title: Highcharts heatmap without fixed non-temporal axis
body: <p>I wanna use the heatmap, but not with fixed categories.</p>
  
  <p>All the examples (e.g. <a href="http://jsfiddle.net/tZ6GP/19/" rel="nofollow noreferrer">http://jsfiddle.net/tZ6GP/19/</a>) I found had either only date axis or fixed categories, but I would like to have heatmap boxes on a chart with axis that have no predefined categories on the axis. </p>
  
  <pre><code>Highcharts.chart('customContainer', {
          title: {
              text: 'Wealth Development'
          },
          xAxis: {
              min: Date.UTC(2017,1,1),
              max: Date.UTC(2023,1,1),
              type: 'datetime',
              dateTimeLabelFormats: {
                  year: '%Y'
              }
          },
          yAxis: {
              min: 0,
              max: 8000,
              title: {
                  text: 'Wealth'
              },
              labels: {
                  formatter: function () {
                      return this.value / 1000 + 'K';
                  }
              }
          },
          series: [
              {
                  type: 'heatmap',
                  name: 'SAA heat',
                  rowsize: 3600000 * 24 * 365,
                  colsize: 1000,
                  data: [
                      { x: Date.UTC(2017,1,1), y: 4000 }
                  ]
              }
          ]
      });
  </code></pre>
  
  <p>The result should be a box with column size 1000 and row size 1 year. But it comes to a weird result with the exception: RangeError: Maximum call stack size exceeded</p>
  
  <p>Has anybody tried to generate such a heatmap? How yould I do that?</p>
  
  <p>I would finally try to have something like the following:</p>
  
  <p><a href="https://i.stack.imgur.com/x8uXQ.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/x8uXQ.png" alt="enter image description here"></a></p>
  
  <p>The colors in the diagram should consist of many boxes, so that certain values could be displayed when hovering over a box area. So the colored areas would be like a lot of boxes in a grid. With the arearange that would not be possible to my understanding, because the low and high points are focussed on hover, but not the area.</p>
  
  <p>Can anybody help me with this problem?</p>