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<title>MathGL 2.1.2: 5. Widget classes</title>

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<a name="Widget-classes-1"></a>
<h1 class="chapter">5. Widget classes</h1>
<a name="index-mglWindow"></a>
<a name="index-mglGLUT"></a>
<a name="index-Fl_005fMathGL"></a>
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<a name="index-window-1"></a>
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<p>There are set of &ldquo;window&rdquo; classes for making a window with MathGL graphics: <code>mglWindow</code> and <code>mglGLUT</code> for whole window, <code>Fl_MathGL</code> and <code>QMathGL</code> as widgets. All these classes allow user to show, rotate, export, and change view of the plot using keyboard. Most of them (except <code>mglGLUT</code>) also have toolbar and menu for simplifying plot manipulation. All window classes have mostly the same set of functions.
</p>
<p>For drawing you can use: <code>NULL</code> pointer if you&rsquo;ll update plot manually, global callback function of type <code>int draw(<code>HMGL</code> gr, <code>void *</code>p)</code> or <code>int draw(<code>mglGraph *</code>gr)</code>, or instance of class derived from <code>mglDraw</code> class. This class is defined in <code>#include &lt;mgl2/window.h&gt;</code> and have only 2 methods:
</p><pre class="verbatim">class mglDraw
{
public:
    virtual int Draw(mglGraph *) { return 0; };
    virtual void Reload() {};
};
</pre><p>You should inherit yours class from <code>mglDraw</code> and re-implement one or both functions for drawing.
</p>
<table class="menu" border="0" cellspacing="0">
<tr><td align="left" valign="top"><a href="mathgl_en_48.html#mglWindow-class">5.1 mglWindow class</a></td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top"><a href="mathgl_en_49.html#Fl_005fMathGL-class">5.2 Fl_MathGL class</a></td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top"><a href="mathgl_en_50.html#QMathGL-class">5.3 QMathGL class</a></td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
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