CSize Class

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The latest version of this topic can be found at CSize Class.

Similar to the Windows SIZE structure, which implements a relative coordinate or position.

Syntax

class CSize : public tagSIZE 

Members

Public Constructors

Public Operators

Remarks

This class is derived from the SIZE structure. This means you can pass a CSize in a parameter that calls for a SIZE and that the data members of the SIZE structure are accessible data members of CSize.

The cx and cy members of SIZE (and CSize) are public. In addition, CSize implements member functions to manipulate the SIZE structure.

Inheritance Hierarchy

tagSIZE

CSize

Requirements

Header: atltypes.h

CSize::CSize

Constructs a CSize object.

CSize() throw();
CSize( int initCX, int initCY) throw();
CSize( SIZE initSize) throw();
CSize( POINT initPt) throw();
CSize( DWORD dwSize) throw(); 

Parameters

initCX
Sets the cx member for the CSize.

initCY
Sets the cy member for the CSize.

initSize
SIZE structure or CSize object used to initialize CSize.

initPt
POINT structure or CPoint object used to initialize CSize.

dwSize
DWORD used to initialize CSize. The low-order word is the cx member and the high-order word is the cy member.

Remarks

If no arguments are given, cx and cy are initialized to zero.

Example

   CSize szEmpty;
   CSize szPointA(10, 25);

   SIZE sz;
   sz.cx = 10;
   sz.cy = 25;
   CSize szPointB(sz);

   POINT pt;
   pt.x = 10;
   pt.y = 25;
   CSize szPointC(pt);

   CPoint ptObject(10, 25);
   CSize szPointD(ptObject);   

   DWORD dw = MAKELONG(10, 25);
   CSize szPointE(dw);

   ASSERT(szPointA == szPointB);
   ASSERT(szPointB == szPointC);
   ASSERT(szPointC == szPointD);
   ASSERT(szPointD == szPointE);   

CSize::operator ==

Checks for equality between two sizes.

BOOL operator==(SIZE size) const throw(); 

Remarks

Returns nonzero if the sizes are equal, otherwize 0.

Example

   CSize sz1(135, 135);
   CSize sz2(135, 135);

   ASSERT(sz1 == sz2);

CSize::operator !=

Checks for inequality between two sizes.

BOOL operator!=(SIZE size) const throw(); 

Remarks

Returns nonzero if the sizes are not equal, otherwise 0.

Example

   CSize sz1(222, 222);
   CSize sz2(111, 111);

   ASSERT(sz1 != sz2);   

CSize::operator +=

Adds a size to this CSize.

void operator+=(SIZE size) throw(); 

Example

   CSize sz1(100, 100);
   CSize sz2(50,  25);

   sz1 += sz2;

   CSize szResult(150, 125);
   ASSERT(sz1 == szResult);

   // works with SIZE, too

   sz1 = CSize(100, 100);
   SIZE sz3;
   sz3.cx = 50;
   sz3.cy = 25;

   sz1 += sz3;
   ASSERT(sz1 == szResult);   

CSize::operator -=

Subtracts a size from this CSize.

void operator-=(SIZE size) throw(); 

Example

   CSize sz1(100, 100);
   CSize sz2(50,  25);

   sz1 -= sz2;

   CSize szResult(50, 75);
   ASSERT(sz1 == szResult);

   // works with SIZE, too

   sz1 = CSize(100, 100);
   SIZE sz3;
   sz3.cx = 50;
   sz3.cy = 25;

   sz1 -= sz3;
   ASSERT(sz1 == szResult);   

CSize::operator +

These operators add this CSize value to the value of parameter.

CSize operator+(SIZE size) const throw();
CPoint operator+(POINT point) const throw();
CRect operator+(const RECT* lpRect) const throw(); 

Remarks

See the following descriptions of the individual operators:

• operator +( size **)**This operation adds two CSize values.

• operator +( point **)**This operation offsets (moves) a POINT (or CPoint) value by this CSize value. The cx and cy members of this CSize value are added to the x and y data members of the POINT value. It is analogous to the version of CPoint::operator + that takes a SIZE parameter.

• operator +( lpRect **)**This operation offsets (moves) a RECT (or CRect) value by this CSize value. The cx and cy members of this CSize value are added to the left, top, right, and bottom data members of the RECT value. It is analogous to the version of CRect::operator + that takes a SIZE parameter.

Example

   CSize sz1(100, 100);
   CSize sz2(50,  25);
   CSize szOut;

   szOut = sz1 + sz2;

   CSize szResult(150, 125);
   ASSERT(szOut == szResult);

   // works with SIZE, too

   sz1 = CSize(100, 100);
   SIZE sz3;
   sz3.cx = 50;
   sz3.cy = 25;

   szOut = sz1 + sz3;
   ASSERT(szOut == szResult);   

CSize::operator -

The first three of these operators subtract this CSize value to the value of parameter.

CSize operator-(SIZE size) const throw();
CPoint operator-(POINT point) const throw();
CRect operator-(const RECT* lpRect) const throw();
CSize operator-() const throw(); 

Remarks

The fourth operator, the unary minus, changes the sign of the CSize value. See the following descriptions of the individual operators:

• operator -( size **)**This operation subtracts two CSize values.

• operator -( point **)**This operation offsets (moves) a POINT or CPoint value by the additive inverse of this CSize value. The cx and cy of this CSize value are subtracted from the x and y data members of the POINT value. It is analogous to the version of CPoint::operator - that takes a SIZE parameter.

• operator -( lpRect **)**This operation offsets (moves) a RECT or CRect value by the additive inverse of this CSize value. The cx and cy members of this CSize value are subtracted from the left, top, right, and bottom data members of the RECT value. It is analogous to the version of CRect::operator - that takes a SIZE parameter.

• **operator -( )**This operation returns the additive inverse of this CSize value.

Example

   CSize sz1(100, 100);
   CSize sz2(50,  25);
   CSize szOut;

   szOut = sz1 - sz2;

   CSize szResult(50, 75);
   ASSERT(szOut == szResult);

   // works with SIZE, too

   sz1 = CSize(100, 100);
   SIZE sz3;
   sz3.cx = 50;
   sz3.cy = 25;

   szOut = sz1 - sz3;
   ASSERT(szOut == szResult);   

See Also

MFC Sample MDI
Hierarchy Chart
CRect Class
CPoint Class