/// <summary>
/// Draws a rectangle without filling the middle.
/// </summary>
/// <param name="sb">The SpriteBatch used for this rectangle draw.</param>
/// <param name="pos">The position, top-left, of the rectangle.</param>
/// <param name="size">The size of the rectangle.</param>
/// <param name="c">The color of the rectangle.</param>
/// <param name="layer">The layer on which to draw the rectangle.</param>
public static void DrawEmptyRectangle(SpriteBatch sb, Vector2 pos, Vector2 size, Color c, float layer)
{
Vector2 topLeft = pos;
Vector2 topRight = new Vector2(pos.X + size.X, pos.Y);
Vector2 bottomRight = new Vector2(pos.X + size.X, pos.Y + size.Y);
Vector2 bottomLeft = new Vector2(pos.X, pos.Y + size.Y);
DrawingTools.DrawLine(sb, topLeft, topRight, c, layer);
DrawingTools.DrawLine(sb, topRight, bottomRight, c, layer);
DrawingTools.DrawLine(sb, bottomRight, bottomLeft, c, layer);
DrawingTools.DrawLine(sb, bottomLeft, topLeft, c, layer);
}