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457 lines
15 KiB
Markdown
457 lines
15 KiB
Markdown
---
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title: 背景特效
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tags:
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- Mkdocs
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---
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!!! Note
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以下代码均在`docs/javascripts/extra.js`下复制粘贴
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<div id="snowflakes-container"></div>
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<script>
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// 在LocalStorage中设置不显示雪花效果的标志
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localStorage.setItem('showSnowflakes', 'true');
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</script>
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<script>
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// 判断LocalStorage中是否设置了显示雪花效果的标志
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if (localStorage.getItem('showSnowflakes') === 'true') {
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var script = document.createElement('script');
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script.src = 'https://www.lanjie100.com/js/snow.user.js';
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document.head.appendChild(script);
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}
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</script>
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## 雪花❄️
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```js
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//雪花
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const fps = 30;
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const mspf = Math.floor(1000 / fps) ;
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let width = window.innerWidth || document.documentElement.clientWidth;
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let height = window.innerHeight || document.documentElement.clientHeight;
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let canvas;
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window.addEventListener('resize', () => {
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width = window.innerWidth || document.documentElement.clientWidth;
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height = window.innerHeight || document.documentElement.clientHeight;
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if (canvas) {
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canvas.width = width;
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canvas.height = height;
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}
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});
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let particles = [];
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let wind = [0, 0];
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let cursor = [0, 0];
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function velocity(r) {
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return 70 / r + 30;
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}
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function sine_component(h, a) {
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return [2 * Math.PI / h, Math.random() * a, Math.random() * 2 * Math.PI]; // [frequency, amplitude, phase]
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}
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function calc_sine(components, x) {
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let sum = 0;
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for (let i = 0; i < components.length; i++) {
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const [f, a, p] = components[i];
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sum += Math.sin(x * f + p) * a;
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}
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return sum;
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}
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function gen_particle() {
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let r = Math.random() * 4 + 1;
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return {
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radius: r,
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x: Math.random() * width,
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y: -r,
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opacity: Math.random(),
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sine_components: [sine_component(height, 3), sine_component(height / 2, 2), sine_component(height / 5, 1), sine_component(height / 10, 0.5)],
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};
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}
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function update_pos(dt) {
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const n = particles.length;
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for (let i = 0; i < n; i++) {
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const v = velocity(particles[i].radius);
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particles[i].x += calc_sine(particles[i].sine_components, particles[i].y) * v / 5 * dt;
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particles[i].y += v * dt;
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// const dist = Math.hypot(particles[i].x - cursor[0], particles[i].y - cursor[1]) + 1;
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// particles[i].x += wind[0] * dt / dist
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// particles[i].y += wind[1] * dt / dist;
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if (particles[i].y - particles[i].radius > height) {
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particles[i] = gen_particle();
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}
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}
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}
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let context_cache;
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function get_context() {
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if (context_cache)
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return context_cache;
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canvas = document.createElement('canvas');
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canvas.id = 'snow-canvas';
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canvas.width = width;
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canvas.height = height;
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canvas.style = 'position: fixed; top: 0; left: 0; overflow: hidden; pointer-events: none; z-index: 256;';
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if ((document.documentElement.dataset.darkreaderMode || "").startsWith('filter'))
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canvas.style.filter = 'invert(1)';
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document.body.appendChild(canvas);
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context_cache = canvas.getContext('2d');
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return context_cache;
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}
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function draw() {
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const ctx = get_context();
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ctx.clearRect(0, 0, width, height);
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const n = particles.length;
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for (let i = 0; i < n; i++) {
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const p = particles[i];
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ctx.fillStyle = `rgba(255, 255, 255, ${p.opacity})`;
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ctx.shadowColor = '#80EDF7';
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ctx.shadowBlur = 7;
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ctx.beginPath();
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ctx.arc(p.x, p.y, p.radius, 0, 2*Math.PI);
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ctx.fill();
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}
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}
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let focused = true;
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let disabled = false;
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let lastTime = performance.now();
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const requestFrame = () => setTimeout(loop, mspf);
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function loop() {
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const dt = (performance.now() - lastTime) / 1000;
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if (particles.length < 120 && Math.random() < 0.1) {
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particles.push(gen_particle());
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}
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update_pos(dt);
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draw();
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lastTime = performance.now();
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if (focused && !disabled)
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requestFrame();
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}
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window.addEventListener('focus', () => {
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console.log('snow start');
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focused = true;
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lastTime = performance.now();
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requestFrame();
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});
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window.addEventListener('blur', () => {
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console.log('snow stop');
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focused = false;
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});
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window.addEventListener('keydown', e => {
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if (e.ctrlKey && e.key == 's') {
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e.preventDefault();
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disabled = !disabled;
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if (disabled) {
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canvas.style.display = 'none';
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} else {
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canvas.style.display = 'block';
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lastTime = performance.now();
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requestFrame();
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}
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}
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});
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requestFrame();
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//雪花
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```
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***
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## 樱花🌸
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```js
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//樱花
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Sakura.prototype.draw = function (cxt) {
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cxt.save(); var xc = 40 * this.s / 4; cxt.translate(this.x, this.y); cxt.rotate(this.r); cxt.drawImage(img, 0, 0, 40 * this.s, 40 * this.s)
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cxt.restore();
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}
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Sakura.prototype.update = function () { this.x = this.fn.x(this.x, this.y); this.y = this.fn.y(this.y, this.y); this.r = this.fn.r(this.r); if (this.x > window.innerWidth || this.x < 0 || this.y > window.innerHeight || this.y < 0) { this.r = getRandom('fnr'); if (Math.random() > 0.4) { this.x = getRandom('x'); this.y = 0; this.s = getRandom('s'); this.r = getRandom('r'); } else { this.x = window.innerWidth; this.y = getRandom('y'); this.s = getRandom('s'); this.r = getRandom('r'); } } }
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SakuraList = function () { this.list = []; }
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SakuraList.prototype.push = function (sakura) { this.list.push(sakura); }
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SakuraList.prototype.update = function () { for (var i = 0, len = this.list.length; i < len; i++) { this.list[i].update(); } }
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SakuraList.prototype.draw = function (cxt) { for (var i = 0, len = this.list.length; i < len; i++) { this.list[i].draw(cxt); } }
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SakuraList.prototype.get = function (i) { return this.list[i]; }
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SakuraList.prototype.size = function () { return this.list.length; }
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function getRandom(option) {
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var ret, random; switch (option) {
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case 'x': ret = Math.random() * window.innerWidth; break; case 'y': ret = Math.random() * window.innerHeight; break; case 's': ret = Math.random(); break; case 'r': ret = Math.random() * 6; break; case 'fnx': random = -0.5 + Math.random() * 1; ret = function (x, y) { return x + 0.5 * random - 1.7; }; break; case 'fny': random = 1.5 + Math.random() * 0.7
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ret = function (x, y) { return y + random; }; break; case 'fnr': random = Math.random() * 0.03; ret = function (r) { return r + random; }; break;
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}
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return ret;
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}
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function startSakura() {
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requestAnimationFrame = window.requestAnimationFrame || window.mozRequestAnimationFrame || window.webkitRequestAnimationFrame || window.msRequestAnimationFrame || window.oRequestAnimationFrame; var canvas = document.createElement('canvas'), cxt; staticx = true; canvas.height = window.innerHeight; canvas.width = window.innerWidth; canvas.setAttribute('style', 'position: fixed;left: 0;top: 0;pointer-events: none;'); canvas.setAttribute('id', 'canvas_sakura'); document.getElementsByTagName('body')[0].appendChild(canvas); cxt = canvas.getContext('2d'); var sakuraList = new SakuraList(); for (var i = 0; i < 50; i++) { var sakura, randomX, randomY, randomS, randomR, randomFnx, randomFny; randomX = getRandom('x'); randomY = getRandom('y'); randomR = getRandom('r'); randomS = getRandom('s'); randomFnx = getRandom('fnx'); randomFny = getRandom('fny'); randomFnR = getRandom('fnr'); sakura = new Sakura(randomX, randomY, randomS, randomR, { x: randomFnx, y: randomFny, r: randomFnR }); sakura.draw(cxt); sakuraList.push(sakura); }
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stop = requestAnimationFrame(function () { cxt.clearRect(0, 0, canvas.width, canvas.height); sakuraList.update(); sakuraList.draw(cxt); stop = requestAnimationFrame(arguments.callee); })
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}
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window.onresize = function () { var canvasSnow = document.getElementById('canvas_snow'); }
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img.onload = function () { startSakura(); }
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//樱花
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```
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## 线条
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```js
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!function() {
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function o(w, v, i) {
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return w.getAttribute(v) || i
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}
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function j(i) {
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return document.getElementsByTagName(i)
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}
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function l() {
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var i = j("script"),
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w = i.length,
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v = i[w - 1];
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return {
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l: w,
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z: o(v, "zIndex", -1),
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o: o(v, "opacity", 0.5),
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c: o(v, "color", "0,0,0"),
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n: o(v, "count", 99)
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}
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}
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function k() {
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r = u.width = window.innerWidth || document.documentElement.clientWidth || document.body.clientWidth,
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n = u.height = window.innerHeight || document.documentElement.clientHeight || document.body.clientHeight
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}
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function b() {
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e.clearRect(0, 0, r, n);
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var w = [f].concat(t);
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var x, v, A, B, z, y;
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t.forEach(function(i) {
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i.x += i.xa,
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i.y += i.ya,
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i.xa *= i.x > r || i.x < 0 ? -1 : 1,
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i.ya *= i.y > n || i.y < 0 ? -1 : 1,
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e.fillRect(i.x - 0.5, i.y - 0.5, 1, 1);
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for (v = 0; v < w.length; v++) {
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x = w[v];
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if (i !== x && null !== x.x && null !== x.y) {
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B = i.x - x.x,
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z = i.y - x.y,
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y = B * B + z * z;
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y < x.max && (x === f && y >= x.max / 2 && (i.x -= 0.03 * B, i.y -= 0.03 * z), A = (x.max - y) / x.max, e.beginPath(), e.lineWidth = A / 2, e.strokeStyle = "rgba(" + s.c + "," + (A + 0.2) + ")", e.moveTo(i.x, i.y), e.lineTo(x.x, x.y), e.stroke())
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}
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}
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w.splice(w.indexOf(i), 1)
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}),
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m(b)
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}
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var u = document.createElement("canvas"),
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s = l(),
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c = "c_n" + s.l,
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e = u.getContext("2d"),
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r,
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n,
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m = window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame || window.oRequestAnimationFrame || window.msRequestAnimationFrame ||
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function(i) {
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window.setTimeout(i, 1000 / 45)
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},
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a = Math.random,
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f = {
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x: null,
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y: null,
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max: 20000
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};
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u.id = c;
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u.style.cssText = "position:fixed;top:0;left:0;z-index:" + s.z + ";opacity:" + s.o;
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j("body")[0].appendChild(u);
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k(),
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window.onresize = k;
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window.onmousemove = function(i) {
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i = i || window.event,
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f.x = i.clientX,
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f.y = i.clientY
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},
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window.onmouseout = function() {
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f.x = null,
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f.y = null
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};
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for (var t = [], p = 0; s.n > p; p++) {
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var h = a() * r,
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g = a() * n,
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q = 2 * a() - 1,
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d = 2 * a() - 1;
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t.push({
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x: h,
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y: g,
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xa: q,
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ya: d,
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max: 6000
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})
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}
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setTimeout(function() {
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b()
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},
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100)
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} ();
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```
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## 粒子
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```js
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/*背景*/
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window.onload = function () {
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//定义body的margin由默认值8px->0px
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document.body.style.margin = "0";
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document.body.style.background = "255,255,255";
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//创建canvas画布
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document.body.appendChild(document.createElement('canvas'));
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var canvas = document.querySelector('canvas'),
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ctx = canvas.getContext('2d') //ctx返回一个在canvas上画图的api/dom
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canvas.width = window.innerWidth;
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canvas.height = window.innerHeight;
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canvas.style.position = 'fixed';
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ctx.lineWidth = .3;
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ctx.strokeStyle = (new Color(150)).style;
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//定义鼠标覆盖范围
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var mousePosition = {
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x: 30 * canvas.width / 100,
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y: 30 * canvas.height / 100
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};
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var dots = {
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nb: 1000,//Dot的总数
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distance: 50,
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d_radius: 100,
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array: []
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};
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//创建颜色类，Color类返回字符串型rgba（*,*,*,.8）
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function mixComponents(comp1, weight1, comp2, weight2) {
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return (comp1 * weight1 + comp2 * weight2) / (weight1 + weight2);
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}
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function averageColorStyles(dot1, dot2) {
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var color1 = dot1.color,
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color2 = dot2.color;
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var r = mixComponents(color1.r, dot1.radius, color2.r, dot2.radius),
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g = mixComponents(color1.g, dot1.radius, color2.g, dot2.radius),
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b = mixComponents(color1.b, dot1.radius, color2.b, dot2.radius);
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return createColorStyle(Math.floor(r), Math.floor(g), Math.floor(b));
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}
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function colorValue(min) {
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return Math.floor(Math.random() * 255 + min);
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}
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function createColorStyle(r, g, b) {
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return 'rgba(' + r + ',' + g + ',' + b + ', 0.8)';
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}
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function Color(min) {
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min = min || 0;
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this.r = colorValue(min);
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this.g = colorValue(min);
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this.b = colorValue(min);
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this.style = createColorStyle(this.r, this.g, this.b);
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}
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//创建Dot类以及一系列方法
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function Dot() {
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this.x = Math.random() * canvas.width;
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this.y = Math.random() * canvas.height;
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this.vx = -.5 + Math.random();
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this.vy = -.5 + Math.random();
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this.radius = Math.random() * 2;
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this.color = new Color();
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}
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Dot.prototype = {
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draw: function () {
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ctx.beginPath();
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ctx.fillStyle = this.color.style;
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ctx.arc(this.x, this.y, this.radius, 0, Math.PI * 2, false);
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ctx.fill();
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}
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};
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function moveDots() {//Dot对象的移动
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for (i = 0; i < dots.nb; i++) {
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var dot = dots.array[i];
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if (dot.y < 0 || dot.y > canvas.height) {
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dot.vx = dot.vx;
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dot.vy = - dot.vy;
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}
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else if (dot.x < 0 || dot.x > canvas.width) {
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dot.vx = - dot.vx;
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dot.vy = dot.vy;
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}
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dot.x += dot.vx;
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dot.y += dot.vy;
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}
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}
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function connectDots() {//DOt对象的连接
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for (i = 0; i < dots.nb; i++) {
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for (j = i; j < dots.nb; j++) {
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i_dot = dots.array[i];
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j_dot = dots.array[j];
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if ((i_dot.x - j_dot.x) < dots.distance && (i_dot.y - j_dot.y) < dots.distance && (i_dot.x - j_dot.x) > - dots.distance && (i_dot.y - j_dot.y) > - dots.distance) {
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if ((i_dot.x - mousePosition.x) < dots.d_radius && (i_dot.y - mousePosition.y) < dots.d_radius && (i_dot.x - mousePosition.x) > - dots.d_radius && (i_dot.y - mousePosition.y) > - dots.d_radius) {
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ctx.beginPath();
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ctx.strokeStyle = averageColorStyles(i_dot, j_dot);
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ctx.moveTo(i_dot.x, i_dot.y);
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ctx.lineTo(j_dot.x, j_dot.y);
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ctx.stroke();//绘制定义的路线
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ctx.closePath();//创建从当前点回到起始点的路径
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}
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}
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}
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}
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}
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function createDots() {//创建nb个Dot对象
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for (i = 0; i < dots.nb; i++) {
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dots.array.push(new Dot());
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}
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}
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function drawDots() {//引用Dot原型链，使用draw方法，在canvas上画出Dot对象
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for (i = 0; i < dots.nb; i++) {
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var dot = dots.array[i];
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dot.draw();
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}
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}
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function animateDots() {
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ctx.clearRect(0, 0, canvas.width, canvas.height);//清除画布，否则线条会连在一起
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moveDots();
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connectDots();
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drawDots();
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requestAnimationFrame(animateDots);
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}
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createDots();//使用创建Dot类函数
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requestAnimationFrame(animateDots);//使用canvas独有的60Hz刷新屏幕画布的方法
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document.querySelector('canvas').addEventListener('mousemove', function (e) {
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mousePosition.x = e.pageX;
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mousePosition.y = e.pageY;
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})
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document.querySelector('canvas').addEventListener('mouseleave', function (e) {//鼠标离开时，连接自动返回到画布中心
|
||
mousePosition.x = canvas.width / 2;
|
||
mousePosition.y = canvas.height / 2;
|
||
})
|
||
|
||
}
|
||
|
||
/*背景end*/
|
||
``` |