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<li class="level1"><a href="#public-functions">Public Functions</a></li>
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<h1 class="title">Q3CanvasView Class Reference</h1>
<!-- $$$Q3CanvasView-brief -->
<p>The Q3CanvasView class provides an on-screen view of a <a href="q3canvas.html">Q3Canvas</a>. <a href="#details">More...</a></p>
<!-- @@@Q3CanvasView -->
<pre class="cpp"> <span class="preprocessor">#include <Q3CanvasView></span></pre><p><b>This class is part of the Qt 3 support library.</b> It is provided to keep old source code working. We strongly advise against using it in new code. See <a href="porting4.html">Porting to Qt 4</a> for more information.</p>
<p><b>Inherits: </b><a href="q3scrollview.html">Q3ScrollView</a>.</p>
<ul>
<li><a href="q3canvasview-members.html">List of all members, including inherited members</a></li>
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<a name="public-functions"></a>
<h2>Public Functions</h2>
<table class="alignedsummary">
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="q3canvasview.html#Q3CanvasView">Q3CanvasView</a></b> ( QWidget * <i>parent</i> = 0, const char * <i>name</i> = 0, Qt::WindowFlags <i>f</i> = 0 )</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="q3canvasview.html#Q3CanvasView-2">Q3CanvasView</a></b> ( Q3Canvas * <i>canvas</i>, QWidget * <i>parent</i> = 0, const char * <i>name</i> = 0, Qt::WindowFlags <i>f</i> = 0 )</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="q3canvasview.html#dtor.Q3CanvasView">~Q3CanvasView</a></b> ()</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> Q3Canvas * </td><td class="memItemRight bottomAlign"><b><a href="q3canvasview.html#canvas">canvas</a></b> () const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> const QMatrix & </td><td class="memItemRight bottomAlign"><b><a href="q3canvasview.html#inverseWorldMatrix">inverseWorldMatrix</a></b> () const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="q3canvasview.html#setCanvas">setCanvas</a></b> ( Q3Canvas * <i>canvas</i> )</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> bool </td><td class="memItemRight bottomAlign"><b><a href="q3canvasview.html#setWorldMatrix">setWorldMatrix</a></b> ( const QMatrix & <i>wm</i> )</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> const QMatrix & </td><td class="memItemRight bottomAlign"><b><a href="q3canvasview.html#worldMatrix">worldMatrix</a></b> () const</td></tr>
</table>
<ul>
<li class="fn">49 public functions inherited from <a href="q3scrollview.html#public-functions">Q3ScrollView</a></li>
<li class="fn">4 public functions inherited from <a href="q3frame.html#public-functions">Q3Frame</a></li>
<li class="fn">14 public functions inherited from <a href="qframe.html#public-functions">QFrame</a></li>
<li class="fn">221 public functions inherited from <a href="qwidget.html#public-functions">QWidget</a></li>
<li class="fn">29 public functions inherited from <a href="qobject.html#public-functions">QObject</a></li>
<li class="fn">13 public functions inherited from <a href="qpaintdevice.html#public-functions">QPaintDevice</a></li>
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<a name="reimplemented-protected-functions"></a>
<h2>Reimplemented Protected Functions</h2>
<table class="alignedsummary">
<tr><td class="memItemLeft rightAlign topAlign"> virtual void </td><td class="memItemRight bottomAlign"><b><a href="q3canvasview.html#drawContents">drawContents</a></b> ( QPainter * <i>p</i>, int <i>cx</i>, int <i>cy</i>, int <i>cw</i>, int <i>ch</i> )</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> virtual QSize </td><td class="memItemRight bottomAlign"><b><a href="q3canvasview.html#sizeHint">sizeHint</a></b> () const</td></tr>
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<ul>
<li class="fn">26 protected functions inherited from <a href="q3scrollview.html#protected-functions">Q3ScrollView</a></li>
<li class="fn">5 protected functions inherited from <a href="q3frame.html#protected-functions">Q3Frame</a></li>
<li class="fn">3 protected functions inherited from <a href="qframe.html#protected-functions">QFrame</a></li>
<li class="fn">37 protected functions inherited from <a href="qwidget.html#protected-functions">QWidget</a></li>
<li class="fn">8 protected functions inherited from <a href="qobject.html#protected-functions">QObject</a></li>
<li class="fn">1 protected function inherited from <a href="qpaintdevice.html#protected-functions">QPaintDevice</a></li>
</ul>
<h3>Additional Inherited Members</h3>
<ul>
<li class="fn">10 properties inherited from <a href="q3scrollview.html#properties">Q3ScrollView</a></li>
<li class="fn">2 properties inherited from <a href="q3frame.html#properties">Q3Frame</a></li>
<li class="fn">6 properties inherited from <a href="qframe.html#properties">QFrame</a></li>
<li class="fn">58 properties inherited from <a href="qwidget.html#properties">QWidget</a></li>
<li class="fn">1 property inherited from <a href="qobject.html#properties">QObject</a></li>
<li class="fn">8 public slots inherited from <a href="q3scrollview.html#public-slots">Q3ScrollView</a></li>
<li class="fn">19 public slots inherited from <a href="qwidget.html#public-slots">QWidget</a></li>
<li class="fn">1 public slot inherited from <a href="qobject.html#public-slots">QObject</a></li>
<li class="fn">5 signals inherited from <a href="q3scrollview.html#signals">Q3ScrollView</a></li>
<li class="fn">1 signal inherited from <a href="qwidget.html#signals">QWidget</a></li>
<li class="fn">1 signal inherited from <a href="qobject.html#signals">QObject</a></li>
<li class="fn">4 static public members inherited from <a href="qwidget.html#static-public-members">QWidget</a></li>
<li class="fn">7 static public members inherited from <a href="qobject.html#static-public-members">QObject</a></li>
<li class="fn">26 protected functions inherited from <a href="q3scrollview.html#protected-functions">Q3ScrollView</a></li>
<li class="fn">5 protected functions inherited from <a href="q3frame.html#protected-functions">Q3Frame</a></li>
<li class="fn">3 protected functions inherited from <a href="qframe.html#protected-functions">QFrame</a></li>
<li class="fn">37 protected functions inherited from <a href="qwidget.html#protected-functions">QWidget</a></li>
<li class="fn">8 protected functions inherited from <a href="qobject.html#protected-functions">QObject</a></li>
<li class="fn">1 protected function inherited from <a href="qpaintdevice.html#protected-functions">QPaintDevice</a></li>
<li class="fn">1 protected slot inherited from <a href="qwidget.html#protected-slots">QWidget</a></li>
</ul>
<a name="details"></a>
<!-- $$$Q3CanvasView-description -->
<div class="descr">
<h2>Detailed Description</h2>
<p>The Q3CanvasView class provides an on-screen view of a <a href="q3canvas.html">Q3Canvas</a>.</p>
<p>A Q3CanvasView is widget which provides a view of a <a href="q3canvas.html">Q3Canvas</a>.</p>
<p>If you want users to be able to interact with a canvas view, subclass Q3CanvasView. You might then reimplement <a href="q3scrollview.html#contentsMousePressEvent">Q3ScrollView::contentsMousePressEvent</a>(). For example:</p>
<pre class="cpp"> <span class="type">void</span> MyCanvasView<span class="operator">::</span><a href="q3scrollview.html#contentsMousePressEvent">contentsMousePressEvent</a>(<span class="type"><a href="qmouseevent.html">QMouseEvent</a></span><span class="operator">*</span> e)
{
<span class="type"><a href="q3canvasitemlist.html">Q3CanvasItemList</a></span> l <span class="operator">=</span> canvas()<span class="operator">-</span><span class="operator">></span>collisions(e<span class="operator">-</span><span class="operator">></span>pos());
<span class="keyword">for</span> (<span class="type"><a href="q3canvasitemlist.html">Q3CanvasItemList</a></span><span class="operator">::</span>Iterator it<span class="operator">=</span>l<span class="operator">.</span>begin(); it<span class="operator">!</span><span class="operator">=</span>l<span class="operator">.</span>end(); <span class="operator">+</span><span class="operator">+</span>it) {
<span class="keyword">if</span> ((<span class="operator">*</span>it)<span class="operator">-</span><span class="operator">></span>rtti() <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="q3canvasrectangle.html">Q3CanvasRectangle</a></span><span class="operator">::</span>RTTI)
<a href="qtglobal.html#qDebug">qDebug</a>(<span class="string">"A Q3CanvasRectangle lies somewhere at this point"</span>);
}
}</pre>
<p>The canvas view shows canvas <a href="q3canvasview.html#canvas">canvas</a>(); this can be changed using <a href="q3canvasview.html#setCanvas">setCanvas</a>().</p>
<p>A transformation matrix can be used to transform the view of the canvas in various ways, for example, zooming in or out or rotating. For example:</p>
<pre class="cpp"> <span class="type"><a href="qmatrix.html">QMatrix</a></span> wm;
wm<span class="operator">.</span>scale(<span class="number">2</span><span class="operator">,</span> <span class="number">2</span>); <span class="comment">// Zooms in by 2 times</span>
wm<span class="operator">.</span>rotate(<span class="number">90</span>); <span class="comment">// Rotates 90 degrees counter clockwise</span>
<span class="comment">// around the origin.</span>
wm<span class="operator">.</span>translate(<span class="number">0</span><span class="operator">,</span> <span class="operator">-</span>canvas<span class="operator">-</span><span class="operator">></span>height());
<span class="comment">// moves the canvas down so what was visible</span>
<span class="comment">// before is still visible.</span>
myCanvasView<span class="operator">-</span><span class="operator">></span><a href="q3canvasview.html#setWorldMatrix">setWorldMatrix</a>(wm);</pre>
<p>Use <a href="q3canvasview.html#setWorldMatrix">setWorldMatrix</a>() to set the canvas view's world matrix: you must ensure that the world matrix is invertible. The current world matrix is retrievable with <a href="q3canvasview.html#worldMatrix">worldMatrix</a>(), and its inversion is retrievable with <a href="q3canvasview.html#inverseWorldMatrix">inverseWorldMatrix</a>().</p>
<p>Example:</p>
<p>The following code finds the part of the canvas that is visible in this view, i.e. the bounding rectangle of the view in canvas coordinates.</p>
<pre class="cpp"> <span class="type"><a href="qrect.html">QRect</a></span> rc <span class="operator">=</span> <span class="type"><a href="qrect.html">QRect</a></span>(myCanvasView<span class="operator">-</span><span class="operator">></span>contentsX()<span class="operator">,</span> myCanvasView<span class="operator">-</span><span class="operator">></span>contentsY()<span class="operator">,</span>
myCanvasView<span class="operator">-</span><span class="operator">></span>visibleWidth()<span class="operator">,</span> myCanvasView<span class="operator">-</span><span class="operator">></span>visibleHeight());
<span class="type"><a href="qrect.html">QRect</a></span> canvasRect <span class="operator">=</span> myCanvasView<span class="operator">-</span><span class="operator">></span><a href="q3canvasview.html#inverseWorldMatrix">inverseWorldMatrix</a>()<span class="operator">.</span>mapRect(rc);</pre>
</div>
<p><b>See also </b><a href="qmatrix.html" class="obsolete">QMatrix</a>, <a href="qpainter-obsolete.html#setWorldMatrix" class="obsolete">QPainter::setWorldMatrix</a>(), <a href="http://www.qt.io/product/">QtCanvas</a>, and <a href="graphicsview-porting.html">Porting to Graphics View</a>.</p>
<!-- @@@Q3CanvasView -->
<div class="func">
<h2>Member Function Documentation</h2>
<!-- $$$Q3CanvasView[overload1]$$$Q3CanvasViewQWidget*constchar*Qt::WindowFlags -->
<h3 class="fn"><a name="Q3CanvasView"></a>Q3CanvasView::<span class="name">Q3CanvasView</span> ( <span class="type"><a href="qwidget.html">QWidget</a></span> * <i>parent</i> = 0, const <span class="type">char</span> * <i>name</i> = 0, <span class="type"><a href="qt.html#WindowType-enum">Qt::WindowFlags</a></span> <i>f</i> = 0 )</h3>
<p>Constructs a <a href="q3canvasview.html" class="compat">Q3CanvasView</a> with parent <i>parent</i>, and name <i>name</i>, using the widget flags <i>f</i>. The canvas view is not associated with a canvas, so you must to call <a href="q3canvasview.html#setCanvas">setCanvas</a>() to view a canvas.</p>
<!-- @@@Q3CanvasView -->
<!-- $$$Q3CanvasView$$$Q3CanvasViewQ3Canvas*QWidget*constchar*Qt::WindowFlags -->
<h3 class="fn"><a name="Q3CanvasView-2"></a>Q3CanvasView::<span class="name">Q3CanvasView</span> ( <span class="type"><a href="q3canvas.html">Q3Canvas</a></span> * <i>canvas</i>, <span class="type"><a href="qwidget.html">QWidget</a></span> * <i>parent</i> = 0, const <span class="type">char</span> * <i>name</i> = 0, <span class="type"><a href="qt.html#WindowType-enum">Qt::WindowFlags</a></span> <i>f</i> = 0 )</h3>
<p>This is an overloaded function.</p>
<p>Constructs a <a href="q3canvasview.html" class="compat">Q3CanvasView</a> which views canvas <i>canvas</i>, with parent <i>parent</i>, and name <i>name</i>, using the widget flags <i>f</i>.</p>
<!-- @@@Q3CanvasView -->
<!-- $$$~Q3CanvasView[overload1]$$$~Q3CanvasView -->
<h3 class="fn"><a name="dtor.Q3CanvasView"></a>Q3CanvasView::<span class="name">~Q3CanvasView</span> ()</h3>
<p>Destroys the canvas view. The associated canvas is <i>not</i> deleted.</p>
<!-- @@@~Q3CanvasView -->
<!-- $$$canvas[overload1]$$$canvas -->
<h3 class="fn"><a name="canvas"></a><span class="type"><a href="q3canvas.html">Q3Canvas</a></span> * Q3CanvasView::<span class="name">canvas</span> () const</h3>
<p>Returns a pointer to the canvas which the <a href="q3canvasview.html" class="compat">Q3CanvasView</a> is currently showing.</p>
<p><b>See also </b><a href="q3canvasview.html#setCanvas">setCanvas</a>().</p>
<!-- @@@canvas -->
<!-- $$$drawContents[overload1]$$$drawContentsQPainter*intintintint -->
<h3 class="fn"><a name="drawContents"></a><span class="type">void</span> Q3CanvasView::<span class="name">drawContents</span> ( <span class="type"><a href="qpainter.html">QPainter</a></span> * <i>p</i>, <span class="type">int</span> <i>cx</i>, <span class="type">int</span> <i>cy</i>, <span class="type">int</span> <i>cw</i>, <span class="type">int</span> <i>ch</i> )<tt> [virtual protected]</tt></h3>
<p>Reimplemented from <a href="q3scrollview.html#drawContents">Q3ScrollView::drawContents</a>().</p>
<p>Repaints part of the <a href="q3canvas.html" class="compat">Q3Canvas</a> that the canvas view is showing starting at <i>cx</i> by <i>cy</i>, with a width of <i>cw</i> and a height of <i>ch</i> using the painter <i>p</i>.</p>
<!-- @@@drawContents -->
<!-- $$$inverseWorldMatrix[overload1]$$$inverseWorldMatrix -->
<h3 class="fn"><a name="inverseWorldMatrix"></a>const <span class="type"><a href="qmatrix.html">QMatrix</a></span> & Q3CanvasView::<span class="name">inverseWorldMatrix</span> () const</h3>
<p>Returns a reference to the inverse of the canvas view's current transformation matrix.</p>
<p><b>See also </b><a href="q3canvasview.html#setWorldMatrix">setWorldMatrix</a>() and <a href="q3canvasview.html#worldMatrix">worldMatrix</a>().</p>
<!-- @@@inverseWorldMatrix -->
<!-- $$$setCanvas[overload1]$$$setCanvasQ3Canvas* -->
<h3 class="fn"><a name="setCanvas"></a><span class="type">void</span> Q3CanvasView::<span class="name">setCanvas</span> ( <span class="type"><a href="q3canvas.html">Q3Canvas</a></span> * <i>canvas</i> )</h3>
<p>Sets the canvas that the <a href="q3canvasview.html" class="compat">Q3CanvasView</a> is showing to the canvas <i>canvas</i>.</p>
<p><b>See also </b><a href="q3canvasview.html#canvas">canvas</a>().</p>
<!-- @@@setCanvas -->
<!-- $$$setWorldMatrix[overload1]$$$setWorldMatrixconstQMatrix& -->
<h3 class="fn"><a name="setWorldMatrix"></a><span class="type">bool</span> Q3CanvasView::<span class="name">setWorldMatrix</span> ( const <span class="type"><a href="qmatrix.html">QMatrix</a></span> & <i>wm</i> )</h3>
<p>Sets the transformation matrix of the <a href="q3canvasview.html" class="compat">Q3CanvasView</a> to <i>wm</i>. The matrix must be invertible (i.e. if you create a world matrix that zooms out by 2 times, then the inverse of this matrix is one that will zoom in by 2 times).</p>
<p>When you use this, you should note that the performance of the <a href="q3canvasview.html" class="compat">Q3CanvasView</a> will decrease considerably.</p>
<p>Returns false if <i>wm</i> is not invertable; otherwise returns true.</p>
<p><b>See also </b><a href="q3canvasview.html#worldMatrix">worldMatrix</a>(), <a href="q3canvasview.html#inverseWorldMatrix">inverseWorldMatrix</a>(), and <a href="qmatrix.html#isInvertible">QMatrix::isInvertible</a>().</p>
<!-- @@@setWorldMatrix -->
<!-- $$$sizeHint[overload1]$$$sizeHint -->
<h3 class="fn"><a name="sizeHint"></a><span class="type"><a href="qsize.html">QSize</a></span> Q3CanvasView::<span class="name">sizeHint</span> () const<tt> [virtual protected]</tt></h3>
<p>Reimplemented from <a href="qwidget.html#sizeHint-prop">QWidget::sizeHint</a>().</p>
<p>Suggests a size sufficient to view the entire canvas.</p>
<!-- @@@sizeHint -->
<!-- $$$worldMatrix[overload1]$$$worldMatrix -->
<h3 class="fn"><a name="worldMatrix"></a>const <span class="type"><a href="qmatrix.html">QMatrix</a></span> & Q3CanvasView::<span class="name">worldMatrix</span> () const</h3>
<p>Returns a reference to the canvas view's current transformation matrix.</p>
<p><b>See also </b><a href="q3canvasview.html#setWorldMatrix">setWorldMatrix</a>() and <a href="q3canvasview.html#inverseWorldMatrix">inverseWorldMatrix</a>().</p>
<!-- @@@worldMatrix -->
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