/*
 * Stellarium
 * Copyright (C) 2009 Matthew Gates
 * Copyright (C) 2010 Bogdan Marinov
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */

/*!

@page scripting Scripting Engine

@tableofcontents

@section intro_scripts Introduction

Since version 0.10.1, Stellarium includes a scripting feature based on the 
<a href="http://qt-project.org/doc/qt-4.8/qtscript.html">Qt Scripting Engine</a>.  
This makes it possible to write small programs within Stellarium to produce 
presentations, set up custom configurations, and to automate repetitive 
tasks.  Prior to version 0.10.0, Stellarium used a different scripting engine 
called @ref StratoScript.

The core scripting language is
<a href="http://en.wikipedia.org/wiki/ECMAScript">ECMAScript</a>, giving users
access to all basic ECMAScript language features such as flow control, variables
string manipulation and so on. Interaction with Stellarium-specific features
is done via a collection of objects which represent components of Stellarium
itself.  See @ref scripting_api for more details.

@section scratoscript StratoScript

Prior to version 0.10.0, Stellarium had a simple scripting engine, known as 
\e StratoScript.  Using \e StratoScript it was possible to record and play back 
sequences of Stellarium commands, load and display custom images, and play sounds.  
In this way it was possible to make planetarium presentations - a feature used 
quite widely in the small planetarium community.

However \e StratoScript lacked many features of a real programming language -
there were no variables, no flow control and no way to introspect the state of
Stellarium.

The replacement scripting engine implemented in the 0.10.x series addresses these
shortcomings, at the expense of a little complexity and a new language syntax.

A compatibility mode which converts \e StratoScript into new scripting engine on
the fly is in progress.

Note: StratoScript compatibility is a build-time option. To enable this feature, 
Stellarium must be built using the ENABLE_STRATOSCRIPT_COMPAT=1 option to cmake.

@section scripting_api Scripting API

Interation with Stellarium-specific functionality is done by calling the
<b>public slots</b> of instances of a group of Stellarium's core classes.

- The public slots in the class StelMainScriptAPI are available via an object
  named \b core. For example, to access StelMainScriptAPI::wait() from a script,
  use the scripting command:
\code
core.wait(...);
\endcode

- The public slots for each of the following classes are available in the
  scripting engine via an object with the same name as the corresponding class:
   - ConstellationMgr
   - GridLinesMgr
   - LabelMgr
   - LandscapeMgr
   - MeteorMgr
   - NebulaMgr
   - ScreenImageMgr
   - SolarSystem
   - StarMgr
   - StelAudioMgr
   - StelVideoMgr
   - StelMovementMgr
   - StelSkyDrawer
   - StelSkyLayerMgr
   .
  For example, to access LandscapeMgr::setFlagAtmosphere(), use the scripting
  command: 
\code
LandscapeMgr.setFlagAtmosphere(true);
\endcode
  Note: All of these except for StelSkyDrawer are StelModule classes.

@section script_console Script Console

It is possible to open, edit run and save scripts using the script console window.  
To toggle the script console, press F12.  The script console also provides
an output window in which script debugging output is visible.

Note:  The Script Console is a build-time option.  It has been enabled by
default since version 0.10.5.  To enable or disable this feature, use the
ENABLE_SCRIPT_CONSOLE=1 or =0 option to cmake.

@section example_scripts Examples

The best source of examples is the \b scripts sub-directory of the main Stellarium 
source tree.  This directory contains a sub-directory called \b tests which are not
installed with Stellarium, but are nontheless useful sources of example code for
various scripting features. (The directory can be <a href="http://bazaar.launchpad.net/~stellarium/stellarium/trunk/files/head:/scripts/">browsed online</a>. Script files end in <tt>.ssc</tt> and <tt>.inc</tt>. Download links
are to the right.)

@subsection minimal_script Minimal Script

This script prints "Hello Universe" in the @ref script_console output window.

\code
core.debug("Hello Universe");
\endcode

@subsection using_module Using a StelModule

This script uses the LabelMgr module to display "Hello Universe" in white on
the screen for 3 seconds.

\code
LabelMgr.labelScreen("Hello Universe", 200, 200, true, 20, "#ff0000");
core.wait(3);
LabelMgr.deleteAllLabels();
\endcode

*/