By default, the Y property is empty, which indicates the value of 0 ( top side of the layer ). The Y property is 0, if the expression is empty, missing or invalid. The Points property indicates the number of points that defines the polygon.

For instance:

• "-15", 15 pixels up to the top side of the layer
• "height / 2" indicates the half of the layer's height or the y-center of the layer
• "height", indicates the height of the layer or bottom side of the layer
• "value / 100 * height", indicates the Value percent of height of the layer, so if clip's Value percent is 25, the "value / 100 * height" expression gets a quarter of the height of the layer, or 50 gets half of it, and so on.

This property supports the following keywords:

• value keyword specifies the clip's value pointed by the clip's Value property
• width or lwidth keywords, indicates the width in pixels of the layer
• height or lheight keywords, indicates the height in pixels of the layer

Also, this property supports all constants, operators and functions defined here.

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.

The InverseClip property inverses the current clipping region, so anything that was included in the clipping region will be excluded, and reverse.