What is the method for tracking map zoom events in echarts?

I am currently utilizing Echarts along with Angular to showcase a map.

The requirement is for the map to be zoomable (which is achieved through roaming: true in the chart settings), as well as to switch to a different map upon reaching a certain level of zoom.

For instance, if the zoom is below 150%, I would like to display a map of my country featuring various regions. However, once the zoom exceeds 150%, I intend on loading a more detailed map showing territories within those regions.

Is it feasible to implement this with echarts?

While attempting to listen to mouse scroll events, I faced some challenges: My access to the event is restricted to scrolling within the echarts component and not directly on the map itself. Whenever I do scroll on the map, the zoom action occurs but no mouse scroll event is registered.

Could someone suggest a workaround to help me achieve this objective? Thank you!

angulartypescriptecharts

Answer №1

Ensure to pay attention to the zoom event in conjunction with the dataZoom event provided by the library.

'dataZoom': function(parameters, charts)
{
   x1Index = parameters['batch'][0]['startValue']; //indicating the start index of the data array
   x2Index = parameters['batch'][0]['endValue']; //determining the end index of the data array

   var currentView = charts.getOption();

   //modify the chart's options (use the same syntax as the original options used to create the charts)
   currentView['title'] = 'New Title'; //example

  charts.setOption(currentView, false); //replace the existing option. If the second parameter is true, echarts will attempt to merge options but it may not do so perfectly
}

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