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<a name="mglWindow-class"></a>
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<a name="mglWindow-class-1"></a>
<h2 class="section">5.1 mglWindow class</h2>
<a name="index-mglWindow-1"></a>
<a name="index-window-2"></a>

<p>This class is derived from mglGraph class (see <a href="mathgl_en_29.html#MathGL-core">MathGL core</a>). It is defined in <code>#include &lt;mgl2/window.h&gt;</code>. It provide methods for handling window with MathGL graphics. Similar classes are exist for each widget library: <code>mglQT</code> in <code>#include &lt;mgl2/qt.h&gt;</code>, <code>mglFLTK</code> in <code>#include &lt;mgl2/fltk.h&gt;</code>, <code>mglWX</code> in <code>#include &lt;mgl2/wx.h&gt;</code>.
</p>
<dl>
<dt><a name="index-mglWindow-2"></a><u>Constructor on <code>mglWindow</code>:</u> <b>mglWindow</b><i> (<code>const char *</code>title=<code>&quot;MathGL&quot;</code>)</i></dt>
<dt><a name="index-mglWindow-3"></a><u>Constructor on <code>mglWindow</code>:</u> <b>mglWindow</b><i> (<code>int</code> (*draw)(<code>HMGL</code> gr, <code>void *</code>p), <code>const char *</code>title=<code>&quot;MathGL&quot;</code>, <code>void *</code>par=<code>NULL</code>, <code>int</code> kind=<code>0</code>, <code>void</code> (*reload)(<code>HMGL</code> gr, <code>void *</code>p)=0)</i></dt>
<dt><a name="index-mglWindow-4"></a><u>Constructor on <code>mglWindow</code>:</u> <b>mglWindow</b><i> (<code>int</code> (*draw)(<code>mglGraph *</code>gr), <code>const char *</code>title=<code>&quot;MathGL&quot;</code>, <code>int</code> kind=<code>0</code>)</i></dt>
<dt><a name="index-mglWindow-5"></a><u>Constructor on <code>mglWindow</code>:</u> <b>mglWindow</b><i> (<code>mglDraw *</code>draw, <code>const char *</code>title=<code>&quot;MathGL&quot;</code>, <code>int</code> kind=<code>0</code>)</i></dt>
<dt><a name="index-mgl_005fcreate_005fgraph_005fqt"></a><u>C function:</u> <code>HMGL</code> <b>mgl_create_graph_qt</b><i> (<code>int</code> (*draw)(<code>HMGL</code> gr, <code>void *</code>p), <code>const char *</code>title, <code>void *</code>par, <code>void</code> (*reload)(<code>HMGL</code> gr, <code>void *</code>p))</i></dt>
<dt><a name="index-mgl_005fcreate_005fgraph_005ffltk"></a><u>C function:</u> <code>HMGL</code> <b>mgl_create_graph_fltk</b><i> (<code>int</code> (*draw)(<code>HMGL</code> gr, <code>void *</code>p), <code>const char *</code>title, <code>void *</code>par, <code>void</code> (*reload)(<code>HMGL</code> gr, <code>void *</code>p))</i></dt>
<dt><a name="index-mgl_005fcreate_005fgraph_005fglut"></a><u>C function:</u> <code>HMGL</code> <b>mgl_create_graph_glut</b><i> (<code>int</code> (*draw)(<code>HMGL</code> gr, <code>void *</code>p), <code>const char *</code>title, <code>void *</code>par, <code>void</code> (*reload)(<code>HMGL</code> gr, <code>void *</code>p))</i></dt>
<dd>
<p>Creates a window for plotting. Parameter <var>draw</var> sets a pointer to drawing function (this is the name of function) or instance of <code>mglDraw</code> class. There is support of a list of plots (frames). So as one can prepare a set of frames at first and redraw it fast later (but it requires more memory). Function should return positive number of frames for the list or zero if it will plot directly. Note, that <var>draw</var> can be <code>NULL</code> for displaying static bitmaps only (no animation or slides). Parameter <var>title</var> sets the title of the window. Parameter <var>par</var> contains pointer to data for the plotting function <var>draw</var>. Parameter <var>kind</var> may have following values: &lsquo;<samp>0</samp>&rsquo; &ndash; use FLTK window, &lsquo;<samp>1</samp>&rsquo; &ndash; use Qt window.
</p>
<p>There are some keys handles for manipulating by the plot: &rsquo;a&rsquo;, &rsquo;d&rsquo;, &rsquo;w&rsquo;, &rsquo;s&rsquo; for the rotating; &rsquo;,&rsquo;, &rsquo;.&rsquo; for viewing of the previous or next frames in the list; &rsquo;r&rsquo; for the switching of transparency; &rsquo;f&rsquo; for the switching of lightning; &rsquo;x&rsquo; for hiding (closing) the window.
</p></dd></dl>

<dl>
<dt><a name="index-RunThr"></a><u>Method on <code>mglWindow</code>:</u> <code>int</code> <b>RunThr</b><i> ()</i></dt>
<dt><a name="index-mgl_005ffltk_005fthr"></a><u>C function:</u> <code>int</code> <b>mgl_fltk_thr</b><i> ()</i></dt>
<dd><p>Run main loop for event handling in separate thread. Note, right now it work for FLTK windows only.
</p></dd></dl>

<dl>
<dt><a name="index-Run"></a><u>Method on <code>mglWindow</code>:</u> <code>int</code> <b>Run</b><i> ()</i></dt>
<dt><a name="index-mgl_005fqt_005frun"></a><u>C function:</u> <code>int</code> <b>mgl_qt_run</b><i> ()</i></dt>
<dt><a name="index-mgl_005ffltk_005frun"></a><u>C function:</u> <code>int</code> <b>mgl_fltk_run</b><i> ()</i></dt>
<dd><p>Run main loop for event handling. Usually it should be called in a separate thread or as last function call in <code>main()</code>.
</p></dd></dl>

<dl>
<dt><a name="index-SetClickFunc"></a><u>Method on <code>mglWindow</code>:</u> <code>void</code> <b>SetClickFunc</b><i> (<code>void</code> (*func)(<code>HMGL</code> gr, <code>void *</code>p))</i></dt>
<dt><a name="index-mgl_005fset_005fclick_005ffunc"></a><u>C function:</u> <code>void</code> <b>mgl_set_click_func</b><i> (<code>void</code> (*func)(<code>HMGL</code> gr, <code>void *</code>p))</i></dt>
<dd><p>Set callback function <code>func</code> which will be called on mouse click.
</p></dd></dl>

<dl>
<dt><a name="index-ToggleAlpha"></a><u>Method on <code>mglWindow</code>:</u> <code>void</code> <b>ToggleAlpha</b><i> ()</i></dt>
<dt><a name="index-mgl_005fwnd_005ftoggle_005falpha"></a><u>C function:</u> <code>void</code> <b>mgl_wnd_toggle_alpha</b><i> (<code>HMGL</code> gr)</i></dt>
<dd><p>Switch on/off transparency but do not overwrite switches in user drawing function.
</p></dd></dl>
<dl>
<dt><a name="index-ToggleLight"></a><u>Method on <code>mglWindow</code>:</u> <code>void</code> <b>ToggleLight</b><i> ()</i></dt>
<dt><a name="index-mgl_005fwnd_005ftoggle_005flight"></a><u>C function:</u> <code>void</code> <b>mgl_wnd_toggle_light</b><i> (<code>HMGL</code> gr)</i></dt>
<dd><p>Switch on/off lighting but do not overwrite switches in user drawing function.
</p></dd></dl>
<dl>
<dt><a name="index-ToggleRotate"></a><u>Method on <code>mglWindow</code>:</u> <code>void</code> <b>ToggleRotate</b><i> ()</i></dt>
<dt><a name="index-mgl_005fwnd_005ftoggle_005frotate"></a><u>C function:</u> <code>void</code> <b>mgl_wnd_toggle_rotate</b><i> (<code>HMGL</code> gr)</i></dt>
<dd><p>Switch on/off rotation by mouse. Usually, left button is used for rotation, middle button for shift, right button for zoom/perspective.
</p></dd></dl>
<dl>
<dt><a name="index-ToggleZoom"></a><u>Method on <code>mglWindow</code>:</u> <code>void</code> <b>ToggleZoom</b><i> ()</i></dt>
<dt><a name="index-mgl_005fwnd_005ftoggle_005fzoom"></a><u>C function:</u> <code>void</code> <b>mgl_wnd_toggle_zoom</b><i> (<code>HMGL</code> gr)</i></dt>
<dd><p>Switch on/off zooming by mouse. Just select rectangular region by mouse and it will be zoomed in.
</p></dd></dl>
<dl>
<dt><a name="index-ToggleNo"></a><u>Method on <code>mglWindow</code>:</u> <code>void</code> <b>ToggleNo</b><i> ()</i></dt>
<dt><a name="index-mgl_005fwnd_005ftoggle_005fno"></a><u>C function:</u> <code>void</code> <b>mgl_wnd_toggle_no</b><i> (<code>HMGL</code> gr)</i></dt>
<dd><p>Switch off all zooming and rotation and restore initial state.
</p></dd></dl>
<dl>
<dt><a name="index-Update"></a><u>Method on <code>mglWindow</code>:</u> <code>void</code> <b>Update</b><i> ()</i></dt>
<dt><a name="index-mgl_005fwnd_005fupdate"></a><u>C function:</u> <code>void</code> <b>mgl_wnd_update</b><i> (<code>HMGL</code> gr)</i></dt>
<dd><p>Update window contents. This is very useful function for manual updating the plot while long calculation was running in parallel thread.
</p></dd></dl>
<dl>
<dt><a name="index-ReLoad"></a><u>Method on <code>mglWindow</code>:</u> <code>void</code> <b>ReLoad</b><i> ()</i></dt>
<dt><a name="index-mgl_005fwnd_005freload"></a><u>C function:</u> <code>void</code> <b>mgl_wnd_reload</b><i> (<code>HMGL</code> gr)</i></dt>
<dd><p>Reload user data and update picture. This function also update number of frames which drawing function can create.
</p></dd></dl>
<dl>
<dt><a name="index-Adjust-2"></a><u>Method on <code>mglWindow</code>:</u> <code>void</code> <b>Adjust</b><i> ()</i></dt>
<dt><a name="index-mgl_005fwnd_005fadjust"></a><u>C function:</u> <code>void</code> <b>mgl_wnd_adjust</b><i> (<code>HMGL</code> gr)</i></dt>
<dd><p>Adjust size of bitmap to window size.
</p></dd></dl>
<dl>
<dt><a name="index-NextFrame"></a><u>Method on <code>mglWindow</code>:</u> <code>void</code> <b>NextFrame</b><i> ()</i></dt>
<dt><a name="index-mgl_005fwnd_005fnext_005fframe"></a><u>C function:</u> <code>void</code> <b>mgl_wnd_next_frame</b><i> (<code>HMGL</code> gr)</i></dt>
<dd><p>Show next frame if one.
</p></dd></dl>
<dl>
<dt><a name="index-PrevFrame"></a><u>Method on <code>mglWindow</code>:</u> <code>void</code> <b>PrevFrame</b><i> ()</i></dt>
<dt><a name="index-mgl_005fwnd_005fprev_005fframe"></a><u>C function:</u> <code>void</code> <b>mgl_wnd_prev_frame</b><i> (<code>HMGL</code> gr)</i></dt>
<dd><p>Show previous frame if one.
</p></dd></dl>
<dl>
<dt><a name="index-Animation"></a><u>Method on <code>mglWindow</code>:</u> <code>void</code> <b>Animation</b><i> ()</i></dt>
<dt><a name="index-mgl_005fwnd_005fanimation"></a><u>C function:</u> <code>void</code> <b>mgl_wnd_animation</b><i> (<code>HMGL</code> gr)</i></dt>
<dd><p>Run/stop slideshow (animation) of frames.
</p></dd></dl>

<dl>
<dt><a name="index-SetDelay"></a><u>Method on <code>mglWindow</code>:</u> <code>void</code> <b>SetDelay</b><i> (<code>double</code> dt)</i></dt>
<dt><a name="index-mgl_005fwnd_005fset_005fdelay"></a><u>C function:</u> <code>void</code> <b>mgl_wnd_set_delay</b><i> (<code>HMGL</code> gr, <code>double</code> dt)</i></dt>
<dd><p>Sets delay for animation in seconds. Default value is 1 sec.
</p></dd></dl>

<dl>
<dt><a name="index-GetDelay"></a><u>Method on <code>mglWindow</code>:</u> <code>double</code> <b>GetDelay</b><i> ()</i></dt>
<dt><a name="index-mgl_005fwnd_005fget_005fdelay"></a><u>C function:</u> <code>double</code> <b>mgl_wnd_get_delay</b><i> (<code>HMGL</code> gr)</i></dt>
<dd><p>Gets delay for animation in seconds.
</p></dd></dl>

<dl>
<dt><a name="index-Setup"></a><u>Method on <code>mglWindow</code>:</u> <code>void</code> <b>Setup</b><i> (<code>bool</code> clfupd=<code>true</code>, <code>bool</code> showpos=<code>false</code>)</i></dt>
<dt><a name="index-mgl_005fsetup_005fwindow"></a><u>C function:</u> <code>void</code> <b>mgl_setup_window</b><i> (<code>HMGL</code> gr, <code>bool</code> clfupd, <code>bool</code> showpos)</i></dt>
<dd><p>Enable/disable flags for:
</p><ul>
<li>
clearing plot before Update();
</li><li>
showing the last mouse click position in the widget.
</li></ul>
</dd></dl>

<dl>
<dt><a name="index-LastMousePos"></a><u>Method on <code>mglWindow</code>:</u> <code>mglPoint</code> <b>LastMousePos</b><i> ()</i></dt>
<dt><a name="index-mgl_005fget_005flast_005fmouse_005fpos"></a><u>C function:</u> <code>void</code> <b>mgl_get_last_mouse_pos</b><i> (<code>HMGL</code> gr, <code>mreal *</code>x, <code>mreal *</code>y, <code>mreal *</code>z)</i></dt>
<dd><p>Gets last position of mouse click.
</p></dd></dl>


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