使用JavaScript实现动态旋转的酷炫3D粒子效果

这篇文章主要为大家详细介绍了js实现3D粒子酷炫动态旋转特效，文中示例代码介绍的非常详细，具有一定的参考价值，感兴趣的小伙伴们可以参考一下

js实现3D粒子酷炫动态旋转特效（效果比较酷炫，中途不仅有形态的变换，还有颜色的变化，希望大家能够喜欢）

代码实现过程中的静态截图

js实现3D粒子酷炫动态旋转特效

<!DOCTYPE HTML PUBLIC “-//W3C//DTD HTML 4.0 Transitional//EN”>

<HTML>
<HEAD>
<TITLE> New Document </TITLE>
<META NAME=”Generator” CONTENT=”EditPlus”>
<META NAME=”Author” CONTENT=””>
<META NAME=”Keywords” CONTENT=””>
<META NAME=”Description” CONTENT=””>
<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 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=2000;
vars.initV=.01;
vars.distributionRadius=800;
vars.vortexHeight=25;
}

vars.frameNo++;
requestAnimationFrame(function() {
frame(vars);
});

process(vars);
draw(vars);
}
frame();

</script>
</BODY>
</HTML>

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持脚本之家。

chatGPT

近期文章

互联网技术 · 2024年2月16日

使用JavaScript实现动态旋转的酷炫3D粒子效果

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