GSAP 3.0-气泡画布粒子

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JavaScript

var n = 200,
    speed = 0.05,
    wind = 15,
    windVariance = 25, // 1 = no variance
    trail = true;

// ...not these
var c = document.getElementById("c"),
    ctx = c.getContext("2d"),
    cw = (c.width = window.innerWidth),
    ch = (c.height = window.innerHeight),
    img = new Image(100,100),
    img2 = new Image(100,100),
    img3 = new Image(100,100),
    mouseProps = {x:cw/2, down:1},
    particles = [],
    Particle = function(index) {
      this.img = [img,img2,img3][index%3];    	
      this.x = this.y = this.progress = this.alpha = 1;
      this.size = 12 + 75*((index+1)/n); //min size+
      if (index>n*0.97) this.size*=3; //make a few big foreground particles
      
      this.dur = (11 - 10*((index+1)/n))/speed;
      	
    	var rot = -rand(3,5); 
	    if (index%4==0) rot= -rot;
	    
      this.draw = function() {
	    	ctx.translate( this.x+((mouseProps.x-cw/2)*(this.size/1000)), this.y );
	      ctx.rotate(rot*this.progress);
	      ctx.globalAlpha = this.alpha;
	      ctx.drawImage(this.img, -this.size/2, -this.size/2, this.size, this.size);
	      ctx.rotate(-rot*this.progress);
	      ctx.translate( -this.x-((mouseProps.x-cw/2)*(this.size/1000)), -this.y );
	    }
    };

// First run
for (var i=0; i<n; i++) {
    particles.push(new Particle(i));
    setParticle(particles[i]);
}

gsap.ticker.add(function(){
  ctx.globalCompositeOperation = 'source-over';
  ctx.fillStyle = "rgba(15,15,15,"+mouseProps.down+")";
	ctx.fillRect(0, 0, cw, ch);
  ctx.globalCompositeOperation = 'lighter';
 	for (var i=0; i<n; i++) particles[i].draw();
});

window.addEventListener('resize', function() {
  particleNumber = 0;  
  cw = (c.width = window.innerWidth);
  ch = (c.height = window.innerHeight);
  for (var i=0; i<n; i++) {
    TweenMax.killTweensOf(particles[i]);
    setParticle(particles[i]);
  }
});

function rand(min=0, max=1) {
  return min + (max-min)*Math.random();
}

img.src = 'https://www.jq22.com/tp/6372734654411953549030141.png';
img2.src = 'https://www.jq22.com/tp/6372734654776014711385261.png';
img3.src = 'https://www.jq22.com/tp/6372734654411953549030141.png';

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