j2DX1 = (float) rangeAxis.valueToJava2D(this.y1, dataArea, 
                    rangeEdge);
            j2DY2 = (float) domainAxis.valueToJava2D(this.x2, dataArea, 
                    domainEdge);
            j2DX2 = (float) rangeAxis.valueToJava2D(this.y2, dataArea, 
                    rangeEdge);