js实现3D粒子酷炫动态旋转特效

程序员文章站 2022-06-22 14:33:04

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（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 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>

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