我要评论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 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 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=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移动技术网。
如您对本文有疑问或者有任何想说的，请点击进行留言回复，万千网友为您解惑！
网友评论