normalize pointer/mouse/touch events

normalizeEvent.js

var normalizeEvent = ( function( ) {
  var getPixels = function( style ) {
    switch( style ) {
      case "thick":
        return 6;
      case "medium":
        return 4;
      case "thin":
        return 2;
      default:
        return parseInt( style, 10 );
    }
  };
  
  return function( e ) {
    e = e || window.event;
    var target = e.target || e.srcElement,
      style = target.currentStyle || window.getComputedStyle(target, null),
      rect = target.getBoundingClientRect();

    e.sceneX = e.clientX - rect.left;
    e.sceneY = e.clientY - rect.top;

    if( style.borderStyle !== "" && style.borderStyle !== "none" ) {
      e.sceneX -= getPixels( style.borderLeftWidth );
      e.sceneY -= getPixels( style.borderTopWidth );
    }

    try {
      e.target = target;
    } catch( ex ) {}
  };
}( ) );