if (y0 >= 0.0) {
            	if (orientation == PlotOrientation.VERTICAL) {
                    left.moveTo(transX1, transStack1);
                    left.lineTo(transX1, transY1);
                    left.lineTo(transXLeft, transStackLeft);
            	}
            	else {
                    left.moveTo(transStack1, transX1);
                    left.lineTo(transY1, transX1);
                    left.lineTo(transStackLeft, transXLeft);
            	}
                left.clone();