森林的增长echarts pictorialBar配置项内容和展示

      var treeDataURI = 'data:image/png;base64,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';

var beginYear = 2016;
var endYear = 2050;
var lineCount = 10;


// Basic option:
option = {
    color: ['#e54035'],
    xAxis: {
        axisLine: {show: false},
        axisLabel: {show: false},
        axisTick: {show: false},
        splitLine: {show: false},
        name: beginYear,
        nameLocation: 'middle',
        nameGap: 40,
        nameTextStyle: {
            color: 'green',
            fontSize: 30,
            fontFamily: 'Arial'
        },
        min: -2800,
        max: 2800
    },
    yAxis: {
        data: makeCategoryData(),
        show: false
    },
    grid: {
        top: 'center',
        height: 280
    },
    series: [{
        name: 'all',
        type: 'pictorialBar',
        symbol: 'image://' + treeDataURI,
        symbolSize: [30, 55],
        symbolRepeat: true,
        data: makeSeriesData(beginYear),
        animationEasing: 'elasticOut'
    }, {
        name: 'all',
        type: 'pictorialBar',
        symbol: 'image://' + treeDataURI,
        symbolSize: [30, 55],
        symbolRepeat: true,
        data: makeSeriesData(beginYear, true),
        animationEasing: 'elasticOut'
    }]
};


// Make fake data.
function makeCategoryData() {
    var categoryData = [];
    for (var i = 0; i < lineCount; i++) {
        categoryData.push(i + 'a');
    }
    return categoryData;
}

function makeSeriesData(year, negative) {
    // make a fake value just for demo.
    var r = (year - beginYear + 1) * 10;
    var seriesData = [];

    for (var i = 0; i < lineCount; i++) {
        var sign = (negative ? -1 * ((i % 3) ? 0.9 : 1): 1 * (((i + 1) % 3) ? 0.9 : 1));
        seriesData.push({
            value: 0,
            value: sign * (
                year <= beginYear + 1
                ? (Math.abs(i - lineCount / 2 + 0.5) < lineCount / 5 ? 5 : 0)
                : (lineCount - Math.abs(i - lineCount / 2 + 0.5)) * r
            ),
            symbolOffset: (i % 2) ? ['50%', 0] : null
        });
    }
    return seriesData;
}



// Set dynamic data.
var currentYear = beginYear;
setInterval(function () {
    currentYear++;
    if (currentYear > endYear) {
        currentYear = beginYear;
    }
    myChart.setOption({
        xAxis: {
            name: currentYear
        },
        series: [{
            data: makeSeriesData(currentYear)
        }, {
            data: makeSeriesData(currentYear, true)
        }]
    });
}, 800);