What is Rectf roundout(Rect dest ) function?

Question

What is the roundout() function in Rectf. What is the exact functionality of roundOut(Rect dest) function. Can any one explain this with example how this function works?

Answer 1

public void roundOut (Rect dst)

Added in API level 1

Set the dst integer Rect by rounding "out" this rectangle, choosing the floor of top and left, and the ceiling of right and bottom.

public static double floor (double d)

Added in API level 1

Returns the double conversion of the most positive (closest to positive infinity) integer value less than or equal to the argument.

Special cases:

floor(+0.0) = +0.0
floor(-0.0) = -0.0
floor(+infinity) = +infinity
floor(-infinity) = -infinity
floor(NaN) = NaN

public static double ceil (double d) Added in API level 1

Returns the double conversion of the most negative (closest to negative infinity) integer value greater than or equal to the argument.

Special cases:

ceil(+0.0) = +0.0
ceil(-0.0) = -0.0
ceil((anything in range (-1,0)) = -0.0
ceil(+infinity) = +infinity
ceil(-infinity) = -infinity
ceil(NaN) = NaN

RectF rectF = new RectF(0.0f, 0.0f, 10.5f, 20.f);
Rect rect = new Rect();
rectF.roundOut(rect);// Now rect will contains these values Rect(0, 0, 11, 20)

//What happens inside roundOut function
Math.floor(0.0f);//Results 0
Math.floor(0.0f);//Results 0
Math.ceil(10.5f);//Results 10
Math.ceil(20.f);//Results 20

Answer 2

rountRect will give you a Rect Object.

So

   Rect rect = new Rect();

   rectFObj.roundout(rect);

Now rect contains all values of RectF object but they are now rounded off means 1.1 becomes 1

Answer 3

One of the use which I found while searching is that roundout(Rect) is used for converting from RectF to Rect, using.

rectF.roundOut(rect);

Source - What is the best way to convert from a RectF to a Rect in Android?