自定义图表echarts custom配置项内容和展示

      // var girth = [8.3, 8.6, 8.8, 10.5, 10.7, 10.8, 11.0, 11.0, 11.1, 11.2, 11.3, 11.4, 11.4, 11.7, 12.0, 12.9, 12.9, 13.3, 13.7, 13.8, 14.0, 14.2, 14.5, 16.0, 16.3, 17.3, 17.5, 17.9, 18.0, 18.0, 20.6];

// // See https://github.com/ecomfe/echarts-stat
// var bins = ecStat.histogram(girth);

// var data = echarts.util.map(bins.data, function (item, index) {
//     var x0 = bins.bins[index].x0;
//     var x1 = bins.bins[index].x1;
//     return [x0, x1, item[1]];
// });

var data = JSON.parse("[[8,10,3],[10,12,11],[12,14,6],[14,16,3],[16,18,5],[18,20,2],[20,22,1]]");

console.log('data', data);

function renderItem(params, api) {
    var yValue = api.value(2);
    var start = api.coord([api.value(0), yValue]);
    console.log('start', start);
    var size = api.size([api.value(1) - api.value(0), yValue]);
    console.log('size', size);
    var style = api.style();

    return {
        type: 'rect',
        shape: {
            x: start[0],
            y: start[1],
            width: size[0],
            height: size[1]
        },
        style: style
    };
}

option = {
    grid: {
        top: 80,
        containLabel: true
    },
    xAxis: [{
        type: 'value',
    }],
    yAxis: [{
        type: 'value',
    }],
    tooltip: {},
    series: [{
        type: 'custom',
        renderItem: renderItem,
        label: {
            show: true,
            position: 'insideTop'
        },
        encode: {
            x: [0, 1],
            y: 2,
        },
        data: data
    }]
};