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| 32 | <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>
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| 33 |
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| 34 | <p>The QCanvasEllipse class provides an ellipse or ellipse segment on a QCanvas.
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| 35 | <a href="#details">More...</a>
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| 36 | <p><tt>#include <<a href="qcanvas-h.html">qcanvas.h</a>></tt>
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| 37 | <p>Inherits <a href="qcanvaspolygonalitem.html">QCanvasPolygonalItem</a>.
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| 38 | <p><a href="qcanvasellipse-members.html">List of all member functions.</a>
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| 39 | <h2>Public Members</h2>
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| 40 | <ul>
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| 41 | <li class=fn><a href="#QCanvasEllipse"><b>QCanvasEllipse</b></a> ( QCanvas * canvas )</li>
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| 42 | <li class=fn><a href="#QCanvasEllipse-2"><b>QCanvasEllipse</b></a> ( int width, int height, QCanvas * canvas )</li>
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| 43 | <li class=fn><a href="#QCanvasEllipse-3"><b>QCanvasEllipse</b></a> ( int width, int height, int startangle, int angle, QCanvas * canvas )</li>
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| 44 | <li class=fn><a href="#~QCanvasEllipse"><b>~QCanvasEllipse</b></a> ()</li>
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| 45 | <li class=fn>int <a href="#width"><b>width</b></a> () const</li>
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| 46 | <li class=fn>int <a href="#height"><b>height</b></a> () const</li>
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| 47 | <li class=fn>void <a href="#setSize"><b>setSize</b></a> ( int width, int height )</li>
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| 48 | <li class=fn>void <a href="#setAngles"><b>setAngles</b></a> ( int start, int length )</li>
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| 49 | <li class=fn>int <a href="#angleStart"><b>angleStart</b></a> () const</li>
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| 50 | <li class=fn>int <a href="#angleLength"><b>angleLength</b></a> () const</li>
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| 51 | <li class=fn>virtual int <a href="#rtti"><b>rtti</b></a> () const</li>
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| 52 | </ul>
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| 53 | <h2>Protected Members</h2>
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| 54 | <ul>
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| 55 | <li class=fn>virtual void <a href="#drawShape"><b>drawShape</b></a> ( QPainter & p )</li>
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| 56 | </ul>
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| 57 | <hr><a name="details"></a><h2>Detailed Description</h2>
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| 58 |
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| 59 |
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| 60 | The QCanvasEllipse class provides an ellipse or ellipse segment on a <a href="qcanvas.html">QCanvas</a>.
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| 61 |
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| 62 | <p>
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| 63 |
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| 64 |
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| 65 | <p> A canvas item that paints an ellipse or ellipse segment with a <a href="qbrush.html">QBrush</a>.
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| 66 | The ellipse's height, width, start angle and angle length can be set
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| 67 | at construction time. The size can be changed at runtime with
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| 68 | <a href="#setSize">setSize</a>(), and the angles can be changed (if you're displaying an
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| 69 | ellipse segment rather than a whole ellipse) with <a href="#setAngles">setAngles</a>().
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| 70 | <p> Note that angles are specified in 16ths of a degree.
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| 71 | <p> <a name="anglediagram"></a>
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| 72 | <center><img src="qcanvasellipse.png" alt="Ellipse"></center>
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| 73 | <p> If a start angle and length angle are set then an ellipse segment
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| 74 | will be drawn. The start angle is the angle that goes from zero in a
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| 75 | counter-clockwise direction (shown in green in the diagram). The
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| 76 | length angle is the angle from the start angle in a
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| 77 | counter-clockwise direction (shown in blue in the diagram). The blue
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| 78 | segment is the segment of the ellipse that would be drawn. If no
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| 79 | start angle and length angle are specified the entire ellipse is
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| 80 | drawn.
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| 81 | <p> The ellipse can be drawn on a painter with <a href="#drawShape">drawShape</a>().
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| 82 | <p> Like any other canvas item ellipses can be moved with <a href="qcanvasitem.html#move">move</a>() and
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| 83 | <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>().
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| 84 | <p> Note: QCanvasEllipse does not use the pen.
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| 85 | <p>See also <a href="graphics.html">Graphics Classes</a> and <a href="images.html">Image Processing Classes</a>.
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| 86 |
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| 87 | <hr><h2>Member Function Documentation</h2>
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| 88 | <h3 class=fn><a name="QCanvasEllipse"></a>QCanvasEllipse::QCanvasEllipse ( <a href="qcanvas.html">QCanvas</a> * canvas )
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| 89 | </h3>
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| 90 | Constructs a 32x32 ellipse, centered at (0, 0) on <em>canvas</em>.
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| 91 |
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| 92 | <h3 class=fn><a name="QCanvasEllipse-2"></a>QCanvasEllipse::QCanvasEllipse ( int width, int height, <a href="qcanvas.html">QCanvas</a> * canvas )
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| 93 | </h3>
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| 94 | Constructs a <em>width</em> by <em>height</em> pixel ellipse, centered at
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| 95 | (0, 0) on <em>canvas</em>.
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| 96 |
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| 97 | <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 )
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| 98 | </h3>
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| 99 | Constructs a <em>width</em> by <em>height</em> pixel ellipse, centered at
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| 100 | (0, 0) on <em>canvas</em>. Only a segment of the ellipse is drawn,
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| 101 | starting at angle <em>startangle</em>, and extending for angle <em>angle</em>
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| 102 | (the angle length).
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| 103 | <p> Note that angles are specified in
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| 104 | <small><sup>1</sup>/<sub>16</sub></small>ths of a degree.
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| 105 |
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| 106 | <h3 class=fn><a name="~QCanvasEllipse"></a>QCanvasEllipse::~QCanvasEllipse ()
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| 107 | </h3>
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| 108 | Destroys the ellipse.
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| 109 |
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| 110 | <h3 class=fn>int <a name="angleLength"></a>QCanvasEllipse::angleLength () const
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| 111 | </h3>
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| 112 |
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| 113 | <p> Returns the length angle (the extent of the ellipse segment) in
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| 114 | 16ths of a degree. Initially this will be 360 * 16 (a complete
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| 115 | ellipse).
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| 116 | <p> <p>See also <a href="#setAngles">setAngles</a>() and <a href="#angleStart">angleStart</a>().
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| 117 |
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| 118 | <h3 class=fn>int <a name="angleStart"></a>QCanvasEllipse::angleStart () const
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| 119 | </h3>
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| 120 |
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| 121 | <p> Returns the start angle in 16ths of a degree. Initially
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| 122 | this will be 0.
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| 123 | <p> <p>See also <a href="#setAngles">setAngles</a>() and <a href="#angleLength">angleLength</a>().
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| 124 |
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| 125 | <h3 class=fn>void <a name="drawShape"></a>QCanvasEllipse::drawShape ( <a href="qpainter.html">QPainter</a> & p )<tt> [virtual protected]</tt>
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| 126 | </h3>
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| 127 | 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>.
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| 128 | <p> Note that QCanvasEllipse does not support an outline (the pen is
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| 129 | always NoPen).
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| 130 |
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| 131 | <p>Reimplemented from <a href="qcanvaspolygonalitem.html#drawShape">QCanvasPolygonalItem</a>.
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| 132 | <h3 class=fn>int <a name="height"></a>QCanvasEllipse::height () const
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| 133 | </h3>
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| 134 | Returns the height of the ellipse.
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| 135 |
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| 136 | <h3 class=fn>int <a name="rtti"></a>QCanvasEllipse::rtti () const<tt> [virtual]</tt>
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| 137 | </h3>
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| 138 | Returns 6 (QCanvasItem::Rtti_Ellipse).
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| 139 | <p> <p>See also <a href="qcanvasitem.html#rtti">QCanvasItem::rtti</a>().
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| 140 |
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| 141 | <p>Reimplemented from <a href="qcanvaspolygonalitem.html#rtti">QCanvasPolygonalItem</a>.
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| 142 | <h3 class=fn>void <a name="setAngles"></a>QCanvasEllipse::setAngles ( int start, int length )
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| 143 | </h3>
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| 144 | Sets the angles for the ellipse. The start angle is <em>start</em> and
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| 145 | the extent of the segment is <em>length</em> (the angle length) from the
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| 146 | <em>start</em>. The angles are specified in 16ths of a degree. By
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| 147 | default the ellipse will start at 0 and have an angle length of
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| 148 | 360 * 16 (a complete ellipse).
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| 149 | <p> <p>See also <a href="#angleStart">angleStart</a>() and <a href="#angleLength">angleLength</a>().
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| 150 |
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| 151 | <h3 class=fn>void <a name="setSize"></a>QCanvasEllipse::setSize ( int width, int height )
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| 152 | </h3>
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| 153 | Sets the <em>width</em> and <em>height</em> of the ellipse.
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| 154 |
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| 155 | <h3 class=fn>int <a name="width"></a>QCanvasEllipse::width () const
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| 156 | </h3>
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| 157 | Returns the width of the ellipse.
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| 158 |
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| 159 | <!-- eof -->
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| 160 | <hr><p>
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| 161 | This file is part of the <a href="index.html">Qt toolkit</a>.
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| 162 | Copyright © 1995-2007
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| 163 | <a href="http://www.trolltech.com/">Trolltech</a>. All Rights Reserved.<p><address><hr><div align=center>
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| 164 | <table width=100% cellspacing=0 border=0><tr>
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| 165 | <td>Copyright © 2007
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| 166 | <a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
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| 167 | <td align=right><div align=right>Qt 3.3.8</div>
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| 168 | </table></div></address></body>
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| 169 | </html>
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