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<li class="level1"><a href="#public-functions">Public Functions</a></li>
<li class="level1"><a href="#protected-functions">Protected Functions</a></li>
<li class="level1"><a href="#details">Detailed Description</a></li>
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<h1 class="title">Q3CanvasPolygonalItem Class Reference</h1>
<!-- $$$Q3CanvasPolygonalItem-brief -->
<p>The Q3CanvasPolygonalItem class provides a polygonal canvas item on a <a href="q3canvas.html">Q3Canvas</a>. <a href="#details">More...</a></p>
<!-- @@@Q3CanvasPolygonalItem -->
<pre class="cpp"> <span class="preprocessor">#include <Q3CanvasPolygonalItem></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="q3canvasitem.html">Q3CanvasItem</a>.</p>
<p><b>Inherited by: </b><a href="q3canvasellipse.html">Q3CanvasEllipse</a>, <a href="q3canvasline.html">Q3CanvasLine</a>, <a href="q3canvaspolygon.html">Q3CanvasPolygon</a>, and <a href="q3canvasrectangle.html">Q3CanvasRectangle</a>.</p>
<ul>
<li><a href="q3canvaspolygonalitem-members.html">List of all members, including inherited members</a></li>
</ul>
<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="q3canvaspolygonalitem.html#Q3CanvasPolygonalItem">Q3CanvasPolygonalItem</a></b> ( Q3Canvas * <i>canvas</i> )</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> virtual </td><td class="memItemRight bottomAlign"><b><a href="q3canvaspolygonalitem.html#dtor.Q3CanvasPolygonalItem">~Q3CanvasPolygonalItem</a></b> ()</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> virtual Q3PointArray </td><td class="memItemRight bottomAlign"><b><a href="q3canvaspolygonalitem.html#areaPoints">areaPoints</a></b> () const = 0</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> virtual Q3PointArray </td><td class="memItemRight bottomAlign"><b><a href="q3canvaspolygonalitem.html#areaPointsAdvanced">areaPointsAdvanced</a></b> () const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QBrush </td><td class="memItemRight bottomAlign"><b><a href="q3canvaspolygonalitem.html#brush">brush</a></b> () const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QPen </td><td class="memItemRight bottomAlign"><b><a href="q3canvaspolygonalitem.html#pen">pen</a></b> () const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> virtual void </td><td class="memItemRight bottomAlign"><b><a href="q3canvaspolygonalitem.html#setBrush">setBrush</a></b> ( QBrush <i>b</i> )</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> virtual void </td><td class="memItemRight bottomAlign"><b><a href="q3canvaspolygonalitem.html#setPen">setPen</a></b> ( QPen <i>p</i> )</td></tr>
</table>
<a name="reimplemented-public-functions"></a>
<h2>Reimplemented Public Functions</h2>
<table class="alignedsummary">
<tr><td class="memItemLeft rightAlign topAlign"> virtual QRect </td><td class="memItemRight bottomAlign"><b><a href="q3canvaspolygonalitem.html#boundingRect">boundingRect</a></b> () const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> virtual bool </td><td class="memItemRight bottomAlign"><b><a href="q3canvaspolygonalitem.html#collidesWith">collidesWith</a></b> ( const Q3CanvasItem * <i>i</i> ) const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> virtual int </td><td class="memItemRight bottomAlign"><b><a href="q3canvaspolygonalitem.html#rtti">rtti</a></b> () const</td></tr>
</table>
<ul>
<li class="fn">34 public functions inherited from <a href="q3canvasitem.html#public-functions">Q3CanvasItem</a></li>
</ul>
<a name="protected-functions"></a>
<h2>Protected Functions</h2>
<table class="alignedsummary">
<tr><td class="memItemLeft rightAlign topAlign"> virtual void </td><td class="memItemRight bottomAlign"><b><a href="q3canvaspolygonalitem.html#drawShape">drawShape</a></b> ( QPainter & <i>p</i> ) = 0</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="q3canvaspolygonalitem.html#invalidate">invalidate</a></b> ()</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> bool </td><td class="memItemRight bottomAlign"><b><a href="q3canvaspolygonalitem.html#isValid">isValid</a></b> () const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="q3canvaspolygonalitem.html#setWinding">setWinding</a></b> ( bool <i>enable</i> )</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> bool </td><td class="memItemRight bottomAlign"><b><a href="q3canvaspolygonalitem.html#winding">winding</a></b> () const</td></tr>
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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="q3canvaspolygonalitem.html#draw">draw</a></b> ( QPainter & <i>p</i> )</td></tr>
</table>
<ul>
<li class="fn">1 protected function inherited from <a href="q3canvasitem.html#protected-functions">Q3CanvasItem</a></li>
</ul>
<a name="details"></a>
<!-- $$$Q3CanvasPolygonalItem-description -->
<div class="descr">
<h2>Detailed Description</h2>
<p>The Q3CanvasPolygonalItem class provides a polygonal canvas item on a <a href="q3canvas.html">Q3Canvas</a>.</p>
<p>The mostly rectangular classes, such as <a href="q3canvassprite.html">Q3CanvasSprite</a> and <a href="q3canvastext.html">Q3CanvasText</a>, use the object's bounding rectangle for movement, repainting and collision calculations. For most other items, the bounding rectangle can be far too large -- a diagonal line being the worst case, and there are many other cases which are also bad. Q3CanvasPolygonalItem provides polygon-based bounding rectangle handling, etc., which is much faster for non-rectangular items.</p>
<p>Derived classes should try to define as small an area as possible to maximize efficiency, but the polygon must <i>definitely</i> be contained completely within the polygonal area. Calculating the exact requirements is usually difficult, but if you allow a small overestimate it can be easy and quick, while still getting almost all of Q3CanvasPolygonalItem's speed.</p>
<p>Note that all subclasses <i>must</i> call <a href="q3canvasitem.html#hide">hide</a>() in their destructor since <a href="q3canvasitem.html#hide">hide</a>() needs to be able to access <a href="q3canvaspolygonalitem.html#areaPoints">areaPoints</a>().</p>
<p>Normally, Q3CanvasPolygonalItem uses the odd-even algorithm for determining whether an object intersects this object. You can change this to the winding algorithm using <a href="q3canvaspolygonalitem.html#setWinding">setWinding</a>().</p>
<p>The bounding rectangle is available using <a href="q3canvaspolygonalitem.html#boundingRect">boundingRect</a>(). The points bounding the polygonal item are retrieved with <a href="q3canvaspolygonalitem.html#areaPoints">areaPoints</a>(). Use <a href="q3canvaspolygonalitem.html#areaPointsAdvanced">areaPointsAdvanced</a>() to retrieve the bounding points the polygonal item <i>will</i> have after Q3CanvasItem::advance(1) has been called.</p>
<p>If the shape of the polygonal item is about to change while the item is visible, call <a href="q3canvaspolygonalitem.html#invalidate">invalidate</a>() before updating with a different result from <a href="q3canvaspolygonalitem.html#areaPoints">areaPoints</a>().</p>
<p>By default, Q3CanvasPolygonalItem objects have a black pen and no brush (the default <a href="qpen.html">QPen</a> and <a href="qbrush.html">QBrush</a> constructors). You can change this with <a href="q3canvaspolygonalitem.html#setPen">setPen</a>() and <a href="q3canvaspolygonalitem.html#setBrush">setBrush</a>(), but note that some Q3CanvasPolygonalItem subclasses only use the brush, ignoring the pen setting.</p>
<p>The polygonal item can be drawn on a painter with <a href="q3canvaspolygonalitem.html#draw">draw</a>(). Subclasses must reimplement <a href="q3canvaspolygonalitem.html#drawShape">drawShape</a>() to draw themselves.</p>
<p>Like any other canvas item polygonal items can be moved with <a href="q3canvasitem.html#move">Q3CanvasItem::move</a>() and <a href="q3canvasitem.html#moveBy">Q3CanvasItem::moveBy</a>(), or by setting coordinates with <a href="q3canvasitem.html#setX">Q3CanvasItem::setX</a>(), <a href="q3canvasitem.html#setY">Q3CanvasItem::setY</a>() and <a href="q3canvasitem.html#setZ">Q3CanvasItem::setZ</a>().</p>
</div>
<p><b>See also </b><a href="http://qt.digia.com/product/">QtCanvas</a> and <a href="graphicsview-porting.html">Porting to Graphics View</a>.</p>
<!-- @@@Q3CanvasPolygonalItem -->
<div class="func">
<h2>Member Function Documentation</h2>
<!-- $$$Q3CanvasPolygonalItem[overload1]$$$Q3CanvasPolygonalItemQ3Canvas* -->
<h3 class="fn"><a name="Q3CanvasPolygonalItem"></a>Q3CanvasPolygonalItem::<span class="name">Q3CanvasPolygonalItem</span> ( <span class="type"><a href="q3canvas.html">Q3Canvas</a></span> * <i>canvas</i> )</h3>
<p>Constructs a <a href="q3canvaspolygonalitem.html" class="compat">Q3CanvasPolygonalItem</a> on the canvas <i>canvas</i>.</p>
<!-- @@@Q3CanvasPolygonalItem -->
<!-- $$$~Q3CanvasPolygonalItem[overload1]$$$~Q3CanvasPolygonalItem -->
<h3 class="fn"><a name="dtor.Q3CanvasPolygonalItem"></a>Q3CanvasPolygonalItem::<span class="name">~Q3CanvasPolygonalItem</span> ()<tt> [virtual]</tt></h3>
<p>Note that all subclasses <i>must</i> call <a href="q3canvasitem.html#hide">hide</a>() in their destructor since <a href="q3canvasitem.html#hide">hide</a>() needs to be able to access <a href="q3canvaspolygonalitem.html#areaPoints">areaPoints</a>().</p>
<!-- @@@~Q3CanvasPolygonalItem -->
<!-- $$$areaPoints[overload1]$$$areaPoints -->
<h3 class="fn"><a name="areaPoints"></a><span class="type"><a href="q3pointarray.html">Q3PointArray</a></span> Q3CanvasPolygonalItem::<span class="name">areaPoints</span> () const<tt> [pure virtual]</tt></h3>
<p>This function must be reimplemented by subclasses. It <i>must</i> return the points bounding (i.e. outside and not touching) the shape or drawing errors will occur.</p>
<!-- @@@areaPoints -->
<!-- $$$areaPointsAdvanced[overload1]$$$areaPointsAdvanced -->
<h3 class="fn"><a name="areaPointsAdvanced"></a><span class="type"><a href="q3pointarray.html">Q3PointArray</a></span> Q3CanvasPolygonalItem::<span class="name">areaPointsAdvanced</span> () const<tt> [virtual]</tt></h3>
<p>Returns the points the polygonal item <i>will</i> have after Q3CanvasItem::advance(1) is called, i.e. what the points are when advanced by the current <a href="q3canvasitem.html#xVelocity">xVelocity</a>() and <a href="q3canvasitem.html#yVelocity">yVelocity</a>().</p>
<!-- @@@areaPointsAdvanced -->
<!-- $$$boundingRect[overload1]$$$boundingRect -->
<h3 class="fn"><a name="boundingRect"></a><span class="type"><a href="qrect.html">QRect</a></span> Q3CanvasPolygonalItem::<span class="name">boundingRect</span> () const<tt> [virtual]</tt></h3>
<p>Reimplemented from <a href="q3canvasitem.html#boundingRect">Q3CanvasItem::boundingRect</a>().</p>
<p>Returns the bounding rectangle of the polygonal item, based on <a href="q3canvaspolygonalitem.html#areaPoints">areaPoints</a>().</p>
<!-- @@@boundingRect -->
<!-- $$$brush[overload1]$$$brush -->
<h3 class="fn"><a name="brush"></a><span class="type"><a href="qbrush.html">QBrush</a></span> Q3CanvasPolygonalItem::<span class="name">brush</span> () const</h3>
<p>Returns the <a href="qbrush.html">QBrush</a> used to fill the item, if filled.</p>
<p><b>See also </b><a href="q3canvaspolygonalitem.html#setBrush">setBrush</a>().</p>
<!-- @@@brush -->
<!-- $$$collidesWith[overload1]$$$collidesWithconstQ3CanvasItem* -->
<h3 class="fn"><a name="collidesWith"></a><span class="type">bool</span> Q3CanvasPolygonalItem::<span class="name">collidesWith</span> ( const <span class="type"><a href="q3canvasitem.html">Q3CanvasItem</a></span> * <i>i</i> ) const<tt> [virtual]</tt></h3>
<p>Reimplemented from <a href="q3canvasitem.html#collidesWith">Q3CanvasItem::collidesWith</a>().</p>
<!-- @@@collidesWith -->
<!-- $$$draw[overload1]$$$drawQPainter& -->
<h3 class="fn"><a name="draw"></a><span class="type">void</span> Q3CanvasPolygonalItem::<span class="name">draw</span> ( <span class="type"><a href="qpainter.html">QPainter</a></span> & <i>p</i> )<tt> [virtual protected]</tt></h3>
<p>Reimplemented from <a href="q3canvasitem.html#draw">Q3CanvasItem::draw</a>().</p>
<p>Reimplemented from <a href="q3canvasitem.html" class="compat">Q3CanvasItem</a>, this draws the polygonal item by setting the pen and brush for the item on the painter <i>p</i> and calling <a href="q3canvaspolygonalitem.html#drawShape">drawShape</a>().</p>
<!-- @@@draw -->
<!-- $$$drawShape[overload1]$$$drawShapeQPainter& -->
<h3 class="fn"><a name="drawShape"></a><span class="type">void</span> Q3CanvasPolygonalItem::<span class="name">drawShape</span> ( <span class="type"><a href="qpainter.html">QPainter</a></span> & <i>p</i> )<tt> [pure virtual protected]</tt></h3>
<p>Subclasses must reimplement this function to draw their shape. The pen and brush of <i>p</i> are already set to <a href="q3canvaspolygonalitem.html#pen">pen</a>() and <a href="q3canvaspolygonalitem.html#brush">brush</a>() prior to calling this function.</p>
<p><b>See also </b><a href="q3canvaspolygonalitem.html#draw">draw</a>().</p>
<!-- @@@drawShape -->
<!-- $$$invalidate[overload1]$$$invalidate -->
<h3 class="fn"><a name="invalidate"></a><span class="type">void</span> Q3CanvasPolygonalItem::<span class="name">invalidate</span> ()<tt> [protected]</tt></h3>
<p>Invalidates all information about the area covered by the canvas item. The item will be updated automatically on the next call that changes the item's status, for example, <a href="q3canvasitem.html#move">move</a>() or <a href="q3canvasitem.html#update">update</a>(). Call this function if you are going to change the shape of the item (as returned by <a href="q3canvaspolygonalitem.html#areaPoints">areaPoints</a>()) while the item is visible.</p>
<!-- @@@invalidate -->
<!-- $$$isValid[overload1]$$$isValid -->
<h3 class="fn"><a name="isValid"></a><span class="type">bool</span> Q3CanvasPolygonalItem::<span class="name">isValid</span> () const<tt> [protected]</tt></h3>
<p>Returns true if the polygonal item's area information has not been invalidated; otherwise returns false.</p>
<p><b>See also </b><a href="q3canvaspolygonalitem.html#invalidate">invalidate</a>().</p>
<!-- @@@isValid -->
<!-- $$$pen[overload1]$$$pen -->
<h3 class="fn"><a name="pen"></a><span class="type"><a href="qpen.html">QPen</a></span> Q3CanvasPolygonalItem::<span class="name">pen</span> () const</h3>
<p>Returns the <a href="qpen.html">QPen</a> used to draw the outline of the item, if any.</p>
<p><b>See also </b><a href="q3canvaspolygonalitem.html#setPen">setPen</a>().</p>
<!-- @@@pen -->
<!-- $$$rtti[overload1]$$$rtti -->
<h3 class="fn"><a name="rtti"></a><span class="type">int</span> Q3CanvasPolygonalItem::<span class="name">rtti</span> () const<tt> [virtual]</tt></h3>
<p>Reimplemented from <a href="q3canvasitem.html#rtti">Q3CanvasItem::rtti</a>().</p>
<p>Returns 2 (<a href="q3canvasitem.html#RttiValues-enum">Q3CanvasItem::Rtti_PolygonalItem</a>).</p>
<p><b>See also </b><a href="q3canvasitem.html#rtti">Q3CanvasItem::rtti</a>().</p>
<!-- @@@rtti -->
<!-- $$$setBrush[overload1]$$$setBrushQBrush -->
<h3 class="fn"><a name="setBrush"></a><span class="type">void</span> Q3CanvasPolygonalItem::<span class="name">setBrush</span> ( <span class="type"><a href="qbrush.html">QBrush</a></span> <i>b</i> )<tt> [virtual]</tt></h3>
<p>Sets the <a href="qbrush.html">QBrush</a> used when drawing the polygonal item to the brush <i>b</i>.</p>
<p><b>See also </b><a href="q3canvaspolygonalitem.html#setPen">setPen</a>(), <a href="q3canvaspolygonalitem.html#brush">brush</a>(), and <a href="q3canvaspolygonalitem.html#drawShape">drawShape</a>().</p>
<!-- @@@setBrush -->
<!-- $$$setPen[overload1]$$$setPenQPen -->
<h3 class="fn"><a name="setPen"></a><span class="type">void</span> Q3CanvasPolygonalItem::<span class="name">setPen</span> ( <span class="type"><a href="qpen.html">QPen</a></span> <i>p</i> )<tt> [virtual]</tt></h3>
<p>Sets the <a href="qpen.html">QPen</a> used when drawing the item to the pen <i>p</i>. Note that many Q3CanvasPolygonalItems do not use the pen value.</p>
<p><b>See also </b><a href="q3canvaspolygonalitem.html#setBrush">setBrush</a>(), <a href="q3canvaspolygonalitem.html#pen">pen</a>(), and <a href="q3canvaspolygonalitem.html#drawShape">drawShape</a>().</p>
<!-- @@@setPen -->
<!-- $$$setWinding[overload1]$$$setWindingbool -->
<h3 class="fn"><a name="setWinding"></a><span class="type">void</span> Q3CanvasPolygonalItem::<span class="name">setWinding</span> ( <span class="type">bool</span> <i>enable</i> )<tt> [protected]</tt></h3>
<p>If <i>enable</i> is true, the polygonal item will use the winding algorithm to determine the "inside" of the polygon; otherwise the odd-even algorithm will be used.</p>
<p>The default is to use the odd-even algorithm.</p>
<p><b>See also </b><a href="q3canvaspolygonalitem.html#winding">winding</a>().</p>
<!-- @@@setWinding -->
<!-- $$$winding[overload1]$$$winding -->
<h3 class="fn"><a name="winding"></a><span class="type">bool</span> Q3CanvasPolygonalItem::<span class="name">winding</span> () const<tt> [protected]</tt></h3>
<p>Returns true if the polygonal item uses the winding algorithm to determine the "inside" of the polygon. Returns false if it uses the odd-even algorithm.</p>
<p>The default is to use the odd-even algorithm.</p>
<p><b>See also </b><a href="q3canvaspolygonalitem.html#setWinding">setWinding</a>().</p>
<!-- @@@winding -->
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