Check whether a point is inside a rectangle.
Source position: types.pp line 526
function PtInRect( 
const Rect: TRect; 
const p: TPoint 
):Boolean; 
const Rect: TRectF; 
const p: TPointF 
):Boolean; 
PtInRect returns True if p is located inside Rect, and False if it is located outside the rectangle.
Remark:  Note that the bottom, right edges are not considered part of the rectangle, therefor a point located on one of these edges will not be considered part of the rectangle, meaning that for a record (10,10,100,100) the point (90,100) will not be considered part of the record, but 90,10 will be. 

Return the intersection of 2 rectangles. 


Return the union of 2 rectangles. 


Check whether a rectangle is empty. 


Offset the rectangle. 


Increase the rectangle in size, keeping it centered. 


Return the size of the rectangle. 