trigger a brush programmatically & test it with jasmine

[aziz maalej]

Hi all,

I have a brush having a "brushstart" and "brushend" events:

var oldRangeLimits;

brush

    .on('brushstart', function (){

        oldRangeLimits = brush.extent();

    })

    .on('brush', function () {

        var s = brush.extent();

        //the user is moving the whole brush

        if(oldRangeLimits[0] !== s[0] && oldRangeLimits[1] !== s[1]){

           

        }

        //the user is moving the left brush handler

        else if(oldRangeLimits[0] !== s[0]){

            

        }

        //the user is moving the right brush handler

        else if(oldRangeLimits[1] !== s[1]){

        }

    })

And I need to test what's happening in the "brush" event callback, when the brush is triggered programatically  having:

- The range extent [0..20],

- The brush extent [5..15],

I tell the brush to change its extent from [5..15] to [1..19]:

d3.select('.brush')

            .call(brush.extent([1, 19]))

            .call(brush.event);

 

the problem is that call(brush.event) will trigger the brushstart event which will set the brush extent to [1..19] and then in the brush event callback, any of the IF statements will pass.

Any Help please.