js シミュレートされたバブル スクリーンセーバー効果コード_その他の特殊効果

var T$ = function(id) { return document.getElementById(id); }
var $extend = function(des, src) { for (var p in src) { des[p] = src[p]} return des; }
var Bubble = function() {
// 小球随机样式
var clss = ['ball_one', 'ball_two', 'ball_three', 'ball_four', 'ball_five', 'ball_six' ];
var Ball = function(radius, clsname) {
var ball = document.createElement('div');
ball.className = clsname;
with(ball.style) {
幅 = 高さ = (半径 || 10) 'px';  位置 = '絶対';
}
return ball;
};
// 屏保主类
var Screen = function(cid, config) {
var self = this;
if (! (self instanceof Screen)) {
return new Screen(cid, config);
}
self.container = T$(cid);
if (!self.container) return;
config = $extend(Screen.Config, config || {});
// 構成属性
self.ballsnum = config.ballsnum;
self.diameter = 55;
self .radius = self.diameter / 2;
self.bounce = config.bounce;
self.spring = config.spring;
self.gravity = config.gravity;
self.balls = [ ];
self.timer = null;
// 上下左右边界
self.T_bound = 0;
self.B_bound = self.container.clientHeight;
self.L_bound = 0;
self.R_bound = self.container.clientWidth;
};
// 静态プロパティ
Screen.Config = {
ballnum: 5, // 小球数目
spring: 0.8, // 弹力加速度
バウンス: -0.95, // 反弹
重力: 0.1 // 重力
};
Screen.prototype = {
initialize: function() {
var self = this;
// 小球生成
self.createBalls();
// 侦听碰撞
self.timer = set Interval(function() {
self.hitTest ();
}, 32);
},
createBalls: function() {
var self = this, num = self.ballsnum, i = 0;
var frag = document.createDocumentFragment();
for (; i var ball = new Ball(self.diameter, clss[Math.floor(Math.random() * (clss.length - 1))]);
ball.radius = self.radius ;
ball.diameter = self.diameter;
ball.style.left = (Math.random() * self.B_bound) 'px';
ball.style.top = (Math.random( ) * self.R_bound) 'px';
ball.vx = Math.random() * 6 - 3;
ball.vy = Math.random() * 6 - 3;
frag.appendChild (ball);
self.balls[i] = ball;
}
self.container.appendChild(frag);
},
// 碰撞检测
hitTest: function() {
var self = this, num = self.ballsnum,balls = self.balls;
for (var i = 0; i < num - 1; i ) {
var ball0 = ball[i];
ball0.x = ball0.offsetLeft ball0.radius;
ball0.y = ball0.offsetTop ball0.radius;
用(var j = i 1; j var ball1 = ball[j];
ball1.x = ball1.offsetLeft ball1.radius;
ball 1.y = ball1.offsetTop ball1.radius;
var dx = ball1.x - ball0.x;
var dy = ball1.y - ball0.y;
var dist = Math.sqrt( dx * dx dy * dy);
var missDist = ball0.radius ball1.radius;
if (dist < missDist) {
var angle = Math.atan2(dy, );
var tx = ball0.x 数学。 cos(angle) * missDist;
var ty = ball0.y Math.sin(angle) * missDist;
var ax = (tx - ball1.x) * self.spring;
var ay = ( ty - ball1.y) * self.spring;
ball0.vx -= ax;
ball0.vy -= ay;
ball1.v x = ax;
ball1.vy = ay;
}
}
}
for (var i = 0;私は＜数字; i ) {
self.move(balls[i]);
}
},
// 气泡运動
move: function(ball) {
var self = this;
ball.vy = self.gravity;
ball.style.left = (ball.off左に設定ball.vx) 'px';
ball.style.top = (ball.offsetTop ball.vy) 'px';
// 边界检测
var T = self.T_bound、B = self。 B_bound、L = self.L_bound、R = self.R_bound、BC = self.bounce;
if (ball.offsetLeft ball.diameter > R) {
ball.style.left = R - ball.diameter 'px';
ball.vx *= BC;
} else if (ball.offsetLeft < L) {
ball.style.left = L 'px';
ボール.vx * = BC;
}
if (ball.offsetTop ball.diameter > B) {
ball.style.top = B - ball.diameter 'px';
ball.vy *=紀元前;
} else if (ball.offsetTop < T) {
ball.style.top = T 'px';
ball.vy *= BC;
}
}
};
return { Screen: Screen }
}();
window.onload = function() {
var sc = null;
T$('start').onclick = function() {
document.getElementById('inner').innerHTML = '';
sc = Bubble.Screen('inner', { ボール数: 5、スプリング: 0.8、バウンス: -0.95、重力: 0.1});
sc.initialize();
};
T$('stop').onclick = function() { clearInterval(sc.timer); }
varbound = false
T$('change').onclick = function() {
if (!bound) {
T$('screen').style.backgroundImage = ' url("http://demo.jb51.net/js/bubbling/o_bg1.jpg")';
bound = true;
} else {
T$('screen').style. BackgroundImage = 'url("http://demo.jb51.net/js/bubbling/o_bg2.jpg")';
bound = false;
}
}
}