blog-ruoyi/blog-web-static/script/fireworks.js

function updateCoords(e) {
  pointerX = (e.clientX || e.touches[0].clientX) - canvasEl.getBoundingClientRect().left,
    pointerY = e.clientY || e.touches[0].clientY - canvasEl.getBoundingClientRect().top
}

function setParticuleDirection(e) {
  var t = anime.random(0, 360) * Math.PI / 180,
    a = anime.random(50, 180),
    n = [-1, 1][anime.random(0, 1)] * a;
  return {
    x: e.x + n * Math.cos(t),
    y: e.y + n * Math.sin(t)
  }
}

function createParticule(e, t) {
  var a = {};
  return a.x = e,
    a.y = t,
    a.color = colors[anime.random(0, colors.length - 1)],
    a.radius = anime.random(16, 32),
    a.endPos = setParticuleDirection(a),
    a.draw = function() {
      ctx.beginPath(),
        ctx.arc(a.x, a.y, a.radius, 0, 2 * Math.PI, !0),
        ctx.fillStyle = a.color,
        ctx.fill()
    },
    a
}

function createCircle(e, t) {
  var a = {};
  return a.x = e,
    a.y = t,
    a.color = "#F00",
    a.radius = .1,
    a.alpha = .5,
    a.lineWidth = 6,
    a.draw = function() {
      ctx.globalAlpha = a.alpha,
        ctx.beginPath(),
        ctx.arc(a.x, a.y, a.radius, 0, 2 * Math.PI, !0),
        ctx.lineWidth = a.lineWidth,
        ctx.strokeStyle = a.color,
        ctx.stroke(),
        ctx.globalAlpha = 1
    },
    a
}

function renderParticule(e) {
  for (var t = 0; t < e.animatables.length; t++)
    e.animatables[t].target.draw()
}

function animateParticules(e, t) {
  for (var a = createCircle(e, t), n = [], i = 0; i < numberOfParticules; i++)
    n.push(createParticule(e, t));
  anime.timeline().add({
    targets: n,
    x: function(e) {
      return e.endPos.x
    },
    y: function(e) {
      return e.endPos.y
    },
    radius: .1,
    duration: anime.random(1200, 1800),
    easing: "easeOutExpo",
    update: renderParticule
  }).add({
    targets: a,
    radius: anime.random(80, 160),
    lineWidth: 0,
    alpha: {
      value: 0,
      easing: "linear",
      duration: anime.random(600, 800)
    },
    duration: anime.random(1200, 1800),
    easing: "easeOutExpo",
    update: renderParticule,
    offset: 0
  })
}

function debounce(fn, delay) {
  var timer
  return function() {
    var context = this
    var args = arguments
    clearTimeout(timer)
    timer = setTimeout(function() {
      fn.apply(context, args)
    }, delay)
  }
}

var canvasEl = document.querySelector(".fireworks");
if (canvasEl) {
  var ctx = canvasEl.getContext("2d"),
    numberOfParticules = 30,
    pointerX = 0,
    pointerY = 0,
    tap = "mousedown",
    colors = ["#FF1461", "#18FF92", "#5A87FF", "#FBF38C"],
    setCanvasSize = debounce(function() {
      canvasEl.width = 2 * window.innerWidth,
        canvasEl.height = 2 * window.innerHeight,
        canvasEl.style.width = window.innerWidth + "px",
        canvasEl.style.height = window.innerHeight + "px",
        canvasEl.getContext("2d").scale(2, 2)
    }, 500),
    render = anime({
      duration: 1 / 0,
      update: function() {
        ctx.clearRect(0, 0, canvasEl.width, canvasEl.height)
      }
    });
  document.addEventListener(tap, function(e) {
      "sidebar" !== e.target.id && "toggle-sidebar" !== e.target.id && "A" !== e.target.nodeName && "IMG" !== e.target.nodeName && (render.play(),
        updateCoords(e),
        animateParticules(pointerX, pointerY))
    }, !1),
    setCanvasSize(),
    window.addEventListener("resize", setCanvasSize, !1)
}