/* * 3d标签云 * 功能:鼠标移入标签,当前标签静止放大 * 说明: * */ window.tagcloud = (function(win, doc) { // ns // 判断对象 function isObject (obj) { return Object.prototype.toString.call(obj) === '[object Object]'; } // 构造函数 function TagCloud (options) { var self = this; self.config = TagCloud._getConfig(options); self.box = self.config.element; //组件元素 self.fontsize = self.config.fontsize; //平均字体大小 self.radius = self.config.radius; //滚动半径 self.depth = 2 * self.radius; //滚动深度 self.size = 2 * self.radius; //随鼠标滚动变速作用区域 self.mspeed = TagCloud._getMsSpeed(self.config.mspeed); self.ispeed = TagCloud._getIsSpeed(self.config.ispeed); self.items = self._getItems(); self.direction = self.config.direction; //初始滚动方向 self.keep = self.config.keep; //鼠标移出后是否保持之前滚动 //初始化 self.active = false; //是否为激活状态 self.lasta = 1; self.lastb = 1; self.mouseX0 = self.ispeed * Math.sin(self.direction * Math.PI / 180); //鼠标与滚动圆心x轴初始距离 self.mouseY0 = -self.ispeed * Math.cos(self.direction * Math.PI / 180); //鼠标与滚动圆心y轴初始距离 self.mouseX = self.mouseX0; //鼠标与滚动圆心x轴距离 self.mouseY = self.mouseY0; //鼠标与滚动圆心y轴距离 self.index = -1; //鼠标移入 TagCloud._on(self.box, 'mouseover', function () { self.active = true; }); //鼠标移出 TagCloud._on(self.box, 'mouseout', function () { self.active = false; }); //鼠标在内移动 TagCloud._on(self.keep ? win : self.box, 'mousemove', function (ev) { var oEvent = win.event || ev; var boxPosition = self.box.getBoundingClientRect(); self.mouseX = (oEvent.clientX - (boxPosition.left + self.box.offsetWidth / 2)) / 5; self.mouseY = (oEvent.clientY - (boxPosition.top + self.box.offsetHeight / 2)) / 5; }); for (var j = 0, len = self.items.length; j < len; j++) { self.items[j].element.index=j; //鼠标移出子元素,当前元素静止放大 self.items[j].element.onmouseover = function(){ self.index = this.index; }; //鼠标移出子元素,当前元素继续滚动 self.items[j].element.onmouseout = function(){ self.index = -1; }; } //定时更新 TagCloud.boxs.push(self.box); self.update(self); //初始更新 self.box.style.visibility = "visible"; self.box.style.position = "relative"; // self.box.style.minHeight = 1.2 * self.size + "px"; // self.box.style.minWidth = 2.5 * self.size + "px"; for (var j = 0, len = self.items.length; j < len; j++) { self.items[j].element.style.position = "absolute"; self.items[j].element.style.zIndex = j + 1; } self.up = setInterval(function() { self.update(self); }, 10); } //实例 TagCloud.boxs = []; //实例元素数组 // 静态方法们 TagCloud._set = function (element) { if (TagCloud.boxs.indexOf(element) == -1) {//ie8不支持数组的indexOf方法 return true; } }; //添加数组IndexOf方法 if (!Array.prototype.indexOf){ Array.prototype.indexOf = function(elt /*, from*/){ var len = this.length >>> 0; var from = Number(arguments[1]) || 0; from = (from < 0) ? Math.ceil(from) : Math.floor(from); if (from < 0) from += len; for (; from < len; from++){ if (from in this && this[from] === elt) return from; } return -1; }; } TagCloud._getConfig = function (config) { var defaultConfig = { //默认值 fontsize: 16, //基本字体大小, 单位px radius: 60, //滚动半径, 单位px mspeed: "normal", //滚动最大速度, 取值: slow, normal(默认), fast ispeed: "normal", //滚动初速度, 取值: slow, normal(默认), fast direction: 135, //初始滚动方向, 取值角度(顺时针360): 0对应top, 90对应left, 135对应right-bottom(默认)... keep: true //鼠标移出组件后是否继续随鼠标滚动, 取值: false, true(默认) 对应 减速至初速度滚动, 随鼠标滚动 }; if(isObject(config)) { for(var i in config) { if(config.hasOwnProperty(i)) {//hasOwnProperty()用来判断一个属性是定义在对象本身而不是继承自原型链 defaultConfig[i] = config[i]; //用户配置 } } } return defaultConfig;// 配置 Merge }; TagCloud._getMsSpeed = function (mspeed) { //滚动最大速度 var speedMap = { slow: 1.5, normal: 3, fast: 5 }; return speedMap[mspeed] || 3; }; TagCloud._getIsSpeed = function (ispeed) { //滚动初速度 var speedMap = { slow: 10, normal: 25, fast: 50 }; return speedMap[ispeed] || 25; }; TagCloud._getSc = function(a, b) { var l = Math.PI / 180; //数组顺序0,1,2,3表示asin,acos,bsin,bcos return [ Math.sin(a * l), Math.cos(a * l), Math.sin(b * l), Math.cos(b * l) ]; }; TagCloud._on = function (ele, eve, handler, cap) { if (ele.addEventListener) { ele.addEventListener(eve, handler, cap); } else if (ele.attachEvent) { ele.attachEvent('on' + eve, handler); } else { ele['on' + eve] = handler; } }; // 原型方法 TagCloud.prototype = { constructor: TagCloud, // 反向引用构造器 update: function () { var self = this, a, b; if (!self.active && !self.keep) { self.mouseX = Math.abs(self.mouseX - self.mouseX0) < 1 ? self.mouseX0 : (self.mouseX + self.mouseX0) / 2; //重置鼠标与滚动圆心x轴距离 self.mouseY = Math.abs(self.mouseY - self.mouseY0) < 1 ? self.mouseY0 : (self.mouseY + self.mouseY0) / 2; //重置鼠标与滚动圆心y轴距离 } a = -(Math.min(Math.max(-self.mouseY, -self.size), self.size) / self.radius ) * self.mspeed; b = (Math.min(Math.max(-self.mouseX, -self.size), self.size) / self.radius ) * self.mspeed; if (Math.abs(a) <= 0.01 && Math.abs(b) <= 0.01) { return; } self.lasta = a; self.lastb = b; var sc = TagCloud._getSc(a, b); for (var j = 0, len = self.items.length; j < len; j++) { var rx1 = self.items[j].x, ry1 = self.items[j].y*sc[1] + self.items[j].z*(-sc[0]), rz1 = self.items[j].y*sc[0] + self.items[j].z*sc[1]; var rx2 = rx1 * sc[3] + rz1 * sc[2], ry2 = ry1, rz2 = rz1 * sc[3] - rx1 * sc[2]; if(self.index==j){ self.items[j].scale = 1; //取值范围0.6 ~ 3 self.items[j].fontsize = 16; self.items[j].alpha = 1; self.items[j].element.style.zIndex = 99; }else{ var per = self.depth / (self.depth + rz2); self.items[j].x = rx2; self.items[j].y = ry2; self.items[j].z = rz2; self.items[j].scale = per; //取值范围0.6 ~ 3 self.items[j].fontsize = Math.ceil(per * 2) + self.fontsize - 6; self.items[j].alpha = 1.5 * per - 0.5; self.items[j].element.style.zIndex = Math.ceil(per*10-5); } //self.items[j].element.style.fontSize = self.items[j].fontsize + "px";//字体变大小 self.items[j].element.style.left = self.items[j].x + (self.box.offsetWidth - self.items[j].offsetWidth) / 2 + "px"; self.items[j].element.style.top = self.items[j].y + (self.box.offsetHeight - self.items[j].offsetHeight) / 2 + "px"; self.items[j].element.style.filter = "alpha(opacity=" + 100 * self.items[j].alpha + ")"; self.items[j].element.style.opacity = self.items[j].alpha; } }, _getItems: function () { var self = this, items = [], element = self.box.children, // children 全部是Element length = element.length, item; for (var i = 0; i < length; i++) { item = {}; item.angle = {}; item.angle.phi = Math.acos(-1 + (2 * i + 1) / length); item.angle.theta = Math.sqrt((length + 1) * Math.PI) * item.angle.phi; item.element = element[i]; item.offsetWidth = item.element.offsetWidth; item.offsetHeight = item.element.offsetHeight; item.x = self.radius * 1.5 * Math.cos(item.angle.theta) * Math.sin(item.angle.phi); item.y = self.radius * 1.5 * Math.sin(item.angle.theta) * Math.sin(item.angle.phi); item.z = self.radius * 1.5 * Math.cos(item.angle.phi); item.element.style.left = item.x + (self.box.offsetWidth - item.offsetWidth) / 2 + "px"; item.element.style.top = item.y + (self.box.offsetHeight - item.offsetHeight) / 2 + "px"; items.push(item); } return items; //单元素数组 } }; if (!doc.querySelectorAll) {//ie7不支持querySelectorAll,所以要重新定义 doc.querySelectorAll = function (selectors) { var style = doc.createElement('style'), elements = [], element; doc.documentElement.firstChild.appendChild(style); doc._qsa = []; style.styleSheet.cssText = selectors + '{x-qsa:expression(document._qsa && document._qsa.push(this))}'; window.scrollBy(0, 0); style.parentNode.removeChild(style); while (doc._qsa.length) { element = doc._qsa.shift(); element.style.removeAttribute('x-qsa'); elements.push(element); } doc._qsa = null; return elements; }; } return function (options) { // factory options = options || {}; // 短路语法 var selector = options.selector || '.tagcloud', //默认选择class为tagcloud的元素 elements = doc.querySelectorAll(selector), instance = []; for (var index = 0, len = elements.length; index < len; index++) { options.element = elements[index]; if (!!TagCloud._set(options.element)) { instance.push(new TagCloud(options)); } } return instance; }; })(window, document);