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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"><!-- /home/reggie/tmp/qt-3.0-reggie-5401/qt-x11-commercial-3.0.5/src/canvas/qcanvas.cpp:4439 --><html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>QCanvasEllipse Class</title><style type="text/css"><!--h3.fn,span.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>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 <<a href="qcanvas-h.html">qcanvas.h</a>></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><div class=fn><a href="#QCanvasEllipse"><b>QCanvasEllipse</b></a> ( QCanvas * canvas )</div></li><li><div class=fn><a href="#QCanvasEllipse-2"><b>QCanvasEllipse</b></a> ( int width, int height, QCanvas * canvas )</div></li><li><div class=fn><a href="#QCanvasEllipse-3"><b>QCanvasEllipse</b></a> ( int width, int height, int startangle, int angle, QCanvas * canvas )</div></li><li><div class=fn><a href="#~QCanvasEllipse"><b>~QCanvasEllipse</b></a> ()</div></li><li><div class=fn>int <a href="#width"><b>width</b></a> () const</div></li><li><div class=fn>int <a href="#height"><b>height</b></a> () const</div></li><li><div class=fn>void <a href="#setSize"><b>setSize</b></a> ( int width, int height )</div></li><li><div class=fn>void <a href="#setAngles"><b>setAngles</b></a> ( int start, int length )</div></li><li><div class=fn>int <a href="#angleStart"><b>angleStart</b></a> () const</div></li><li><div class=fn>int <a href="#angleLength"><b>angleLength</b></a> () const</div></li><li><div class=fn>virtual int <a href="#rtti"><b>rtti</b></a> () const</div></li></ul><h2>Protected Members</h2><ul><li><div class=fn>virtual void <a href="#drawShape"><b>drawShape</b></a> ( QPainter & p )</div></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> 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 setat 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 anellipse 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" width="300" height="200" alt="Ellipse"></center>If a start angle and length angle are set then an ellipse segmentwill be drawn. The start angle is the angle that goes from zero in acounter-clockwise direction (shown in green in the diagram). Thelength angle is the angle from the start angle in acounter-clockwise direction (shown in blue in the diagram). The bluesegment is the segment of the ellipse that would be drawn. If nostart angle and length angle are specified the entire ellipse isdrawn.<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>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> * 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 width, int height, <a href="qcanvas.html">QCanvas</a> * 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 width, int height, int startangle, int angle, <a href="qcanvas.html">QCanvas</a> * 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) in16ths of a degree. Initially this will be 360 * 16 (a completeellipse).<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. Initiallythis 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> & 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 (pen isalways 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 start, int length )</h3>Sets the angles for the ellipse. The start angle is <em>start</em> and theextent 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 defaultthe 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 width, int 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 --><hr><p>This file is part of the <a href="index.html">Qt toolkit</a>.Copyright © 1995-2002<a href="http://www.trolltech.com/">Trolltech</a>. All Rights Reserved.<p><address><hr><div align=center><table width=100% cellspacing=0 border=0><tr><td>Copyright © 2002 <a href="http://www.trolltech.com">Trolltech</a><td><a href="http://www.trolltech.com/trademarks.html">Trademarks</a><td align=right><div align=right>Qt version 3.0.5</div></table></div></address></body></html>⌨️ 快捷键说明
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