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粒子特效
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>H5,200行代碼實現粒子漩渦特效</title>
<style>
html,body{
margin:0px;
width:100%;
height:100%;
overflow:hidden;
background:#000;
}
#canvas{
position:absolute;
width:100%;
height:100%;
}
</style>
</head>
<body>
<canvas id="canvas"></canvas>
<script>
function project3D(x,y,z,vars){
var p,d;
x-=vars.camX;
y-=vars.camY-8;
z-=vars.camZ;
p=Math.atan2(x,z);
d=Math.sqrt(x*x+z*z);
x=Math.sin(p-vars.yaw)*d;
z=Math.cos(p-vars.yaw)*d;
p=Math.atan2(y,z);
d=Math.sqrt(y*y+z*z);
y=Math.sin(p-vars.pitch)*d;
z=Math.cos(p-vars.pitch)*d;
var rx1=-1000;
var ry1=1;
var rx2=1000;
var ry2=1;
var rx3=0;
var ry3=0;
var rx4=x;
var ry4=z;
var uc=(ry4-ry3)*(rx2-rx1)-(rx4-rx3)*(ry2-ry1);
var ua=((rx4-rx3)*(ry1-ry3)-(ry4-ry3)*(rx1-rx3))/uc;
var ub=((rx2-rx1)*(ry1-ry3)-(ry2-ry1)*(rx1-rx3))/uc;
if(!z)z=0.000000001;
if(ua>0&&ua<1&&ub>0&&ub<1){
return {
x:vars.cx+(rx1+ua*(rx2-rx1))*vars.scale,
y:vars.cy+y/z*vars.scale,
d:(x*x+y*y+z*z)
};
}else{
return { d:-1 };
}
}
function elevation(x,y,z){
var dist = Math.sqrt(x*x+y*y+z*z);
if(dist && z/dist>=-1 && z/dist <=1) return Math.acos(z / dist);
return 0.00000001;
}
function rgb(col){
col += 0.000001;
var r = parseInt((0.5+Math.sin(col)*0.5)*16);
var g = parseInt((0.5+Math.cos(col)*0.5)*16);
var b = parseInt((0.5-Math.sin(col)*0.5)*16);
return "#"+r.toString(16)+g.toString(16)+b.toString(16);
}
function interpolateColors(RGB1,RGB2,degree){
var w2=degree;
var w1=1-w2;
return [w1*RGB1[0]+w2*RGB2[0],w1*RGB1[1]+w2*RGB2[1],w1*RGB1[2]+w2*RGB2[2]];
}
function rgbArray(col){
col += 0.000001;
var r = parseInt((0.5+Math.sin(col)*0.5)*256);
var g = parseInt((0.5+Math.cos(col)*0.5)*256);
var b = parseInt((0.5-Math.sin(col)*0.5)*256);
return [r, g, b];
}
function colorString(arr){
var r = parseInt(arr[0]);
var g = parseInt(arr[1]);
var b = parseInt(arr[2]);
return "#"+("0" + r.toString(16) ).slice (-2)+("0" + g.toString(16) ).slice (-2)+("0" + b.toString(16) ).slice (-2);
}
function process(vars){
if(vars.points.length<vars.initParticles) for(var i=0;i<5;++i) spawnParticle(vars);
var p,d,t;
p = Math.atan2(vars.camX, vars.camZ);
d = Math.sqrt(vars.camX * vars.camX + vars.camZ * vars.camZ);
d -= Math.sin(vars.frameNo / 80) / 25;
t = Math.cos(vars.frameNo / 300) / 165;
vars.camX = Math.sin(p + t) * d;
vars.camZ = Math.cos(p + t) * d;
vars.camY = -Math.sin(vars.frameNo / 220) * 15;
vars.yaw = Math.PI + p + t;
vars.pitch = elevation(vars.camX, vars.camZ, vars.camY) - Math.PI / 2;
var t;
for(var i=0;i<vars.points.length;++i){
x=vars.points[i].x;
y=vars.points[i].y;
z=vars.points[i].z;
d=Math.sqrt(x*x+z*z)/1.0075;
t=.1/(1+d*d/5);
p=Math.atan2(x,z)+t;
vars.points[i].x=Math.sin(p)*d;
vars.points[i].z=Math.cos(p)*d;
vars.points[i].y+=vars.points[i].vy*t*((Math.sqrt(vars.distributionRadius)-d)*2);
if(vars.points[i].y>vars.vortexHeight/2 || d<.25){
vars.points.splice(i,1);
spawnParticle(vars);
}
}
}
function drawFloor(vars){
var x,y,z,d,point,a;
for (var i = -25; i <= 25; i += 1) {
for (var j = -25; j <= 25; j += 1) {
x = i*2;
z = j*2;
y = vars.floor;
d = Math.sqrt(x * x + z * z);
point = project3D(x, y-d*d/85, z, vars);
if (point.d != -1) {
size = 1 + 15000 / (1 + point.d);
a = 0.15 - Math.pow(d / 50, 4) * 0.15;
if (a > 0) {
vars.ctx.fillStyle = colorString(interpolateColors(rgbArray(d/26-vars.frameNo/40),[0,128,32],.5+Math.sin(d/6-vars.frameNo/8)/2));
vars.ctx.globalAlpha = a;
vars.ctx.fillRect(point.x-size/2,point.y-size/2,size,size);
}
}
}
}
vars.ctx.fillStyle = "#82f";
for (var i = -25; i <= 25; i += 1) {
for (var j = -25; j <= 25; j += 1) {
x = i*2;
z = j*2;
y = -vars.floor;
d = Math.sqrt(x * x + z * z);
point = project3D(x, y+d*d/85, z, vars);
if (point.d != -1) {
size = 1 + 15000 / (1 + point.d);
a = 0.15 - Math.pow(d / 50, 4) * 0.15;
if (a > 0) {
vars.ctx.fillStyle = colorString(interpolateColors(rgbArray(-d/26-vars.frameNo/40),[32,0,128],.5+Math.sin(-d/6-vars.frameNo/8)/2));
vars.ctx.globalAlpha = a;
vars.ctx.fillRect(point.x-size/2,point.y-size/2,size,size);
}
}
}
}
}
function sortFunction(a,b){
return b.dist-a.dist;
}
function draw(vars){
vars.ctx.globalAlpha=.15;
vars.ctx.fillStyle="#000";
vars.ctx.fillRect(0, 0, canvas.width, canvas.height);
drawFloor(vars);
var point,x,y,z,a;
for(var i=0;i<vars.points.length;++i){
x=vars.points[i].x;
y=vars.points[i].y;
z=vars.points[i].z;
point=project3D(x,y,z,vars);
if(point.d != -1){
vars.points[i].dist=point.d;
size=1+vars.points[i].radius/(1+point.d);
d=Math.abs(vars.points[i].y);
a = .8 - Math.pow(d / (vars.vortexHeight/2), 1000) * .8;
vars.ctx.globalAlpha=a>=0&&a<=1?a:0;
vars.ctx.fillStyle=rgb(vars.points[i].color);
if(point.x>-1&&point.x<vars.canvas.width&&point.y>-1&&point.y<vars.canvas.height)vars.ctx.fillRect(point.x-size/2,point.y-size/2,size,size);
}
}
vars.points.sort(sortFunction);
}
function spawnParticle(vars){
var p,ls;
pt={};
p=Math.PI*2*Math.random();
ls=Math.sqrt(Math.random()*vars.distributionRadius);
pt.x=Math.sin(p)*ls;
pt.y=-vars.vortexHeight/2;
pt.vy=vars.initV/20+Math.random()*vars.initV;
pt.z=Math.cos(p)*ls;
pt.radius=200+800*Math.random();
pt.color=pt.radius/1000+vars.frameNo/250;
vars.points.push(pt);
}
function frame(vars) {
if(vars === undefined){
var vars={};
vars.canvas = document.querySelector("canvas");
vars.ctx = vars.canvas.getContext("2d");
vars.canvas.width = document.body.clientWidth;
vars.canvas.height = document.body.clientHeight;
window.addEventListener("resize", function(){
vars.canvas.width = document.body.clientWidth;
vars.canvas.height = document.body.clientHeight;
vars.cx=vars.canvas.width/2;
vars.cy=vars.canvas.height/2;
}, true);
vars.frameNo=0;
vars.camX = 0;
vars.camY = 0;
vars.camZ = -14;
vars.pitch = elevation(vars.camX, vars.camZ, vars.camY) - Math.PI / 2;
vars.yaw = 0;
vars.cx=vars.canvas.width/2;
vars.cy=vars.canvas.height/2;
vars.bounding=10;
vars.scale=500;
vars.floor=26.5;
vars.points=[];
vars.initParticles=700;
vars.initV=.01;
vars.distributionRadius=800;
vars.vortexHeight=25;
}
vars.frameNo++;
requestAnimationFrame(function() {
frame(vars);
});
process(vars);
draw(vars);
}
frame();
</script>
<div class="introduce_item">
<img class="introduce_item_img" src="./img/imgs14.jpg" alt="">
</div>
</body>
</html>
黑客帝國
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<style>
body {
margin: 0;
padding: 0;
}
canvas {
width: 100%;
height: 100%;
}
</style>
</head>
<body>
<canvas style="background:#111"></canvas>
<script>
//獲取畫布對象
var can = document.querySelector("canvas");
//獲取畫布的上下文
var ctx = can.getContext("2d");
//設置canvas的寬度和高度
can.width = window.innerWidth;
can.height = window.innerHeight;
//每個文字的字體大小
var fontSize = 16;
//計算列
var colunms = Math.floor(window.innerWidth / fontSize);
//記錄每列文字的y軸座標
var arr = [];
//給每一個文字初始化一個起始點的位置
for (var i = 0; i < colunms; i++) {
arr.push(0);
}
//運動的文字
var str = "you are a silly";
//繪畫的函數
function draw() {
//佈滿全屏的黑色遮罩層
ctx.fillStyle = "rgba(0,0,0,0.05)";
ctx.fillRect(0, 0, window.innerWidth, window.innerHeight);
//給字體設置樣式
ctx.font = "700 " + fontSize + "px 微軟雅黑";
//給字體添加顏色
ctx.fillStyle = "#00cc33";
//寫入畫布中
for (var i = 0; i < colunms; i++) {
var index = Math.floor(Math.random() * str.length);
var x = i * fontSize;
var y = arr[i] * fontSize;
ctx.fillText(str[index], x, y);
//如果文字的Y軸座標大於畫布的高度，1/100*colunms概率將該文字的Y軸座標重置爲0
if (y >= can.height && Math.random() > 0.99) {
arr[i] = 0;
}
//文字Y軸座標+1
arr[i]++;
}
}
draw();
setInterval(draw, 30);
</script>
</body>
</html>
3d旋轉圖
index.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<meta http-equiv="X-UA-Compatible" content="ie=edge" />
<link rel="stylesheet" href="style.css" />
<title>Document</title>
</head>
<body>
<main>
<div class="cube">
<div class="img1"></div>
<div class="img2"></div>
<div class="img3"></div>
<div class="img4"></div>
<div class="img5"></div>
<div class="img6"></div>
</div>
</main>
</body>
</html>
style.css
html,
body {
margin: 0;
font-family: Helvetica, "PingFang SC", "Microsoft Yahei", sans-serif;
}
* {
box-sizing: border-box;
}
html {
/* 需隱藏最外層不可見區域以使視差生效 */
overflow: hidden;
}
body {
/* 開啓3d空間，數值越小3D效果越大 */
perspective: 1px;
/* 在3D空間進行transform */
transform-style: preserve-3d;
overflow-x: hidden;
overflow-y: auto;
/* 需要設置高度以使時差生效 */
height: 100vh;
}
header {
display: flex;
align-items: center;
justify-content: center;
position: relative;
transform-style: inherit;
/* 需要設置高度以使時差生效 */
height: 100vh;
}
header h1 {
background-color: rgba(0, 0, 0, 0.7);
color: white;
padding: 1em 4em;
font-size: 3em;
}
header::before {
position: absolute;
content: "";
display: block;
top: 0;
bottom: 0;
left: 0;
right: 0;
background-image: url(https://images.pexels.com/photos/2310815/pexels-photo-2310815.jpeg?cs=srgb&dl=photo-of-opened-metal-windows-2310815.jpg&fm=jpg);
background-size: cover;
/* 核心，按z軸向遠處移動1px，大小會縮小一倍，使用scale放大到原圖大小 */
transform: translateZ(-1px) scale(2);
z-index: -1;
}
main {
display: flex;
justify-content: center;
position: relative;
background-color: #222f3e;
}
article {
width: 90vw;
max-width: 960px;
padding: 6em 0;
color: white;
font-size: 18px;
text-align: justify;
letter-spacing: 0.075em;
text-indent: 2em;
line-height: 1.8em;
}
/* 屏幕適配 */
@media screen and (max-width: 1024px) {
header h1 {
font-size: 2.5em;
padding: 1em 1.5em;
}
}
@media screen and (max-width: 600px) {
header h1 {
font-size: 1.5em;
padding: 1em 1em;
}
article {
font-size: 1em;
}
}
