/*
title: Exponential Regression
category: scatter
titleCN: 指数回归（使用统计插件）
difficulty: 1
*/

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

option = {
    dataset: [{
        source: [
            [1, 4862.4],
            [2, 5294.7],
            [3, 5934.5],
            [4, 7171.0],
            [5, 8964.4],
            [6, 10202.2],
            [7, 11962.5],
            [8, 14928.3],
            [9, 16909.2],
            [10, 18547.9],
            [11, 21617.8],
            [12, 26638.1],
            [13, 34634.4],
            [14, 46759.4],
            [15, 58478.1],
            [16, 67884.6],
            [17, 74462.6],
            [18, 79395.7]
        ]
    }, {
        transform: {
            type: 'ecStat:regression',
            config: {
                method: 'exponential',
                // 'end' by default
                // formulaOn: 'start'
            }
        }
    }],
    title: {
        text: '1981 - 1998 gross domestic product GDP (trillion yuan)',
        subtext: 'By ecStat.regression',
        sublink: 'https://github.com/ecomfe/echarts-stat',
        left: 'center'
    },
    tooltip: {
        trigger: 'axis',
        axisPointer: {
            type: 'cross'
        }
    },
    xAxis: {
        splitLine: {
            lineStyle: {
                type: 'dashed'
            }
        }
    },
    yAxis: {
        splitLine: {
            lineStyle: {
                type: 'dashed'
            }
        }
    },
    series: [{
        name: 'scatter',
        type: 'scatter',
        datasetIndex: 0
    },{
        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 }
    }]
};