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286 lines
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286 lines
16 KiB
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<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/src/kernel/qpointarray.cpp:47 -->
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<title>QPointArray Class</title>
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<td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>QPointArray Class Reference</h1>
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<p>The QPointArray class provides an array of points.
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<a href="#details">More...</a>
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<p><tt>#include <<a href="qpointarray-h.html">qpointarray.h</a>></tt>
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<p>Inherits <a href="qmemarray.html">QMemArray</a><QPoint>.
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<p><a href="qpointarray-members.html">List of all member functions.</a>
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<h2>Public Members</h2>
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<ul>
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<li class=fn><a href="#QPointArray"><b>QPointArray</b></a> ()</li>
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<li class=fn><a href="#~QPointArray"><b>~QPointArray</b></a> ()</li>
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<li class=fn><a href="#QPointArray-2"><b>QPointArray</b></a> ( int size )</li>
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<li class=fn><a href="#QPointArray-3"><b>QPointArray</b></a> ( const QPointArray & a )</li>
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<li class=fn><a href="#QPointArray-4"><b>QPointArray</b></a> ( const QRect & r, bool closed = FALSE )</li>
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<li class=fn>QPointArray & <a href="#operator-eq"><b>operator=</b></a> ( const QPointArray & a )</li>
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<li class=fn>QPointArray <a href="#copy"><b>copy</b></a> () const</li>
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<li class=fn>void <a href="#translate"><b>translate</b></a> ( int dx, int dy )</li>
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<li class=fn>QRect <a href="#boundingRect"><b>boundingRect</b></a> () const</li>
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<li class=fn>void <a href="#point"><b>point</b></a> ( uint index, int * x, int * y ) const</li>
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<li class=fn>QPoint <a href="#point-2"><b>point</b></a> ( uint index ) const</li>
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<li class=fn>void <a href="#setPoint"><b>setPoint</b></a> ( uint index, int x, int y )</li>
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<li class=fn>void <a href="#setPoint-2"><b>setPoint</b></a> ( uint i, const QPoint & p )</li>
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<li class=fn>bool <a href="#putPoints"><b>putPoints</b></a> ( int index, int nPoints, int firstx, int firsty, ... )</li>
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<li class=fn>bool <a href="#putPoints-3"><b>putPoints</b></a> ( int index, int nPoints, const QPointArray & from, int fromIndex = 0 )</li>
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<li class=fn>void <a href="#makeArc"><b>makeArc</b></a> ( int x, int y, int w, int h, int a1, int a2 )</li>
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<li class=fn>void <a href="#makeEllipse"><b>makeEllipse</b></a> ( int x, int y, int w, int h )</li>
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<li class=fn>void <a href="#makeArc-2"><b>makeArc</b></a> ( int x, int y, int w, int h, int a1, int a2, const QWMatrix & xf )</li>
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<li class=fn>QPointArray <a href="#cubicBezier"><b>cubicBezier</b></a> () const</li>
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</ul>
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<h2>Related Functions</h2>
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<ul>
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<li class=fn>QDataStream & <a href="#operator-lt-lt"><b>operator<<</b></a> ( QDataStream & s, const QPointArray & a )</li>
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<li class=fn>QDataStream & <a href="#operator-gt-gt"><b>operator>></b></a> ( QDataStream & s, QPointArray & a )</li>
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</ul>
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<hr><a name="details"></a><h2>Detailed Description</h2>
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The QPointArray class provides an array of points.
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<p>
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<p> A QPointArray is an array of <a href="qpoint.html">QPoint</a> objects. In addition to the
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functions provided by <a href="qmemarray.html">QMemArray</a>, QPointArray provides some
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point-specific functions.
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<p> For convenient reading and writing of the point data use
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setPoints(), <a href="#putPoints">putPoints</a>(), <a href="#point">point</a>(), and <a href="#setPoint">setPoint</a>().
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<p> For geometry operations use <a href="#boundingRect">boundingRect</a>() and <a href="#translate">translate</a>(). There
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is also the <a href="qwmatrix.html#map">QWMatrix::map</a>() function for more general
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transformations of QPointArrays. You can also create arcs and
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ellipses with <a href="#makeArc">makeArc</a>() and <a href="#makeEllipse">makeEllipse</a>().
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<p> Among others, QPointArray is used by <a href="qpainter.html#drawLineSegments">QPainter::drawLineSegments</a>(),
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<a href="qpainter.html#drawPolyline">QPainter::drawPolyline</a>(), <a href="qpainter.html#drawPolygon">QPainter::drawPolygon</a>() and
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<a href="qpainter.html#drawCubicBezier">QPainter::drawCubicBezier</a>().
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<p> Note that because this class is a QMemArray, copying an array and
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modifying the copy modifies the original as well, i.e. a <a href="shclass.html#shallow-copy">shallow copy</a>. If you need a <a href="shclass.html#deep-copy">deep copy</a> use <a href="#copy">copy</a>() or <a href="qmemarray.html#detach">detach</a>(), for example:
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<p> <pre>
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void drawGiraffe( const QPointArray & r, QPainter * p )
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{
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QPointArray tmp = r;
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tmp.<a href="qmemarray.html#detach">detach</a>();
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// some code that modifies tmp
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p->drawPoints( tmp );
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}
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</pre>
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<p> If you forget the tmp.detach(), the const array will be modified.
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<p> <p>See also <a href="qpainter.html">QPainter</a>, <a href="qwmatrix.html">QWMatrix</a>, <a href="qmemarray.html">QMemArray</a>, <a href="graphics.html">Graphics Classes</a>, <a href="images.html">Image Processing Classes</a>, and <a href="shared.html">Implicitly and Explicitly Shared Classes</a>.
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<hr><h2>Member Function Documentation</h2>
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<h3 class=fn><a name="QPointArray"></a>QPointArray::QPointArray ()
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</h3>
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<p> Constructs a null point array.
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<p> <p>See also <a href="qmemarray.html#isNull">isNull</a>().
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<h3 class=fn><a name="QPointArray-2"></a>QPointArray::QPointArray ( int size )
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</h3>
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<p> Constructs a point array with room for <em>size</em> points. Makes a
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null array if <em>size</em> == 0.
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<p> <p>See also <a href="qmemarray.html#resize">resize</a>() and <a href="qmemarray.html#isNull">isNull</a>().
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<h3 class=fn><a name="QPointArray-3"></a>QPointArray::QPointArray ( const <a href="qpointarray.html">QPointArray</a> & a )
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</h3>
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<p> Constructs a <a href="shclass.html#shallow-copy">shallow copy</a> of the point array <em>a</em>.
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<p> <p>See also <a href="#copy">copy</a>() and <a href="qmemarray.html#detach">detach</a>().
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<h3 class=fn><a name="QPointArray-4"></a>QPointArray::QPointArray ( const <a href="qrect.html">QRect</a> & r, bool closed = FALSE )
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</h3>
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Constructs a point array from the rectangle <em>r</em>.
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<p> If <em>closed</em> is FALSE, then the point array just contains the
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following four points in the listed order: r.topLeft(),
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r.topRight(), r.bottomRight() and r.bottomLeft().
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<p> If <em>closed</em> is TRUE, then a fifth point is set to r.topLeft().
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<h3 class=fn><a name="~QPointArray"></a>QPointArray::~QPointArray ()
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</h3>
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<p> Destroys the point array.
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<h3 class=fn><a href="qrect.html">QRect</a> <a name="boundingRect"></a>QPointArray::boundingRect () const
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</h3>
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Returns the bounding rectangle of the points in the array, or
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<a href="qrect.html">QRect</a>(0,0,0,0) if the array is empty.
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<h3 class=fn><a href="qpointarray.html">QPointArray</a> <a name="copy"></a>QPointArray::copy () const
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</h3>
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<p> Creates a <a href="shclass.html#deep-copy">deep copy</a> of the array.
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<p> <p>See also <a href="qmemarray.html#detach">detach</a>().
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<h3 class=fn><a href="qpointarray.html">QPointArray</a> <a name="cubicBezier"></a>QPointArray::cubicBezier () const
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</h3>
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Returns the Bezier points for the four control points in this
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array.
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<h3 class=fn>void <a name="makeArc"></a>QPointArray::makeArc ( int x, int y, int w, int h, int a1, int a2 )
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</h3>
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Sets the points of the array to those describing an arc of an
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ellipse with size, width <em>w</em> by height <em>h</em>, and position (<em>x</em>,
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<em>y</em>), starting from angle <em>a1</em> and spanning by angle <em>a2</em>. The
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resulting array has sufficient resolution for pixel accuracy (see
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the overloaded function which takes an additional <a href="qwmatrix.html">QWMatrix</a>
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parameter).
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<p> Angles are specified in 16ths of a degree, i.e. a full circle
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equals 5760 (16*360). Positive values mean counter-clockwise,
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whereas negative values mean the clockwise direction. Zero degrees
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is at the 3 o'clock position.
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<p> See the <a href="qcanvasellipse.html#anglediagram">angle diagram</a>.
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<h3 class=fn>void <a name="makeArc-2"></a>QPointArray::makeArc ( int x, int y, int w, int h, int a1, int a2, const <a href="qwmatrix.html">QWMatrix</a> & xf )
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</h3>
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This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
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<p> Sets the points of the array to those describing an arc of an
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ellipse with width <em>w</em> and height <em>h</em> and position (<em>x</em>, <em>y</em>),
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starting from angle <em>a1</em>, and spanning angle by <em>a2</em>, and
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transformed by the matrix <em>xf</em>. The resulting array has
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sufficient resolution for pixel accuracy.
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<p> Angles are specified in 16ths of a degree, i.e. a full circle
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equals 5760 (16*360). Positive values mean counter-clockwise,
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whereas negative values mean the clockwise direction. Zero degrees
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is at the 3 o'clock position.
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<p> See the <a href="qcanvasellipse.html#anglediagram">angle diagram</a>.
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<h3 class=fn>void <a name="makeEllipse"></a>QPointArray::makeEllipse ( int x, int y, int w, int h )
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</h3>
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Sets the points of the array to those describing an ellipse with
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size, width <em>w</em> by height <em>h</em>, and position (<em>x</em>, <em>y</em>).
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<p> The returned array has sufficient resolution for use as pixels.
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<h3 class=fn><a href="qpointarray.html">QPointArray</a> & <a name="operator-eq"></a>QPointArray::operator= ( const <a href="qpointarray.html">QPointArray</a> & a )
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</h3>
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<p> Assigns a <a href="shclass.html#shallow-copy">shallow copy</a> of <em>a</em> to this point array and returns a
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reference to this point array.
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<p> Equivalent to <a href="qmemarray.html#assign">assign</a>(a).
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<p> <p>See also <a href="#copy">copy</a>() and <a href="qmemarray.html#detach">detach</a>().
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<h3 class=fn>void <a name="point"></a>QPointArray::point ( uint index, int * x, int * y ) const
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</h3>
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Reads the coordinates of the point at position <em>index</em> within the
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array and writes them into <em>*x</em> and <em>*y</em>.
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<h3 class=fn><a href="qpoint.html">QPoint</a> <a name="point-2"></a>QPointArray::point ( uint index ) const
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</h3>
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This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
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<p> Returns the point at position <em>index</em> within the array.
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<h3 class=fn>bool <a name="putPoints"></a>QPointArray::putPoints ( int index, int nPoints, int firstx, int firsty, ... )
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</h3>
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Copies <em>nPoints</em> points from the variable argument list into this
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point array from position <em>index</em>, and resizes the point array if
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<tt>index+nPoints</tt> exceeds the size of the array.
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<p> Returns TRUE if successful, or FALSE if the array could not be
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resized (typically due to lack of memory).
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<p> The example code creates an array with three points (4,5), (6,7)
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and (8,9), by expanding the array from 1 to 3 points:
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<p> <pre>
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QPointArray a( 1 );
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a[0] = QPoint( 4, 5 );
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a.<a href="#putPoints">putPoints</a>( 1, 2, 6,7, 8,9 ); // index == 1, points == 2
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</pre>
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<p> This has the same result, but here putPoints overwrites rather
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than extends:
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<pre>
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QPointArray a( 3 );
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a.<a href="#putPoints">putPoints</a>( 0, 3, 4,5, 0,0, 8,9 );
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a.<a href="#putPoints">putPoints</a>( 1, 1, 6,7 );
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</pre>
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<p> The points are given as a sequence of integers, starting with <em>firstx</em> then <em>firsty</em>, and so on.
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<p> <p>See also <a href="qmemarray.html#resize">resize</a>().
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<h3 class=fn>bool <a name="putPoints-3"></a>QPointArray::putPoints ( int index, int nPoints, const <a href="qpointarray.html">QPointArray</a> & from, int fromIndex = 0 )
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</h3>
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This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
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<p> This version of the function copies <em>nPoints</em> from <em>from</em> into
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this array, starting at <em>index</em> in this array and <em>fromIndex</em> in
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<em>from</em>. <em>fromIndex</em> is 0 by default.
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<p> <pre>
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QPointArray a;
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a.<a href="#putPoints">putPoints</a>( 0, 3, 1,2, 0,0, 5,6 );
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// a is now the three-point array ( 1,2, 0,0, 5,6 );
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QPointArray b;
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b.<a href="#putPoints">putPoints</a>( 0, 3, 4,4, 5,5, 6,6 );
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// b is now ( 4,4, 5,5, 6,6 );
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a.<a href="#putPoints">putPoints</a>( 2, 3, b );
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// a is now ( 1,2, 0,0, 4,4, 5,5, 6,6 );
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</pre>
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<h3 class=fn>void <a name="setPoint"></a>QPointArray::setPoint ( uint index, int x, int y )
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</h3>
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Sets the point at position <em>index</em> in the array to <em>(x, y)</em>.
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<p>Example: <a href="themes-example.html#x231">themes/wood.cpp</a>.
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<h3 class=fn>void <a name="setPoint-2"></a>QPointArray::setPoint ( uint i, const <a href="qpoint.html">QPoint</a> & p )
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</h3>
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<p> This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
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<p> Sets the point at array index <em>i</em> to <em>p</em>.
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<h3 class=fn>void <a name="translate"></a>QPointArray::translate ( int dx, int dy )
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</h3>
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Translates all points in the array by <em>(dx, dy)</em>.
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<hr><h2>Related Functions</h2>
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<h3 class=fn><a href="qdatastream.html">QDataStream</a> & <a name="operator-lt-lt"></a>operator<< ( <a href="qdatastream.html">QDataStream</a> & s, const <a href="qpointarray.html">QPointArray</a> & a )
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</h3>
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<p> Writes the point array, <em>a</em> to the stream <em>s</em> and returns a
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reference to the stream.
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<p> <p>See also <a href="datastreamformat.html">Format of the QDataStream operators</a>.
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<h3 class=fn><a href="qdatastream.html">QDataStream</a> & <a name="operator-gt-gt"></a>operator>> ( <a href="qdatastream.html">QDataStream</a> & s, <a href="qpointarray.html">QPointArray</a> & a )
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</h3>
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<p> Reads a point array, <em>a</em> from the stream <em>s</em> and returns a
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reference to the stream.
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<p> <p>See also <a href="datastreamformat.html">Format of the QDataStream operators</a>.
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<!-- eof -->
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<hr><p>
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This file is part of the <a href="index.html">Qt toolkit</a>.
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Copyright © 1995-2007
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<a href="http://www.trolltech.com/">Trolltech</a>. All Rights Reserved.<p><address><hr><div align=center>
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<table width=100% cellspacing=0 border=0><tr>
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<td>Copyright © 2007
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<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
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<td align=right><div align=right>Qt 3.3.8</div>
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</table></div></address></body>
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</html>
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