Customizing the Zoom functionality in the Mouse wheel event.

[Elanchezhiyan]

Hello Team,
I am trying to change the chart zoom functionality to a Mouse wheel like Google maps zoom. Is there any possible way to achieve that? If so how?

[Thangaraj Raman]

@elanchezhiyan,

You can zoom the chart using mousewheel by attaching wheel event to the chart. Please find the code snippet below.

document.getElementsByClassName("canvasjs-chart-canvas")[1].addEventListener("wheel", function(e){
  e.preventDefault();
  
  if(e.clientX < chart.plotArea.x1 || e.clientX > chart.plotArea.x2 || e.clientY < chart.plotArea.y1 || e.clientY > chart.plotArea.y2)
  	return;
    
  var axisX = chart.axisX[0];
  var viewportMin = axisX.get("viewportMinimum"),
      viewportMax = axisX.get("viewportMaximum"),
      interval = axisX.get("minimum");

  var newViewportMin, newViewportMax;

  if (e.deltaY < 0) {
    newViewportMin = viewportMin + interval;
    newViewportMax = viewportMax - interval;
  }
  else if (e.deltaY > 0) {
    newViewportMin = viewportMin - interval;
    newViewportMax = viewportMax + interval;
  }

  if(newViewportMin >= chart.axisX[0].get("minimum") && newViewportMax <= chart.axisX[0].get("maximum") && (newViewportMax - newViewportMin) > (2 * interval)){
    chart.axisX[0].set("viewportMinimum", newViewportMin, false);
    chart.axisX[0].set("viewportMaximum", newViewportMax);
  }

});

Please take a look at this JSFiddle for a working example.

—
Thangaraj Raman
Team CanvasJS

[Elanchezhiyan]

Hello @Thangaraj Raman,
In this, the X-axis only gets Zoomed but we need both X-axis and Y-axis to get zoomed equally like Google map.

[Elanchezhiyan]

Hello @Thangaraj Raman,

Is there is any update in this.

[Thangaraj Raman]

@elanchezhiyan,

You can achieve zooming using mouse wheel by updating the viewportMinimum and viewportMaximum for both x-axis and y-axis based on the mouse position.

Please check this JSFiddle for a working example.

—
Thangaraj Raman
Team CanvasJS

[Diano4ka]

@thangaraj-raman Hello! I tried zooming according to your example and for some reason it didn’t work. Please tell me what is my mistake?
https://jsfiddle.net/mtds437a/1/

[Thangaraj Raman]

@diano4ka,

The example that I shared earlier was created for a numeric axis, however your example has a date-time axis. Please check this updated JSFiddle for an example on zooming using mouse wheel for a date-time axis.

—
Thangaraj Raman
Team CanvasJS