谁说程序员不懂浪漫？动态樱花爱心来咯～【附源代码】

╰半夏微凉° 2023-09-23 14:31 116阅读 0赞

先看效果：  
![在这里插入图片描述][7fd5c1bb1d5945558e1d4b8ed06b4a1b.gif]  
话不多说，直接上代码

可以直接复制粘贴到记事本里面，后缀改为.html保存浏览器打开即可

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
    <HTML>
     <HEAD>
      <TITLE> New Document </TITLE>
      <META NAME="Generator" CONTENT="EditPlus">
      <META NAME="Author" CONTENT="">
      <META NAME="Keywords" CONTENT="">
      <META NAME="Description" CONTENT="">
      <style>
      html, body {
         
      height: 100%;
      padding: 0;
      margin: 0;
      background: #000;
    }
    canvas {
         
      position: absolute;
      width: 100%;
      height: 100%;
    }
      </style>
     </HEAD>
     
     <BODY>
      <canvas id="pinkboard"></canvas>
      <script>
      /*
     * Settings
     */
    var settings = {
         
      particles: {
         
        length:   500, // maximum amount of particles
        duration:   2, // particle duration in sec
        velocity: 100, // particle velocity in pixels/sec
        effect: -0.75, // play with this for a nice effect
        size:      30, // particle size in pixels
      },
    };
     
    /*
     * RequestAnimationFrame polyfill by Erik Möller
     */
    (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)}}}());
     
    /*
     * Point class
     */
    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;
    })();
     
    /*
     * Particle class
     */
    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;
    })();
     
    /*
     * ParticlePool class
     */
    var ParticlePool = (function() {
         
      var particles,
          firstActive = 0,
          firstFree   = 0,
          duration    = settings.particles.duration;
      
      function ParticlePool(length) {
         
        // create and populate particle pool
        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);
        
        // handle circular queue
        firstFree++;
        if (firstFree   == particles.length) firstFree   = 0;
        if (firstActive == firstFree       ) firstActive++;
        if (firstActive == particles.length) firstActive = 0;
      };
      ParticlePool.prototype.update = function(deltaTime) {
         
        var i;
        
        // update active particles
        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);
        }
        
        // remove inactive particles
        while (particles[firstActive].age >= duration && firstActive != firstFree) {
         
          firstActive++;
          if (firstActive == particles.length) firstActive = 0;
        }
        
        
      };
      ParticlePool.prototype.draw = function(context, image) {
         
        // draw active particles
        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;
    })();
     
    /*
     * Putting it all together
     */
    (function(canvas) {
         
      var context = canvas.getContext('2d'),
          particles = new ParticlePool(settings.particles.length),
          particleRate = settings.particles.length / settings.particles.duration, // particles/sec
          time;
      
      // get point on heart with -PI <= t <= PI
      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
        );
      }
      
      // creating the particle image using a dummy canvas
      var image = (function() {
         
        var canvas  = document.createElement('canvas'),
            context = canvas.getContext('2d');
        canvas.width  = settings.particles.size;
        canvas.height = settings.particles.size;
        // helper function to create the path
        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;
        }
        // create the path
        context.beginPath();
        var t = -Math.PI;
        var point = to(t);
        context.moveTo(point.x, point.y);
        while (t < Math.PI) {
         
          t += 0.01; // baby steps!
          point = to(t);
          context.lineTo(point.x, point.y);
        }
        context.closePath();
        // create the fill
        context.fillStyle = '#ea80b0';
        context.fill();
        // create the image
        var image = new Image();
        image.src = canvas.toDataURL();
        return image;
      })();
      
      // render that thing!
      function render() {
         
        // next animation frame
        requestAnimationFrame(render);
        
        // update time
        var newTime   = new Date().getTime() / 1000,
            deltaTime = newTime - (time || newTime);
        time = newTime;
        
        // clear canvas
        context.clearRect(0, 0, canvas.width, canvas.height);
        
        // create new particles
        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);
        }
        
        // update and draw particles
        particles.update(deltaTime);
        particles.draw(context, image);
      }
      
      // handle (re-)sizing of the canvas
      function onResize() {
         
        canvas.width  = canvas.clientWidth;
        canvas.height = canvas.clientHeight;
      }
      window.onresize = onResize;
      
      // delay rendering bootstrap
      setTimeout(function() {
         
        onResize();
        render();
      }, 10);
    })(document.getElementById('pinkboard'));
      </script>
     </BODY>
    </HTML>

[7fd5c1bb1d5945558e1d4b8ed06b4a1b.gif]: https://img-blog.csdnimg.cn/7fd5c1bb1d5945558e1d4b8ed06b4a1b.gif