HTML+CSS+JavaScript实现樱花爱心_樱花html代码

作者：Cpp五条 | 2024-05-21 15:38:29
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樱花html代码
HTML+CSS+JavaScript实现樱花爱心

效果图: 在这里插入图片描述
代码块
<!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"> -->
  <meta name="Generator" content="EditPlus">
  <meta name="Author" content="">
  <meta name="Keywords" content="">
  <meta name="Description" content="">
  <title>LOVE</title>

  <style>
    html,
    body {
      height: 100%;
      padding: 0;
      margin: 0;
      background: #000;
      background: linear-gradient(270deg, rgba(244, 67, 51, 0.5) 0%, rgba(255, 39, 104, 0.5) 100%);
    }

    canvas {
      position: absolute;
      width: 100%;
      height: 100%;
    }
  </style>
</head>

<body>
  <canvas id="pinkboard"></canvas>

  <script>
    /**
     * settings
     * */
    var settings = {
      particles: {
        length: 500,    // 最大颗粒量
        duration: 2,    // 粒子持续时间(秒)
        velocity: 100,  // 粒子速度，单位为像素/秒
        effect: -0.75,  // 粒子位置
        size: 30,       // 颗粒大小(像素)
      },
    };

    (function () {
      var b = 0;
      var c = ["ms", "moz", "webkit", "o"];
      for (var a = 0; a < c.length && !window.requestAnimationFrame; ++a) {
        window.requestAnimationFrame = window[c[a] + "RequestAnimationFrame"];
        window.cancelAnimationFrame = window[c[a] + "CancelAnimationFrame"] || window[c[a] + "CancelRequestAnimationFrame"]
      }
      if (!window.requestAnimationFrame) {
        window.requestAnimationFrame = function (h, e) {
          var d = new Date().getTime();
          var f = Math.max(0, 16 - (d - b));
          var g = window.setTimeout(function () {
            h(d + f)
          }, f);
          b = d + f;
          return g
        }
      }
      if (!window.cancelAnimationFrame) {
        window.cancelAnimationFrame = function (d) {
          clearTimeout(d)
        }
      }
    }());

    var Point = (function () {
      function Point(x, y) {
        this.x = (typeof x !== 'undefined') ? x : 0;
        this.y = (typeof y !== 'undefined') ? y : 0;
      }

      Point.prototype.clone = function () {
        return new Point(this.x, this.y);
      };

      Point.prototype.length = function (length) {
        if (typeof length == 'undefined')
          return Math.sqrt(this.x * this.x + this.y * this.y);
        this.normalize();
        this.x *= length;
        this.y *= length;
        return this;
      };

      Point.prototype.normalize = function () {
        var length = this.length();
        this.x /= length;
        this.y /= length;
        return this;
      };

      return Point;
    })();

    var Particle = (function () {
      function Particle() {
        this.position = new Point();
        this.velocity = new Point();
        this.acceleration = new Point();
        this.age = 0;
      }

      Particle.prototype.initialize = function (x, y, dx, dy) {
        this.position.x = x;
        this.position.y = y;
        this.velocity.x = dx;
        this.velocity.y = dy;
        this.acceleration.x = dx * settings.particles.effect;
        this.acceleration.y = dy * settings.particles.effect;
        this.age = 0;
      };

      Particle.prototype.update = function (deltaTime) {
        this.position.x += this.velocity.x * deltaTime;
        this.position.y += this.velocity.y * deltaTime;
        this.velocity.x += this.acceleration.x * deltaTime;
        this.velocity.y += this.acceleration.y * deltaTime;
        this.age += deltaTime;
      };

      Particle.prototype.draw = function (context, image) {
        function ease(t) {
          return (--t) * t * t + 1;
        }
        var size = image.width * ease(this.age / settings.particles.duration);
        context.globalAlpha = 1 - this.age / settings.particles.duration;
        context.drawImage(image, this.position.x - size / 2, this.position.y - size / 2, size, size);
      };

      return Particle;
    })();

    var ParticlePool = (function () {

      var particles, firstActive = 0, firstFree = 0, duration = settings.particles.duration;

      function ParticlePool(length) {
        particles = new Array(length);
        for (var i = 0; i < particles.length; i++) {
          particles[i] = new Particle();
        }
      }

      ParticlePool.prototype.add = function (x, y, dx, dy) {
        particles[firstFree].initialize(x, y, dx, dy);
        firstFree++;
        if (firstFree == particles.length) firstFree = 0;
        if (firstActive == firstFree) firstActive++;
        if (firstActive == particles.length) firstActive = 0;
      };

      ParticlePool.prototype.update = function (deltaTime) {
        var i;
        if (firstActive < firstFree) {
          for (i = firstActive; i < firstFree; i++) {
            particles[i].update(deltaTime);
          }
        }

        if (firstFree < firstActive) {
          for (i = firstActive; i < particles.length; i++) {
            particles[i].update(deltaTime);
          }
          for (i = 0; i < firstFree; i++) {
            particles[i].update(deltaTime);
          }
        }

        while (particles[firstActive].age >= duration && firstActive != firstFree) {
          firstActive++;
          if (firstActive == particles.length) firstActive = 0;
        }

      };

      ParticlePool.prototype.draw = function (context, image) {
        if (firstActive < firstFree) {
          for (i = firstActive; i < firstFree; i++) {
            particles[i].draw(context, image);
          }
        }

        if (firstFree < firstActive) {
          for (i = firstActive; i < particles.length; i++) {
            particles[i].draw(context, image);
          }
          for (i = 0; i < firstFree; i++) {
            particles[i].draw(context, image);
          }
        }
      };

      return ParticlePool;

    })();

    (function (canvas) {
      var context = canvas.getContext('2d'), particles = new ParticlePool(settings.particles.length), particleRate = settings.particles.length / settings.particles.duration, time;

      function pointOnHeart(t) {
        return new Point(
          160 * Math.pow(Math.sin(t), 3),
          130 * Math.cos(t) - 50 * Math.cos(2 * t) - 20 * Math.cos(3 * t) - 10 * Math.cos(4 * t) + 25
        );
      }

      var image = (function () {
        var canvas = document.createElement('canvas'), context = canvas.getContext('2d');
        canvas.width = settings.particles.size;
        canvas.height = settings.particles.size;

        function to(t) {
          var point = pointOnHeart(t);
          point.x = settings.particles.size / 2 + point.x * settings.particles.size / 350;
          point.y = settings.particles.size / 2 - point.y * settings.particles.size / 350;
          return point;
        }

        context.beginPath();

        var t = -Math.PI;
        var point = to(t);
        context.moveTo(point.x, point.y);
        while (t < Math.PI) {
          t += 0.01;
          point = to(t);
          context.lineTo(point.x, point.y);
        }

        context.closePath();

        context.fillStyle = '#FFFFFF';

        context.fill();

        var image = new Image();
        image.src = canvas.toDataURL();
        return image;
      })();

      function render() {
        requestAnimationFrame(render);
        var newTime = new Date().getTime() / 1000, deltaTime = newTime - (time || newTime);
        time = newTime;
        context.clearRect(0, 0, canvas.width, canvas.height);
        var amount = particleRate * deltaTime;
        for (var i = 0; i < amount; i++) {
          var pos = pointOnHeart(Math.PI - 2 * Math.PI * Math.random());
          var dir = pos.clone().length(settings.particles.velocity);
          particles.add(canvas.width / 2 + pos.x, canvas.height / 2 - pos.y, dir.x, -dir.y);
        }
        particles.update(deltaTime);
        particles.draw(context, image);
      }

      function onResize() {
        canvas.width = canvas.clientWidth;
        canvas.height = canvas.clientHeight;
      }

      window.onresize = onResize;

      setTimeout(function () {
        onResize();
        render();
      }, 10);

    })(document.getElementById('pinkboard'));
  </script>
</body>

</html>
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