Method shrink

include/math.hpp:430–435

Contracts each corner. */

	}
	/** Contracts each corner. */
	Rect shrink(Vec delta) const {
		Rect r;
		r.pos = pos.plus(delta);
		r.size = size.minus(delta.mult(2.f));
		return r;
	}
	/** Returns `pos + size * p` */
	Vec interpolate(Vec p) {
		return pos.plus(size.mult(p));