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<h2><span class="refentrytitle"><a name="GritsViewer.top_of_page"></a>GritsViewer</span></h2>
<p>GritsViewer — Virtual globe base class</p>
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<a name="GritsViewer.synopsis"></a><h2>Synopsis</h2>
<pre class="synopsis">#define <a class="link" href="GritsViewer.html#GRITS-LEVEL-BACKGROUND:CAPS" title="GRITS_LEVEL_BACKGROUND">GRITS_LEVEL_BACKGROUND</a>
#define <a class="link" href="GritsViewer.html#GRITS-LEVEL-HUD:CAPS" title="GRITS_LEVEL_HUD">GRITS_LEVEL_HUD</a>
#define <a class="link" href="GritsViewer.html#GRITS-LEVEL-OVERLAY:CAPS" title="GRITS_LEVEL_OVERLAY">GRITS_LEVEL_OVERLAY</a>
#define <a class="link" href="GritsViewer.html#GRITS-LEVEL-WORLD:CAPS" title="GRITS_LEVEL_WORLD">GRITS_LEVEL_WORLD</a>
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="returnvalue">gdouble</span></a> (<a class="link" href="GritsViewer.html#GritsHeightFunc" title="GritsHeightFunc ()">*GritsHeightFunc</a>) (<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> lat</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> lon</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data</code></em>);
enum <a class="link" href="GritsViewer.html#GritsProj" title="enum GritsProj">GritsProj</a>;
struct <a class="link" href="GritsViewer.html#GritsViewer-struct" title="struct GritsViewer">GritsViewer</a>;
struct <a class="link" href="GritsViewer.html#GritsViewerClass" title="struct GritsViewerClass">GritsViewerClass</a>;
<span class="returnvalue">void</span> <a class="link" href="GritsViewer.html#grits-viewer-add" title="grits_viewer_add ()">grits_viewer_add</a> (<em class="parameter"><code><a class="link" href="GritsViewer.html" title="GritsViewer"><span class="type">GritsViewer</span></a> *viewer</code></em>,
<em class="parameter"><code><a class="link" href="GritsObject.html" title="GritsObject"><span class="type">GritsObject</span></a> *object</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a> level</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> sort</code></em>);
<span class="returnvalue">void</span> <a class="link" href="GritsViewer.html#grits-viewer-center-position" title="grits_viewer_center_position ()">grits_viewer_center_position</a> (<em class="parameter"><code><a class="link" href="GritsViewer.html" title="GritsViewer"><span class="type">GritsViewer</span></a> *viewer</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> lat</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> lon</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> elev</code></em>);
<span class="returnvalue">void</span> <a class="link" href="GritsViewer.html#grits-viewer-clear-height-func" title="grits_viewer_clear_height_func ()">grits_viewer_clear_height_func</a> (<em class="parameter"><code><a class="link" href="GritsViewer.html" title="GritsViewer"><span class="type">GritsViewer</span></a> *viewer</code></em>);
<span class="returnvalue">void</span> <a class="link" href="GritsViewer.html#grits-viewer-get-location" title="grits_viewer_get_location ()">grits_viewer_get_location</a> (<em class="parameter"><code><a class="link" href="GritsViewer.html" title="GritsViewer"><span class="type">GritsViewer</span></a> *viewer</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> *lat</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> *lon</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> *elev</code></em>);
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> <a class="link" href="GritsViewer.html#grits-viewer-get-offline" title="grits_viewer_get_offline ()">grits_viewer_get_offline</a> (<em class="parameter"><code><a class="link" href="GritsViewer.html" title="GritsViewer"><span class="type">GritsViewer</span></a> *viewer</code></em>);
<span class="returnvalue">void</span> <a class="link" href="GritsViewer.html#grits-viewer-get-rotation" title="grits_viewer_get_rotation ()">grits_viewer_get_rotation</a> (<em class="parameter"><code><a class="link" href="GritsViewer.html" title="GritsViewer"><span class="type">GritsViewer</span></a> *viewer</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> *x</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> *y</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> *z</code></em>);
<span class="returnvalue">time_t</span> <a class="link" href="GritsViewer.html#grits-viewer-get-time" title="grits_viewer_get_time ()">grits_viewer_get_time</a> (<em class="parameter"><code><a class="link" href="GritsViewer.html" title="GritsViewer"><span class="type">GritsViewer</span></a> *viewer</code></em>);
<span class="returnvalue">void</span> <a class="link" href="GritsViewer.html#grits-viewer-pan" title="grits_viewer_pan ()">grits_viewer_pan</a> (<em class="parameter"><code><a class="link" href="GritsViewer.html" title="GritsViewer"><span class="type">GritsViewer</span></a> *viewer</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> forward</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> right</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> up</code></em>);
<span class="returnvalue">void</span> <a class="link" href="GritsViewer.html#grits-viewer-project" title="grits_viewer_project ()">grits_viewer_project</a> (<em class="parameter"><code><a class="link" href="GritsViewer.html" title="GritsViewer"><span class="type">GritsViewer</span></a> *viewer</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> lat</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> lon</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> elev</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> *px</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> *py</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> *pz</code></em>);
<span class="returnvalue">void</span> <a class="link" href="GritsViewer.html#grits-viewer-queue-draw" title="grits_viewer_queue_draw ()">grits_viewer_queue_draw</a> (<em class="parameter"><code><a class="link" href="GritsViewer.html" title="GritsViewer"><span class="type">GritsViewer</span></a> *viewer</code></em>);
<span class="returnvalue">void</span> <a class="link" href="GritsViewer.html#grits-viewer-refresh" title="grits_viewer_refresh ()">grits_viewer_refresh</a> (<em class="parameter"><code><a class="link" href="GritsViewer.html" title="GritsViewer"><span class="type">GritsViewer</span></a> *viewer</code></em>);
<span class="returnvalue">void</span> <a class="link" href="GritsViewer.html#grits-viewer-remove" title="grits_viewer_remove ()">grits_viewer_remove</a> (<em class="parameter"><code><a class="link" href="GritsViewer.html" title="GritsViewer"><span class="type">GritsViewer</span></a> *viewer</code></em>,
<em class="parameter"><code><a class="link" href="GritsObject.html" title="GritsObject"><span class="type">GritsObject</span></a> *object</code></em>);
<span class="returnvalue">void</span> <a class="link" href="GritsViewer.html#grits-viewer-rotate" title="grits_viewer_rotate ()">grits_viewer_rotate</a> (<em class="parameter"><code><a class="link" href="GritsViewer.html" title="GritsViewer"><span class="type">GritsViewer</span></a> *viewer</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> x</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> y</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> z</code></em>);
<span class="returnvalue">void</span> <a class="link" href="GritsViewer.html#grits-viewer-set-height-func" title="grits_viewer_set_height_func ()">grits_viewer_set_height_func</a> (<em class="parameter"><code><a class="link" href="GritsViewer.html" title="GritsViewer"><span class="type">GritsViewer</span></a> *viewer</code></em>,
<em class="parameter"><code><a class="link" href="grits-grits-util.html#GritsBounds" title="struct GritsBounds"><span class="type">GritsBounds</span></a> *bounds</code></em>,
<em class="parameter"><code><a class="link" href="GritsViewer.html#GritsHeightFunc" title="GritsHeightFunc ()"><span class="type">GritsHeightFunc</span></a> height_func</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> update</code></em>);
<span class="returnvalue">void</span> <a class="link" href="GritsViewer.html#grits-viewer-set-location" title="grits_viewer_set_location ()">grits_viewer_set_location</a> (<em class="parameter"><code><a class="link" href="GritsViewer.html" title="GritsViewer"><span class="type">GritsViewer</span></a> *viewer</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> lat</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> lon</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> elev</code></em>);
<span class="returnvalue">void</span> <a class="link" href="GritsViewer.html#grits-viewer-set-offline" title="grits_viewer_set_offline ()">grits_viewer_set_offline</a> (<em class="parameter"><code><a class="link" href="GritsViewer.html" title="GritsViewer"><span class="type">GritsViewer</span></a> *viewer</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> offline</code></em>);
<span class="returnvalue">void</span> <a class="link" href="GritsViewer.html#grits-viewer-set-rotation" title="grits_viewer_set_rotation ()">grits_viewer_set_rotation</a> (<em class="parameter"><code><a class="link" href="GritsViewer.html" title="GritsViewer"><span class="type">GritsViewer</span></a> *viewer</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> x</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> y</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> z</code></em>);
<span class="returnvalue">void</span> <a class="link" href="GritsViewer.html#grits-viewer-set-time" title="grits_viewer_set_time ()">grits_viewer_set_time</a> (<em class="parameter"><code><a class="link" href="GritsViewer.html" title="GritsViewer"><span class="type">GritsViewer</span></a> *viewer</code></em>,
<em class="parameter"><code><span class="type">time_t</span> time</code></em>);
<span class="returnvalue">void</span> <a class="link" href="GritsViewer.html#grits-viewer-setup" title="grits_viewer_setup ()">grits_viewer_setup</a> (<em class="parameter"><code><a class="link" href="GritsViewer.html" title="GritsViewer"><span class="type">GritsViewer</span></a> *viewer</code></em>,
<em class="parameter"><code><a class="link" href="grits-GritsPlugin.html#GritsPlugins" title="struct GritsPlugins"><span class="type">GritsPlugins</span></a> *plugins</code></em>,
<em class="parameter"><code><a class="link" href="GritsPrefs.html" title="GritsPrefs"><span class="type">GritsPrefs</span></a> *prefs</code></em>);
<span class="returnvalue">void</span> <a class="link" href="GritsViewer.html#grits-viewer-unproject" title="grits_viewer_unproject ()">grits_viewer_unproject</a> (<em class="parameter"><code><a class="link" href="GritsViewer.html" title="GritsViewer"><span class="type">GritsViewer</span></a> *viewer</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> px</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> py</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> pz</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> *lat</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> *lon</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> *elev</code></em>);
<span class="returnvalue">void</span> <a class="link" href="GritsViewer.html#grits-viewer-zoom" title="grits_viewer_zoom ()">grits_viewer_zoom</a> (<em class="parameter"><code><a class="link" href="GritsViewer.html" title="GritsViewer"><span class="type">GritsViewer</span></a> *viewer</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> scale</code></em>);
</pre>
</div>
<div class="refsect1">
<a name="GritsViewer.object-hierarchy"></a><h2>Object Hierarchy</h2>
<pre class="synopsis">
<a href="http://library.gnome.org/devel/gobject/unstable/gobject-The-Base-Object-Type.html#GObject">GObject</a>
+----<a href="http://library.gnome.org/devel/gobject/unstable/gobject-The-Base-Object-Type.html#GInitiallyUnowned">GInitiallyUnowned</a>
+----<a href="http://library.gnome.org/devel/gtk3/GtkObject.html">GtkObject</a>
+----<a href="http://developer.gnome.org/gtk/GtkWidget.html">GtkWidget</a>
+----<a href="http://developer.gnome.org/gtk/GtkDrawingArea.html">GtkDrawingArea</a>
+----GritsViewer
+----<a class="link" href="GritsOpenGL.html" title="GritsOpenGL">GritsOpenGL</a>
</pre>
</div>
<div class="refsect1">
<a name="GritsViewer.implemented-interfaces"></a><h2>Implemented Interfaces</h2>
<p>
GritsViewer implements
AtkImplementorIface and <a href="http://developer.gnome.org/gtk/GtkBuildable.html">GtkBuildable</a>.</p>
</div>
<div class="refsect1">
<a name="GritsViewer.signals"></a><h2>Signals</h2>
<pre class="synopsis">
"<a class="link" href="GritsViewer.html#GritsViewer-location-changed" title='The "location-changed" signal'>location-changed</a>" : <a href="http://library.gnome.org/devel/gobject/unstable/gobject-Signals.html#G-SIGNAL-RUN-LAST:CAPS"><code class="literal">Run Last</code></a>
"<a class="link" href="GritsViewer.html#GritsViewer-offline" title='The "offline" signal'>offline</a>" : <a href="http://library.gnome.org/devel/gobject/unstable/gobject-Signals.html#G-SIGNAL-RUN-LAST:CAPS"><code class="literal">Run Last</code></a>
"<a class="link" href="GritsViewer.html#GritsViewer-refresh" title='The "refresh" signal'>refresh</a>" : <a href="http://library.gnome.org/devel/gobject/unstable/gobject-Signals.html#G-SIGNAL-RUN-LAST:CAPS"><code class="literal">Run Last</code></a>
"<a class="link" href="GritsViewer.html#GritsViewer-rotation-changed" title='The "rotation-changed" signal'>rotation-changed</a>" : <a href="http://library.gnome.org/devel/gobject/unstable/gobject-Signals.html#G-SIGNAL-RUN-LAST:CAPS"><code class="literal">Run Last</code></a>
"<a class="link" href="GritsViewer.html#GritsViewer-time-changed" title='The "time-changed" signal'>time-changed</a>" : <a href="http://library.gnome.org/devel/gobject/unstable/gobject-Signals.html#G-SIGNAL-RUN-LAST:CAPS"><code class="literal">Run Last</code></a>
</pre>
</div>
<div class="refsect1">
<a name="GritsViewer.description"></a><h2>Description</h2>
<p>
<a class="link" href="GritsViewer.html" title="GritsViewer"><span class="type">GritsViewer</span></a> is the base class for the virtual globe widget. It handles
everything not directly related to drawing the globe. Plugins and
applications using the viewer should normally talk to the viewer and not care
how it is implemented.
</p>
</div>
<div class="refsect1">
<a name="GritsViewer.details"></a><h2>Details</h2>
<div class="refsect2">
<a name="GRITS-LEVEL-BACKGROUND:CAPS"></a><h3>GRITS_LEVEL_BACKGROUND</h3>
<pre class="programlisting">#define GRITS_LEVEL_BACKGROUND -100
</pre>
<p>
The level used to draw background objects (stars, atmosphere, etc).
</p>
</div>
<hr>
<div class="refsect2">
<a name="GRITS-LEVEL-HUD:CAPS"></a><h3>GRITS_LEVEL_HUD</h3>
<pre class="programlisting">#define GRITS_LEVEL_HUD 200
</pre>
<p>
The level used to draw the Heads Up Display. This is for things that are not
anchored at all the the world. They should be drawn in front of everything
else.
</p>
</div>
<hr>
<div class="refsect2">
<a name="GRITS-LEVEL-OVERLAY:CAPS"></a><h3>GRITS_LEVEL_OVERLAY</h3>
<pre class="programlisting">#define GRITS_LEVEL_OVERLAY 100
</pre>
<p>
The level used to draw screen overlays. These will be drawn in front of most
of ther objects. Text and markers should use <a class="link" href="GritsViewer.html#GRITS-LEVEL-OVERLAY:CAPS" title="GRITS_LEVEL_OVERLAY"><code class="literal">GRITS_LEVEL_OVERLAY</code></a>.
</p>
</div>
<hr>
<div class="refsect2">
<a name="GRITS-LEVEL-WORLD:CAPS"></a><h3>GRITS_LEVEL_WORLD</h3>
<pre class="programlisting">#define GRITS_LEVEL_WORLD 0
</pre>
<p>
The level used to draw world objects. This is for both surface data as well
as things in the air or underground. Most objects should use
<a class="link" href="GritsViewer.html#GRITS-LEVEL-WORLD:CAPS" title="GRITS_LEVEL_WORLD"><code class="literal">GRITS_LEVEL_WORLD</code></a>;
</p>
</div>
<hr>
<div class="refsect2">
<a name="GritsHeightFunc"></a><h3>GritsHeightFunc ()</h3>
<pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="returnvalue">gdouble</span></a> (*GritsHeightFunc) (<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> lat</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> lon</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data</code></em>);</pre>
<p>
Determine the surface elevation (ground level) at a given point.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>lat</code></em> :</span></p></td>
<td>the target latitude</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>lon</code></em> :</span></p></td>
<td>the target longitude</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>user_data</code></em> :</span></p></td>
<td>user data passed to the function</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the elevation in meters above sea level</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GritsProj"></a><h3>enum GritsProj</h3>
<pre class="programlisting">typedef enum {
GRITS_PROJ_LATLON,
GRITS_PROJ_MERCATOR,
} GritsProj;
</pre>
<p>
</p>
</div>
<hr>
<div class="refsect2">
<a name="GritsViewer-struct"></a><h3>struct GritsViewer</h3>
<pre class="programlisting">struct GritsViewer;</pre>
<p>
</p>
</div>
<hr>
<div class="refsect2">
<a name="GritsViewerClass"></a><h3>struct GritsViewerClass</h3>
<pre class="programlisting">struct GritsViewerClass {
GtkDrawingAreaClass parent_class;
/* class members */
void (*center_position) (GritsViewer *viewer,
gdouble lat, gdouble lon, gdouble elev);
void (*project) (GritsViewer *viewer,
gdouble lat, gdouble lon, gdouble elev,
gdouble *px, gdouble *py, gdouble *pz);
void (*unproject) (GritsViewer *viewer,
gdouble px, gdouble py,gdouble pz,
gdouble *lat, gdouble *lon, gdouble *elev);
void (*clear_height_func)(GritsViewer *viewer);
void (*set_height_func) (GritsViewer *viewer, GritsBounds *bounds,
GritsHeightFunc height_func, gpointer user_data,
gboolean update);
void (*add) (GritsViewer *viewer, GritsObject *object,
gint level, gboolean sort);
void (*remove) (GritsViewer *viewer, GritsObject *object);
};
</pre>
<p>
</p>
</div>
<hr>
<div class="refsect2">
<a name="grits-viewer-add"></a><h3>grits_viewer_add ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> grits_viewer_add (<em class="parameter"><code><a class="link" href="GritsViewer.html" title="GritsViewer"><span class="type">GritsViewer</span></a> *viewer</code></em>,
<em class="parameter"><code><a class="link" href="GritsObject.html" title="GritsObject"><span class="type">GritsObject</span></a> *object</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a> level</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> sort</code></em>);</pre>
<p>
Objects which are added to the viewer will be drawn on subsequent renderings
if their level of details is adequate.
</p>
<p>
The <em class="parameter"><code>level</code></em> represents the order the object should be drawn in, this is
unrelated to the objects actual position in the world.
</p>
<p>
Semi-transparent objects should set <em class="parameter"><code>sort</code></em> to <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> so that they are rendered
correctly when they overlap other semi-transparent objects.
</p>
<p>
The viewer steals the objects reference. Call g_object_ref if you plan on
holding a reference as well.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>viewer</code></em> :</span></p></td>
<td>the viewer</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>object</code></em> :</span></p></td>
<td>the object to add</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>level</code></em> :</span></p></td>
<td>the level to add the object to</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>sort</code></em> :</span></p></td>
<td>
<a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if the object should be depth-sorted prior to being drawn</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="grits-viewer-center-position"></a><h3>grits_viewer_center_position ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> grits_viewer_center_position (<em class="parameter"><code><a class="link" href="GritsViewer.html" title="GritsViewer"><span class="type">GritsViewer</span></a> *viewer</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> lat</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> lon</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> elev</code></em>);</pre>
<p>
Center the viewer on a point. This can be used before drawing operations to
center the items a particular location.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>viewer</code></em> :</span></p></td>
<td>the viewer</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>lat</code></em> :</span></p></td>
<td>the latitude</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>lon</code></em> :</span></p></td>
<td>the longitude</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>elev</code></em> :</span></p></td>
<td>the elevation</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="grits-viewer-clear-height-func"></a><h3>grits_viewer_clear_height_func ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> grits_viewer_clear_height_func (<em class="parameter"><code><a class="link" href="GritsViewer.html" title="GritsViewer"><span class="type">GritsViewer</span></a> *viewer</code></em>);</pre>
<p>
Clears the height function for the entire viewer. Useful when an elevation
plugin is unloaded.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>viewer</code></em> :</span></p></td>
<td>the viewer</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="grits-viewer-get-location"></a><h3>grits_viewer_get_location ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> grits_viewer_get_location (<em class="parameter"><code><a class="link" href="GritsViewer.html" title="GritsViewer"><span class="type">GritsViewer</span></a> *viewer</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> *lat</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> *lon</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> *elev</code></em>);</pre>
<p>
Get the location of the camera
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>viewer</code></em> :</span></p></td>
<td>the viewer</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>lat</code></em> :</span></p></td>
<td>the location to store the latitude</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>lon</code></em> :</span></p></td>
<td>the location to store the longitude</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>elev</code></em> :</span></p></td>
<td>the location to store the elevation</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="grits-viewer-get-offline"></a><h3>grits_viewer_get_offline ()</h3>
<pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> grits_viewer_get_offline (<em class="parameter"><code><a class="link" href="GritsViewer.html" title="GritsViewer"><span class="type">GritsViewer</span></a> *viewer</code></em>);</pre>
<p>
Check if the viewer is in offline mode.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>viewer</code></em> :</span></p></td>
<td>the viewer</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>
<a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if the viewer is in offline mode.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="grits-viewer-get-rotation"></a><h3>grits_viewer_get_rotation ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> grits_viewer_get_rotation (<em class="parameter"><code><a class="link" href="GritsViewer.html" title="GritsViewer"><span class="type">GritsViewer</span></a> *viewer</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> *x</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> *y</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> *z</code></em>);</pre>
<p>
Get the rotations in degrees around the x, y, and z axes.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>viewer</code></em> :</span></p></td>
<td>the viewer</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>x</code></em> :</span></p></td>
<td>rotation around the x axes</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>y</code></em> :</span></p></td>
<td>rotation around the y axes</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>z</code></em> :</span></p></td>
<td>rotation around the z axes</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="grits-viewer-get-time"></a><h3>grits_viewer_get_time ()</h3>
<pre class="programlisting"><span class="returnvalue">time_t</span> grits_viewer_get_time (<em class="parameter"><code><a class="link" href="GritsViewer.html" title="GritsViewer"><span class="type">GritsViewer</span></a> *viewer</code></em>);</pre>
<p>
Get the time that is being viewed
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>viewer</code></em> :</span></p></td>
<td>the viewer</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the current time</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="grits-viewer-pan"></a><h3>grits_viewer_pan ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> grits_viewer_pan (<em class="parameter"><code><a class="link" href="GritsViewer.html" title="GritsViewer"><span class="type">GritsViewer</span></a> *viewer</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> forward</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> right</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> up</code></em>);</pre>
<p>
Pan the location by a number of meters long the surface.
</p>
<p>
Bugs: the distances are not in meters
Bugs: panning does not move in strait lines
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>viewer</code></em> :</span></p></td>
<td>the viewer</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>forward</code></em> :</span></p></td>
<td>distance to move forward in meters</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>right</code></em> :</span></p></td>
<td>distance to move right in meters</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>up</code></em> :</span></p></td>
<td>distance to move up in meters</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="grits-viewer-project"></a><h3>grits_viewer_project ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> grits_viewer_project (<em class="parameter"><code><a class="link" href="GritsViewer.html" title="GritsViewer"><span class="type">GritsViewer</span></a> *viewer</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> lat</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> lon</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> elev</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> *px</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> *py</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> *pz</code></em>);</pre>
<p>
Project a latitude, longitude, elevation point to to x, y, and z coordinates
in screen space. Useful for drawing orthographic data over a particular point
in space. E.g. <a class="link" href="GritsMarker.html" title="GritsMarker"><span class="type">GritsMarker</span></a>.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>viewer</code></em> :</span></p></td>
<td>the viewer</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>lat</code></em> :</span></p></td>
<td>the latitude</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>lon</code></em> :</span></p></td>
<td>the longitude</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>elev</code></em> :</span></p></td>
<td>the elevation</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>px</code></em> :</span></p></td>
<td>the project x coordinate</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>py</code></em> :</span></p></td>
<td>the project y coordinate</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>pz</code></em> :</span></p></td>
<td>the project z coordinate</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="grits-viewer-queue-draw"></a><h3>grits_viewer_queue_draw ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> grits_viewer_queue_draw (<em class="parameter"><code><a class="link" href="GritsViewer.html" title="GritsViewer"><span class="type">GritsViewer</span></a> *viewer</code></em>);</pre>
<p>
Causes the viewer to redraw the screen. This has the safe effect as
gtk_widget_queue_draw, but is thread safe, and probably faster.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>viewer</code></em> :</span></p></td>
<td>the viewer</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="grits-viewer-refresh"></a><h3>grits_viewer_refresh ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> grits_viewer_refresh (<em class="parameter"><code><a class="link" href="GritsViewer.html" title="GritsViewer"><span class="type">GritsViewer</span></a> *viewer</code></em>);</pre>
<p>
Trigger the refresh signal. This will cause any remote data to be checked for
updates.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>viewer</code></em> :</span></p></td>
<td>the viewer</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="grits-viewer-remove"></a><h3>grits_viewer_remove ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> grits_viewer_remove (<em class="parameter"><code><a class="link" href="GritsViewer.html" title="GritsViewer"><span class="type">GritsViewer</span></a> *viewer</code></em>,
<em class="parameter"><code><a class="link" href="GritsObject.html" title="GritsObject"><span class="type">GritsObject</span></a> *object</code></em>);</pre>
<p>
Remove an object from the viewer.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>viewer</code></em> :</span></p></td>
<td>the viewer</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>object</code></em> :</span></p></td>
<td>the object to remove</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="grits-viewer-rotate"></a><h3>grits_viewer_rotate ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> grits_viewer_rotate (<em class="parameter"><code><a class="link" href="GritsViewer.html" title="GritsViewer"><span class="type">GritsViewer</span></a> *viewer</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> x</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> y</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> z</code></em>);</pre>
<p>
Add to the rotation around the x, y, and z axes.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>viewer</code></em> :</span></p></td>
<td>the viewer</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>x</code></em> :</span></p></td>
<td>rotation around the x axes</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>y</code></em> :</span></p></td>
<td>rotation around the y axes</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>z</code></em> :</span></p></td>
<td>rotation around the z axes</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="grits-viewer-set-height-func"></a><h3>grits_viewer_set_height_func ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> grits_viewer_set_height_func (<em class="parameter"><code><a class="link" href="GritsViewer.html" title="GritsViewer"><span class="type">GritsViewer</span></a> *viewer</code></em>,
<em class="parameter"><code><a class="link" href="grits-grits-util.html#GritsBounds" title="struct GritsBounds"><span class="type">GritsBounds</span></a> *bounds</code></em>,
<em class="parameter"><code><a class="link" href="GritsViewer.html#GritsHeightFunc" title="GritsHeightFunc ()"><span class="type">GritsHeightFunc</span></a> height_func</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> update</code></em>);</pre>
<p>
Set the height function to be used for a given part of the surface..
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>viewer</code></em> :</span></p></td>
<td>the viewer</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>bounds</code></em> :</span></p></td>
<td>the area to set the height function for</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>height_func</code></em> :</span></p></td>
<td>the height function</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>user_data</code></em> :</span></p></td>
<td>user data to pass to the height function</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>update</code></em> :</span></p></td>
<td>
<a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if the heights inside the bounds should be updated.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="grits-viewer-set-location"></a><h3>grits_viewer_set_location ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> grits_viewer_set_location (<em class="parameter"><code><a class="link" href="GritsViewer.html" title="GritsViewer"><span class="type">GritsViewer</span></a> *viewer</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> lat</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> lon</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> elev</code></em>);</pre>
<p>
Set the location for the camera
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>viewer</code></em> :</span></p></td>
<td>the viewer</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>lat</code></em> :</span></p></td>
<td>the new latitude</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>lon</code></em> :</span></p></td>
<td>the new longitude</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>elev</code></em> :</span></p></td>
<td>the new elevation</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="grits-viewer-set-offline"></a><h3>grits_viewer_set_offline ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> grits_viewer_set_offline (<em class="parameter"><code><a class="link" href="GritsViewer.html" title="GritsViewer"><span class="type">GritsViewer</span></a> *viewer</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> offline</code></em>);</pre>
<p>
Set the offline mode. If <em class="parameter"><code>offline</code></em> is <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a>, only locally cached data will be
used.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>viewer</code></em> :</span></p></td>
<td>the viewer</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>offline</code></em> :</span></p></td>
<td>
<a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> to enter offline mode</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="grits-viewer-set-rotation"></a><h3>grits_viewer_set_rotation ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> grits_viewer_set_rotation (<em class="parameter"><code><a class="link" href="GritsViewer.html" title="GritsViewer"><span class="type">GritsViewer</span></a> *viewer</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> x</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> y</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> z</code></em>);</pre>
<p>
Set the rotations in degrees around the x, y, and z axes.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>viewer</code></em> :</span></p></td>
<td>the viewer</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>x</code></em> :</span></p></td>
<td>rotation new around the x axes</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>y</code></em> :</span></p></td>
<td>rotation new around the y axes</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>z</code></em> :</span></p></td>
<td>rotation new around the z axes</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="grits-viewer-set-time"></a><h3>grits_viewer_set_time ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> grits_viewer_set_time (<em class="parameter"><code><a class="link" href="GritsViewer.html" title="GritsViewer"><span class="type">GritsViewer</span></a> *viewer</code></em>,
<em class="parameter"><code><span class="type">time_t</span> time</code></em>);</pre>
<p>
Set the current time for the view
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>viewer</code></em> :</span></p></td>
<td>the viewer</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>time</code></em> :</span></p></td>
<td>the time to set the view to</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="grits-viewer-setup"></a><h3>grits_viewer_setup ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> grits_viewer_setup (<em class="parameter"><code><a class="link" href="GritsViewer.html" title="GritsViewer"><span class="type">GritsViewer</span></a> *viewer</code></em>,
<em class="parameter"><code><a class="link" href="grits-GritsPlugin.html#GritsPlugins" title="struct GritsPlugins"><span class="type">GritsPlugins</span></a> *plugins</code></em>,
<em class="parameter"><code><a class="link" href="GritsPrefs.html" title="GritsPrefs"><span class="type">GritsPrefs</span></a> *prefs</code></em>);</pre>
<p>
This should be called by objects which implement GritsViewer somewhere in their
constructor.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>viewer</code></em> :</span></p></td>
<td>the viewer</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>plugins</code></em> :</span></p></td>
<td>a plugins store</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>prefs</code></em> :</span></p></td>
<td>a prefs store</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="grits-viewer-unproject"></a><h3>grits_viewer_unproject ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> grits_viewer_unproject (<em class="parameter"><code><a class="link" href="GritsViewer.html" title="GritsViewer"><span class="type">GritsViewer</span></a> *viewer</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> px</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> py</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> pz</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> *lat</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> *lon</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> *elev</code></em>);</pre>
<p>
Project a x, y point in screen space to a latitude, longitude, and elevation
point. Useful for finding the position of the cursor or another on-screen
object in world coordinates.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>viewer</code></em> :</span></p></td>
<td>the viewer</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>lat</code></em> :</span></p></td>
<td>the latitude</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>lon</code></em> :</span></p></td>
<td>the longitude</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>elev</code></em> :</span></p></td>
<td>the elevation</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="grits-viewer-zoom"></a><h3>grits_viewer_zoom ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> grits_viewer_zoom (<em class="parameter"><code><a class="link" href="GritsViewer.html" title="GritsViewer"><span class="type">GritsViewer</span></a> *viewer</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> scale</code></em>);</pre>
<p>
Multiple the elevation by a scale.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>viewer</code></em> :</span></p></td>
<td>the viewer</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>scale</code></em> :</span></p></td>
<td>the scale to multiple the elevation by</td>
</tr>
</tbody>
</table></div>
</div>
</div>
<div class="refsect1">
<a name="GritsViewer.signal-details"></a><h2>Signal Details</h2>
<div class="refsect2">
<a name="GritsViewer-location-changed"></a><h3>The <code class="literal">"location-changed"</code> signal</h3>
<pre class="programlisting"><span class="returnvalue">void</span> user_function (<a class="link" href="GritsViewer.html" title="GritsViewer"><span class="type">GritsViewer</span></a> *viewer,
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> lat,
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> lon,
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> elev,
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data) : <a href="http://library.gnome.org/devel/gobject/unstable/gobject-Signals.html#G-SIGNAL-RUN-LAST:CAPS"><code class="literal">Run Last</code></a></pre>
<p>
The ::location-changed signal is emitted when the viewers camera
location changes.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>viewer</code></em> :</span></p></td>
<td>the viewer.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>lat</code></em> :</span></p></td>
<td>the new latitude.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>lon</code></em> :</span></p></td>
<td>the new longitude.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>elev</code></em> :</span></p></td>
<td>the new elevation.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>user_data</code></em> :</span></p></td>
<td>user data set when the signal handler was connected.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GritsViewer-offline"></a><h3>The <code class="literal">"offline"</code> signal</h3>
<pre class="programlisting"><span class="returnvalue">void</span> user_function (<a class="link" href="GritsViewer.html" title="GritsViewer"><span class="type">GritsViewer</span></a> *viewer,
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> offline,
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data) : <a href="http://library.gnome.org/devel/gobject/unstable/gobject-Signals.html#G-SIGNAL-RUN-LAST:CAPS"><code class="literal">Run Last</code></a></pre>
<p>
The ::offline signal is emitted when the viewers offline mode
changes.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>viewer</code></em> :</span></p></td>
<td>the viewer.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>offline</code></em> :</span></p></td>
<td>
<a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if the viewer going offline.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>user_data</code></em> :</span></p></td>
<td>user data set when the signal handler was connected.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GritsViewer-refresh"></a><h3>The <code class="literal">"refresh"</code> signal</h3>
<pre class="programlisting"><span class="returnvalue">void</span> user_function (<a class="link" href="GritsViewer.html" title="GritsViewer"><span class="type">GritsViewer</span></a> *viewer,
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data) : <a href="http://library.gnome.org/devel/gobject/unstable/gobject-Signals.html#G-SIGNAL-RUN-LAST:CAPS"><code class="literal">Run Last</code></a></pre>
<p>
The ::refresh signal is emitted when a refresh is needed. If you are
using real-time data from a remote server, you should connect to the
refresh signal and update the data when necessary.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>viewer</code></em> :</span></p></td>
<td>the viewer.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>user_data</code></em> :</span></p></td>
<td>user data set when the signal handler was connected.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GritsViewer-rotation-changed"></a><h3>The <code class="literal">"rotation-changed"</code> signal</h3>
<pre class="programlisting"><span class="returnvalue">void</span> user_function (<a class="link" href="GritsViewer.html" title="GritsViewer"><span class="type">GritsViewer</span></a> *viewer,
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> x,
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> y,
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> z,
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data) : <a href="http://library.gnome.org/devel/gobject/unstable/gobject-Signals.html#G-SIGNAL-RUN-LAST:CAPS"><code class="literal">Run Last</code></a></pre>
<p>
The ::rotation-changed signal is emitted when the viewers cameras
rotation changes.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>viewer</code></em> :</span></p></td>
<td>the viewer.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>x</code></em> :</span></p></td>
<td>rotation new around the x axes.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>y</code></em> :</span></p></td>
<td>rotation new around the y axes.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>z</code></em> :</span></p></td>
<td>rotation new around the z axes.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>user_data</code></em> :</span></p></td>
<td>user data set when the signal handler was connected.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GritsViewer-time-changed"></a><h3>The <code class="literal">"time-changed"</code> signal</h3>
<pre class="programlisting"><span class="returnvalue">void</span> user_function (<a class="link" href="GritsViewer.html" title="GritsViewer"><span class="type">GritsViewer</span></a> *viewer,
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#glong"><span class="type">glong</span></a> time,
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data) : <a href="http://library.gnome.org/devel/gobject/unstable/gobject-Signals.html#G-SIGNAL-RUN-LAST:CAPS"><code class="literal">Run Last</code></a></pre>
<p>
The ::time-changed signal is emitted when the viewers current time
changers.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>viewer</code></em> :</span></p></td>
<td>the viewer.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>time</code></em> :</span></p></td>
<td>the new time.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>user_data</code></em> :</span></p></td>
<td>user data set when the signal handler was connected.</td>
</tr>
</tbody>
</table></div>
</div>
</div>
</div>
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