A jQuery extension that reports the locations of clicks in the SVG coordinate system

report_locations.js

(function(){
  var transform = function(el,pt){
    return pt.matrixTransform( el.getScreenCTM().inverse() );
  };
 
  $.fn.extend({
    reportLocations : function(callback){
      var $this = this;
      var svg = $this.closest('svg')[0];
      var pt = svg.createSVGPoint();
      var el = $this[0];
      this.on("click",function(e){
        pt.x = e.clientX; pt.y = e.clientY;
        var transformedPt = pt.matrixTransform( el.getScreenCTM().inverse() );
        callback.call($this,e,transformedPt)
      });
    }
  });
}())