public interface Axis :
Public Interface Axis
Most charts have two axes: the category axis, usually running horizontally along the bottom of the plot area, and the value axis, usually running vertically on the left side of the plot area. 3-D charts also have the depth (series) axis along which the series names are displayed. But not all charts display axes the same way. For example, a scatter chart always has two value axes, while pie and doughnut charts have no axes at all.