IBlipFill.SourceRect Property
This element specifies the portion of the blip used for the fill. Each edge of the source rectangle is defined by a percentage offset from the corresponding edge of the bounding box. A positive percentage specifies an inset, while a negative percentage specifies an outset. For example, a left offset of 25%% specifies that the left edge of the source rectangle is located to the right of the bounding box's left edge by an amount equal to 25%% of the bounding box's width.
Syntax
Unit: FlexCel.Core
property IBlipFill.SourceRect: NullableTDrawingRelativeRect