CGRectInset(_:_:_:)
Returns a rectangle that is smaller or larger than the source rectangle, with the same center point.
Declaration
func CGRectInset(_ rect: CGRect, _ dx: CGFloat, _ dy: CGFloat) -> CGRectParameters
- rect:
The source Cgrect structure.
- dx:
The x-coordinate value to use for adjusting the source rectangle. To create an inset rectangle, specify a positive value. To create a larger, encompassing rectangle, specify a negative value.
- dy:
The y-coordinate value to use for adjusting the source rectangle. To create an inset rectangle, specify a positive value. To create a larger, encompassing rectangle, specify a negative value.
Return Value
A rectangle. The origin value is offset in the x-axis by the distance specified by the dx parameter and in the y-axis by the distance specified by the dy parameter, and its size adjusted by (2*dx,2*dy), relative to the source rectangle. If dx and dy are positive values, then the rectangle’s size is decreased. If dx and dy are negative values, the rectangle’s size is increased.
Discussion
The rectangle is standardized and then the inset parameters are applied. If the resulting rectangle would have a negative height or width, a null rectangle is returned.