/*
title: Polynomial Regression
category: scatter
titleCN: 多项式回归（使用统计插件）
difficulty: 2
*/

// See https://github.com/ecomfe/echarts-stat
echarts.registerTransform(ecStat.transform.regression);

var data = [
    [96.24, 11.35],
    [33.09, 85.11],
    [57.60, 36.61],
    [36.77, 27.26],
    [20.10, 6.72],
    [45.53, 36.37],
    [110.07, 80.13],
    [72.05, 20.88],
    [39.82, 37.15],
    [48.05, 70.50],
    [0.85, 2.57],
    [51.66, 63.70],
    [61.07, 127.13],
    [64.54, 33.59],
    [35.50, 25.01],
    [226.55, 664.02],
    [188.60, 175.31],
    [81.31, 108.68]
];

option = {
    dataset: [{
        source: data
    }, {
        transform: {
            type: 'ecStat:regression',
            config: { method: 'polynomial', order: 3 }
        }
    }],
    title: {
        text: '18 companies net profit and main business income (million)',
        subtext: 'By ecStat.regression',
        sublink: 'https://github.com/ecomfe/echarts-stat',
        left: 'center',
        top: 16
    },
    tooltip: {
        trigger: 'axis',
        axisPointer: {
            type: 'cross'
        }
    },
    xAxis: {
        splitLine: {
            lineStyle: {
                type: 'dashed'
            }
        },
        splitNumber: 20
    },
    yAxis: {
        min: -40,
        splitLine: {
            lineStyle: {
                type: 'dashed'
            }
        }
    },
    series: [{
        name: 'scatter',
        type: 'scatter'
        }, {
        name: 'line',
        type: 'line',
        smooth: true,
        datasetIndex: 1,
        symbolSize: 0.1,
        symbol: 'circle',
        label: { show: true, fontSize: 16 },
        labelLayout: { dx: -20 },
        encode: { label: 2, tooltip: 1 }
    }]
};