229,1.4209 18.9707,1.6274 18.6665,1.9004 17.6865,1.9219
		37.3516,87.8877 40.8828,87.0791 	" />
          <polygon points="45.4111,9.5537 2.4258,18.7158 1.563,18.498 1.4585,17.2114 0.8291,15.583 0.9165,14.3364 0.0908,12.6548
		0.2085,12.0864 -0.1924,11.5308 -0.3296,9.271 43.3408,-0.0376 43.4766,0.5015 43.334,0.9629 43.6533,1.2046 43.8232,1.8784
		43.8965,2.7754 44.2217,3.459 44.625,5.0576 45.041,7.5459 45.2637,7.5962 45.6191,9.0073 	" />
          <polygon points="47.0078,20.8545 4.2368,29.5503 3.5933,28.5903 3.3965,26.9746 2.4683,24.5137 2.8398,24.1372 2.2676,23.7847
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		47.3027,27.8667 47.8086,30.2017 	" />
        </g>
        <g id="boy_1_">
          <g id="boy">
            <path d="M800.7324,167.6929c0,0-7.9688-6.5039-9.7197-8.041c-1.751-1.5366-7.9331-6.5039-8.7197-13.0435
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            <path d="M810.7031,169.2109c-1.0723-1.3037-1.3574-2.9556-1.1426-4.0645c0.2139-1.1084-8.041,0.1128-8.8281,2.542
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			s0.4648,3.3975-0.9277,6.6855c-1.3945,3.2881-4.1465,6.7568-4.1465,6.7568h11.0781c0,0,1.5723-3.5234-7.1113-2.2363
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      </svg>
    </div>
  </div>
</div>
<script>
window.requestAnimationFrame = window.requestAnimationFrame || window.mozRequestAnimationFrame ||
  window.webkitRequestAnimationFrame || window.msRequestAnimationFrame;
var starDensity = .216;
var speedCoeff = .05;
var width;
var height;
var starCount;
var circleRadius;
var circleCenter;
var first = true;
var giantColor = '180,184,240';
var starColor = '226,225,142';
var cometColor = '226,225,224';
var canva = document.getElementById('universe');
var stars = [];
windowResizeHandler();
window.addEventListener('resize', windowResizeHandler, false);
createUniverse();
function createUniverse() {
  universe = canva.getContext('2d');
  for (var i = 0; i < starCount; i++) {
    stars[i] = new Star();
    stars[i].reset();
  }
  draw();
}
function draw() {
  universe.clearRect(0, 0, width, height);
  var starsLength = stars.length;
  for (var i = 0; i < starsLength; i++) {
    var star = stars[i];
    star.move();
    star.fadeIn();
    star.fadeOut();
    star.draw();
  }
  window.requestAnimationFrame(draw);
}
function Star() {
  this.reset = function() {
    this.giant = getProbability(3);
    this.comet = this.giant || first ? false : getProbability(10);
    this.x = getRandInterval(0, width - 10);
    this.y = getRandInterval(0, height);
    this.r = getRandInterval(1.1, 2.6);
    this.dx = getRandInterval(speedCoeff, 6 * speedCoeff) + (this.comet + 1 - 1) * speedCoeff * getRandInterval(50, 120) + speedCoeff * 2;
    this.dy = -getRandInterval(speedCoeff, 6 * speedCoeff) - (this.comet + 1 - 1) * speedCoeff * getRandInterval(50, 120);
    this.fadingOut = null;
    this.fadingIn = true;
    this.opacity = 0;
    this.opacityTresh = getRandInterval(.2, 1 - (this.comet + 1 - 1) * .4);
    this.do = getRandInterval(0.0005, 0.002) + (this.comet + 1 - 1) * .001;
  };
  this.fadeIn = function() {
    if (this.fadingIn) {
      this.fadingIn = this.opacity > this.opacityTresh ? false : true;
      this.opacity += this.do;
    }
  };
  this.fadeOut = function() {
    if (this.fadingOut) {
      this.fadingOut = this.opacity < 0 ? false : true;
      this.opacity -= this.do / 2;
      if (this.x > width || this.y < 0) {
        this.fadingOut = false;
        this.reset();
      }
    }
  };
  this.draw = function() {
    universe.beginPath();
    if (this.giant) {
      universe.fillStyle = 'rgba(' + giantColor + ',' + this.opacity + ')';
      universe.arc(this.x, this.y, 2, 0, 2 * Math.PI, false);
    } else if (this.comet) {
      universe.fillStyle = 'rgba(' + cometColor + ',' + this.opacity + ')';
      universe.arc(this.x, this.y, 1.5, 0, 2 * Math.PI, false);
      //comet tail
      for (var i = 0; i < 30; i++) {
        universe.fillStyle = 'rgba(' + cometColor + ',' + (this.opacity - (this.opacity / 20) * i) + ')';
        universe.rect(this.x - this.dx / 4 * i, this.y - this.dy / 4 * i - 2, 2, 2);
        universe.fill();
      }
    } else {
      universe.fillStyle = 'rgba(' + starColor + ',' + this.opacity + ')';
      universe.rect(this.x, this.y, this.r, this.r);
    }
    universe.closePath();
    universe.fill();
  };
  this.move = function() {
    this.x += this.dx;
    this.y += this.dy;
    if (this.fadingOut === false) {
      this.reset();
    }
    if (this.x > width - (width / 4) || this.y < 0) {
      this.fadingOut = true;
    }
  };
  (function() {
    setTimeout(function() {
      first = false;
    }, 50)
  })()
}
function getProbability(percents) {
  return ((Math.floor(Math.random() * 1000) + 1) < percents * 10);
}
function getRandInterval(min, max) {
  return (Math.random() * (max - min) + min);
}
function windowResizeHandler() {
  width = window.innerWidth;
  height = window.innerHeight;
  starCount = width * starDensity;
  circleRadius = (width > height ? height / 2 : width / 2);
  circleCenter = {
    x: width / 2,
    y: height / 2
  }
  canva.setAttribute('width', width);
  canva.setAttribute('height', height);
}</script>



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