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学生学习页面_files/jqcloud-1.0.4.js.下载
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243
学生学习页面_files/jqcloud-1.0.4.js.下载
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(function($) {
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"use strict";
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$.fn.jQCloud = function(word_array, options) {
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// 容器元素的引用
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var $this = this;
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// 都已ID命名 避免多个标签之间的碰撞
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var cloud_namespace = $this.attr('id') || Math.floor((Math.random() * 1000000)).toString(36);
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// 默认选项值
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var default_options = {
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width: $this.width(),
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height: $this.height(),
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center: {
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x: ((options && options.width) ? options.width : $this.width()) / 2.0,
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y: ((options && options.height) ? options.height : $this.height()) / 2.0
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},
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delayedMode: word_array.length > 50,
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shape: false, // 默认为椭圆形状
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encodeURI: true,
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removeOverflowing: true
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};
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options = $.extend(default_options, options || {});
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// “jqcloud”类添加到容器简单的CSS样式,设置容器宽度/高度
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//$this.addClass("jqcloud").width(options.width).height(options.height);
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// 容器的CSS位置不能为“静态”
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if ($this.css("position") === "static") {
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$this.css("position", "relative");
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}
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var drawWordCloud = function() {
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//Helper函数来测试如果一个元素重叠
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var hitTest = function(elem, other_elems) {
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// 两两重叠检测
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var overlapping = function(a, b) {
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if (Math.abs(2.0 * a.offsetLeft + a.offsetWidth - 2.0 * b.offsetLeft - b.offsetWidth) < a.offsetWidth + b.offsetWidth) {
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if (Math.abs(2.0 * a.offsetTop + a.offsetHeight - 2.0 * b.offsetTop - b.offsetHeight) < a.offsetHeight + b.offsetHeight) {
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return true;
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}
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}
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return false;
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};
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var i = 0;
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// 检查元素重叠一个接一个,停止并返回false一旦发现重叠
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for (i = 0; i < other_elems.length; i++) {
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if (overlapping(elem, other_elems[i])) {
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return true;
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}
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}
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return false;
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};
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// 确保每一个重量之前是一个数字排序
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for (var i = 0; i < word_array.length; i++) {
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word_array[i].weight = parseFloat(word_array[i].weight, 10);
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}
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// 排序word_array从最高的词体重最低的一个
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word_array.sort(function(a, b) {
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if (a.weight < b.weight) {
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return 1;
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} else if (a.weight > b.weight) {
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return -1;
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} else {
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return 0;
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}
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});
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var step = (options.shape === "rectangular") ? 18.0 : 2.0,
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already_placed_words = [],
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aspect_ratio = options.width / options.height;
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// 函数画一词,在螺旋通过移动它,直到找到一个合适的空地方。这将是迭代每个单词。
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var drawOneWord = function(index, word) {
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// 定义跨越的ID属性,将这个词,和相关的jQuery选择器字符串
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var word_id = cloud_namespace + "_word_" + index,
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word_selector = "#" + word_id,
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angle = 6.28 * Math.random(),
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radius = 0.0,
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// Only used if option.shape == 'rectangular'
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steps_in_direction = 0.0,
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quarter_turns = 0.0,
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weight = 5,
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custom_class = "",
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inner_html = "",
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word_span;
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if (word_array.length > 6) {
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weight = 2;
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}
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// 扩展词html选项默认值
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word.html = $.extend(word.html, {
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id: word_id
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});
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// 如果指定的自定义类,把它们放在一个变量并将它从html attrs,避免由jQCloud覆盖类
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if (word.html && word.html["class"]) {
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custom_class = word.html["class"];
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delete word.html["class"];
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}
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// 检查是否min(重量)> max(重量)否则使用默认
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if (word_array[0].weight > word_array[word_array.length - 1].weight) {
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// 线性映射原体重一个离散的规模从1到10
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weight = Math.round((word.weight - word_array[word_array.length - 1].weight) /
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(word_array[0].weight - word_array[word_array.length - 1].weight) * 9) + 1;
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}
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word_span = $('<span>').attr(word.html).addClass('w' + weight + " " + custom_class);
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// 如果单词添加链接。url属性设置
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if (word.link) {
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//如果链接是一个字符串,然后使用它作为href链接
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if (typeof word.link === "string") {
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word.link = {
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href: word.link
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};
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}
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// 扩展链接的html选项默认值
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if (options.encodeURI) {
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word.link = $.extend(word.link, {
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href: encodeURI(word.link.href).replace(/'/g, "%27")
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});
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}
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inner_html = $('<a>').attr(word.link).text(word.text);
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} else {
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inner_html = word.text;
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}
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word_span.append(inner_html);
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// 将处理程序绑定到单词
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if (!!word.handlers) {
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for (var prop in word.handlers) {
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if (word.handlers.hasOwnProperty(prop) && typeof word.handlers[prop] === 'function') {
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$(word_span).bind(prop, word.handlers[prop]);
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}
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}
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}
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$this.append(word_span);
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var width = word_span.width(),
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height = word_span.height(),
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left = options.center.x - width / 2.0,
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top = options.center.y - height / 2.0;
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// 保存样式属性的引用,获得更好的性能
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var word_style = word_span[0].style;
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word_style.position = "absolute";
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word_style.left = left + "px";
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word_style.top = top + "px";
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while (hitTest(word_span[0], already_placed_words)) {
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// 选择形状是矩形的移动这个词在一个矩形螺旋
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if (options.shape === "rectangular") {
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steps_in_direction++;
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if (steps_in_direction * step > (1 + Math.floor(quarter_turns / 2.0)) * step * ((quarter_turns % 4 % 2) === 0 ? 1 : aspect_ratio)) {
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steps_in_direction = 0.0;
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quarter_turns++;
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}
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switch (quarter_turns % 4) {
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case 1:
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left += step * aspect_ratio + Math.random() * 2.0;
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break;
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case 2:
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top -= step + Math.random() * 2.0;
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break;
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case 3:
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left -= step * aspect_ratio + Math.random() * 2.0;
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break;
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case 0:
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top += step + Math.random() * 2.0;
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break;
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}
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} else { // 默认设置:椭圆螺旋形状
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radius += step;
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angle += (index % 2 === 0 ? 1 : -1) * step;
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left = options.center.x - (width / 2.0) + (radius * Math.cos(angle)) * aspect_ratio;
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top = options.center.y + radius * Math.sin(angle) - (height / 2.0);
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}
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word_style.left = left + "px";
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word_style.top = top + "px";
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}
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// 不呈现词如果外面将容器的一部分
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if (options.removeOverflowing && (left < 0 || top < 0 || (left + width) > options.width || (top + height) > options.height)) {
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word_span.remove()
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return;
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}
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already_placed_words.push(word_span[0]);
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// 如果现有调用回调
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if ($.isFunction(word.afterWordRender)) {
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word.afterWordRender.call(word_span);
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}
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};
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var drawOneWordDelayed = function(index) {
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index = index || 0;
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if (!$this.is(':visible')) { // 如果不可见，那么不要试图拉
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setTimeout(function() {
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drawOneWordDelayed(index);
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}, 10);
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return;
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}
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if (index < word_array.length) {
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drawOneWord(index, word_array[index]);
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setTimeout(function() {
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drawOneWordDelayed(index + 1);
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}, 10);
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} else {
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if ($.isFunction(options.afterCloudRender)) {
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options.afterCloudRender.call($this);
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}
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}
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};
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// 迭代drawOneWord上每一个字。迭代的方式完成取决于绘图模式(delayedMode是真或假的)
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if (options.delayedMode) {
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drawOneWordDelayed();
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} else {
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$.each(word_array, drawOneWord);
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if ($.isFunction(options.afterCloudRender)) {
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options.afterCloudRender.call($this);
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}
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}
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};
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// 延迟执行,以便在浏览器可以渲染云画推算的强化词前的页面
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setTimeout(function() {
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drawWordCloud();
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}, 10);
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return $this;
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};
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})(jQuery);
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