由 dawei
短视频，自媒体，达人种草一站服务
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
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<TITLE> New Document </TITLE>
<META CONTENT="EditPlus">
<META CONTENT="">
<META CONTENT="">
<META 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></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){