136 lines
5.1 KiB
JavaScript
Executable File
136 lines
5.1 KiB
JavaScript
Executable File
/**
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* Created by zhouweipeng on 2016/12/26.
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*/
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/*! fly - v1.0.0 - 2014-12-22
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* https://github.com/amibug/fly
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* Copyright (c) 2014 wuyuedong; Licensed MIT */
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(function ($) {
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$.fly = function (element, options) {
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// 默认值
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var defaults = {
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version: '1.0.0',
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autoPlay: true,
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vertex_Rtop: 20, // 默认顶点高度top值
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speed: 1.2,
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start: {}, // top, left, width, height
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end: {},
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onEnd: $.noop
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};
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var self = this,
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$element = $(element);
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/**
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* 初始化组件，new的时候即调用
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*/
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self.init = function (options) {
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this.setOptions(options);
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!!this.settings.autoPlay && this.play();
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};
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/**
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* 设置组件参数
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*/
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self.setOptions = function (options) {
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this.settings = $.extend(true, {}, defaults, options);
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var settings = this.settings,
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start = settings.start,
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end = settings.end;
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$element.css({marginTop: '0px', marginLeft: '0px', position: 'fixed'}).appendTo('body');
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// 运动过程中有改变大小
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if (end.width != null && end.height != null) {
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$.extend(true, start, {
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width: $element.width(),
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height: $element.height()
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});
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}
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// 运动轨迹最高点top值
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var vertex_top = Math.min(start.top, end.top) - Math.abs(start.left - end.left) / 3;
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if (vertex_top < settings.vertex_Rtop) {
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// 可能出现起点或者终点就是运动曲线顶点的情况
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vertex_top = Math.min(settings.vertex_Rtop, Math.min(start.top, end.top));
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}
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/**
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* 运动轨迹在页面中的top值可以抽象成函数 y = a * x*x + b;
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* a = curvature
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* b = vertex_top
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*/
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var distance = Math.sqrt(Math.pow(start.top - end.top, 2) + Math.pow(start.left - end.left, 2)),
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// 元素移动次数
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steps = Math.ceil(Math.min(Math.max(Math.log(distance) / 0.05 - 75, 30), 100) / settings.speed),
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ratio = start.top == vertex_top ? 0 : -Math.sqrt((end.top - vertex_top) / (start.top - vertex_top)),
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vertex_left = (ratio * start.left - end.left) / (ratio - 1),
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// 特殊情况，出现顶点left==终点left，将曲率设置为0，做直线运动。
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curvature = end.left == vertex_left ? 0 : (end.top - vertex_top) / Math.pow(end.left - vertex_left, 2);
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$.extend(true, settings, {
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count: -1, // 每次重置为-1
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steps: steps,
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vertex_left: vertex_left,
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vertex_top: vertex_top,
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curvature: curvature
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});
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};
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/**
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* 开始运动，可自己调用
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*/
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self.play = function () {
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this.move();
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};
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/**
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* 按step运动
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*/
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self.move = function () {
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var settings = this.settings,
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start = settings.start,
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count = settings.count,
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steps = settings.steps,
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end = settings.end;
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// 计算left top值
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var left = start.left + (end.left - start.left) * count / steps,
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top = settings.curvature == 0 ? start.top + (end.top - start.top) * count / steps : settings.curvature * Math.pow(left - settings.vertex_left, 2) + settings.vertex_top;
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// 运动过程中有改变大小
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if (end.width != null && end.height != null) {
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var i = steps / 2,
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width = end.width - (end.width - start.width) * Math.cos(count < i ? 0 : (count - i) / (steps - i) * Math.PI / 2),
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height = end.height - (end.height - start.height) * Math.cos(count < i ? 0 : (count - i) / (steps - i) * Math.PI / 2);
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$element.css({width: width + "px", height: height + "px", "font-size": Math.min(width, height) + "px"});
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}
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$element.css({
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left: left + "px",
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top: top + "px"
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});
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settings.count++;
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// 定时任务
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var time = window.requestAnimationFrame($.proxy(this.move, this));
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if (count == steps) {
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window.cancelAnimationFrame(time);
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// fire callback
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settings.onEnd.apply(this);
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}
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};
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/**
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* 销毁
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*/
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self.destory = function(){
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$element.remove();
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};
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self.init(options);
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};
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// add the plugin to the jQuery.fn object
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$.fn.fly = function (options) {
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return this.each(function () {
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if (undefined == $(this).data('fly')) {
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$(this).data('fly', new $.fly(this, options));
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}
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});
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};
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})(jQuery); |