code: function ( inPtA, inPtB ) {
  		var deltaY = inPtA.y - inPtB.y;
  		if ( deltaY < PNLTRI.Math.EPSILON_N ) {
  			return -1;
  		} else if ( deltaY > PNLTRI.Math.EPSILON_P ) {
  			return 1;
  		} else {
  			var deltaX = inPtA.x - inPtB.x;
  			if ( deltaX < PNLTRI.Math.EPSILON_N ) {
  				return -1;
  			} else if ( deltaX > PNLTRI.Math.EPSILON_P ) {
  				return  1;
  			} else {
  				return  0;
  			}
  		}
  	}
docs: like compare (<=>) yA > yB resp. xA > xB: 1, equal: 0, otherwise: -1