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+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the documentation of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+/*!
+ \example animation/stickman
+ \title Stickman Example
+
+ The Stickman example shows how to animate transitions in a state machine to implement key frame
+ animations.
+
+ \image stickman-example.png
+
+ In this example, we will write a small application which animates the joints in a skeleton and
+ projects a stickman figure on top. The stickman can be either "alive" or "dead", and when in the
+ "alive" state, he can be performing different actions defined by key frame animations.
+
+ Animations are implemented as composite states. Each child state of the animation state
+ represents a frame in the animation by setting the position of each joint in the stickman's
+ skeleton to the positions defined for the particular frame. The frames are then bound together
+ with animated transitions that trigger on the source state's polished() signal. Thus, the
+ machine will enter the state representing the next state in the animation immediately after it
+ has finished animating into the previous frame.
+
+ \image stickman-example1.png
+
+ The states for an animation is constructed by reading a custom animation file format and
+ creating states that assign values to the the "position" properties of each of the nodes in the
+ skeleton graph.
+
+ \snippet examples/animation/stickman/lifecycle.cpp 1
+
+ The states are then bound together with signal transitions that listen to the polished() signal.
+
+ \snippet examples/animation/stickman/lifecycle.cpp 2
+
+ The last frame state is given a transition to the first one, so that the animation will loop
+ until it is interrupted when a transition out from the animation state is taken. To get smooth
+ animations between the different key frames, we set a default animation on the state machine.
+ This is a parallel animation group which contain animations for all the "position" properties
+ and will be selected by default when taking any transition that leads into a state that assigns
+ values to these properties.
+
+ \snippet examples/animation/stickman/lifecycle.cpp 3
+
+ Several such animation states are constructed, and are placed together as children of a top
+ level "alive" state which represents the stickman life cycle. Transitions go from the parent
+ state to the child state to ensure that each of the child states inherit them.
+
+ \image stickman-example2.png
+
+ This saves us the effort of connect every state to every state with identical transitions. The
+ state machine makes sure that transitions between the key frame animations are also smooth by
+ applying the default animation when interrupting one and starting another.
+
+ Finally, there is a transition out from the "alive" state and into the "dead" state. This is
+ a custom transition type called LightningStrikesTransition which samples every second and
+ triggers at random (one out of fifty times on average.)
+
+ \snippet examples/animation/stickman/lifecycle.cpp 4
+
+ When it triggers, the machine will first enter a "lightningStrike" state which uses a timer to
+ pause for a brief period of time while the background color of the scene is white. This gives us
+ a flash effect when the lightning strikes.
+
+ \snippet examples/animation/stickman/lifecycle.cpp 5
+
+ We start and stop a QTimer object when entering and exiting the state. Then we transition into
+ the "dead" state when the timer times out.
+
+ \snippet examples/animation/stickman/lifecycle.cpp 0
+
+ When the machine is in the "dead" state, it will be unresponsive. This is because the "dead"
+ state has no transitions leading out.
+
+ \image stickman-example3.png
+
+*/
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