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authorTimothy Pearson <kb9vqf@pearsoncomputing.net>2011-07-10 15:24:15 -0500
committerTimothy Pearson <kb9vqf@pearsoncomputing.net>2011-07-10 15:24:15 -0500
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+<title>QCanvasEllipse 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>QCanvasEllipse Class Reference<br><small>[<a href="canvas.html">canvas module</a>]</small></h1>
+
+<p>The QCanvasEllipse class provides an ellipse or ellipse segment on a QCanvas.
+<a href="#details">More...</a>
+<p><tt>#include &lt;<a href="qcanvas-h.html">qcanvas.h</a>&gt;</tt>
+<p>Inherits <a href="qcanvaspolygonalitem.html">QCanvasPolygonalItem</a>.
+<p><a href="qcanvasellipse-members.html">List of all member functions.</a>
+<h2>Public Members</h2>
+<ul>
+<li class=fn><a href="#QCanvasEllipse"><b>QCanvasEllipse</b></a> ( QCanvas&nbsp;*&nbsp;canvas )</li>
+<li class=fn><a href="#QCanvasEllipse-2"><b>QCanvasEllipse</b></a> ( int&nbsp;width, int&nbsp;height, QCanvas&nbsp;*&nbsp;canvas )</li>
+<li class=fn><a href="#QCanvasEllipse-3"><b>QCanvasEllipse</b></a> ( int&nbsp;width, int&nbsp;height, int&nbsp;startangle, int&nbsp;angle, QCanvas&nbsp;*&nbsp;canvas )</li>
+<li class=fn><a href="#~QCanvasEllipse"><b>~QCanvasEllipse</b></a> ()</li>
+<li class=fn>int <a href="#width"><b>width</b></a> () const</li>
+<li class=fn>int <a href="#height"><b>height</b></a> () const</li>
+<li class=fn>void <a href="#setSize"><b>setSize</b></a> ( int&nbsp;width, int&nbsp;height )</li>
+<li class=fn>void <a href="#setAngles"><b>setAngles</b></a> ( int&nbsp;start, int&nbsp;length )</li>
+<li class=fn>int <a href="#angleStart"><b>angleStart</b></a> () const</li>
+<li class=fn>int <a href="#angleLength"><b>angleLength</b></a> () const</li>
+<li class=fn>virtual int <a href="#rtti"><b>rtti</b></a> () const</li>
+</ul>
+<h2>Protected Members</h2>
+<ul>
+<li class=fn>virtual void <a href="#drawShape"><b>drawShape</b></a> ( QPainter&nbsp;&amp;&nbsp;p )</li>
+</ul>
+<hr><a name="details"></a><h2>Detailed Description</h2>
+
+
+The QCanvasEllipse class provides an ellipse or ellipse segment on a <a href="qcanvas.html">QCanvas</a>.
+
+<p>
+
+
+<p> A canvas item that paints an ellipse or ellipse segment with a <a href="qbrush.html">QBrush</a>.
+The ellipse's height, width, start angle and angle length can be set
+at construction time. The size can be changed at runtime with
+<a href="#setSize">setSize</a>(), and the angles can be changed (if you're displaying an
+ellipse segment rather than a whole ellipse) with <a href="#setAngles">setAngles</a>().
+<p> Note that angles are specified in 16ths of a degree.
+<p> <a name="anglediagram"></a>
+<center><img src="qcanvasellipse.png" alt="Ellipse"></center>
+<p> If a start angle and length angle are set then an ellipse segment
+will be drawn. The start angle is the angle that goes from zero in a
+counter-clockwise direction (shown in green in the diagram). The
+length angle is the angle from the start angle in a
+counter-clockwise direction (shown in blue in the diagram). The blue
+segment is the segment of the ellipse that would be drawn. If no
+start angle and length angle are specified the entire ellipse is
+drawn.
+<p> The ellipse can be drawn on a painter with <a href="#drawShape">drawShape</a>().
+<p> Like any other canvas item ellipses can be moved with <a href="qcanvasitem.html#move">move</a>() and
+<a href="qcanvasitem.html#moveBy">moveBy</a>(), or by setting coordinates with <a href="qcanvasitem.html#setX">setX</a>(), <a href="qcanvasitem.html#setY">setY</a>() and <a href="qcanvasitem.html#setZ">setZ</a>().
+<p> Note: QCanvasEllipse does not use the pen.
+<p>See also <a href="graphics.html">Graphics Classes</a> and <a href="images.html">Image Processing Classes</a>.
+
+<hr><h2>Member Function Documentation</h2>
+<h3 class=fn><a name="QCanvasEllipse"></a>QCanvasEllipse::QCanvasEllipse ( <a href="qcanvas.html">QCanvas</a>&nbsp;*&nbsp;canvas )
+</h3>
+Constructs a 32x32 ellipse, centered at (0, 0) on <em>canvas</em>.
+
+<h3 class=fn><a name="QCanvasEllipse-2"></a>QCanvasEllipse::QCanvasEllipse ( int&nbsp;width, int&nbsp;height, <a href="qcanvas.html">QCanvas</a>&nbsp;*&nbsp;canvas )
+</h3>
+Constructs a <em>width</em> by <em>height</em> pixel ellipse, centered at
+(0, 0) on <em>canvas</em>.
+
+<h3 class=fn><a name="QCanvasEllipse-3"></a>QCanvasEllipse::QCanvasEllipse ( int&nbsp;width, int&nbsp;height, int&nbsp;startangle, int&nbsp;angle, <a href="qcanvas.html">QCanvas</a>&nbsp;*&nbsp;canvas )
+</h3>
+Constructs a <em>width</em> by <em>height</em> pixel ellipse, centered at
+(0, 0) on <em>canvas</em>. Only a segment of the ellipse is drawn,
+starting at angle <em>startangle</em>, and extending for angle <em>angle</em>
+(the angle length).
+<p> Note that angles are specified in
+<small><sup>1</sup>/<sub>16</sub></small>ths of a degree.
+
+<h3 class=fn><a name="~QCanvasEllipse"></a>QCanvasEllipse::~QCanvasEllipse ()
+</h3>
+Destroys the ellipse.
+
+<h3 class=fn>int <a name="angleLength"></a>QCanvasEllipse::angleLength () const
+</h3>
+
+<p> Returns the length angle (the extent of the ellipse segment) in
+16ths of a degree. Initially this will be 360 * 16 (a complete
+ellipse).
+<p> <p>See also <a href="#setAngles">setAngles</a>() and <a href="#angleStart">angleStart</a>().
+
+<h3 class=fn>int <a name="angleStart"></a>QCanvasEllipse::angleStart () const
+</h3>
+
+<p> Returns the start angle in 16ths of a degree. Initially
+this will be 0.
+<p> <p>See also <a href="#setAngles">setAngles</a>() and <a href="#angleLength">angleLength</a>().
+
+<h3 class=fn>void <a name="drawShape"></a>QCanvasEllipse::drawShape ( <a href="qpainter.html">QPainter</a>&nbsp;&amp;&nbsp;p )<tt> [virtual protected]</tt>
+</h3>
+Draws the ellipse, centered at <a href="qcanvasitem.html#x">x</a>(), <a href="qcanvasitem.html#y">y</a>() using the painter <em>p</em>.
+<p> Note that QCanvasEllipse does not support an outline (the pen is
+always NoPen).
+
+<p>Reimplemented from <a href="qcanvaspolygonalitem.html#drawShape">QCanvasPolygonalItem</a>.
+<h3 class=fn>int <a name="height"></a>QCanvasEllipse::height () const
+</h3>
+Returns the height of the ellipse.
+
+<h3 class=fn>int <a name="rtti"></a>QCanvasEllipse::rtti () const<tt> [virtual]</tt>
+</h3>
+Returns 6 (QCanvasItem::Rtti_Ellipse).
+<p> <p>See also <a href="qcanvasitem.html#rtti">QCanvasItem::rtti</a>().
+
+<p>Reimplemented from <a href="qcanvaspolygonalitem.html#rtti">QCanvasPolygonalItem</a>.
+<h3 class=fn>void <a name="setAngles"></a>QCanvasEllipse::setAngles ( int&nbsp;start, int&nbsp;length )
+</h3>
+Sets the angles for the ellipse. The start angle is <em>start</em> and
+the extent of the segment is <em>length</em> (the angle length) from the
+<em>start</em>. The angles are specified in 16ths of a degree. By
+default the ellipse will start at 0 and have an angle length of
+360 * 16 (a complete ellipse).
+<p> <p>See also <a href="#angleStart">angleStart</a>() and <a href="#angleLength">angleLength</a>().
+
+<h3 class=fn>void <a name="setSize"></a>QCanvasEllipse::setSize ( int&nbsp;width, int&nbsp;height )
+</h3>
+Sets the <em>width</em> and <em>height</em> of the ellipse.
+
+<h3 class=fn>int <a name="width"></a>QCanvasEllipse::width () const
+</h3>
+Returns the width of the ellipse.
+
+<!-- eof -->
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+<td align=right><div align=right>Qt 3.3.8</div>
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