lineX1 = domainAxis.getCategoryJava2DCoordinate(
                CategoryAnchor.MIDDLE, catIndex1, catCount, dataArea,
                domainEdge);
            lineY1 = rangeAxis.valueToJava2D(this.value1, dataArea, rangeEdge);
            lineX2 = domainAxis.getCategoryJava2DCoordinate(
                CategoryAnchor.MIDDLE, catIndex2, catCount, dataArea,
                domainEdge);