'brushreset' event implementation

[daniel-zillion]

I found it quite advantageous to have an event fired when the brush strokes are reset by either pc.brushReset() or when a single click is detected in the chart area.

The implementation requires only three changes:

• add 'brushreset' to events array

var events = d3.dispatch
    .apply(this,["render", "resize", "highlight", "brush", "brushend", "axesreorder","brushreset"]
    .concat(d3.keys(__))),
.
.

• call the event on single click

// Okay, somewhat unexpected, but not totally unsurprising, a mousclick is
// considered a drag without move. So we have to deal with that case
if (strum && strum.p1[0] === strum.p2[0] && strum.p1[1] === strum.p2[1]) {
    removeStrum(strums);
    events.brushreset.call(pc);
}

• call the event when pc.brushReset() is called

 function brushReset(dimension) {
    __.brushed = false;
    if (g) {
      g.selectAll('.brush')
        .each(function(d) {
          d3.select(this).call(
            brushes[d].clear()
          );
        });
      pc.render();
      events.brushreset.call(pc);
    }
    return this;
  };

[jfourment]

Hi, I agree something must be done about the brushReset events. I think a call to brushReset() should simply trigger a brush event as it is a brush event. So that any listener responsible for updating a datatable would automatically do its work on a reset.