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diff --git a/doc/html/qwmatrix.html b/doc/html/qwmatrix.html new file mode 100644 index 0000000..b634a15 --- /dev/null +++ b/doc/html/qwmatrix.html @@ -0,0 +1,449 @@ +<!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/qwmatrix.cpp:51 --> +<html> +<head> +<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"> +<title>QWMatrix 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>QWMatrix Class Reference</h1> + +<p>The QWMatrix class specifies 2D transformations of a +coordinate system. +<a href="#details">More...</a> +<p><tt>#include <<a href="qwmatrix-h.html">qwmatrix.h</a>></tt> +<p><a href="qwmatrix-members.html">List of all member functions.</a> +<h2>Public Members</h2> +<ul> +<li class=fn><a href="#QWMatrix"><b>QWMatrix</b></a> ()</li> +<li class=fn><a href="#QWMatrix-2"><b>QWMatrix</b></a> ( double m11, double m12, double m21, double m22, double dx, double dy )</li> +<li class=fn>void <a href="#setMatrix"><b>setMatrix</b></a> ( double m11, double m12, double m21, double m22, double dx, double dy )</li> +<li class=fn>double <a href="#m11"><b>m11</b></a> () const</li> +<li class=fn>double <a href="#m12"><b>m12</b></a> () const</li> +<li class=fn>double <a href="#m21"><b>m21</b></a> () const</li> +<li class=fn>double <a href="#m22"><b>m22</b></a> () const</li> +<li class=fn>double <a href="#dx"><b>dx</b></a> () const</li> +<li class=fn>double <a href="#dy"><b>dy</b></a> () const</li> +<li class=fn>void <a href="#map"><b>map</b></a> ( int x, int y, int * tx, int * ty ) const</li> +<li class=fn>void <a href="#map-2"><b>map</b></a> ( double x, double y, double * tx, double * ty ) const</li> +<li class=fn>QRect <a href="#mapRect"><b>mapRect</b></a> ( const QRect & rect ) const</li> +<li class=fn>QPoint <a href="#map-3"><b>map</b></a> ( const QPoint & p ) const</li> +<li class=fn>QRect map ( const QRect & r ) const <em>(obsolete)</em></li> +<li class=fn>QPointArray <a href="#map-5"><b>map</b></a> ( const QPointArray & a ) const</li> +<li class=fn>QRegion <a href="#map-6"><b>map</b></a> ( const QRegion & r ) const</li> +<li class=fn>QRegion <a href="#mapToRegion"><b>mapToRegion</b></a> ( const QRect & rect ) const</li> +<li class=fn>QPointArray <a href="#mapToPolygon"><b>mapToPolygon</b></a> ( const QRect & rect ) const</li> +<li class=fn>void <a href="#reset"><b>reset</b></a> ()</li> +<li class=fn>bool <a href="#isIdentity"><b>isIdentity</b></a> () const</li> +<li class=fn>QWMatrix & <a href="#translate"><b>translate</b></a> ( double dx, double dy )</li> +<li class=fn>QWMatrix & <a href="#scale"><b>scale</b></a> ( double sx, double sy )</li> +<li class=fn>QWMatrix & <a href="#shear"><b>shear</b></a> ( double sh, double sv )</li> +<li class=fn>QWMatrix & <a href="#rotate"><b>rotate</b></a> ( double a )</li> +<li class=fn>bool <a href="#isInvertible"><b>isInvertible</b></a> () const</li> +<li class=fn>double <a href="#det"><b>det</b></a> () const</li> +<li class=fn>QWMatrix <a href="#invert"><b>invert</b></a> ( bool * invertible = 0 ) const</li> +<li class=fn>bool <a href="#operator-eq-eq"><b>operator==</b></a> ( const QWMatrix & m ) const</li> +<li class=fn>bool <a href="#operator!-eq"><b>operator!=</b></a> ( const QWMatrix & m ) const</li> +<li class=fn>QWMatrix & <a href="#operator*-eq"><b>operator*=</b></a> ( const QWMatrix & m )</li> +<li class=fn>enum <a href="#TransformationMode-enum"><b>TransformationMode</b></a> { Points, Areas }</li> +</ul> +<h2>Static Public Members</h2> +<ul> +<li class=fn>void <a href="#setTransformationMode"><b>setTransformationMode</b></a> ( QWMatrix::TransformationMode m )</li> +<li class=fn>TransformationMode <a href="#transformationMode"><b>transformationMode</b></a> ()</li> +</ul> +<h2>Related Functions</h2> +<ul> +<li class=fn>QDataStream & <a href="#operator-lt-lt"><b>operator<<</b></a> ( QDataStream & s, const QWMatrix & m )</li> +<li class=fn>QDataStream & <a href="#operator-gt-gt"><b>operator>></b></a> ( QDataStream & s, QWMatrix & m )</li> +</ul> +<hr><a name="details"></a><h2>Detailed Description</h2> + + +The QWMatrix class specifies 2D transformations of a +coordinate system. +<p> + +<p> The standard coordinate system of a <a href="qpaintdevice.html">paint + device</a> has the origin located at the top-left position. X +values increase to the right; Y values increase downward. +<p> This coordinate system is the default for the <a href="qpainter.html">QPainter</a>, which +renders graphics in a paint device. A user-defined coordinate +system can be specified by setting a QWMatrix for the painter. +<p> Example: +<pre> + MyWidget::paintEvent( <a href="qpaintevent.html">QPaintEvent</a> * ) + { + <a href="qpainter.html">QPainter</a> p; // our painter + QWMatrix m; // our transformation matrix + m.<a href="#rotate">rotate</a>( 22.5 ); // rotated coordinate system + p.<a href="qpainter.html#begin">begin</a>( this ); // start painting + p.<a href="qpainter.html#setWorldMatrix">setWorldMatrix</a>( m ); // use rotated coordinate system + p.<a href="qpainter.html#drawText">drawText</a>( 30,20, "detator" ); // draw rotated text at 30,20 + p.<a href="qpainter.html#end">end</a>(); // painting done + } + </pre> + +<p> A matrix specifies how to translate, scale, shear or rotate the +graphics; the actual transformation is performed by the drawing +routines in <a href="qpainter.html">QPainter</a> and by <a href="qpixmap.html#xForm">QPixmap::xForm</a>(). +<p> The QWMatrix class contains a 3x3 matrix of the form: +<table align=center border=1 cellpadding=1 cellspacing=0> +<tr align=center><td>m11</td><td>m12</td><td> 0 </td></tr> +<tr align=center><td>m21</td><td>m22</td><td> 0 </td></tr> +<tr align=center><td>dx</td> <td>dy</td> <td> 1 </td></tr> +</table> +<p> A matrix transforms a point in the plane to another point: +<pre> + x' = m11*x + m21*y + dx + y' = m22*y + m12*x + dy + </pre> + +<p> The point <em>(x, y)</em> is the original point, and <em>(x', y')</em> is the +transformed point. <em>(x', y')</em> can be transformed back to <em>(x, y)</em> by performing the same operation on the <a href="#invert">inverted matrix</a>. +<p> The elements <em>dx</em> and <em>dy</em> specify horizontal and vertical +translation. The elements <em>m11</em> and <em>m22</em> specify horizontal and +vertical scaling. The elements <em>m12</em> and <em>m21</em> specify +horizontal and vertical shearing. +<p> The identity matrix has <em>m11</em> and <em>m22</em> set to 1; all others are +set to 0. This matrix maps a point to itself. +<p> Translation is the simplest transformation. Setting <em>dx</em> and <em>dy</em> will move the coordinate system <em>dx</em> units along the X axis +and <em>dy</em> units along the Y axis. +<p> Scaling can be done by setting <em>m11</em> and <em>m22</em>. For example, +setting <em>m11</em> to 2 and <em>m22</em> to 1.5 will double the height and +increase the width by 50%. +<p> Shearing is controlled by <em>m12</em> and <em>m21</em>. Setting these +elements to values different from zero will twist the coordinate +system. +<p> Rotation is achieved by carefully setting both the shearing +factors and the scaling factors. The QWMatrix also has a function +that sets <a href="#rotate">rotation</a> directly. +<p> QWMatrix lets you combine transformations like this: +<pre> + QWMatrix m; // identity matrix + m.<a href="#translate">translate</a>(10, -20); // first translate (10,-20) + m.<a href="#rotate">rotate</a>(25); // then rotate 25 degrees + m.<a href="#scale">scale</a>(1.2, 0.7); // finally scale it + </pre> + +<p> Here's the same example using basic matrix operations: +<pre> + double a = pi/180 * 25; // convert 25 to radians + double sina = sin(a); + double cosa = cos(a); + QWMatrix m1(1, 0, 0, 1, 10, -20); // translation matrix + QWMatrix m2( cosa, sina, // rotation matrix + -sina, cosa, 0, 0 ); + QWMatrix m3(1.2, 0, 0, 0.7, 0, 0); // scaling matrix + QWMatrix m; + m = m3 * m2 * m1; // combine all transformations + </pre> + +<p> <a href="qpainter.html">QPainter</a> has functions to translate, scale, shear and rotate the +coordinate system without using a QWMatrix. Although these +functions are very convenient, it can be more efficient to build a +QWMatrix and call <a href="qpainter.html#setWorldMatrix">QPainter::setWorldMatrix</a>() if you want to perform +more than a single transform operation. +<p> <p>See also <a href="qpainter.html#setWorldMatrix">QPainter::setWorldMatrix</a>(), <a href="qpixmap.html#xForm">QPixmap::xForm</a>(), <a href="graphics.html">Graphics Classes</a>, and <a href="images.html">Image Processing Classes</a>. + +<hr><h2>Member Type Documentation</h2> +<h3 class=fn><a name="TransformationMode-enum"></a>QWMatrix::TransformationMode</h3> + +<p> <!-- index transformation matrix --> +<p> QWMatrix offers two transformation modes. Calculations can either +be done in terms of points (Points mode, the default), or in +terms of area (Area mode). +<p> In Points mode the transformation is applied to the points that +mark out the shape's bounding line. In Areas mode the +transformation is applied in such a way that the area of the +contained region is correctly transformed under the matrix. +<ul> +<li><tt>QWMatrix::Points</tt> - transformations are applied to the shape's points. +<li><tt>QWMatrix::Areas</tt> - transformations are applied (e.g. to the width and +height) so that the area is transformed. +</ul><p> Example: +<p> Suppose we have a rectangle, +<tt>QRect( 10, 20, 30, 40 )</tt> and a transformation matrix +<tt>QWMatrix( 2, 0, 0, 2, 0, 0 )</tt> to double the rectangle's size. +<p> In Points mode, the matrix will transform the top-left (10,20) and +the bottom-right (39,59) points producing a rectangle with its +top-left point at (20,40) and its bottom-right point at (78,118), +i.e. with a width of 59 and a height of 79. +<p> In Areas mode, the matrix will transform the top-left point in +the same way as in Points mode to (20/40), and double the width +and height, so the bottom-right will become (69,99), i.e. a width +of 60 and a height of 80. +<p> Because integer arithmetic is used (for speed), rounding +differences mean that the modes will produce slightly different +results given the same shape and the same transformation, +especially when scaling up. This also means that some operations +are not commutative. +<p> Under Points mode, <tt>matrix * ( region1 | region2 )</tt> is not equal to +<tt>matrix * region1 | matrix * region2</tt>. Under Area mode, <tt>matrix * (pointarray[i])</tt> is not neccesarily equal to +<tt>(matrix * pointarry)[i]</tt>. +<p> <center><img src="xform.png" alt="Comparison of Points and Areas TransformationModes"></center> +<hr><h2>Member Function Documentation</h2> +<h3 class=fn><a name="QWMatrix"></a>QWMatrix::QWMatrix () +</h3> +Constructs an identity matrix. All elements are set to zero except +<em>m11</em> and <em>m22</em> (scaling), which are set to 1. + +<h3 class=fn><a name="QWMatrix-2"></a>QWMatrix::QWMatrix ( double m11, double m12, double m21, double m22, double dx, double dy ) +</h3> +Constructs a matrix with the elements, <em>m11</em>, <em>m12</em>, <em>m21</em>, <em>m22</em>, <em>dx</em> and <em>dy</em>. + +<h3 class=fn>double <a name="det"></a>QWMatrix::det () const +</h3> + +<p> Returns the matrix's determinant. + +<h3 class=fn>double <a name="dx"></a>QWMatrix::dx () const +</h3> + +<p> Returns the horizontal translation. + +<h3 class=fn>double <a name="dy"></a>QWMatrix::dy () const +</h3> + +<p> Returns the vertical translation. + +<h3 class=fn><a href="qwmatrix.html">QWMatrix</a> <a name="invert"></a>QWMatrix::invert ( bool * invertible = 0 ) const +</h3> +Returns the inverted matrix. +<p> If the matrix is singular (not invertible), the identity matrix is +returned. +<p> If <em>invertible</em> is not 0: the value of <em>*invertible</em> is set +to TRUE if the matrix is invertible; otherwise <em>*invertible</em> is +set to FALSE. +<p> <p>See also <a href="#isInvertible">isInvertible</a>(). + +<p>Example: <a href="tutorial1-14.html#x2433">t14/cannon.cpp</a>. +<h3 class=fn>bool <a name="isIdentity"></a>QWMatrix::isIdentity () const +</h3> +Returns TRUE if the matrix is the identity matrix; otherwise returns FALSE. +<p> <p>See also <a href="#reset">reset</a>(). + +<h3 class=fn>bool <a name="isInvertible"></a>QWMatrix::isInvertible () const +</h3> + +<p> Returns TRUE if the matrix is invertible; otherwise returns FALSE. +<p> <p>See also <a href="#invert">invert</a>(). + +<h3 class=fn>double <a name="m11"></a>QWMatrix::m11 () const +</h3> + +<p> Returns the X scaling factor. + +<h3 class=fn>double <a name="m12"></a>QWMatrix::m12 () const +</h3> + +<p> Returns the vertical shearing factor. + +<h3 class=fn>double <a name="m21"></a>QWMatrix::m21 () const +</h3> + +<p> Returns the horizontal shearing factor. + +<h3 class=fn>double <a name="m22"></a>QWMatrix::m22 () const +</h3> + +<p> Returns the Y scaling factor. + +<h3 class=fn>void <a name="map"></a>QWMatrix::map ( int x, int y, int * tx, int * ty ) const +</h3> +Transforms ( <em>x</em>, <em>y</em> ) to ( <em>*tx</em>, <em>*ty</em> ) using the formulae: +<p> <pre> + *tx = m11*x + m21*y + dx (rounded to the nearest integer) + *ty = m22*y + m12*x + dy (rounded to the nearest integer) + </pre> + + +<p>Examples: <a href="tutorial1-14.html#x2434">t14/cannon.cpp</a> and <a href="xform-example.html#x1278">xform/xform.cpp</a>. +<h3 class=fn>void <a name="map-2"></a>QWMatrix::map ( double x, double y, double * tx, double * ty ) const +</h3> +This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> Transforms ( <em>x</em>, <em>y</em> ) to ( <em>*tx</em>, <em>*ty</em> ) using the +following formulae: +<p> <pre> + *tx = m11*x + m21*y + dx + *ty = m22*y + m12*x + dy + </pre> + + +<h3 class=fn><a href="qpoint.html">QPoint</a> <a name="map-3"></a>QWMatrix::map ( const <a href="qpoint.html">QPoint</a> & p ) const +</h3> + +<p> This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> Transforms <em>p</em> to using the formulae: +<p> <pre> + retx = m11*px + m21*py + dx (rounded to the nearest integer) + rety = m22*py + m12*px + dy (rounded to the nearest integer) + </pre> + + +<h3 class=fn><a href="qrect.html">QRect</a> <a name="map-4"></a>QWMatrix::map ( const <a href="qrect.html">QRect</a> & r ) const +</h3> + +<p> <b>This function is obsolete.</b> It is provided to keep old source working. We strongly advise against using it in new code. +<p> Please use <a href="#mapRect">QWMatrix::mapRect</a>() instead. +<p> Note that this method does return the bounding rectangle of the <em>r</em>, when +shearing or rotations are used. + +<h3 class=fn><a href="qpointarray.html">QPointArray</a> <a name="map-5"></a>QWMatrix::map ( const <a href="qpointarray.html">QPointArray</a> & a ) const +</h3> + +<p> This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> Returns the point array <em>a</em> transformed by calling map for each point. + +<h3 class=fn><a href="qregion.html">QRegion</a> <a name="map-6"></a>QWMatrix::map ( const <a href="qregion.html">QRegion</a> & r ) const +</h3> + +<p> This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> Transforms the region <em>r</em>. +<p> Calling this method can be rather expensive, if rotations or +shearing are used. + +<h3 class=fn><a href="qrect.html">QRect</a> <a name="mapRect"></a>QWMatrix::mapRect ( const <a href="qrect.html">QRect</a> & rect ) const +</h3> +Returns the transformed rectangle <em>rect</em>. +<p> The bounding rectangle is returned if rotation or shearing has +been specified. +<p> If you need to know the exact region <em>rect</em> maps to use <a href="qsize.html#operator*-4">operator*</a>(). +<p> <p>See also <a href="qsize.html#operator*-4">operator*</a>(). + +<p>Example: <a href="xform-example.html#x1279">xform/xform.cpp</a>. +<h3 class=fn><a href="qpointarray.html">QPointArray</a> <a name="mapToPolygon"></a>QWMatrix::mapToPolygon ( const <a href="qrect.html">QRect</a> & rect ) const +</h3> +Returns the transformed rectangle <em>rect</em> as a polygon. +<p> Polygons and rectangles behave slightly differently +when transformed (due to integer rounding), so +<tt>matrix.map( QPointArray( rect ) )</tt> is not always the same as +<tt>matrix.mapToPolygon( rect )</tt>. + +<h3 class=fn><a href="qregion.html">QRegion</a> <a name="mapToRegion"></a>QWMatrix::mapToRegion ( const <a href="qrect.html">QRect</a> & rect ) const +</h3> + +<p> Returns the transformed rectangle <em>rect</em>. +<p> A rectangle which has been rotated or sheared may result in a +non-rectangular region being returned. +<p> Calling this method can be expensive, if rotations or shearing are +used. If you just need to know the bounding rectangle of the +returned region, use <a href="#mapRect">mapRect</a>() which is a lot faster than this +function. +<p> <p>See also <a href="#mapRect">QWMatrix::mapRect</a>(). + +<h3 class=fn>bool <a name="operator!-eq"></a>QWMatrix::operator!= ( const <a href="qwmatrix.html">QWMatrix</a> & m ) const +</h3> +Returns TRUE if this matrix is not equal to <em>m</em>; otherwise returns FALSE. + +<h3 class=fn><a href="qwmatrix.html">QWMatrix</a> & <a name="operator*-eq"></a>QWMatrix::operator*= ( const <a href="qwmatrix.html">QWMatrix</a> & m ) +</h3> +Returns the result of multiplying this matrix by matrix <em>m</em>. + +<h3 class=fn>bool <a name="operator-eq-eq"></a>QWMatrix::operator== ( const <a href="qwmatrix.html">QWMatrix</a> & m ) const +</h3> +Returns TRUE if this matrix is equal to <em>m</em>; otherwise returns FALSE. + +<h3 class=fn>void <a name="reset"></a>QWMatrix::reset () +</h3> +Resets the matrix to an identity matrix. +<p> All elements are set to zero, except <em>m11</em> and <em>m22</em> (scaling) +which are set to 1. +<p> <p>See also <a href="#isIdentity">isIdentity</a>(). + +<h3 class=fn><a href="qwmatrix.html">QWMatrix</a> & <a name="rotate"></a>QWMatrix::rotate ( double a ) +</h3> +Rotates the coordinate system <em>a</em> degrees counterclockwise. +<p> Returns a reference to the matrix. +<p> <p>See also <a href="#translate">translate</a>(), <a href="#scale">scale</a>(), and <a href="#shear">shear</a>(). + +<p>Examples: <a href="canvas-example.html#x2955">canvas/canvas.cpp</a>, <a href="desktop-example.html#x1764">desktop/desktop.cpp</a>, <a href="drawdemo-example.html#x1095">drawdemo/drawdemo.cpp</a>, <a href="tutorial1-14.html#x2435">t14/cannon.cpp</a>, and <a href="xform-example.html#x1280">xform/xform.cpp</a>. +<h3 class=fn><a href="qwmatrix.html">QWMatrix</a> & <a name="scale"></a>QWMatrix::scale ( double sx, double sy ) +</h3> +Scales the coordinate system unit by <em>sx</em> horizontally and <em>sy</em> +vertically. +<p> Returns a reference to the matrix. +<p> <p>See also <a href="#translate">translate</a>(), <a href="#shear">shear</a>(), and <a href="#rotate">rotate</a>(). + +<p>Examples: <a href="canvas-example.html#x2956">canvas/canvas.cpp</a>, <a href="fileiconview-example.html#x876">fileiconview/qfileiconview.cpp</a>, <a href="movies-example.html#x524">movies/main.cpp</a>, <a href="qmag-example.html#x1809">qmag/qmag.cpp</a>, <a href="showimg-example.html#x1357">showimg/showimg.cpp</a>, and <a href="xform-example.html#x1281">xform/xform.cpp</a>. +<h3 class=fn>void <a name="setMatrix"></a>QWMatrix::setMatrix ( double m11, double m12, double m21, double m22, double dx, double dy ) +</h3> +Sets the matrix elements to the specified values, <em>m11</em>, <em>m12</em>, +<em>m21</em>, <em>m22</em>, <em>dx</em> and <em>dy</em>. + +<h3 class=fn>void <a name="setTransformationMode"></a>QWMatrix::setTransformationMode ( <a href="qwmatrix.html#TransformationMode-enum">QWMatrix::TransformationMode</a> m )<tt> [static]</tt> +</h3> +Sets the transformation mode that QWMatrix and painter +transformations use to <em>m</em>. +<p> <p>See also <a href="#TransformationMode-enum">QWMatrix::TransformationMode</a>. + +<h3 class=fn><a href="qwmatrix.html">QWMatrix</a> & <a name="shear"></a>QWMatrix::shear ( double sh, double sv ) +</h3> +Shears the coordinate system by <em>sh</em> horizontally and <em>sv</em> +vertically. +<p> Returns a reference to the matrix. +<p> <p>See also <a href="#translate">translate</a>(), <a href="#scale">scale</a>(), and <a href="#rotate">rotate</a>(). + +<p>Examples: <a href="drawdemo-example.html#x1096">drawdemo/drawdemo.cpp</a> and <a href="xform-example.html#x1282">xform/xform.cpp</a>. +<h3 class=fn><a href="qwmatrix.html#TransformationMode-enum">TransformationMode</a> <a name="transformationMode"></a>QWMatrix::transformationMode ()<tt> [static]</tt> +</h3> +Returns the current transformation mode. +<p> <p>See also <a href="#TransformationMode-enum">QWMatrix::TransformationMode</a>. + +<h3 class=fn><a href="qwmatrix.html">QWMatrix</a> & <a name="translate"></a>QWMatrix::translate ( double dx, double dy ) +</h3> +Moves the coordinate system <em>dx</em> along the X-axis and <em>dy</em> along +the Y-axis. +<p> Returns a reference to the matrix. +<p> <p>See also <a href="#scale">scale</a>(), <a href="#shear">shear</a>(), and <a href="#rotate">rotate</a>(). + +<p>Examples: <a href="canvas-example.html#x2957">canvas/canvas.cpp</a>, <a href="drawdemo-example.html#x1097">drawdemo/drawdemo.cpp</a>, <a href="tutorial1-14.html#x2436">t14/cannon.cpp</a>, and <a href="xform-example.html#x1283">xform/xform.cpp</a>. +<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="qwmatrix.html">QWMatrix</a> & m ) +</h3> + +<p> Writes the matrix <em>m</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="qwmatrix.html">QWMatrix</a> & m ) +</h3> + +<p> Reads the matrix <em>m</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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