/// <summary>
/// Create rectangle from center coordinates and height / width
/// </summary>
/// <param name="y">center row</param>
/// <param name="x">center column</param>
/// <param name="rows">total height</param>
/// <param name="columns">total width</param>
/// <returns>a new rectangle</returns>
public static Rectangle FromCenter(int y, int x, int rows, int columns)
{
EvenException.Check(nameof(rows), rows);
EvenException.Check(nameof(columns), columns);
OutOfRangeException.Check(nameof(rows), rows, 1);
OutOfRangeException.Check(nameof(columns), columns, 1);
var relHeight = (rows - 1) / 2;
var relWidth = (columns - 1) / 2;
var top = y - relHeight;
var left = x - relWidth;
var region = new Rectangle(left, top, columns, rows);
return(region);
}
public void EvenException_ThrowsException()
{
Assert.Catch <EvenException>(() => EvenException.Check("", 2));
}
public void EvenException_Ok()
{
EvenException.Check("", 1);
Assert.Pass();
}