动易网站cms,漳州城乡和建设局网站首页,wordpress去除版权,常德论坛网模仿下雨的特效#xff0c;雨点从空中随机飘落。
这个特效使用了H5的新特性Canvas。
效果演示 代码展示
body代码
!DOCTYPE html
html langen
head
meta charsetUTF-8
titleH5 Canvas下雨特效/titl…模仿下雨的特效雨点从空中随机飘落。
这个特效使用了H5的新特性Canvas。
效果演示 代码展示
body代码
!DOCTYPE html
html langen
head
meta charsetUTF-8
titleH5 Canvas下雨特效/titlelink relstylesheet hrefcss/style.css/head
bodycanvas idrain/canvas/body
script srcjs/script.js/script
/html
css样式代码
html,body{padding: 0px;margin: 0px;height: 100%;overflow: hidden;background: black;font-family: Gayathri, sans-serif;
}#rain{position: absolute;left: 0px;top: 0px;user-select: none;
}media only screen and (max-width: 600px) {.raindrop:nth-child(3) {display: none;}
}js代码
var c document.getElementById(rain);c.width window.innerWidth;
c.height window.innerHeight;var ctx c.getContext(2d);let rainDrops [];
let elements document.getElementsByClassName(raindrop);
let length 30;
let speed 15;let angle 90 * Math.PI / 180;
let angleSin Math.sin(angle);
let angleCos Math.cos(angle);let spawnInterval setInterval(newDrop, 50);window.addEventListener(resize, onResize);document.addEventListener(visibilitychange, function() {if (document.hidden) {clearInterval(spawnInterval);} else {spawnInterval setInterval(newDrop, 50);}
});function RainDrop(x, y, angle) {this.x x;this.y y;rainDrops.push(this);
}function newDrop() {for (let x 0; x 50; x) {new RainDrop(Math.random() * c.width, -40 - 100 * Math.random(), angle);}
}update();function update() {for (let x 0; x rainDrops.length; x) {let drop rainDrops[x];drop.x speed * angleCos;drop.y speed * angleSin;drop.endX drop.x length * angleCos;drop.endY drop.y length * angleSin;if (drop.y c.height) {rainDrops.splice(x, 1);x--;}}draw();
}function draw() {ctx.clearRect(0, 0, c.width, c.height);ctx.lineWidth 1;ctx.lineCap round;ctx.strokeStyle #0984e3;let gradient ctx.createLinearGradient(0, 0, 0, c.height);gradient.addColorStop(0, #00a8ff);gradient.addColorStop(0.6, #00a8ff);gradient.addColorStop(1, white);ctx.strokeStyle gradient;ctx.beginPath();for (let i 0; i rainDrops.length; i) {ctx.moveTo(Math.floor(rainDrops[i].x), Math.floor(rainDrops[i].y));ctx.lineTo(Math.floor(rainDrops[i].endX), Math.floor(rainDrops[i].endY));}ctx.stroke();clearRegions();window.requestAnimationFrame(update);
}function onResize() {c.width window.innerWidth;c.height window.innerHeight;
}function clearRegions() {ctx.globalCompositeOperation destination-out;for (let i 0; i elements.length; i) {let boundingBox elements[i].getBoundingClientRect();let yDistanceBottom c.height - boundingBox.bottom;let yDistanceTop c.height - boundingBox.top;let bottomLeftX boundingBox.left yDistanceBottom * Math.tan(Math.PI / 2 - angle);let bottomRightX boundingBox.right yDistanceBottom * Math.tan(Math.PI / 2 - angle);let bottomLeftX2 boundingBox.left yDistanceTop * Math.tan(Math.PI / 2 - angle);let bottomRightX2 boundingBox.right yDistanceTop * Math.tan(Math.PI / 2 - angle);ctx.beginPath();ctx.moveTo(boundingBox.left, boundingBox.bottom);ctx.lineTo(bottomLeftX, c.height);ctx.lineTo(bottomRightX, c.height);ctx.lineTo(boundingBox.right, boundingBox.bottom);ctx.closePath();ctx.fill();ctx.beginPath();ctx.moveTo(boundingBox.left, boundingBox.top);ctx.lineTo(bottomLeftX2, c.height);ctx.lineTo(bottomRightX2, c.height);ctx.lineTo(boundingBox.right, boundingBox.top);ctx.closePath();ctx.fill();}ctx.globalCompositeOperation source-over;
}程序到此结束快实现属于我的雨滴特效吧
