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canvas: provide Rect::shrink () with four arguments

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Paul Davis 2021-08-30 17:39:39 -06:00
parent 2aa313eb4e
commit b47fbc91e0
1 changed files with 9 additions and 0 deletions
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9
libs/canvas/canvas/types.h
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@ -168,6 +168,15 @@ struct LIBCANVAS_API Rect
x1 - amount, y1 - amount);
}
Rect shrink (Distance top, Distance right, Distance bottom, Distance left) const throw () {
/* This isn't the equivalent of expand (-distance) because
of the peculiarities of canvas_safe_add() with negative values.
Maybe.
*/
return Rect (canvas_safe_add (x0, left), canvas_safe_add (y0, top),
x1 - right, y1 - bottom);
}
bool contains (Duple const & point) const throw () {
return point.x >= x0 && point.x < x1 && point.y >= y0 && point.y < y1;
}