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一：粒子成果
<html>
<head>
<meta charset="utf-8">
<title>www.husonghe.com</title>
<style>
html {
height: 100%;
background-image: -webkit-radial-gradient(ellipse farthest-corner at center center, #1b44e4 0%, #020f3a 100%);
background-image: radial-gradient(ellipse farthest-corner at center center, #1b44e4 0%, #020f3a 100%);
cursor: move;
}
body {
width: 100%;
margin: 0;
overflow: hidden;
}
</style>
</head>
<body>
<canvas id="canv" width="1920" height="572"></canvas>
<script>
var num = 200;
var w = window.innerWidth;
var h = window.innerHeight;
var max = 100;
var _x = 0;
var _y = 0;
var _z = 150;
var dtr = function (d) {return d * Math.PI / 180;};
var rnd = function () {return Math.sin(Math.floor(Math.random() * 360) * Math.PI / 180);
};
var dist = function (p1, p2, p3) {return Math.sqrt(Math.pow(p2.x - p1.x, 2) + Math.pow(p2.y - p1.y, 2) + Math.pow(p2.z - p1.z, 2));
};
var cam = {
obj: {
x: _x,
y: _y,
z: _z
},
dest: {
x: 0,
y: 0,
z: 1
},
dist: {
x: 0,
y: 0,
z: 200
},
ang: {
cplane: 0,
splane: 0,
ctheta: 0,
stheta: 0
},
zoom: 1,
disp: {
x: w / 2,
y: h / 2,
z: 0
},
upd: function () {
cam.dist.x = cam.dest.x - cam.obj.x;
cam.dist.y = cam.dest.y - cam.obj.y;
cam.dist.z = cam.dest.z - cam.obj.z;
cam.ang.cplane = -cam.dist.z / Math.sqrt(cam.dist.x * cam.dist.x + cam.dist.z * cam.dist.z);
cam.ang.splane = cam.dist.x / Math.sqrt(cam.dist.x * cam.dist.x + cam.dist.z * cam.dist.z);
cam.ang.ctheta = Math.sqrt(cam.dist.x * cam.dist.x + cam.dist.z * cam.dist.z) / Math.sqrt(cam.dist.x * cam.dist.x + cam.dist.y * cam.dist.y + cam.dist.z * cam.dist.z);
cam.ang.stheta = -cam.dist.y / Math.sqrt(cam.dist.x * cam.dist.x + cam.dist.y * cam.dist.y + cam.dist.z * cam.dist.z);
}
};
var trans = {
parts: {sz: function (p, sz) {
return {
x: p.x * sz.x,
y: p.y * sz.y,
z: p.z * sz.z
};
},
rot: {x: function (p, rot) {
return {
x: p.x,
y: p.y * Math.cos(dtr(rot.x)) - p.z * Math.sin(dtr(rot.x)),
z: p.y * Math.sin(dtr(rot.x)) + p.z * Math.cos(dtr(rot.x))
};
},
y: function (p, rot) {
return {x: p.x * Math.cos(dtr(rot.y)) + p.z * Math.sin(dtr(rot.y)),
y: p.y,
z: -p.x * Math.sin(dtr(rot.y)) + p.z * Math.cos(dtr(rot.y))
};
},
z: function (p, rot) {
return {x: p.x * Math.cos(dtr(rot.z)) - p.y * Math.sin(dtr(rot.z)),
y: p.x * Math.sin(dtr(rot.z)) + p.y * Math.cos(dtr(rot.z)),
z: p.z
};
}
},
pos: function (p, pos) {
return {
x: p.x + pos.x,
y: p.y + pos.y,
z: p.z + pos.z
};
}
},
pov: {plane: function (p) {
return {
x: p.x * cam.ang.cplane + p.z * cam.ang.splane,
y: p.y,
z: p.x * -cam.ang.splane + p.z * cam.ang.cplane
};
},
theta: function (p) {
return {
x: p.x,
y: p.y * cam.ang.ctheta - p.z * cam.ang.stheta,
z: p.y * cam.ang.stheta + p.z * cam.ang.ctheta
};
},
set: function (p) {
return {
x: p.x - cam.obj.x,
y: p.y - cam.obj.y,
z: p.z - cam.obj.z
};
}
},
persp: function (p) {
return {
x: p.x * cam.dist.z / p.z * cam.zoom,
y: p.y * cam.dist.z / p.z * cam.zoom,
z: p.z * cam.zoom,
p: cam.dist.z / p.z
};
},
disp: function (p, disp) {
return {
x: p.x + disp.x,
y: -p.y + disp.y,
z: p.z + disp.z,
p: p.p
};
},
steps: function (_obj_, sz, rot, pos, disp) {var _args = trans.parts.sz(_obj_, sz);
_args = trans.parts.rot.x(_args, rot);
_args = trans.parts.rot.y(_args, rot);
_args = trans.parts.rot.z(_args, rot);
_args = trans.parts.pos(_args, pos);
_args = trans.pov.plane(_args);
_args = trans.pov.theta(_args);
_args = trans.pov.set(_args);
_args = trans.persp(_args);
_args = trans.disp(_args, disp);
return _args;
}
};
(function () {
"use strict";
var threeD = function (param) {this.transIn = {};
this.transOut = {};
this.transIn.vtx = (param.vtx);
this.transIn.sz = (param.sz);
this.transIn.rot = (param.rot);
this.transIn.pos = (param.pos);
};
threeD.prototype.vupd = function () {
this.transOut = trans.steps(
this.transIn.vtx,
this.transIn.sz,
this.transIn.rot,
this.transIn.pos,
cam.disp
);
};
var Build = function () {
this.vel = 0.04;
this.lim = 360;
this.diff = 200;
this.initPos = 100;
this.toX = _x;
this.toY = _y;
this.go();};
Build.prototype.go = function () {this.canvas = document.getElementById("canv");
this.canvas.width = window.innerWidth;
this.canvas.height = window.innerHeight;
this.$ = canv.getContext("2d");
this.$.globalCompositeOperation = 'source-over';
this.varr = [];
this.dist = [];
this.calc = [];
for (var i = 0, len = num; i < len; i++) {this.add();
}
this.rotObj = {
x: 0,
y: 0,
z: 0
};
this.objSz = {
x: w / 5,
y: h / 5,
z: w / 5
};
};
Build.prototype.add = function () {
this.varr.push(new threeD({
vtx: {x: rnd(),
y: rnd(),
z: rnd()},
sz: {
x: 0,
y: 0,
z: 0
},
rot: {
x: 20,
y: -20,
z: 0
},
pos: {x: this.diff * Math.sin(360 * Math.random() * Math.PI / 180),
y: this.diff * Math.sin(360 * Math.random() * Math.PI / 180),
z: this.diff * Math.sin(360 * Math.random() * Math.PI / 180)
}
}));
this.calc.push({x: 360 * Math.random(),
y: 360 * Math.random(),
z: 360 * Math.random()});
};
Build.prototype.upd = function () {cam.obj.x += (this.toX - cam.obj.x) * 0.05;
cam.obj.y += (this.toY - cam.obj.y) * 0.05;
};
Build.prototype.draw = function () {this.$.clearRect(0, 0, this.canvas.width, this.canvas.height);
cam.upd();
this.rotObj.x += 0.1;
this.rotObj.y += 0.1;
this.rotObj.z += 0.1;
for (var i = 0; i < this.varr.length; i++) {for (var val in this.calc[i]) {if (this.calc[i].hasOwnProperty(val)) {this.calc[i][val] += this.vel;
if (this.calc[i][val] > this.lim) this.calc[i][val] = 0;
}
}
this.varr[i].transIn.pos = {x: this.diff * Math.cos(this.calc[i].x * Math.PI / 180),
y: this.diff * Math.sin(this.calc[i].y * Math.PI / 180),
z: this.diff * Math.sin(this.calc[i].z * Math.PI / 180)
};
this.varr[i].transIn.rot = this.rotObj;
this.varr[i].transIn.sz = this.objSz;
this.varr[i].vupd();
if (this.varr[i].transOut.p < 0) continue;
var g = this.$.createRadialGradient(this.varr[i].transOut.x, this.varr[i].transOut.y, this.varr[i].transOut.p, this.varr[i].transOut.x, this.varr[i].transOut.y, this.varr[i].transOut.p * 2);
this.$.globalCompositeOperation = 'lighter';
g.addColorStop(0, 'hsla(255, 255%, 255%, 1)');
g.addColorStop(.5, 'hsla(' + (i + 2) + ',85%, 40%,1)');
g.addColorStop(1, 'hsla(' + (i) + ',85%, 40%,.5)');
this.$.fillStyle = g;
this.$.beginPath();
this.$.arc(this.varr[i].transOut.x, this.varr[i].transOut.y, this.varr[i].transOut.p * 2, 0, Math.PI * 2, false);
this.$.fill();
this.$.closePath();}
};
Build.prototype.anim = function () {window.requestAnimationFrame = (function () {
return window.requestAnimationFrame ||
function (callback, element) {window.setTimeout(callback, 1000 / 60);
};
})();
var anim = function () {this.upd();
this.draw();
window.requestAnimationFrame(anim);
}.bind(this);
window.requestAnimationFrame(anim);
};
Build.prototype.run = function () {this.anim();
window.addEventListener('mousemove', function (e) {this.toX = (e.clientX - this.canvas.width / 2) * -0.8;
this.toY = (e.clientY - this.canvas.height / 2) * 0.8;
}.bind(this));
window.addEventListener('touchmove', function (e) {e.preventDefault();
this.toX = (e.touches[0].clientX - this.canvas.width / 2) * -0.8;
this.toY = (e.touches[0].clientY - this.canvas.height / 2) * 0.8;
}.bind(this));
window.addEventListener('mousedown', function (e) {for (var i = 0; i < 100; i++) {this.add();
}
}.bind(this));
window.addEventListener('touchstart', function (e) {e.preventDefault();
for (var i = 0; i < 100; i++) {this.add();
}
}.bind(this));
};
var app = new Build();
app.run();})();
window.addEventListener('resize', function () {
canvas.width = w = window.innerWidth;
canvas.height = h = window.innerHeight;
}, false);
</script>
</body>
</html>二：流星成果
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title> 一起来看流星雨 </title>
</head>
<style type="text/css">
body {background-color: black;}
body,
html {
width: 100%;
height: 100%;
overflow: hidden;
}
</style>
<body>
<canvas id="stars"></canvas>
</body>
</html>
<script>
var context;
var arr = new Array();
var starCount = 800;
var rains = new Array();
var rainCount = 20;
// 初始化画布及 context
function init() {
// 获取 canvas
var stars = document.getElementById("stars");
windowWidth = window.innerWidth; // 以后的窗口的高度
stars.width = windowWidth;
stars.height = window.innerHeight;
// 获取 context
context = stars.getContext("2d");
}
// 创立一个星星对象
var Star = function () {this.x = windowWidth * Math.random();// 横坐标
this.y = 5000 * Math.random();// 纵坐标
this.text = ".";// 文本
this.color = "white";// 色彩
// 产生随机色彩
this.getColor = function () {var _r = Math.random();
if (_r < 0.5) {this.color = "#333";} else {this.color = "white";}
}
// 初始化
this.init = function () {this.getColor();
}
// 绘制
this.draw = function () {
context.fillStyle = this.color;
context.fillText(this.text, this.x, this.y);
}
}
// 画月亮
function drawMoon() {var moon = new Image();
moon.src = "./images/moon.jpg"
context.drawImage(moon, -5, -10);
}
// 页面加载的时候
window.onload = function () {init();
// 画星星
for (var i = 0; i < starCount; i++) {var star = new Star();
star.init();
star.draw();
arr.push(star);
}
// 画流星
for (var i = 0; i < rainCount; i++) {var rain = new MeteorRain();
rain.init();
rain.draw();
rains.push(rain);
}
drawMoon();// 绘制月亮
playStars();// 绘制闪动的星星
playRains();// 绘制流星}
// 星星闪起来
function playStars() {for (var n = 0; n < starCount; n++) {arr[n].getColor();
arr[n].draw();}
setTimeout("playStars()", 100);
}
/* 流星雨开始 */
var MeteorRain = function () {
this.x = -1;
this.y = -1;
this.length = -1;// 长度
this.angle = 30; // 歪斜角度
this.width = -1;// 宽度
this.height = -1;// 高度
this.speed = 1;// 速度
this.offset_x = -1;// 横轴挪动偏移量
this.offset_y = -1;// 纵轴挪动偏移量
this.alpha = 1; // 透明度
this.color1 = "";// 流星的色调
this.color2 = ""; // 流星的色调
/**************** 初始化函数 ********************/
this.init = function () // 初始化
{this.getPos();
this.alpha = 1;// 透明度
this.getRandomColor();
// 最小长度，最大长度
var x = Math.random() * 80 + 150;
this.length = Math.ceil(x);
// x = Math.random()*10+30;
this.angle = 30; // 流星倾斜角
x = Math.random() + 0.5;
this.speed = Math.ceil(x); // 流星的速度
var cos = Math.cos(this.angle * 3.14 / 180);
var sin = Math.sin(this.angle * 3.14 / 180);
this.width = this.length * cos; // 流星所占宽度
this.height = this.length * sin;// 流星所占高度
this.offset_x = this.speed * cos;
this.offset_y = this.speed * sin;
}
/************** 获取随机色彩函数 *****************/
this.getRandomColor = function () {var a = Math.ceil(255 - 240 * Math.random());
// 中段色彩
this.color1 = "rgba(" + a + "," + a + "," + a + ",1)";
// 完结色彩
this.color2 = "black";
}
/*************** 从新计算流星坐标的函数 ******************/
this.countPos = function ()//
{
// 往左下挪动,x 缩小，y 减少
this.x = this.x - this.offset_x;
this.y = this.y + this.offset_y;
}
/***************** 获取随机坐标的函数 *****************/
this.getPos = function () //
{
// 横坐标 200--1200
this.x = Math.random() * window.innerWidth; // 窗口高度
// 纵坐标小于 600
this.y = Math.random() * window.innerHeight; // 窗口宽度}
/**** 绘制流星 ***************************/
this.draw = function () // 绘制一个流星的函数
{context.save();
context.beginPath();
context.lineWidth = 1; // 宽度
context.globalAlpha = this.alpha; // 设置透明度
// 创立横向突变色彩, 终点坐标至起点坐标
var line = context.createLinearGradient(this.x, this.y,
this.x + this.width,
this.y - this.height);
// 分段设置色彩
line.addColorStop(0, "white");
line.addColorStop(0.3, this.color1);
line.addColorStop(0.6, this.color2);
context.strokeStyle = line;
// 终点
context.moveTo(this.x, this.y);
// 起点
context.lineTo(this.x + this.width, this.y - this.height);
context.closePath();
context.stroke();
context.restore();}
this.move = function () {
// 清空流星像素
var x = this.x + this.width - this.offset_x;
var y = this.y - this.height;
context.clearRect(x - 3, y - 3, this.offset_x + 5, this.offset_y + 5);
// context.strokeStyle="red";
// context.strokeRect(x,y-1,this.offset_x+1,this.offset_y+1);
// 从新计算地位，往左下挪动
this.countPos();
// 透明度减少
this.alpha -= 0.002;
// 重绘
this.draw();}
}
// 绘制流星
function playRains() {for (var n = 0; n < rainCount; n++) {var rain = rains[n];
rain.move();// 挪动
if (rain.y > window.innerHeight) {// 超出界线后重来
context.clearRect(rain.x, rain.y - rain.height, rain.width, rain.height);
rains[n] = new MeteorRain();
rains[n].init();}
}
setTimeout("playRains()", 2);
}
/* 流星雨完结 */
</script>
正文完
