System.Types.TRectF

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Delphi 

TRectF = record

C++ 

struct TRectF {
  float left;
  float top;
  float right;
  float bottom;
  TRectF() _ALWAYS_INLINE
  { init(0,0,0,0); }
  TRectF(const TPointF& TL) _ALWAYS_INLINE {
    init(TL.x, TL.y, TL.x, TL.y);
  }
  TRectF(const TPointF& TL, float width, float height) _ALWAYS_INLINE {
    init (TL.x, TL.y, TL.x + width, TL.y + height);
  }
  TRectF(float l, float t, float r, float b) _ALWAYS_INLINE {
    init(l, t, r, b);
  }
  TRectF(const TPointF& TL, const TPointF& BR) _ALWAYS_INLINE {
    init(TL.x, TL.y, BR.x, BR.y);
    Normalize();
  }
  TRectF(const RECT& r) _ALWAYS_INLINE {
    init(r.left, r.top, r.right, r.bottom);
  }
  void init(float l, float t, float r, float b) {
    left = l; top = t;
    right = r; bottom = b;
  }
  TPointF& TopLeft() _ALWAYS_INLINE
  { return *((TPointF* )this); }
  TPointF& BottomRight() _ALWAYS_INLINE
  { return *((TPointF* )this+1); }
  const TPointF& TopLeft() const _ALWAYS_INLINE
  { return *((TPointF* )this); }
  const TPointF& BottomRight() const _ALWAYS_INLINE
  { return *((TPointF* )this+1); }
  float Width() const _ALWAYS_INLINE
  { return right  - left; }
  float Height() const _ALWAYS_INLINE
  { return bottom - top ; }
  static TRectF Empty() _ALWAYS_INLINE
  { return TRectF(); }
  void Normalize() _ALWAYS_INLINE {
    if (top > bottom) {
      float temp  = top;
      top = bottom;
      bottom = temp;
    }
    if (left > right) {
      float temp = left;
      left = right;
      right = temp;
    }
  }
  bool operator ==(const TRectF& rc) const
  {
    return _sameValue(left, rc.left) && _sameValue(top, rc.top) &&
           _sameValue(right, rc.right) && _sameValue(bottom, rc.bottom);
  }
  bool operator !=(const TRectF& rc) const
  {  return !(rc == *this); }
  bool IsEmpty() const _ALWAYS_INLINE {
    return _sameValue(right, left) || _sameValue(bottom, top); // differs from Delphi version
  }
  bool Contains(const TPointF& p) const _ALWAYS_INLINE {
    return ((p.x > left || _sameValue(p.x, left)) && (p.y > top || _sameValue(p.y, top)) && (p.x < right) && (p.y < bottom));
  }
  bool PtInRect(const TPointF& p) const _ALWAYS_INLINE {
    return Contains(p);
  }
  bool Contains(const TRectF& r) const _ALWAYS_INLINE {
    return Contains(r.TopLeft()) && Contains(r.BottomRight());
  }
  bool Overlaps(const TRectF &r) const _ALWAYS_INLINE {
    return IntersectsWith(r);
  }
  bool Intersects(const TRectF &r) const _ALWAYS_INLINE {
    return IntersectsWith(r);
  }
  bool IntersectsWith(const TRectF &r) const _ALWAYS_INLINE {
    return !( (BottomRight().x < r.TopLeft().x) ||
              (BottomRight().y < r.TopLeft().y) ||
              (r.BottomRight().x < TopLeft().x) ||
              (r.BottomRight().y < TopLeft().y) );
  }
  static TRectF Intersect(const TRectF &r1, const TRectF &r2);
  void Intersect(const TRectF &r);
  void Union(const TRectF &r);
  static TRectF Union(const TRectF &r1, const TRectF &r2);
  static TRectF Union(const TPointF* points, int npoints) _ALWAYS_INLINE {
    TPointF tl, br;
    if (npoints > 0) {
      tl.SetLocation(points[0]);
      br.SetLocation(points[0]);
      for (int i = npoints; --i > 0;) {
        if (points[i].x < tl.x)
          tl.x = points[i].x;
        if (points[i].x > br.x)
          br.x = points[i].x;
        if (points[i].y < tl.y)
          tl.y = points[i].y;
        if (points[i].y > br.y)
          br.y = points[i].y;
      }
    }
    return TRectF(tl, br);
  }
  void Offset(float DX, float DY) _ALWAYS_INLINE {
    left   += DX;
    right  += DX;
    top    += DY;
    bottom += DY;
  }
  void SetLocation(float X, float Y) _ALWAYS_INLINE {
      Offset(X - left, Y - top);
  }
  void SetLocation(const TPointF& p) _ALWAYS_INLINE {
      Offset(p.x - left, p.y - top);
  }
  void Inflate(float DX, float DY) _ALWAYS_INLINE {
    left   -= DX;
    right  += DX;
    top    -= DY;
    bottom += DY;
  }
  void Inflate(float l, float t, float r, float b) _ALWAYS_INLINE {
    left   -= l;
    right  += r;
    top    -= t;
    bottom += b;
  }
  void NormalizeRect() _ALWAYS_INLINE {
    float temp;
    if (left > right)
    {
      temp = left;
      left = right;
      right = temp;
    }
    if (top > bottom)
    {
      temp = top;
      top = bottom;
      bottom = temp;
    }
  }
  TPointF CenterPoint() const _ALWAYS_INLINE {
    return TPointF((left+right)/2.0F, (top+bottom)/2.0F);
  }
  TRect Ceiling() const _ALWAYS_INLINE {
    return TRect(TopLeft().Ceiling(), BottomRight().Ceiling());
  }
  TRect Truncate() const _ALWAYS_INLINE {
    return TRect(TopLeft().Truncate(), BottomRight().Truncate());
  }
  TRect Round() const _ALWAYS_INLINE {
    return TRect(TopLeft().Round(), BottomRight().Round());
  }
  TRectF CenteredRect(const TRectF &CenteredRect) const _ALWAYS_INLINE {
    float w = CenteredRect.Width();
    float h = CenteredRect.Height();
    float x = (right + left)/2.0F;
    float y = (top + bottom)/2.0F;
    return TRectF(x-w/2.0F, y-h/2.0F, x+w/2.0F, y+h/2.0F);
  }
  TRectF CenterAt(const TRectF& Bounds) const _ALWAYS_INLINE {
    TRectF result = *this;
    result.Offset(-result.left, -result.top);
    result.Offset(_roundf((Bounds.Width() - result.Width()) / 2.0f),
                  _roundf((Bounds.Height() - result.Height()) / 2.0f));
    result.Offset(Bounds.left, Bounds.top);
    return result;
  }
  float GetWidth() const _ALWAYS_INLINE {
    return right - left;
  }
  void SetWidth(float width) _ALWAYS_INLINE {
    right = left + width;
  }
  float GetHeight() const _ALWAYS_INLINE {
    return bottom - top;
  }
  void SetHeight(float height) _ALWAYS_INLINE {
    bottom = top + height;
  }
  TSizeF GetSize() const _ALWAYS_INLINE {
    return TSizeF(GetWidth(), GetHeight());
  }
  void SetSize(const TSizeF& newSize) _ALWAYS_INLINE {
    SetWidth(newSize.cx);
    SetHeight(newSize.cy);
  }
  TPointF GetLocation() const _ALWAYS_INLINE {
    return TPointF(left, top);
  }
  static float __fastcall _sqrf(float i) _ALWAYS_INLINE {
    return i*i;
  }
  static bool __fastcall _sameValue(float a, float b) _ALWAYS_INLINE {
    const float SINGLE_RESOLUTION = 1.25E-6f;
    const float SINGLE_ZERO =6.25E-37f;
    float _epsilon = (float) ((fabs(a) > fabs(b)) ? fabs(a): fabs(b)) * SINGLE_RESOLUTION;
    if (_epsilon == 0)
      _epsilon = SINGLE_ZERO; // both a and b are very little, _epsilon was 0 because of normalization
    return (a > b) ? ((a - b) <= _epsilon): ((b - a) <= _epsilon);
  }
  TRectF FitInto(const TRectF& DesignatedArea,
                 float& Ratio) const;
  TRectF FitInto(const TRectF &DesignatedArea) const _ALWAYS_INLINE {
    float Ratio;
    return FitInto(DesignatedArea,Ratio);
  }
  TRectF SnapToPixel(float Scale,
                     bool PlaceBetweenPixels = true) const _ALWAYS_INLINE {
    if (Scale <= 0.0f)
      Scale = 1.0f;
    TRectF result;
    result.left = _roundf(left * Scale) / Scale;
    result.top = _roundf(top * Scale) / Scale;
    result.SetWidth(_roundf( Width() * Scale) / Scale);
    result.SetHeight(_roundf( Height() * Scale) / Scale);
    if (PlaceBetweenPixels) {
      Scale /= 2.0f;
      result.Offset(Scale, Scale);
    }
    return result;
  }
  TRectF PlaceInto(const TRectF &DesignatedArea, THorzRectAlign HorzAlign, TVertRectAlign VertAlign) const;
  __property float Left    = { read=left,   write=left   };
  __property float Top     = { read=top,    write=top    };
  __property float Right   = { read=right,  write=right  };
  __property float Bottom  = { read=bottom, write=bottom };
  __property TSizeF Size   = { read=GetSize, write=SetSize };
  __property TPointF Location = { read=GetLocation, write=SetLocation };
};

プロパティ

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record
struct
 public
System.Types.pas
SystemTypes.h
 System.Types System.Types


説明

TRectF は、浮動小数点の座標で、四角形を定義します。

TRectF は、四角形の位置とサイズを表します。 この座標は、上下左右の側を表す 4 つの別個の Single 座標か、 左上隅および右下隅の位置を表す 2 つの点として表されます。

通常、TRectF 値はピクセル位置を表します。ピクセル座標系の原点は、画面の左上隅か、コントロールのクライアント領域の左上隅です（前者の場合は画面座標、後者の場合はクライアント座標になります）。 TRectF 値で画面上の矩形を表す場合、慣例的に、上辺と左辺は矩形の内部にあり、下辺と右辺は矩形の外部にあると見なされます。 この慣例により、矩形の幅は Right - Left、高さは Bottom - Top で、それぞれ与えられます。

関連項目

コード サンプル

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