Verständnis bon Class TRect Definition

[bernhard_LA]

wie steuere ich denn ob TRect nur durch 2 TPoints oder 4 Integer Werte aufgespannt wird ?

Delphi-Quellcode:

  TRect = record
  private
    function GetWidth: Integer;
    procedure SetWidth(const Value: Integer);
    function GetHeight: Integer;
    procedure SetHeight(const Value: Integer);
    function GetSize: TSize;
    procedure SetSize(const Value: TSize);
    function GetLocation: TPoint;
  public
    constructor Create(const Origin: TPoint); overload;                              // empty rect at given origin
    constructor Create(const Origin: TPoint; Width, Height: Integer); overload;      // at TPoint of origin with width and height
    constructor Create(const Left, Top, Right, Bottom: Integer); overload;           // at x, y with width and height
    constructor Create(const P1, P2: TPoint; Normalize: Boolean = False); overload;  // with corners specified by p1 and p2
    constructor Create(const R: TRect; Normalize: Boolean = False); overload;
    class operator Equal(const Lhs, Rhs: TRect): Boolean;
    class operator NotEqual(const Lhs, Rhs: TRect): Boolean;
    class operator Add(const Lhs, Rhs: TRect): TRect;
    class operator Multiply(const Lhs, Rhs: TRect): TRect;
    class function Empty: TRect; inline; static;
    procedure NormalizeRect;
    function IsEmpty: Boolean;
    function Contains(const Pt: TPoint): Boolean; overload;
    function Contains(const R: TRect): Boolean; overload;
    function IntersectsWith(const R: TRect): Boolean;
    class function Intersect(const R1: TRect; const R2: TRect): TRect; overload; static;
    procedure Intersect(const R: TRect); overload;
    class function Union(const R1: TRect; const R2: TRect): TRect; overload; static;
    procedure Union(const R: TRect); overload;
    class function Union(const Points: Array of TPoint): TRect; overload; static;
    procedure Offset(const DX, DY: Integer); overload;
    procedure Offset(const Point: TPoint); overload;
...
...
 case Integer of
    0: (Left, Top, Right, Bottom: FixedInt);
    1: (TopLeft, BottomRight: TPoint);
  end;