/**
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* echarts图表类：维恩图
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*
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* @desc echarts基于Canvas，纯Javascript图表库，提供直观，生动，可交互，可个性化定制的数据统计图表。
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* @author Loutongbing (娄同兵, loutongbing@126.com)
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*/
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define(function (require) {
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var ChartBase = require('./base');
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// 图形依赖
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var TextShape = require('zrender/shape/Text');
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var CircleShape = require('zrender/shape/Circle');
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var PathShape = require('zrender/shape/Path');
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var ecConfig = require('../config');
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// 维恩图默认参数
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ecConfig.venn = {
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zlevel: 0, // 一级层叠
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z: 1, // 二级层叠
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calculable: false
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};
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var ecData = require('../util/ecData');
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var zrUtil = require('zrender/tool/util');
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/**
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* 构造函数
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* @param {Object} messageCenter echart消息中心
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* @param {ZRender} zr zrender实例
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* @param {Object} series 数据
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* @param {Object} component 组件
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* @constructor
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* @exports Venn
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*/
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function Venn(ecTheme, messageCenter, zr, option, myChart) {
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// 图表基类
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ChartBase.call(this, ecTheme, messageCenter, zr, option, myChart);
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this.refresh(option);
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}
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Venn.prototype = {
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type : ecConfig.CHART_TYPE_VENN,
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/**
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* 绘制图形
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*/
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_buildShape : function () {
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this.selectedMap = {};
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this._symbol = this.option.symbolList;
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this._queryTarget;
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this._dropBoxList = [];
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this._vennDataCounter = 0;
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var series = this.series;
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var legend = this.component.legend;
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for (var i = 0; i < series.length; i++) {
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if (series[i].type === ecConfig.CHART_TYPE_VENN) {
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series[i] = this.reformOption(series[i]);
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var serieName = series[i].name || '';
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// 系列图例开关
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this.selectedMap[serieName] =
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legend ? legend.isSelected(serieName) : true;
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if (!this.selectedMap[serieName]) {
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continue;
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}
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this._buildVenn(i);
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}
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}
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this.addShapeList();
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},
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/**
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* 构建单个
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*
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* @param {Object} data 数据
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*/
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_buildVenn : function (seriesIndex) {
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var r0;
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var r1;
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var serie = this.series[seriesIndex];
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var data = serie.data;
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if (data[0].value > data[1].value) {
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r0 = this.zr.getHeight() / 3;
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r1 = r0 * Math.sqrt(data[1].value) / Math.sqrt(data[0].value);
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}
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else {
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r1 = this.zr.getHeight() / 3;
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r0 = r1 * Math.sqrt(data[0].value) / Math.sqrt(data[1].value);
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}
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var x0 = this.zr.getWidth() / 2 - r0;
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// 估值 两个圆心的距离与两圆半径均值之比等于交集与两集合均值的开方之比。
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// 公共距离（coincideLengthAnchor）/ 公共数值开方 = 半径平均值 / 各自数值均值的开方
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var coincideLengthAnchor = ((r0 + r1) / 2) * Math.sqrt(data[2].value) / Math.sqrt((data[0].value + data[1].value) / 2);
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// 如果两者没有公共面积，则圆心距就为两圆半径之和
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var coincideLength = r0 + r1;
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if (data[2].value !== 0) {
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coincideLength = this._getCoincideLength(
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data[0].value,
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data[1].value,
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data[2].value,
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r0, r1,
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coincideLengthAnchor,
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Math.abs(r0 - r1),
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r0 + r1
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);
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}
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var x1 = x0 + coincideLength;
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var y = this.zr.getHeight() / 2;
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this._buildItem(
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seriesIndex, 0, data[0],
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x0,
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y,
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r0
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);
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this._buildItem(
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seriesIndex, 1, data[1],
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x1,
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y,
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r1
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);
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// 包含关系与无交集关系均不画公共部分
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if (
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data[2].value !== 0
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&& data[2].value !== data[0].value
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&& data[2].value !== data[1].value
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) {
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var xLeft = (r0 * r0 - r1 * r1) / (2 * coincideLength) + coincideLength / 2;
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var xRight = coincideLength / 2 - (r0 * r0 - r1 * r1) / (2 * coincideLength);
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var h = Math.sqrt(r0 * r0 - xLeft * xLeft);
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// 判断大小圆弧
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var rightLargeArcFlag = 0;
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var leftLargeArcFlag = 0;
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if (
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data[0].value > data[1].value
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&& x1 < x0 + xLeft
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) {
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leftLargeArcFlag = 1;
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}
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if (
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data[0].value < data[1].value
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&& x1 < x0 + xRight
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) {
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rightLargeArcFlag = 1;
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}
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this._buildCoincideItem(
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seriesIndex,
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2,
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data[2],
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x0 + xLeft,
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y - h,
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y + h,
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r0,
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r1,
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rightLargeArcFlag,
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leftLargeArcFlag
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);
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}
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},
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/**
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* 逼近算法得到两圆的间距
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* @param {number} value0 第一个圆的原始数值
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* @param {number} value1 第二个圆的原始数值
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* @param {number} value3 公共部分的原始数值
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* @param {number} r0 第一个圆的半径
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* @param {number} r1 第二个圆的半径
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* @param {number} coincideLengthAnchor 锚定
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* @param {number} coincideLengthAnchorMin 下限
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* @param {number} coincideLengthAnchorMax 上限
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* @return {Node}
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*/
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_getCoincideLength: function (
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value0,
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value1,
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value2,
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r0,
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r1,
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coincideLengthAnchor,
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coincideLengthAnchorMin,
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coincideLengthAnchorMax
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) {
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// 计算
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var x = (r0 * r0 - r1 * r1) / (2 * coincideLengthAnchor) + coincideLengthAnchor / 2;
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var y = coincideLengthAnchor / 2 - (r0 * r0 - r1 * r1) / (2 * coincideLengthAnchor);
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// 夹角
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var alfa = Math.acos(x / r0);
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var beta = Math.acos(y / r1);
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// 第一个圆的面积
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var area0 = r0 * r0 * Math.PI;
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// 计算的公共面积 (思路是扇形减三角形)
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var area2 = alfa * r0 * r0 - x * r0 * Math.sin(alfa) + beta * r1 * r1 - y * r1 * Math.sin(beta);
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var scaleAnchor = area2 / area0;
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var scale = value2 / value0;
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var approximateValue = Math.abs(scaleAnchor / scale);
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if (approximateValue > 0.999 && approximateValue < 1.001) {
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return coincideLengthAnchor;
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}
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// 若是公共面积比较小，使距离减小一些，让公共面积增大
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else if (approximateValue <= 0.999) {
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coincideLengthAnchorMax = coincideLengthAnchor;
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// 二分法计算新的步调
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coincideLengthAnchor = (coincideLengthAnchor + coincideLengthAnchorMin) / 2;
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return this._getCoincideLength(value0, value1, value2, r0, r1,
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coincideLengthAnchor, coincideLengthAnchorMin, coincideLengthAnchorMax);
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}
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// 若是公共面积比较大，使距离增大一些，让公共面积减小
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else {
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coincideLengthAnchorMin = coincideLengthAnchor;
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coincideLengthAnchor = (coincideLengthAnchor + coincideLengthAnchorMax) / 2;
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return this._getCoincideLength(value0, value1, value2, r0, r1,
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coincideLengthAnchor, coincideLengthAnchorMin, coincideLengthAnchorMax);
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}
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},
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/**
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* 构建单个圆及指标
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*/
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_buildItem : function (
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seriesIndex, dataIndex, dataItem,
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x, y, r
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) {
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var series = this.series;
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var serie = series[seriesIndex];
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var circle = this.getCircle(
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seriesIndex,
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dataIndex,
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dataItem,
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x, y, r
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);
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ecData.pack(
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circle,
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serie, seriesIndex,
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dataItem, dataIndex,
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dataItem.name
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);
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this.shapeList.push(circle);
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if (serie.itemStyle.normal.label.show) {
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// 文本标签
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var label = this.getLabel(
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seriesIndex,
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dataIndex,
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dataItem,
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x, y, r
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);
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ecData.pack(
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label,
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serie, seriesIndex,
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serie.data[dataIndex], dataIndex,
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serie.data[dataIndex].name
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);
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this.shapeList.push(label);
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}
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},
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_buildCoincideItem : function (
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seriesIndex, dataIndex, dataItem,
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x, y0, y1, r0, r1, rightLargeArcFlag, leftLargeArcFlag
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) {
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var series = this.series;
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var serie = series[seriesIndex];
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var queryTarget = [dataItem, serie];
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// 多级控制
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var normal = this.deepMerge(
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queryTarget,
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'itemStyle.normal'
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) || {};
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var emphasis = this.deepMerge(
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queryTarget,
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'itemStyle.emphasis'
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) || {};
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var normalColor = normal.color || this.zr.getColor(dataIndex);
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var emphasisColor = emphasis.color || this.zr.getColor(dataIndex);
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var path = 'M' + x + ',' + y0
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+ 'A' + r0 + ',' + r0 + ',0,' + rightLargeArcFlag + ',1,' + x + ',' + y1
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+ 'A' + r1 + ',' + r1 + ',0,' + leftLargeArcFlag + ',1,' + x + ',' + y0;
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var style = {
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color: normalColor,
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// path: rx ry x-axis-rotation large-arc-flag sweep-flag x y
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path: path
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};
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var shape = {
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zlevel: serie.zlevel,
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z: serie.z,
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style: style,
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highlightStyle: {
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color: emphasisColor,
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lineWidth: emphasis.borderWidth,
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strokeColor: emphasis.borderColor
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}
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};
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shape = new PathShape(shape);
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if (shape.buildPathArray) {
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shape.style.pathArray = shape.buildPathArray(style.path);
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}
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ecData.pack(
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shape,
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series[seriesIndex], 0,
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dataItem, dataIndex,
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dataItem.name
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);
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this.shapeList.push(shape);
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},
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/**
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* 构建圆形
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*/
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getCircle : function (
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seriesIndex,
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dataIndex,
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dataItem,
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x, y, r
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) {
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var serie = this.series[seriesIndex];
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var queryTarget = [dataItem, serie];
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// 多级控制
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var normal = this.deepMerge(
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queryTarget,
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'itemStyle.normal'
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) || {};
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var emphasis = this.deepMerge(
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queryTarget,
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'itemStyle.emphasis'
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) || {};
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var normalColor = normal.color || this.zr.getColor(dataIndex);
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var emphasisColor = emphasis.color || this.zr.getColor(dataIndex);
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var circle = {
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zlevel: serie.zlevel,
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z: serie.z,
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clickable: true,
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style: {
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x: x,
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y: y,
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r: r,
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brushType: 'fill',
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opacity: 1,
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color: normalColor
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},
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highlightStyle: {
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color: emphasisColor,
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lineWidth: emphasis.borderWidth,
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strokeColor: emphasis.borderColor
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}
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};
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if (this.deepQuery([dataItem, serie, this.option], 'calculable')) {
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this.setCalculable(circle);
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circle.draggable = true;
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}
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return new CircleShape(circle);
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},
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/**
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* 需要显示则会有返回构建好的shape，否则返回undefined
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*/
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getLabel: function (
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seriesIndex,
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dataIndex,
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dataItem,
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x, y, r
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) {
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var serie = this.series[seriesIndex];
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var itemStyle = serie.itemStyle;
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var queryTarget = [dataItem, serie];
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// 多级控制
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var normal = this.deepMerge(
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queryTarget,
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'itemStyle.normal'
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) || {};
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var status = 'normal';
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// label配置
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var labelControl = itemStyle[status].label;
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var textStyle = labelControl.textStyle || {};
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var text = this.getLabelText(dataIndex, dataItem, status);
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var textFont = this.getFont(textStyle);
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var textColor = normal.color || this.zr.getColor(dataIndex);
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// 求出label的纵坐标
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var textSize = textStyle.fontSize || 12;
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var textShape = {
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zlevel: serie.zlevel,
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z: serie.z,
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style: {
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x: x,
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y: y - r - textSize,
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color: textStyle.color || textColor,
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text: text,
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textFont: textFont,
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textAlign: 'center'
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}
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};
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return new TextShape(textShape);
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},
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/**
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* 根据lable.format计算label text
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*/
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getLabelText : function (dataIndex, dataItem, status) {
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var series = this.series;
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var serie = series[0];
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var formatter = this.deepQuery(
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[dataItem, serie],
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'itemStyle.' + status + '.label.formatter'
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);
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if (formatter) {
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if (typeof formatter == 'function') {
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return formatter(
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serie.name,
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dataItem.name,
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dataItem.value
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);
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}
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else if (typeof formatter == 'string') {
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formatter = formatter.replace('{a}','{a0}')
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.replace('{b}','{b0}')
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.replace('{c}','{c0}');
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formatter = formatter.replace('{a0}', serie.name)
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.replace('{b0}', dataItem.name)
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.replace('{c0}', dataItem.value);
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return formatter;
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}
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}
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else {
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return dataItem.name;
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}
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},
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/**
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* 刷新
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*/
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refresh : function (newOption) {
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if (newOption) {
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this.option = newOption;
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this.series = newOption.series;
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}
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this._buildShape();
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}
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};
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zrUtil.inherits(Venn, ChartBase);
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// 图表注册
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require('../chart').define('venn', Venn);
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return Venn;
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});
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