Customize a single heatmap cell's color in Angular ngx-ECharts

Currently, I am in search of a technique to modify only one specific cell within an echart heatmap. After exploring the api documentation, I discovered that it is possible to adjust the itemStyle using the setOption() API method. However, this method changes the color for all entries in a particular series. What I truly desire is to alter the color of a particular field based on its x and y position.

Here's an example of the desired functionality: In the diagram below, you can see the demo-heatmap with a blue cell at x-pos: 12a, y-pos: friday. This cell turns blue once clicked on (see example picture). https://i.sstatic.net/vx72T.png

angulartypescriptechartsngx-echarts

Answer №1

To create a second series that only includes the specific heatmap cell, follow these steps:

series: [
    {
    ...
    },
    {
        type: 'heatmap',
        data: [[0, 1, 1]],
    },
]

Then, utilize a secondary visual map that targets the second series (remember, visual maps are applied sequentially):

visualMap: [
    {
    ...
    },
    {
      seriesIndex: 1,
      show: false,
      inRange: {color: 'lightblue'},
    }
  ],

You can view an example.

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