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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"><html> <head> <title> Canvas Items </title> <meta name="GENERATOR" content= "Modular DocBook HTML Stylesheet Version 1.45"> <link rel="HOME" title="GTK+ / Gnome Application Development" href="ggad.html"> <link rel="UP" title="GTK+/Gnome Object Hierarchy" href= "hierarchy.html"> <link rel="PREVIOUS" title="Widgets" href="z207.html"> <link rel="NEXT" title="Miscellaneous Objects" href= "z781.html"> </head> <body bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink= "#840084" alink="#0000FF"> <div class="NAVHEADER"> <table width="100%" border="0" bgcolor="#ffffff" cellpadding= "1" cellspacing="0"> <tr> <th colspan="4" align="center"> <font color="#000000" size="2">GTK+ / Gnome Application Development</font> </th> </tr> <tr> <td width="25%" bgcolor="#ffffff" align="left"> <a href="z207.html"><font color="#0000ff" size="2"><b> <<< Previous</b></font></a> </td> <td width="25%" colspan="2" bgcolor="#ffffff" align= "center"> <font color="#0000ff" size="2"><b><a href="ggad.html"> <font color="#0000ff" size="2"><b> Home</b></font></a></b></font> </td> <td width="25%" bgcolor="#ffffff" align="right"> <a href="z781.html"><font color="#0000ff" size="2"><b> Next >>></b></font></a> </td> </tr> </table> </div> <div class="SECT1"> <h1 class="SECT1"> <a name="Z736">Canvas Items</a> </h1> <div class="SECT2"> <h2 class="SECT2"> <a name="Z737"><span class="STRUCTNAME"> GnomeCanvasItem</span></a> </h2> <div class="SECT3"> <h3 class="SECT3"> <a name="Z738">Library</a> </h3> <p> Gnome </p> </div> <div class="SECT3"> <h3 class="SECT3"> <a name="Z739">Header File</a> </h3> <p> <tt class="FILENAME">libgnomeui/gnome-canvas.h</tt> </p> </div> <div class="SECT3"> <h3 class="SECT3"> <a name="Z740">Description</a> </h3> <p> <span class="STRUCTNAME">GnomeCanvasItem</span> is the abstract base class for canvas items. <a href= "cha-canvas.html">the chapter called <i><tt class= "CLASSNAME">GnomeCanvas</tt></i></a> and <a href= "cha-canvasitem.html">the chapter called <i>Writing a <span class="STRUCTNAME">GnomeCanvasItem</span></i></a> describe it in detail. </p> </div> </div> <div class="SECT2"> <h2 class="SECT2"> <a name="Z741"><span class="STRUCTNAME"> GnomeCanvasRE</span></a> </h2> <div class="SECT3"> <h3 class="SECT3"> <a name="Z742">Library</a> </h3> <p> Gnome </p> </div> <div class="SECT3"> <h3 class="SECT3"> <a name="Z743">Header File</a> </h3> <p> <tt class="FILENAME"> libgnomeui/gnome-canvas-rect-ellipse.h</tt> </p> </div> <div class="SECT3"> <h3 class="SECT3"> <a name="Z744">Description</a> </h3> <p> <span class="STRUCTNAME">GnomeCanvasRE</span> is the base class for the rectangle and ellipse canvas items. In the future, it may also be the base class for a <span class="STRUCTNAME">GnomeCanvasArc</span> item. <a href="sec-itemreference.html#SEC-CANVASRE">the section called <i>Rectangle and Ellipse Items</i> in the chapter called <i><tt class="CLASSNAME"> GnomeCanvas</tt></i></a> details this canvas item. </p> </div> </div> <div class="SECT2"> <h2 class="SECT2"> <a name="Z745"><span class="STRUCTNAME"> GnomeCanvasEllipse</span></a> </h2> <div class="SECT3"> <h3 class="SECT3"> <a name="Z746">Library</a> </h3> <p> Gnome </p> </div> <div class="SECT3"> <h3 class="SECT3"> <a name="Z747">Header File</a> </h3> <p> <tt class="FILENAME"> libgnomeui/gnome-canvas-rect-ellipse.h</tt> </p> </div> <div class="SECT3"> <h3 class="SECT3"> <a name="Z748">Description</a> </h3> <p> <span class="STRUCTNAME">GnomeCanvasEllipse</span> renders an ellipse on the canvas; see <a href= "sec-itemreference.html#SEC-CANVASRE">the section called <i>Rectangle and Ellipse Items</i> in the chapter called <i><tt class="CLASSNAME"> GnomeCanvas</tt></i></a> for more details. </p> </div> </div> <div class="SECT2"> <h2 class="SECT2"> <a name="Z749"><span class="STRUCTNAME"> GnomeCanvasRect</span></a> </h2> <div class="SECT3"> <h3 class="SECT3"> <a name="Z750">Library</a> </h3> <p> Gnome </p> </div> <div class="SECT3"> <h3 class="SECT3"> <a name="Z751">Header File</a> </h3> <p> <tt class="FILENAME">libgnomeui/gnome.h</tt> </p> </div> <div class="SECT3"> <h3 class="SECT3"> <a name="Z752">Description</a> </h3> <p> <span class="STRUCTNAME">GnomeCanvasRect</span> renders a rectangle on the canvas; see <a href= "sec-itemreference.html#SEC-CANVASRE">the section called <i>Rectangle and Ellipse Items</i> in the chapter called <i><tt class="CLASSNAME"> GnomeCanvas</tt></i></a> for more details. </p> </div> </div> <div class="SECT2"> <h2 class="SECT2"> <a name="Z753"><span class="STRUCTNAME"> GnomeCanvasGroup</span></a> </h2> <div class="SECT3"> <h3 class="SECT3"> <a name="Z754">Library</a> </h3> <p> Gnome </p> </div> <div class="SECT3"> <h3 class="SECT3"> <a name="Z755">Header File</a> </h3> <p> <tt class="FILENAME">libgnomeui/gnome-canvas.h</tt> </p> </div> <div class="SECT3"> <h3 class="SECT3"> <a name="Z756">Description</a> </h3> <p> <span class="STRUCTNAME">GnomeCanvasGroup</span> is a <span class="STRUCTNAME">GnomeCanvasItem</span> that contains other <span class="STRUCTNAME"> GnomeCanvasItem</span>s. It creates the hierarchical tree structure of the items on a <tt class="CLASSNAME"> GnomeCanvas</tt>. The <tt class="CLASSNAME"> GnomeCanvas</tt> creates a special <span class= "STRUCTNAME">GnomeCanvasGroup</span>, called the <i class="FIRSTTERM">root</i>; all user-created canvas items must be added below the root group. See <a href= "cha-canvas.html">the chapter called <i><tt class= "CLASSNAME">GnomeCanvas</tt></i></a> for more details. </p> </div> </div> <div class="SECT2"> <h2 class="SECT2"> <a name="Z757"><span class="STRUCTNAME"> GnomeCanvasImage</span></a> </h2> <div class="SECT3"> <h3 class="SECT3"> <a name="Z758">Library</a> </h3> <p> Gnome⌨️ 快捷键说明
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