[demo] when axis label rotate(such as 90 degree), the sample algorithm does not work correctly

[kkxxkk2019]

It should display all the label on the bottom axis.

preproduce spec:

const items = [
  '资产负债率',
  '剔除预收款项后的资产负债率',
  '长期资本负债率',
  '长期资产适合率',
  '权益乘数',
  '流动负债权益比率',
  '带息债务/全部投入资本',
  '流动负债/负债合计',
  '资本固定化比率',
  '期望违约频率EDF'
];
const rawData = [
  1.0, 0.594527, 0.492963, -0.160995, 0.723664, 0.658646, -0.857474, 0.320706, -0.284634, -0.091423, 0.594527, 1.0,
  0.724546, -0.099318, 0.540639, 0.49214, -0.554039, 0.17127, -0.265259, 0.068577, 0.492963, 0.724546, 1.0, -0.091338,
  0.450542, 0.375839, -0.524955, 0.300627, -0.198362, 0.033209, -0.160995, -0.099318, -0.091338, 1.0, -0.049872,
  -0.028452, 0.157157, 0.009742, -0.162374, 0.155095, 0.723664, 0.540639, 0.450542, -0.049872, 1.0, 0.951933, -0.651767,
  0.079052, -0.535984, 0.00798, 0.658646, 0.49214, 0.375839, -0.028452, 0.951933, 1.0, -0.543147, -0.106139, -0.52232,
  0.011466, -0.857474, -0.554039, -0.524955, 0.157157, -0.651767, -0.543147, 1.0, -0.595016, 0.310521, 0.066397,
  0.320706, 0.17127, 0.300627, 0.009742, 0.079052, -0.106139, -0.595016, 1.0, -0.105199, -0.064886, -0.284634,
  -0.265259, -0.198362, -0.162374, -0.535984, -0.52232, 0.310521, -0.105199, 1.0, -0.080153, -0.091423, 0.068577,
  0.033209, 0.155095, 0.00798, 0.011466, 0.066397, -0.064886, -0.080153, 1.0
];
const data = [];
for (let i = 0; i < items.length; i++) {
  for (let j = 0; j < items.length; j++) {
    data.push({
      var1: items[i],
      var2: items[j],
      value: rawData[i * items.length + j]
    });
  }
}

const spec = {
  type: 'common',
  padding: 12,
  data: [
    {
      id: 'data0',
      values: data
    }
  ],
  series: [
    {
      type: 'heatmap',
      regionId: 'region0',
      xField: 'var1',
      yField: 'var2',
      valueField: 'value',
      cell: {
        style: {
          fill: {
            field: 'value',
            scale: 'color'
          }
        }
      }
    }
  ],
  region: [
    {
      id: 'region0',
      width: 300, // 限定 region 的宽度
      height: 300 // 限定 region 的高度
    }
  ],
  color: {
    type: 'linear',
    domain: [
      {
        dataId: 'data0',
        fields: ['value']
      }
    ],
    range: ['#feedde', '#fdbe85', '#fd8d3c', '#e6550d', '#a63603']
  },
  axes: [
    {
      orient: 'bottom',
      type: 'band',
      grid: {
        visible: false
      },
      domainLine: {
        visible: false
      },
      label: {
        space: 10,
        style: {
          textAlign: 'left',
          textBaseline: 'middle',
          angle: 90
        }
      },
      bandPadding: 0,
      height: layoutRect => {
        // 将底部轴的高度设置为画布的高度 - region 高度 - paddingTop - paddingBottom
        return layoutRect.height - 324;
      }
    },
    {
      orient: 'left',
      type: 'band',
      grid: {
        visible: false
      },
      domainLine: {
        visible: false
      },
      label: {
        space: 10
      },
      bandPadding: 0
    }
  ],
  legends: {
    visible: true,
    orient: 'right',
    type: 'color',
    field: 'value',
    title: {
      visible: true,
      text: `Correlation Coefficient`
    }
  }
};