添加鼠标单击烟花特效

components/Fireworks.js

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+/**
+ * https://codepen.io/juliangarnier/pen/gmOwJX
+ * custom by hexo-theme-yun @YunYouJun
+ */
+import React from 'react'
+import anime from 'animejs'
+
+export const Fireworks = () => {
+  React.useEffect(() => {
+    createFireworks({})
+  }, [])
+  return <canvas id='fireworks' className='fireworks'></canvas>
+}
+
+/**
+   * 创建烟花
+   * @param config
+   */
+function createFireworks(config) {
+  const defaultColors = ['102, 167, 221', '62, 131, 225', '33, 78, 194']
+  const defaultConfig = {
+    colors: defaultColors,
+    numberOfParticules: 20,
+    orbitRadius: {
+      min: 50,
+      max: 100
+    },
+    circleRadius: {
+      min: 10,
+      max: 20
+    },
+    diffuseRadius: {
+      min: 50,
+      max: 100
+    },
+    animeDuration: {
+      min: 900,
+      max: 1500
+    }
+  }
+  config = Object.assign(defaultConfig, config)
+
+  let pointerX = 0
+  let pointerY = 0
+
+  // sky blue
+  const colors = config.colors || defaultColors
+
+  const canvasEl = document.querySelector('.fireworks')
+  const ctx = canvasEl.getContext('2d')
+
+  /**
+     * 设置画布尺寸
+     */
+  function setCanvasSize(canvasEl) {
+    canvasEl.width = window.innerWidth
+    canvasEl.height = window.innerHeight
+    canvasEl.style.width = `${window.innerWidth}px`
+    canvasEl.style.height = `${window.innerHeight}px`
+  }
+
+  /**
+     * update pointer
+     * @param {TouchEvent} e
+     */
+  function updateCoords(e) {
+    pointerX =
+        e.clientX ||
+        (e.touches[0] ? e.touches[0].clientX : e.changedTouches[0].clientX)
+    pointerY =
+        e.clientY ||
+        (e.touches[0] ? e.touches[0].clientY : e.changedTouches[0].clientY)
+  }
+
+  function setParticuleDirection(p) {
+    const angle = (anime.random(0, 360) * Math.PI) / 180
+    const value = anime.random(
+      config.diffuseRadius.min,
+      config.diffuseRadius.max
+    )
+    const radius = [-1, 1][anime.random(0, 1)] * value
+    return {
+      x: p.x + radius * Math.cos(angle),
+      y: p.y + radius * Math.sin(angle)
+    }
+  }
+
+  /**
+     * 在指定位置创建粒子
+     * @param {number} x
+     * @param {number} y
+     * @returns
+     */
+  function createParticule(x, y) {
+    const p = {
+      x,
+      y,
+      color: `rgba(${
+          colors[anime.random(0, colors.length - 1)]
+        },${
+          anime.random(0.2, 0.8)
+        })`,
+      radius: anime.random(config.circleRadius.min, config.circleRadius.max),
+      endPos: null,
+      draw() {}
+    }
+    p.endPos = setParticuleDirection(p)
+    p.draw = function() {
+      ctx.beginPath()
+      ctx.arc(p.x, p.y, p.radius, 0, 2 * Math.PI, true)
+      ctx.fillStyle = p.color
+      ctx.fill()
+    }
+    return p
+  }
+
+  function createCircle(x, y) {
+    const p = {
+      x,
+      y,
+      color: '#000',
+      radius: 0.1,
+      alpha: 0.5,
+      lineWidth: 6,
+      draw() {}
+    }
+    p.draw = function() {
+      ctx.globalAlpha = p.alpha
+      ctx.beginPath()
+      ctx.arc(p.x, p.y, p.radius, 0, 2 * Math.PI, true)
+      ctx.lineWidth = p.lineWidth
+      ctx.strokeStyle = p.color
+      ctx.stroke()
+      ctx.globalAlpha = 1
+    }
+    return p
+  }
+
+  function renderParticule(anim) {
+    for (let i = 0; i < anim.animatables.length; i++) { anim.animatables[i].target.draw() }
+  }
+
+  function animateParticules(x, y) {
+    const circle = createCircle(x, y)
+    const particules = []
+    for (let i = 0; i < config.numberOfParticules; i++) { particules.push(createParticule(x, y)) }
+
+    anime
+      .timeline()
+      .add({
+        targets: particules,
+        x(p) {
+          return p.endPos.x
+        },
+        y(p) {
+          return p.endPos.y
+        },
+        radius: 0.1,
+        duration: anime.random(
+          config.animeDuration.min,
+          config.animeDuration.max
+        ),
+        easing: 'easeOutExpo',
+        update: renderParticule
+      })
+      .add(
+        {
+          targets: circle,
+          radius: anime.random(config.orbitRadius.min, config.orbitRadius.max),
+          lineWidth: 0,
+          alpha: {
+            value: 0,
+            easing: 'linear',
+            duration: anime.random(600, 800)
+          },
+          duration: anime.random(1200, 1800),
+          easing: 'easeOutExpo',
+          update: renderParticule
+        },
+        0
+      )
+  }
+
+  const render = anime({
+    duration: Infinity,
+    update: () => {
+      ctx.clearRect(0, 0, canvasEl.width, canvasEl.height)
+    }
+  })
+
+  document.addEventListener(
+    'mousedown',
+    (e) => {
+      render.play()
+      updateCoords(e)
+      animateParticules(pointerX, pointerY)
+    },
+    false
+  )
+
+  setCanvasSize(canvasEl)
+  window.addEventListener(
+    'resize',
+    () => {
+      setCanvasSize(canvasEl)
+    },
+    false
+  )
+}