Changes the given rectangle to be smaller, or larger depending on the given inset parameters.
To create an inset rectangle, use positive d_x or d_y values; to create a larger, encompassing rectangle, use
negative d_x or d_y values.
The origin of the rectangle is offset by d_x and d_y, while the size is adjusted by `(2 * d_x, 2 *
d_y)`. If d_x and d_y are positive values, the size of the rectangle is decreased; if d_x
and d_y are negative values, the size of the rectangle is increased.
If the size of the resulting inset rectangle has a negative width or height then the size will be set to zero.
| this |
a Rect |
| d_x |
the horizontal inset |
| d_y |
the vertical inset |
|
the inset rectangle |