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CentOS 7.0 - man page for qpointarray (centos section 3qt)

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QPointArray(3qt)								 QPointArray(3qt)

NAME
       QPointArray - Array of points

SYNOPSIS
       #include <qpointarray.h>

       Inherits QMemArray<QPoint>.

   Public Members
       QPointArray ()
       ~QPointArray ()
       QPointArray ( int size )
       QPointArray ( const QPointArray & a )
       QPointArray ( const QRect & r, bool closed = FALSE )
       QPointArray & operator= ( const QPointArray & a )
       QPointArray copy () const
       void translate ( int dx, int dy )
       QRect boundingRect () const
       void point ( uint index, int * x, int * y ) const
       QPoint point ( uint index ) const
       void setPoint ( uint index, int x, int y )
       void setPoint ( uint i, const QPoint & p )
       bool putPoints ( int index, int nPoints, int firstx, int firsty, ... )
       bool putPoints ( int index, int nPoints, const QPointArray & from, int fromIndex = 0 )
       void makeArc ( int x, int y, int w, int h, int a1, int a2 )
       void makeEllipse ( int x, int y, int w, int h )
       void makeArc ( int x, int y, int w, int h, int a1, int a2, const QWMatrix & xf )
       QPointArray cubicBezier () const

RELATED FUNCTION DOCUMENTATION
       QDataStream & operator<< ( QDataStream & s, const QPointArray & a )
       QDataStream & operator>> ( QDataStream & s, QPointArray & a )

DESCRIPTION
       The QPointArray class provides an array of points.

       A QPointArray is an array of QPoint objects. In addition to the functions provided by
       QMemArray, QPointArray provides some point-specific functions.

       For convenient reading and writing of the point data use setPoints(), putPoints(),
       point(), and setPoint().

       For geometry operations use boundingRect() and translate(). There is also the
       QWMatrix::map() function for more general transformations of QPointArrays. You can also
       create arcs and ellipses with makeArc() and makeEllipse().

       Among others, QPointArray is used by QPainter::drawLineSegments(),
       QPainter::drawPolyline(), QPainter::drawPolygon() and QPainter::drawCubicBezier().

       Note that because this class is a QMemArray, copying an array and modifying the copy
       modifies the original as well, i.e. a shallow copy. If you need a deep copy use copy() or
       detach(), for example:

	       void drawGiraffe( const QPointArray & r, QPainter * p )
	       {
		   QPointArray tmp = r;
		   tmp.detach();
		   // some code that modifies tmp
		   p->drawPoints( tmp );
	       }

       If you forget the tmp.detach(), the const array will be modified.

       See also QPainter, QWMatrix, QMemArray, Graphics Classes, Image Processing Classes, and
       Implicitly and Explicitly Shared Classes.

MEMBER FUNCTION DOCUMENTATION
QPointArray::QPointArray ()
       Constructs a null point array.

       See also isNull().

QPointArray::QPointArray ( int size )
       Constructs a point array with room for size points. Makes a null array if size == 0.

       See also resize() and isNull().

QPointArray::QPointArray ( const QPointArray & a )
       Constructs a shallow copy of the point array a.

       See also copy() and detach().

QPointArray::QPointArray ( const QRect & r, bool closed = FALSE )
       Constructs a point array from the rectangle r.

       If closed is FALSE, then the point array just contains the following four points in the
       listed order: r.topLeft(), r.topRight(), r.bottomRight() and r.bottomLeft().

       If closed is TRUE, then a fifth point is set to r.topLeft().

QPointArray::~QPointArray ()
       Destroys the point array.

QRect QPointArray::boundingRect () const
       Returns the bounding rectangle of the points in the array, or QRect(0,0,0,0) if the array
       is empty.

QPointArray QPointArray::copy () const
       Creates a deep copy of the array.

       See also detach().

QPointArray QPointArray::cubicBezier () const
       Returns the Bezier points for the four control points in this array.

void QPointArray::makeArc ( int x, int y, int w, int h, int a1, int a2 )
       Sets the points of the array to those describing an arc of an ellipse with size, width w
       by height h, and position (x, y), starting from angle a1 and spanning by angle a2. The
       resulting array has sufficient resolution for pixel accuracy (see the overloaded function
       which takes an additional QWMatrix parameter).

       Angles are specified in 16ths of a degree, i.e. a full circle equals 5760 (16*360).
       Positive values mean counter-clockwise, whereas negative values mean the clockwise
       direction. Zero degrees is at the 3 o'clock position.

       See the angle diagram.

void QPointArray::makeArc ( int x, int y, int w, int h, int a1, int a2, const QWMatrix & xf )
       This is an overloaded member function, provided for convenience. It behaves essentially
       like the above function.

       Sets the points of the array to those describing an arc of an ellipse with width w and
       height h and position (x, y), starting from angle a1, and spanning angle by a2, and
       transformed by the matrix xf. The resulting array has sufficient resolution for pixel
       accuracy.

       Angles are specified in 16ths of a degree, i.e. a full circle equals 5760 (16*360).
       Positive values mean counter-clockwise, whereas negative values mean the clockwise
       direction. Zero degrees is at the 3 o'clock position.

       See the angle diagram.

void QPointArray::makeEllipse ( int x, int y, int w, int h )
       Sets the points of the array to those describing an ellipse with size, width w by height
       h, and position (x, y).

       The returned array has sufficient resolution for use as pixels.

QPointArray &; QPointArray::operator= ( const QPointArray & a )
       Assigns a shallow copy of a to this point array and returns a reference to this point
       array.

       Equivalent to assign(a).

       See also copy() and detach().

void QPointArray::point ( uint index, int * x, int * y ) const
       Reads the coordinates of the point at position index within the array and writes them into
       *x and *y.

QPoint QPointArray::point ( uint index ) const
       This is an overloaded member function, provided for convenience. It behaves essentially
       like the above function.

       Returns the point at position index within the array.

bool QPointArray::putPoints ( int index, int nPoints, int firstx, int firsty, ... )
       Copies nPoints points from the variable argument list into this point array from position
       index, and resizes the point array if index+nPoints exceeds the size of the array.

       Returns TRUE if successful, or FALSE if the array could not be resized (typically due to
       lack of memory).

       The example code creates an array with three points (4,5), (6,7) and (8,9), by expanding
       the array from 1 to 3 points:

	       QPointArray a( 1 );
	       a[0] = QPoint( 4, 5 );
	       a.putPoints( 1, 2, 6,7, 8,9 ); // index == 1, points == 2

       This has the same result, but here putPoints overwrites rather than extends:

	       QPointArray a( 3 );
	       a.putPoints( 0, 3, 4,5, 0,0, 8,9 );
	       a.putPoints( 1, 1, 6,7 );

       The points are given as a sequence of integers, starting with firstx then firsty, and so
       on.

       See also resize().

bool QPointArray::putPoints ( int index, int nPoints, const QPointArray & from, int fromIndex = 0
       )
       This is an overloaded member function, provided for convenience. It behaves essentially
       like the above function.

       This version of the function copies nPoints from from into this array, starting at index
       in this array and fromIndex in from. fromIndex is 0 by default.

	       QPointArray a;
	       a.putPoints( 0, 3, 1,2, 0,0, 5,6 );
	       // a is now the three-point array ( 1,2, 0,0, 5,6 );
	       QPointArray b;
	       b.putPoints( 0, 3, 4,4, 5,5, 6,6 );
	       // b is now ( 4,4, 5,5, 6,6 );
	       a.putPoints( 2, 3, b );
	       // a is now ( 1,2, 0,0, 4,4, 5,5, 6,6 );

void QPointArray::setPoint ( uint index, int x, int y )
       Sets the point at position index in the array to (x, y).

       Example: themes/wood.cpp.

void QPointArray::setPoint ( uint i, const QPoint & p )
       This is an overloaded member function, provided for convenience. It behaves essentially
       like the above function.

       Sets the point at array index i to p.

void QPointArray::translate ( int dx, int dy )
       Translates all points in the array by (dx, dy).

RELATED FUNCTION DOCUMENTATION
QDataStream &; operator<< ( QDataStream & s, const QPointArray & a )
       Writes the point array, a to the stream s and returns a reference to the stream.

       See also Format of the QDataStream operators.

QDataStream &; operator>> ( QDataStream & s, QPointArray & a )
       Reads a point array, a from the stream s and returns a reference to the stream.

       See also Format of the QDataStream operators.

SEE ALSO
       http://doc.trolltech.com/qpointarray.html http://www.trolltech.com/faq/tech.html

COPYRIGHT
       Copyright 1992-2007 Trolltech ASA, http://www.trolltech.com.  See the license file
       included in the distribution for a complete license statement.

AUTHOR
       Generated automatically from the source code.

BUGS
       If you find a bug in Qt, please report it as described in
       http://doc.trolltech.com/bughowto.html.	Good bug reports help us to help you. Thank you.

       The definitive Qt documentation is provided in HTML format; it is located at
       $QTDIR/doc/html and can be read using Qt Assistant or with a web browser. This man page is
       provided as a convenience for those users who prefer man pages, although this format is
       not officially supported by Trolltech.

       If you find errors in this manual page, please report them to qt-bugs@trolltech.com.
       Please include the name of the manual page (qpointarray.3qt) and the Qt version (3.3.8).

Trolltech AS				 2 February 2007			 QPointArray(3qt)


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