<!-- TGDimension.md --- 
;; 
;; Description: 
;; Author: Hongyi Wu(吴鸿毅)
;; Email: wuhongyi@qq.com 
;; Created: 五 1月 27 21:49:05 2017 (+0800)
;; Last-Updated: 三 9月 16 10:58:02 2020 (+0800)
;;           By: Hongyi Wu(吴鸿毅)
;;     Update #: 2
;; URL: http://wuhongyi.cn -->

# TGDimension*

TGDimension, TGPosition, TGLongPosition, TGInsets and TGRectangle    
                                                                    
Several small geometry classes that implement dimensions             
(width and height), positions (x and y), insets and rectangles.      
They are trivial and their members are public.  


## class

**TGDimension**

```cpp
   UInt_t  fWidth;       // width
   UInt_t  fHeight;      // height

   TGDimension(): fWidth(0), fHeight(0) { }
   TGDimension(UInt_t width, UInt_t height): fWidth(width), fHeight(height) { }
   TGDimension(const TGDimension &d): fWidth(d.fWidth), fHeight(d.fHeight) { }
   virtual ~TGDimension() { }

   Bool_t operator==(const TGDimension &b) const
      { return ((fWidth == b.fWidth) && (fHeight == b.fHeight)); }
   TGDimension operator-(const TGDimension &b) const
      { return TGDimension(fWidth - b.fWidth, fHeight - b.fHeight); }
   TGDimension operator+(const TGDimension &b) const
      { return TGDimension(fWidth + b.fWidth, fHeight + b.fHeight); }
```


**TGPosition**

```cpp
   Int_t  fX;         // x position
   Int_t  fY;         // y position

   TGPosition(): fX(0), fY(0) { }
   TGPosition(Int_t xc, Int_t yc): fX(xc), fY(yc) { }
   TGPosition(const TGPosition &p): fX(p.fX), fY(p.fY) { }
   virtual ~TGPosition() { }

   Bool_t operator==(const TGPosition &b) const
      { return ((fX == b.fX) && (fY == b.fY)); }
   TGPosition operator-(const TGPosition &b) const
      { return TGPosition(fX - b.fX, fY - b.fY); }
   TGPosition operator+(const TGPosition &b) const
      { return TGPosition(fX + b.fX, fY + b.fY); }
```


**TGLongPosition**

```cpp
   Long_t  fX;         // x position
   Long_t  fY;         // y position

   TGLongPosition(): fX(0), fY(0) { }
   TGLongPosition(Long_t xc, Long_t yc): fX(xc), fY(yc) { }
   TGLongPosition(const TGLongPosition &p): fX(p.fX), fY(p.fY) { }
   virtual ~TGLongPosition() { }

   Bool_t operator==(const TGLongPosition &b) const
      { return ((fX == b.fX) && (fY == b.fY)); }
   TGLongPosition operator-(const TGLongPosition &b) const
      { return TGLongPosition(fX - b.fX, fY - b.fY); }
   TGLongPosition operator+(const TGLongPosition &b) const
      { return TGLongPosition(fX + b.fX, fY + b.fY); }
```


**TGInsets**

```cpp
   Int_t  fL;    // left
   Int_t  fR;    // right
   Int_t  fT;    // top
   Int_t  fB;    // bottom

   TGInsets(): fL(0), fR(0), fT(0), fB(0) { }
   TGInsets(Int_t lf, Int_t rg, Int_t tp, Int_t bt):
      fL(lf), fR(rg), fT(tp), fB(bt) { }
   TGInsets(const TGInsets &in):
      fL(in.fL), fR(in.fR), fT(in.fT), fB(in.fB) { }
   virtual ~TGInsets() { }

   Bool_t operator==(const TGInsets &in) const
      { return ((fL == in.fL) && (fR == in.fR) && (fT == in.fT) && (fB == in.fB)); }
```


**TGRectangle**

```cpp
   Int_t         fX;    // x position
   Int_t         fY;    // y position
   UInt_t        fW;    // width
   UInt_t        fH;    // height

   // constructors
   TGRectangle(): fX(0), fY(0), fW(0), fH(0) { Empty(); }
   TGRectangle(Int_t rx, Int_t ry, UInt_t rw, UInt_t rh):
                fX(rx), fY(ry), fW(rw), fH(rh) { }
   TGRectangle(const TGPosition &p, const TGDimension &d):
                fX(p.fX), fY(p.fY), fW(d.fWidth), fH(d.fHeight) { }
   TGRectangle(const TGRectangle &r):
                fX(r.fX), fY(r.fY), fW(r.fW), fH(r.fH) { }
   virtual ~TGRectangle() { }

   // methods
   Bool_t Contains(Int_t px, Int_t py) const
                { return ((px >= fX) && (px < fX + (Int_t) fW) &&
                          (py >= fY) && (py < fY + (Int_t) fH)); }
   Bool_t Contains(const TGPosition &p) const
                { return ((p.fX >= fX) && (p.fX < fX + (Int_t) fW) &&
                          (p.fY >= fY) && (p.fY < fY + (Int_t) fH)); }
   Bool_t Intersects(const TGRectangle &r) const
                { return ((fX <= r.fX + (Int_t) r.fW - 1) && (fX + (Int_t) fW - 1 >= r.fX) &&
                          (fY <= r.fY + (Int_t) r.fH - 1) && (fY + (Int_t) fH - 1 >= r.fY)); }
   Int_t Area() const
                { return (fW * fH); }
   TGDimension Size() const
                { return TGDimension(fW, fH); }
   TGPosition LeftTop() const
                { return TGPosition(fX, fY); }
   TGPosition RightBottom() const
                { return TGPosition(fX + (Int_t) fW - 1, fY + (Int_t) fH - 1); }
   void Merge(const TGRectangle &r);// Merge parameters
   void Empty() { fX = fY = 0; fW = fH = 0; }
   Bool_t IsEmpty() const { return ((fW == 0) && (fH == 0)); }
```


## code


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