By default, the Points property is 0. The Points property indicates the number of points that defines the polygon. The InverseClip property inverses the current clipping region, so anything that was included in the clipping region will be excluded, and reverse. 

The following screen shot shows properties of the clipping objects relative to the layer:

To define an polygonal clip region over the layer you can use any of the following properties:

• Points, Indicates the number of points that defines the polygon.
• X, Specifies the x-radius value / expression of the clip, relative to the layer.
• Y, Specifies the y-radius value / expression of the clip, relative to the layer.

To move the clipping region you can use any of the following properties:

• OffsetX, Specifies the x-offset expression / value of the clip, relative to the layer.
• OffsetY, Specifies the y-offset expression / value of the clip, relative to the layer.

If none of these properties are calling no clipping is applied to layer.