Point::-=

inline const Point<T>& operator -=(const Point<T> & pt);
inline const Point<T>& operator -=(const Size<T> & sz);
inline const Point<T>& operator -=(T val);

Description

The operator -= function subtracts a set value from the x and y coordinates of the current point variable.

The following expression is used to determine the result:

   (pt1.x, pt1.y) = (pt1.x - [val, pt2.x], pt1.y - [val, pt2.y])

Parameters

Parameters	Description
const Point<T> & pt	A point whose x and y coordinate values are subtracted from the x and y coordinate values of the current point respectively.
const Size<T> & sz	A size variable containing a Width and Height component: the width variable is subtracted from the x coordinate value of the current point, and the height variable is subtracted from the y coordinate value.
T val	A fixed value that is subtracted from both the x and y coordinate values of the current point.

Return Value

A Point reference to the current string whose coordinates result from the subtraction of a fixed value (number or another Point) from the original coordinates.