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<div class="refentry">
<a name="GritsTile"></a><div class="titlepage"></div>
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<h2><span class="refentrytitle"><a name="GritsTile.top_of_page"></a>GritsTile</span></h2>
<p>GritsTile — Latitude/longitude overlays</p>
</td>
<td valign="top" align="right"></td>
</tr></table></div>
<div class="refsynopsisdiv">
<a name="GritsTile.synopsis"></a><h2>Synopsis</h2>
<pre class="synopsis">struct <a class="link" href="GritsTile.html#GritsTile-struct" title="struct GritsTile">GritsTile</a>;
struct <a class="link" href="GritsTile.html#GritsTileClass" title="struct GritsTileClass">GritsTileClass</a>;
<span class="returnvalue">void</span> (<a class="link" href="GritsTile.html#GritsTileFreeFunc" title="GritsTileFreeFunc ()">*GritsTileFreeFunc</a>) (<em class="parameter"><code><a class="link" href="GritsTile.html" title="GritsTile"><span class="type">GritsTile</span></a> *tile</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>);
<span class="returnvalue">void</span> (<a class="link" href="GritsTile.html#GritsTileLoadFunc" title="GritsTileLoadFunc ()">*GritsTileLoadFunc</a>) (<em class="parameter"><code><a class="link" href="GritsTile.html" title="GritsTile"><span class="type">GritsTile</span></a> *tile</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>);
<a class="link" href="GritsTile.html" title="GritsTile"><span class="returnvalue">GritsTile</span></a> * <a class="link" href="GritsTile.html#grits-tile-find" title="grits_tile_find ()">grits_tile_find</a> (<em class="parameter"><code><a class="link" href="GritsTile.html" title="GritsTile"><span class="type">GritsTile</span></a> *root</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>);
#define <a class="link" href="GritsTile.html#grits-tile-foreach" title="grits_tile_foreach()">grits_tile_foreach</a> (parent,
child)
#define <a class="link" href="GritsTile.html#grits-tile-foreach-index" title="grits_tile_foreach_index()">grits_tile_foreach_index</a> (parent,
x,
y)
<span class="returnvalue">void</span> <a class="link" href="GritsTile.html#grits-tile-free" title="grits_tile_free ()">grits_tile_free</a> (<em class="parameter"><code><a class="link" href="GritsTile.html" title="GritsTile"><span class="type">GritsTile</span></a> *root</code></em>,
<em class="parameter"><code><a class="link" href="GritsTile.html#GritsTileFreeFunc" title="GritsTileFreeFunc ()"><span class="type">GritsTileFreeFunc</span></a> free_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>);
<a class="link" href="GritsTile.html" title="GritsTile"><span class="returnvalue">GritsTile</span></a> * <a class="link" href="GritsTile.html#grits-tile-gc" title="grits_tile_gc ()">grits_tile_gc</a> (<em class="parameter"><code><a class="link" href="GritsTile.html" title="GritsTile"><span class="type">GritsTile</span></a> *root</code></em>,
<em class="parameter"><code><span class="type">time_t</span> atime</code></em>,
<em class="parameter"><code><a class="link" href="GritsTile.html#GritsTileFreeFunc" title="GritsTileFreeFunc ()"><span class="type">GritsTileFreeFunc</span></a> free_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>);
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="returnvalue">gchar</span></a> * <a class="link" href="GritsTile.html#grits-tile-get-path" title="grits_tile_get_path ()">grits_tile_get_path</a> (<em class="parameter"><code><a class="link" href="GritsTile.html" title="GritsTile"><span class="type">GritsTile</span></a> *child</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="GritsTile.html#grits-tile-load-file" title="grits_tile_load_file ()">grits_tile_load_file</a> (<em class="parameter"><code><a class="link" href="GritsTile.html" title="GritsTile"><span class="type">GritsTile</span></a> *tile</code></em>,
<em class="parameter"><code>const <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *file</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="GritsTile.html#grits-tile-load-pixbuf" title="grits_tile_load_pixbuf ()">grits_tile_load_pixbuf</a> (<em class="parameter"><code><a class="link" href="GritsTile.html" title="GritsTile"><span class="type">GritsTile</span></a> *tile</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/gdk-pixbuf/unstable/gdk-pixbuf-The-GdkPixbuf-Structure.html#GdkPixbuf"><span class="type">GdkPixbuf</span></a> *pixbuf</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="GritsTile.html#grits-tile-load-pixels" title="grits_tile_load_pixels ()">grits_tile_load_pixels</a> (<em class="parameter"><code><a class="link" href="GritsTile.html" title="GritsTile"><span class="type">GritsTile</span></a> *tile</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guchar"><span class="type">guchar</span></a> *pixels</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> width</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> height</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> channels</code></em>);
<a class="link" href="GritsTile.html" title="GritsTile"><span class="returnvalue">GritsTile</span></a> * <a class="link" href="GritsTile.html#grits-tile-new" title="grits_tile_new ()">grits_tile_new</a> (<em class="parameter"><code><a class="link" href="GritsTile.html" title="GritsTile"><span class="type">GritsTile</span></a> *parent</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> n</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> s</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> e</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> w</code></em>);
<span class="returnvalue">void</span> <a class="link" href="GritsTile.html#grits-tile-update" title="grits_tile_update ()">grits_tile_update</a> (<em class="parameter"><code><a class="link" href="GritsTile.html" title="GritsTile"><span class="type">GritsTile</span></a> *root</code></em>,
<em class="parameter"><code><a class="link" href="grits-grits-util.html#GritsPoint" title="struct GritsPoint"><span class="type">GritsPoint</span></a> *eye</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> res</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> width</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> height</code></em>,
<em class="parameter"><code><a class="link" href="GritsTile.html#GritsTileLoadFunc" title="GritsTileLoadFunc ()"><span class="type">GritsTileLoadFunc</span></a> load_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>);
</pre>
</div>
<div class="refsect1">
<a name="GritsTile.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 class="link" href="GritsObject.html" title="GritsObject">GritsObject</a>
+----GritsTile
</pre>
</div>
<div class="refsect1">
<a name="GritsTile.description"></a><h2>Description</h2>
<p>
Each <a class="link" href="GritsTile.html" title="GritsTile"><span class="type">GritsTile</span></a> corresponds to a latitude/longitude box on the surface of
the earth. When drawn, the <a class="link" href="GritsTile.html" title="GritsTile"><span class="type">GritsTile</span></a> renders an images associated with it
to the surface of the earth. This is primarily used to draw ground overlays.
</p>
<p>
Each GritsTile can be split into subtiles in order to draw higher resolution
overlays. Pointers to subtitles are stored in the parent tile and a parent
pointer is stored in each child.
</p>
<p>
Each <a class="link" href="GritsTile.html" title="GritsTile"><span class="type">GritsTile</span></a> has a data filed which must be set by the user in order for
the tile to be drawn. When used with GritsOpenGL the data must be an integer
representing the OpenGL texture to use when drawing the tile.
</p>
</div>
<div class="refsect1">
<a name="GritsTile.details"></a><h2>Details</h2>
<div class="refsect2">
<a name="GritsTile-struct"></a><h3>struct GritsTile</h3>
<pre class="programlisting">struct GritsTile;</pre>
<p>
</p>
</div>
<hr>
<div class="refsect2">
<a name="GritsTileClass"></a><h3>struct GritsTileClass</h3>
<pre class="programlisting">struct GritsTileClass {
GritsObjectClass parent_class;
};
</pre>
<p>
</p>
</div>
<hr>
<div class="refsect2">
<a name="GritsTileFreeFunc"></a><h3>GritsTileFreeFunc ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> (*GritsTileFreeFunc) (<em class="parameter"><code><a class="link" href="GritsTile.html" title="GritsTile"><span class="type">GritsTile</span></a> *tile</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>
Used to free the image data associated with a tile
</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>tile</code></em> :</span></p></td>
<td>the tile to free</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>user_data</code></em> :</span></p></td>
<td>data paseed to the function</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GritsTileLoadFunc"></a><h3>GritsTileLoadFunc ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> (*GritsTileLoadFunc) (<em class="parameter"><code><a class="link" href="GritsTile.html" title="GritsTile"><span class="type">GritsTile</span></a> *tile</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>
Used to load the image data associated with a tile. For GritsOpenGL, this
function should store the OpenGL texture number in the tiles data field.
</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>tile</code></em> :</span></p></td>
<td>the tile to load</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>user_data</code></em> :</span></p></td>
<td>data paseed to the function</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="grits-tile-find"></a><h3>grits_tile_find ()</h3>
<pre class="programlisting"><a class="link" href="GritsTile.html" title="GritsTile"><span class="returnvalue">GritsTile</span></a> * grits_tile_find (<em class="parameter"><code><a class="link" href="GritsTile.html" title="GritsTile"><span class="type">GritsTile</span></a> *root</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>);</pre>
<p>
Locate the subtile with the highest resolution which contains the given
lat/lon 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>root</code></em> :</span></p></td>
<td>the root tile to search from</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>lat</code></em> :</span></p></td>
<td>target latitude</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>lon</code></em> :</span></p></td>
<td>target longitude</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the child tile</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="grits-tile-foreach"></a><h3>grits_tile_foreach()</h3>
<pre class="programlisting">#define grits_tile_foreach(parent, child)</pre>
<p>
Iterate over each imediate subtile of <em class="parameter"><code>parent</code></em>.
</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>parent</code></em> :</span></p></td>
<td>the <a class="link" href="GritsTile.html" title="GritsTile"><span class="type">GritsTile</span></a> to iterate over</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>child</code></em> :</span></p></td>
<td>a pointer to a <a class="link" href="GritsTile.html" title="GritsTile"><span class="type">GritsTile</span></a> to store the current subtile</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="grits-tile-foreach-index"></a><h3>grits_tile_foreach_index()</h3>
<pre class="programlisting">#define grits_tile_foreach_index(parent, x, y)</pre>
<p>
Iterate over each imediate subtile of <em class="parameter"><code>parent</code></em>.
</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>parent</code></em> :</span></p></td>
<td>the <a class="link" href="GritsTile.html" title="GritsTile"><span class="type">GritsTile</span></a> to iterate over</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>x</code></em> :</span></p></td>
<td>integer to store the x index of the current subtile</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>y</code></em> :</span></p></td>
<td>integer to store the y index of the current subtile</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="grits-tile-free"></a><h3>grits_tile_free ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> grits_tile_free (<em class="parameter"><code><a class="link" href="GritsTile.html" title="GritsTile"><span class="type">GritsTile</span></a> *root</code></em>,
<em class="parameter"><code><a class="link" href="GritsTile.html#GritsTileFreeFunc" title="GritsTileFreeFunc ()"><span class="type">GritsTileFreeFunc</span></a> free_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>);</pre>
<p>
Recursively free a tile and all it's children.
</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>root</code></em> :</span></p></td>
<td>the root tile to free</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>free_func</code></em> :</span></p></td>
<td>function used to free the image when a new tile is collected</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>user_data</code></em> :</span></p></td>
<td>user data to past to the free function</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="grits-tile-gc"></a><h3>grits_tile_gc ()</h3>
<pre class="programlisting"><a class="link" href="GritsTile.html" title="GritsTile"><span class="returnvalue">GritsTile</span></a> * grits_tile_gc (<em class="parameter"><code><a class="link" href="GritsTile.html" title="GritsTile"><span class="type">GritsTile</span></a> *root</code></em>,
<em class="parameter"><code><span class="type">time_t</span> atime</code></em>,
<em class="parameter"><code><a class="link" href="GritsTile.html#GritsTileFreeFunc" title="GritsTileFreeFunc ()"><span class="type">GritsTileFreeFunc</span></a> free_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>);</pre>
<p>
Garbage collect old tiles. This removes and deallocate tiles that have not
been used since before <em class="parameter"><code>atime</code></em>.
</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>root</code></em> :</span></p></td>
<td>the root tile to start garbage collection at</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>atime</code></em> :</span></p></td>
<td>most recent time at which tiles will be kept</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>free_func</code></em> :</span></p></td>
<td>function used to free the image when a new tile is collected</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>user_data</code></em> :</span></p></td>
<td>user data to past to the free function</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a pointer to the original tile, or NULL if it was garbage collected</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="grits-tile-get-path"></a><h3>grits_tile_get_path ()</h3>
<pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="returnvalue">gchar</span></a> * grits_tile_get_path (<em class="parameter"><code><a class="link" href="GritsTile.html" title="GritsTile"><span class="type">GritsTile</span></a> *child</code></em>);</pre>
<p>
Generate a string representation of a tiles location in a group of nested
tiles. The string returned consists of groups of two digits separated by a
delimiter. Each group of digits the tiles location with respect to it's
parent tile.
</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>child</code></em> :</span></p></td>
<td>the tile to generate a path for</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the path representing the tiles's location</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="grits-tile-load-file"></a><h3>grits_tile_load_file ()</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_tile_load_file (<em class="parameter"><code><a class="link" href="GritsTile.html" title="GritsTile"><span class="type">GritsTile</span></a> *tile</code></em>,
<em class="parameter"><code>const <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *file</code></em>);</pre>
<p>
Load tile data from an image file
This function is thread safe and my be called from outside the main thread.
</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>tile</code></em> :</span></p></td>
<td>the tile to load data into</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>file</code></em> :</span></p></td>
<td>path to an image file to load</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>TRUE if the image was loaded successfully</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="grits-tile-load-pixbuf"></a><h3>grits_tile_load_pixbuf ()</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_tile_load_pixbuf (<em class="parameter"><code><a class="link" href="GritsTile.html" title="GritsTile"><span class="type">GritsTile</span></a> *tile</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/gdk-pixbuf/unstable/gdk-pixbuf-The-GdkPixbuf-Structure.html#GdkPixbuf"><span class="type">GdkPixbuf</span></a> *pixbuf</code></em>);</pre>
<p>
</p>
</div>
<hr>
<div class="refsect2">
<a name="grits-tile-load-pixels"></a><h3>grits_tile_load_pixels ()</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_tile_load_pixels (<em class="parameter"><code><a class="link" href="GritsTile.html" title="GritsTile"><span class="type">GritsTile</span></a> *tile</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guchar"><span class="type">guchar</span></a> *pixels</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> width</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> height</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> channels</code></em>);</pre>
<p>
Load tile data from an in memory pixel buffer.
</p>
<p>
This function is thread safe and my be called from outside the main thread.
</p>
<p>
Ownership of the pixel buffer is passed to the tile, it should not be freed
or modified after calling this function.
</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>tile</code></em> :</span></p></td>
<td>the tile to load data into</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>pixels</code></em> :</span></p></td>
<td>buffered pixel data</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>width</code></em> :</span></p></td>
<td>width of the pixel buffer (in pixels)</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>height</code></em> :</span></p></td>
<td>height of the pixel buffer (in pixels)</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>TRUE if the image was loaded successfully</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="grits-tile-new"></a><h3>grits_tile_new ()</h3>
<pre class="programlisting"><a class="link" href="GritsTile.html" title="GritsTile"><span class="returnvalue">GritsTile</span></a> * grits_tile_new (<em class="parameter"><code><a class="link" href="GritsTile.html" title="GritsTile"><span class="type">GritsTile</span></a> *parent</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> n</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> s</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> e</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> w</code></em>);</pre>
<p>
Create a tile associated with a particular latitude/longitude box.
</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>parent</code></em> :</span></p></td>
<td>the parent for the tile, or NULL</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>n</code></em> :</span></p></td>
<td>the northern border of the tile</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>s</code></em> :</span></p></td>
<td>the southern border of the tile</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>e</code></em> :</span></p></td>
<td>the eastern border of the tile</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>w</code></em> :</span></p></td>
<td>the western border of the tile</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the new <a class="link" href="GritsTile.html" title="GritsTile"><span class="type">GritsTile</span></a>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="grits-tile-update"></a><h3>grits_tile_update ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> grits_tile_update (<em class="parameter"><code><a class="link" href="GritsTile.html" title="GritsTile"><span class="type">GritsTile</span></a> *root</code></em>,
<em class="parameter"><code><a class="link" href="grits-grits-util.html#GritsPoint" title="struct GritsPoint"><span class="type">GritsPoint</span></a> *eye</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> res</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> width</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> height</code></em>,
<em class="parameter"><code><a class="link" href="GritsTile.html#GritsTileLoadFunc" title="GritsTileLoadFunc ()"><span class="type">GritsTileLoadFunc</span></a> load_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>);</pre>
<p>
Recursively split a tile into children of appropriate detail. The resolution
of the tile in pixels per meter is compared to the resolution which the tile
is being drawn at on the screen. If the screen resolution is insufficient
the tile is recursively subdivided until a sufficient resolution is
achieved.
</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>root</code></em> :</span></p></td>
<td>the root tile to split</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>eye</code></em> :</span></p></td>
<td>the point the tile is viewed from, for calculating distances</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>res</code></em> :</span></p></td>
<td>a maximum resolution in meters per pixel to split tiles to</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>width</code></em> :</span></p></td>
<td>width in pixels of the image associated with the tile</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>height</code></em> :</span></p></td>
<td>height in pixels of the image associated with the tile</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>load_func</code></em> :</span></p></td>
<td>function used to load the image when a new tile is created</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>user_data</code></em> :</span></p></td>
<td>user data to past to the load function</td>
</tr>
</tbody>
</table></div>
</div>
</div>
</div>
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