HTML5 canvas 240行代码实现粒子漩涡特效

<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>H5,200行代码实现粒子漩涡特效</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>
</body>
</html>

HTML5 canvas 240行代码实现粒子漩涡特效相关推荐

H5,200行代码实现粒子漩涡特效
演示图实例代码 <!doctype html> <html> <head> <meta charset="utf-8"> < ...
html 粒子漩涡特效代码（实例）
<!doctype html> <html> <head><meta charset="utf-8"><title>H5 ...
HTML5 Canvas爱心时钟代码
这是一款数字时钟动画,数字又多个小爱心组成,又何问起整理,随着时间推进,每一秒钟新数字替换旧数字,旧数字离去使用天女散花动画,花是五颜六色的. 查看效果: http://hovertree.com/t ...
html5实现安卓的手写功能,html5 canvas手写字代码(兼容手机端)(示例代码)
html5 canvas手写字代码(兼容手机端) 画板实验清空生成图片 var canvas,board,img; canvas = document.getElementById('myCan ...
html 星空效果,html5 canvas炫酷旋转银河系星空背景特效
这是一款html5 canvas炫酷旋转银河系星空背景特效.该特效通过canvas来绘制银河系星盘,并制作星系旋转的效果,非常炫酷. 使用方法 HTML结构该旋转银河系星空背景特效的HTML结果只需 ...
HTML5+Canvas漂亮的3D烟花动画生日特效，节日特效，烟花
fireworks HTML5+Canvas漂亮的3D烟花动画生日特效,节日特效,烟花 https://github.com/louislivi/fireworks
html5 canvas酷炫3D背景打开动画特效
html5 canvas酷炫3D背景打开动画特效点击跳转到演示地址点击进入资源下载地址
html5刮彩效果,HTML5 Canvas炫酷彩虹色波浪线动画特效代码
效果图 JS源码 var c = document.querySelector('.c') , w , h , ctx = c.getContext('2d') , x0, y0, x, y, t = ...
html 穿越星空效果,html5 canvas绚丽3d星空飞行穿梭动画特效
简要教程这是一款使用 html5 canvas和 jQuery 制作的绚丽3d星空飞行穿梭动画特效.该3d星空飞行特效模拟了飞船在宇宙星空中快速穿梭的动画场景,效果非常逼真. HTML结构 HTML ...

HTML5 canvas 240行代码实现粒子漩涡特效

HTML5 canvas 240行代码实现粒子漩涡特效相关推荐

最新文章

热门文章