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| author | Timothy Pearson <kb9vqf@pearsoncomputing.net> | 2011-07-10 15:24:15 -0500 |
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| committer | Timothy Pearson <kb9vqf@pearsoncomputing.net> | 2011-07-10 15:24:15 -0500 |
| commit | bd0f3345a938b35ce6a12f6150373b0955b8dd12 (patch) | |
| tree | 7a520322212d48ebcb9fbe1087e7fca28b76185c /doc/html/qpointarray.html | |
| download | qt3-bd0f3345a938b35ce6a12f6150373b0955b8dd12.tar.gz qt3-bd0f3345a938b35ce6a12f6150373b0955b8dd12.zip | |
Add Qt3 development HEAD version
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| -rw-r--r-- | doc/html/qpointarray.html | 285 |
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diff --git a/doc/html/qpointarray.html b/doc/html/qpointarray.html new file mode 100644 index 0000000..1c4e19b --- /dev/null +++ b/doc/html/qpointarray.html @@ -0,0 +1,285 @@ +<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> +<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/src/kernel/qpointarray.cpp:47 --> +<html> +<head> +<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"> +<title>QPointArray Class</title> +<style type="text/css"><!-- +fn { margin-left: 1cm; text-indent: -1cm; } +a:link { color: #004faf; text-decoration: none } +a:visited { color: #672967; text-decoration: none } +body { background: #ffffff; color: black; } +--></style> +</head> +<body> + +<table border="0" cellpadding="0" cellspacing="0" width="100%"> +<tr bgcolor="#E5E5E5"> +<td valign=center> + <a href="index.html"> +<font color="#004faf">Home</font></a> + | <a href="classes.html"> +<font color="#004faf">All Classes</font></a> + | <a href="mainclasses.html"> +<font color="#004faf">Main Classes</font></a> + | <a href="annotated.html"> +<font color="#004faf">Annotated</font></a> + | <a href="groups.html"> +<font color="#004faf">Grouped Classes</font></a> + | <a href="functions.html"> +<font color="#004faf">Functions</font></a> +</td> +<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> + +<p>The QPointArray class provides an array of points. +<a href="#details">More...</a> +<p><tt>#include <<a href="qpointarray-h.html">qpointarray.h</a>></tt> +<p>Inherits <a href="qmemarray.html">QMemArray</a><QPoint>. +<p><a href="qpointarray-members.html">List of all member functions.</a> +<h2>Public Members</h2> +<ul> +<li class=fn><a href="#QPointArray"><b>QPointArray</b></a> ()</li> +<li class=fn><a href="#~QPointArray"><b>~QPointArray</b></a> ()</li> +<li class=fn><a href="#QPointArray-2"><b>QPointArray</b></a> ( int size )</li> +<li class=fn><a href="#QPointArray-3"><b>QPointArray</b></a> ( const QPointArray & a )</li> +<li class=fn><a href="#QPointArray-4"><b>QPointArray</b></a> ( const QRect & r, bool closed = FALSE )</li> +<li class=fn>QPointArray & <a href="#operator-eq"><b>operator=</b></a> ( const QPointArray & a )</li> +<li class=fn>QPointArray <a href="#copy"><b>copy</b></a> () const</li> +<li class=fn>void <a href="#translate"><b>translate</b></a> ( int dx, int dy )</li> +<li class=fn>QRect <a href="#boundingRect"><b>boundingRect</b></a> () const</li> +<li class=fn>void <a href="#point"><b>point</b></a> ( uint index, int * x, int * y ) const</li> +<li class=fn>QPoint <a href="#point-2"><b>point</b></a> ( uint index ) const</li> +<li class=fn>void <a href="#setPoint"><b>setPoint</b></a> ( uint index, int x, int y )</li> +<li class=fn>void <a href="#setPoint-2"><b>setPoint</b></a> ( uint i, const QPoint & p )</li> +<li class=fn>bool <a href="#putPoints"><b>putPoints</b></a> ( int index, int nPoints, int firstx, int firsty, ... )</li> +<li class=fn>bool <a href="#putPoints-3"><b>putPoints</b></a> ( int index, int nPoints, const QPointArray & from, int fromIndex = 0 )</li> +<li class=fn>void <a href="#makeArc"><b>makeArc</b></a> ( int x, int y, int w, int h, int a1, int a2 )</li> +<li class=fn>void <a href="#makeEllipse"><b>makeEllipse</b></a> ( int x, int y, int w, int h )</li> +<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> +<li class=fn>QPointArray <a href="#cubicBezier"><b>cubicBezier</b></a> () const</li> +</ul> +<h2>Related Functions</h2> +<ul> +<li class=fn>QDataStream & <a href="#operator-lt-lt"><b>operator<<</b></a> ( QDataStream & s, const QPointArray & a )</li> +<li class=fn>QDataStream & <a href="#operator-gt-gt"><b>operator>></b></a> ( QDataStream & s, QPointArray & a )</li> +</ul> +<hr><a name="details"></a><h2>Detailed Description</h2> + + +The QPointArray class provides an array of points. +<p> + + +<p> A QPointArray is an array of <a href="qpoint.html">QPoint</a> objects. In addition to the +functions provided by <a href="qmemarray.html">QMemArray</a>, QPointArray provides some +point-specific functions. +<p> For convenient reading and writing of the point data use +setPoints(), <a href="#putPoints">putPoints</a>(), <a href="#point">point</a>(), and <a href="#setPoint">setPoint</a>(). +<p> For geometry operations use <a href="#boundingRect">boundingRect</a>() and <a href="#translate">translate</a>(). There +is also the <a href="qwmatrix.html#map">QWMatrix::map</a>() function for more general +transformations of QPointArrays. You can also create arcs and +ellipses with <a href="#makeArc">makeArc</a>() and <a href="#makeEllipse">makeEllipse</a>(). +<p> Among others, QPointArray is used by <a href="qpainter.html#drawLineSegments">QPainter::drawLineSegments</a>(), +<a href="qpainter.html#drawPolyline">QPainter::drawPolyline</a>(), <a href="qpainter.html#drawPolygon">QPainter::drawPolygon</a>() and +<a href="qpainter.html#drawCubicBezier">QPainter::drawCubicBezier</a>(). +<p> Note that because this class is a QMemArray, copying an array and +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: +<p> <pre> + void drawGiraffe( const QPointArray & r, QPainter * p ) + { + QPointArray tmp = r; + tmp.<a href="qmemarray.html#detach">detach</a>(); + // some code that modifies tmp + p->drawPoints( tmp ); + } + </pre> + +<p> If you forget the tmp.detach(), the const array will be modified. +<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>. + +<hr><h2>Member Function Documentation</h2> +<h3 class=fn><a name="QPointArray"></a>QPointArray::QPointArray () +</h3> + +<p> Constructs a null point array. +<p> <p>See also <a href="qmemarray.html#isNull">isNull</a>(). + +<h3 class=fn><a name="QPointArray-2"></a>QPointArray::QPointArray ( int size ) +</h3> + +<p> Constructs a point array with room for <em>size</em> points. Makes a +null array if <em>size</em> == 0. +<p> <p>See also <a href="qmemarray.html#resize">resize</a>() and <a href="qmemarray.html#isNull">isNull</a>(). + +<h3 class=fn><a name="QPointArray-3"></a>QPointArray::QPointArray ( const <a href="qpointarray.html">QPointArray</a> & a ) +</h3> + +<p> Constructs a <a href="shclass.html#shallow-copy">shallow copy</a> of the point array <em>a</em>. +<p> <p>See also <a href="#copy">copy</a>() and <a href="qmemarray.html#detach">detach</a>(). + +<h3 class=fn><a name="QPointArray-4"></a>QPointArray::QPointArray ( const <a href="qrect.html">QRect</a> & r, bool closed = FALSE ) +</h3> +Constructs a point array from the rectangle <em>r</em>. +<p> If <em>closed</em> 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(). +<p> If <em>closed</em> is TRUE, then a fifth point is set to r.topLeft(). + +<h3 class=fn><a name="~QPointArray"></a>QPointArray::~QPointArray () +</h3> + +<p> Destroys the point array. + +<h3 class=fn><a href="qrect.html">QRect</a> <a name="boundingRect"></a>QPointArray::boundingRect () const +</h3> +Returns the bounding rectangle of the points in the array, or +<a href="qrect.html">QRect</a>(0,0,0,0) if the array is empty. + +<h3 class=fn><a href="qpointarray.html">QPointArray</a> <a name="copy"></a>QPointArray::copy () const +</h3> + +<p> Creates a <a href="shclass.html#deep-copy">deep copy</a> of the array. +<p> <p>See also <a href="qmemarray.html#detach">detach</a>(). + +<h3 class=fn><a href="qpointarray.html">QPointArray</a> <a name="cubicBezier"></a>QPointArray::cubicBezier () const +</h3> +Returns the Bezier points for the four control points in this +array. + +<h3 class=fn>void <a name="makeArc"></a>QPointArray::makeArc ( int x, int y, int w, int h, int a1, int a2 ) +</h3> +Sets the points of the array to those describing an arc of an +ellipse with size, width <em>w</em> by height <em>h</em>, and position (<em>x</em>, +<em>y</em>), starting from angle <em>a1</em> and spanning by angle <em>a2</em>. The +resulting array has sufficient resolution for pixel accuracy (see +the overloaded function which takes an additional <a href="qwmatrix.html">QWMatrix</a> +parameter). +<p> 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. +<p> See the <a href="qcanvasellipse.html#anglediagram">angle diagram</a>. + +<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 ) +</h3> +This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> Sets the points of the array to those describing an arc of an +ellipse with width <em>w</em> and height <em>h</em> and position (<em>x</em>, <em>y</em>), +starting from angle <em>a1</em>, and spanning angle by <em>a2</em>, and +transformed by the matrix <em>xf</em>. The resulting array has +sufficient resolution for pixel accuracy. +<p> 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. +<p> See the <a href="qcanvasellipse.html#anglediagram">angle diagram</a>. + +<h3 class=fn>void <a name="makeEllipse"></a>QPointArray::makeEllipse ( int x, int y, int w, int h ) +</h3> +Sets the points of the array to those describing an ellipse with +size, width <em>w</em> by height <em>h</em>, and position (<em>x</em>, <em>y</em>). +<p> The returned array has sufficient resolution for use as pixels. + +<h3 class=fn><a href="qpointarray.html">QPointArray</a> & <a name="operator-eq"></a>QPointArray::operator= ( const <a href="qpointarray.html">QPointArray</a> & a ) +</h3> + +<p> Assigns a <a href="shclass.html#shallow-copy">shallow copy</a> of <em>a</em> to this point array and returns a +reference to this point array. +<p> Equivalent to <a href="qmemarray.html#assign">assign</a>(a). +<p> <p>See also <a href="#copy">copy</a>() and <a href="qmemarray.html#detach">detach</a>(). + +<h3 class=fn>void <a name="point"></a>QPointArray::point ( uint index, int * x, int * y ) const +</h3> +Reads the coordinates of the point at position <em>index</em> within the +array and writes them into <em>*x</em> and <em>*y</em>. + +<h3 class=fn><a href="qpoint.html">QPoint</a> <a name="point-2"></a>QPointArray::point ( uint index ) const +</h3> +This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> Returns the point at position <em>index</em> within the array. + +<h3 class=fn>bool <a name="putPoints"></a>QPointArray::putPoints ( int index, int nPoints, int firstx, int firsty, ... ) +</h3> +Copies <em>nPoints</em> points from the variable argument list into this +point array from position <em>index</em>, and resizes the point array if +<tt>index+nPoints</tt> exceeds the size of the array. +<p> Returns TRUE if successful, or FALSE if the array could not be +resized (typically due to lack of memory). +<p> 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: +<p> <pre> + QPointArray a( 1 ); + a[0] = QPoint( 4, 5 ); + a.<a href="#putPoints">putPoints</a>( 1, 2, 6,7, 8,9 ); // index == 1, points == 2 + </pre> + +<p> This has the same result, but here putPoints overwrites rather +than extends: +<pre> + QPointArray a( 3 ); + a.<a href="#putPoints">putPoints</a>( 0, 3, 4,5, 0,0, 8,9 ); + a.<a href="#putPoints">putPoints</a>( 1, 1, 6,7 ); + </pre> + +<p> The points are given as a sequence of integers, starting with <em>firstx</em> then <em>firsty</em>, and so on. +<p> <p>See also <a href="qmemarray.html#resize">resize</a>(). + +<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 ) +</h3> +This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> This version of the function copies <em>nPoints</em> from <em>from</em> into +this array, starting at <em>index</em> in this array and <em>fromIndex</em> in +<em>from</em>. <em>fromIndex</em> is 0 by default. +<p> <pre> + QPointArray a; + a.<a href="#putPoints">putPoints</a>( 0, 3, 1,2, 0,0, 5,6 ); + // a is now the three-point array ( 1,2, 0,0, 5,6 ); + QPointArray b; + b.<a href="#putPoints">putPoints</a>( 0, 3, 4,4, 5,5, 6,6 ); + // b is now ( 4,4, 5,5, 6,6 ); + a.<a href="#putPoints">putPoints</a>( 2, 3, b ); + // a is now ( 1,2, 0,0, 4,4, 5,5, 6,6 ); + </pre> + + +<h3 class=fn>void <a name="setPoint"></a>QPointArray::setPoint ( uint index, int x, int y ) +</h3> +Sets the point at position <em>index</em> in the array to <em>(x, y)</em>. + +<p>Example: <a href="themes-example.html#x231">themes/wood.cpp</a>. +<h3 class=fn>void <a name="setPoint-2"></a>QPointArray::setPoint ( uint i, const <a href="qpoint.html">QPoint</a> & p ) +</h3> + +<p> This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> Sets the point at array index <em>i</em> to <em>p</em>. + +<h3 class=fn>void <a name="translate"></a>QPointArray::translate ( int dx, int dy ) +</h3> +Translates all points in the array by <em>(dx, dy)</em>. + +<hr><h2>Related Functions</h2> +<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 ) +</h3> + +<p> Writes the point array, <em>a</em> to the stream <em>s</em> and returns a +reference to the stream. +<p> <p>See also <a href="datastreamformat.html">Format of the QDataStream operators</a>. + +<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 ) +</h3> + +<p> Reads a point array, <em>a</em> from the stream <em>s</em> and returns a +reference to the stream. +<p> <p>See also <a href="datastreamformat.html">Format of the QDataStream operators</a>. + +<!-- eof --> +<hr><p> +This file is part of the <a href="index.html">Qt toolkit</a>. +Copyright © 1995-2007 +<a href="http://www.trolltech.com/">Trolltech</a>. 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