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<?xml version="1.0"?>
<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.1.2//EN"
"http://www.oasis-open.org/docbook/xml/4.1.2/docbookx.dtd">
<refentry id="GypsyPosition">
<refmeta>
<refentrytitle role="top_of_page">GypsyPosition</refentrytitle>
<manvolnum>3</manvolnum>
<refmiscinfo>GYPSY Library</refmiscinfo>
</refmeta>
<refnamediv>
<refname>GypsyPosition</refname>
<refpurpose>Object for obtaining positions from gypsy-daemon</refpurpose>
<!--[<xref linkend="desc" endterm="desc.title"/>]-->
</refnamediv>
<refsynopsisdiv role="synopsis">
<title role="synopsis.title">Synopsis</title>
<synopsis>
<link linkend="GypsyPosition-struct">GypsyPosition</link>;
#define <link linkend="GYPSY-POSITION-DBUS-INTERFACE:CAPS">GYPSY_POSITION_DBUS_INTERFACE</link>
#define <link linkend="GYPSY-POSITION-DBUS-SERVICE:CAPS">GYPSY_POSITION_DBUS_SERVICE</link>
enum <link linkend="GypsyPositionFields">GypsyPositionFields</link>;
<link linkend="GypsyPosition">GypsyPosition</link>* <link linkend="gypsy-position-new">gypsy_position_new</link> (const <link linkend="char">char</link> *object_path);
<link linkend="GypsyPositionFields">GypsyPositionFields</link> <link linkend="gypsy-position-get-position">gypsy_position_get_position</link> (<link linkend="GypsyPosition">GypsyPosition</link> *position,
<link linkend="int">int</link> *timestamp,
<link linkend="double">double</link> *latitude,
<link linkend="double">double</link> *longitude,
<link linkend="double">double</link> *altitude,
<link linkend="GError">GError</link> **error);
</synopsis>
</refsynopsisdiv>
<refsect1 role="object_hierarchy">
<title role="object_hierarchy.title">Object Hierarchy</title>
<synopsis>
<link linkend="GObject">GObject</link>
+----GypsyPosition
</synopsis>
</refsect1>
<refsect1 role="properties">
<title role="properties.title">Properties</title>
<synopsis>
"<link linkend="GypsyPosition--object-path">object-path</link>" <link linkend="gchararray">gchararray</link> : Write / Construct Only
</synopsis>
</refsect1>
<refsect1 role="signal_proto">
<title role="signal_proto.title">Signals</title>
<synopsis>
"<link linkend="GypsyPosition-position-changed">position-changed</link>" : Run First / No Recursion
</synopsis>
</refsect1>
<refsect1 role="desc">
<title role="desc.title">Description</title>
<para>
<link linkend="GypsyPosition"><type>GypsyPosition</type></link> is used whenever the client program wishes to know about
GPS position changes. It can report the current position, and has a signal
to notify listeners of changes.
</para>
<para>
A <link linkend="GypsyPosition"><type>GypsyPosition</type></link> object is created using <link linkend="gypsy-position-new"><function>gypsy_position_new()</function></link> using the
D-Bus path of the GPS device. This path is returned from the
<link linkend="gypsy-control-create"><function>gypsy_control_create()</function></link> function. The client can then find out about the
position with <link linkend="gypsy-position-get-position"><function>gypsy_position_get_position()</function></link>.
</para>
<para>
As the position information changes <link linkend="GypsyPosition"><type>GypsyPosition</type></link> will emit the
position-changed signal. This signal contains the fix position if
gypsy-daemon knows it. It has a fields paramater which is a bitmask of
<link linkend="GypsyPositionFields"><type>GypsyPositionFields</type></link> which indicates which of the latitude, longitude or
altitude contains valid information. The timestamp will always be valid
if it is greater than 0.
</para>
<para>
<informalexample>
<programlisting>
GypsyPosition *position;
GError *error = NULL;
. . .
/ * path comes from the gypsy_control_create() function * /
position = gypsy_position_new (path);
g_signal_connect (position, "position-changed", G_CALLBACK (position_changed), NULL);
. . .
static void position_changed (GypsyPosition *position,
GypsyPositionFields fields,
int timestamp,
double latitude,
double longitude,
double altitude,
gpointer userdata)
{
g_print ("latitude, longitude (%f, %f)\n", (fields & GYPSY_POSITION_FIELDS_LATITUDE) ? latitude : -1.0, (fields & GYPSY_POSITION_FIELDS_LONGITUDE) ? longitude : -1.0);
}
</programlisting>
</informalexample></para>
<para>
</para>
</refsect1>
<refsect1 role="details">
<title role="details.title">Details</title>
<refsect2>
<title><anchor id="GypsyPosition-struct" role="struct"/>GypsyPosition</title>
<indexterm><primary>GypsyPosition</primary></indexterm><programlisting>typedef struct _GypsyPosition GypsyPosition;</programlisting>
<para>
There are no public fields in <link linkend="GypsyPosition"><type>GypsyPosition</type></link>.</para>
<para>
</para></refsect2>
<refsect2>
<title><anchor id="GYPSY-POSITION-DBUS-INTERFACE:CAPS" role="macro"/>GYPSY_POSITION_DBUS_INTERFACE</title>
<indexterm><primary>GYPSY_POSITION_DBUS_INTERFACE</primary></indexterm><programlisting>#define GYPSY_POSITION_DBUS_INTERFACE "org.freedesktop.Gypsy.Position"
</programlisting>
<para>
A define containing the name of the Position interface</para>
<para>
</para></refsect2>
<refsect2>
<title><anchor id="GYPSY-POSITION-DBUS-SERVICE:CAPS" role="macro"/>GYPSY_POSITION_DBUS_SERVICE</title>
<indexterm><primary>GYPSY_POSITION_DBUS_SERVICE</primary></indexterm><programlisting>#define GYPSY_POSITION_DBUS_SERVICE "org.freedesktop.Gypsy"
</programlisting>
<para>
A define containing the address of the Position service</para>
<para>
</para></refsect2>
<refsect2>
<title><anchor id="GypsyPositionFields" role="enum"/>enum GypsyPositionFields</title>
<indexterm><primary>GypsyPositionFields</primary></indexterm><programlisting>typedef enum {
GYPSY_POSITION_FIELDS_NONE = 0,
GYPSY_POSITION_FIELDS_LATITUDE = 1 << 0,
GYPSY_POSITION_FIELDS_LONGITUDE = 1 << 1,
GYPSY_POSITION_FIELDS_ALTITUDE = 1 << 2
} GypsyPositionFields;
</programlisting>
<para>
A bitmask telling which fields in the position_changed callback are valid</para>
<para>
</para><variablelist role="enum">
<varlistentry>
<term><anchor id="GYPSY-POSITION-FIELDS-NONE:CAPS" role="constant"/><literal>GYPSY_POSITION_FIELDS_NONE</literal></term>
<listitem><simpara> None of the fields are valid
</simpara></listitem>
</varlistentry>
<varlistentry>
<term><anchor id="GYPSY-POSITION-FIELDS-LATITUDE:CAPS" role="constant"/><literal>GYPSY_POSITION_FIELDS_LATITUDE</literal></term>
<listitem><simpara> The latitude field is valid
</simpara></listitem>
</varlistentry>
<varlistentry>
<term><anchor id="GYPSY-POSITION-FIELDS-LONGITUDE:CAPS" role="constant"/><literal>GYPSY_POSITION_FIELDS_LONGITUDE</literal></term>
<listitem><simpara> The longitude field is valid
</simpara></listitem>
</varlistentry>
<varlistentry>
<term><anchor id="GYPSY-POSITION-FIELDS-ALTITUDE:CAPS" role="constant"/><literal>GYPSY_POSITION_FIELDS_ALTITUDE</literal></term>
<listitem><simpara> The altitude field is valid
</simpara></listitem>
</varlistentry>
</variablelist></refsect2>
<refsect2>
<title><anchor id="gypsy-position-new" role="function"/>gypsy_position_new ()</title>
<indexterm><primary>gypsy_position_new</primary></indexterm><programlisting><link linkend="GypsyPosition">GypsyPosition</link>* gypsy_position_new (const <link linkend="char">char</link> *object_path);</programlisting>
<para>
Creates a new <link linkend="GypsyPosition"><type>GypsyPosition</type></link> object that listens for position changes
from the GPS found at <parameter>object_path</parameter>.</para>
<para>
</para><variablelist role="params">
<varlistentry><term><parameter>object_path</parameter> :</term>
<listitem><simpara> Object path to the GPS device
</simpara></listitem></varlistentry>
<varlistentry><term><emphasis>Returns</emphasis> :</term><listitem><simpara> A <link linkend="GypsyPosition"><type>GypsyPosition</type></link> object
</simpara></listitem></varlistentry>
</variablelist></refsect2>
<refsect2>
<title><anchor id="gypsy-position-get-position" role="function"/>gypsy_position_get_position ()</title>
<indexterm><primary>gypsy_position_get_position</primary></indexterm><programlisting><link linkend="GypsyPositionFields">GypsyPositionFields</link> gypsy_position_get_position (<link linkend="GypsyPosition">GypsyPosition</link> *position,
<link linkend="int">int</link> *timestamp,
<link linkend="double">double</link> *latitude,
<link linkend="double">double</link> *longitude,
<link linkend="double">double</link> *altitude,
<link linkend="GError">GError</link> **error);</programlisting>
<para>
Obtains the current position, if known, from the GPS device.
<parameter>timestamp</parameter>, <parameter>latitude</parameter>, <parameter>longitude</parameter> and <parameter>altitude</parameter> can be <link linkend="NULL:CAPS"><type>NULL</type></link> if the result
is not required.</para>
<para>
</para><variablelist role="params">
<varlistentry><term><parameter>position</parameter> :</term>
<listitem><simpara> A <link linkend="GypsyPosition"><type>GypsyPosition</type></link>
</simpara></listitem></varlistentry>
<varlistentry><term><parameter>timestamp</parameter> :</term>
<listitem><simpara> Pointer to store the timestamp
</simpara></listitem></varlistentry>
<varlistentry><term><parameter>latitude</parameter> :</term>
<listitem><simpara> Pointer to store the latitude
</simpara></listitem></varlistentry>
<varlistentry><term><parameter>longitude</parameter> :</term>
<listitem><simpara> Pointer to store the longitude
</simpara></listitem></varlistentry>
<varlistentry><term><parameter>altitude</parameter> :</term>
<listitem><simpara> Pointer to store the altitude
</simpara></listitem></varlistentry>
<varlistentry><term><parameter>error</parameter> :</term>
<listitem><simpara> Pointer to store a <link linkend="GError"><type>GError</type></link>
</simpara></listitem></varlistentry>
<varlistentry><term><emphasis>Returns</emphasis> :</term><listitem><simpara> Bitmask of <link linkend="GypsyPositionFields"><type>GypsyPositionFields</type></link> indicating what field was set
</simpara></listitem></varlistentry>
</variablelist></refsect2>
</refsect1>
<refsect1 role="property_details">
<title role="property_details.title">Property Details</title>
<refsect2><title><anchor id="GypsyPosition--object-path"/>The "<literal>object-path</literal>" property</title>
<indexterm><primary>GypsyPosition:object-path</primary></indexterm><programlisting> "object-path" <link linkend="gchararray">gchararray</link> : Write / Construct Only</programlisting>
<para>
The path of the Gypsy GPS object</para>
<para>
</para><para>Default value: ""</para>
</refsect2>
</refsect1>
<refsect1 role="signals">
<title role="signals.title">Signal Details</title>
<refsect2><title><anchor id="GypsyPosition-position-changed"/>The "position-changed" signal</title>
<indexterm><primary>GypsyPosition::position-changed</primary></indexterm><programlisting><link linkend="void">void</link> user_function (<link linkend="GypsyPosition">GypsyPosition</link> *fields,
<link linkend="gint">gint</link> timestamp,
<link linkend="gint">gint</link> latitude,
<link linkend="gdouble">gdouble</link> longitude,
<link linkend="gdouble">gdouble</link> altitude,
<link linkend="gdouble">gdouble</link> arg5,
<link linkend="gpointer">gpointer</link> user_data) : Run First / No Recursion</programlisting>
<para>
The ::position-changed signal is emitted when the GPS device
indicates that one or more of the position fields has changed.
The fields which have changed will be indicated in the <parameter>fields</parameter>
bitmask.</para>
<para>
</para><variablelist role="params">
<varlistentry><term><parameter>fields</parameter> :</term>
<listitem><simpara> A bitmask of <link linkend="GypsyPositionFields"><type>GypsyPositionFields</type></link> indicating which of the following fields are valid
</simpara></listitem></varlistentry>
<varlistentry><term><parameter>timestamp</parameter> :</term>
<listitem><simpara> The timestamp when this change occurred
</simpara></listitem></varlistentry>
<varlistentry><term><parameter>latitude</parameter> :</term>
<listitem><simpara> The new latitude
</simpara></listitem></varlistentry>
<varlistentry><term><parameter>longitude</parameter> :</term>
<listitem><simpara> The new longitude
</simpara></listitem></varlistentry>
<varlistentry><term><parameter>altitude</parameter> :</term>
<listitem><simpara> The new altitude
</simpara></listitem></varlistentry>
<varlistentry><term><parameter>user_data</parameter> :</term>
<listitem><simpara>user data set when the signal handler was connected.</simpara></listitem></varlistentry>
</variablelist></refsect2>
</refsect1>
</refentry>
|
