examples/animation/stickman/lifecycle.cpp
changeset 0 1918ee327afb
child 3 41300fa6a67c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/examples/animation/stickman/lifecycle.cpp	Mon Jan 11 14:00:40 2010 +0000
@@ -0,0 +1,214 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtCore module 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 Technology Preview License Agreement accompanying
+** this package.
+**
+** 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 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "lifecycle.h"
+#include "stickman.h"
+#include "node.h"
+#include "animation.h"
+#include "graphicsview.h"
+
+#include <QtCore>
+#include <QtGui>
+
+class KeyPressTransition: public QSignalTransition
+{
+public:
+    KeyPressTransition(GraphicsView *receiver, Qt::Key key)
+        : QSignalTransition(receiver, SIGNAL(keyPressed(int))), m_key(key)
+    {
+    }
+    KeyPressTransition(GraphicsView *receiver, Qt::Key key, QAbstractState *target)
+        : QSignalTransition(receiver, SIGNAL(keyPressed(int))), m_key(key)
+    {
+        setTargetState(target);
+    }
+
+    virtual bool eventTest(QEvent *e)
+    {
+        if (QSignalTransition::eventTest(e)) {
+            QVariant key = static_cast<QStateMachine::SignalEvent*>(e)->arguments().at(0);
+            return (key.toInt() == int(m_key));
+        } 
+
+        return false;
+    }
+private:
+    Qt::Key m_key;
+};
+
+//! [4]
+class LightningStrikesTransition: public QEventTransition
+{
+public:
+    LightningStrikesTransition(QAbstractState *target)
+        : QEventTransition(this, QEvent::Timer)
+    {
+        setTargetState(target);
+        qsrand((uint)QDateTime::currentDateTime().toTime_t());
+        startTimer(1000);
+    }
+
+    virtual bool eventTest(QEvent *e)
+    {
+        return QEventTransition::eventTest(e) && ((qrand() % 50) == 0);
+    }
+};
+//! [4]
+
+LifeCycle::LifeCycle(StickMan *stickMan, GraphicsView *keyReceiver)
+    : m_stickMan(stickMan), m_keyReceiver(keyReceiver)
+{
+    // Create animation group to be used for all transitions
+    m_animationGroup = new QParallelAnimationGroup();
+    const int stickManNodeCount = m_stickMan->nodeCount();
+    for (int i=0; i<stickManNodeCount; ++i) {
+        QPropertyAnimation *pa = new QPropertyAnimation(m_stickMan->node(i), "pos");
+        m_animationGroup->addAnimation(pa);    
+    }
+
+    // Set up intial state graph
+//! [3]
+    m_machine = new QStateMachine();
+    m_machine->addDefaultAnimation(m_animationGroup);
+//! [3]
+
+    m_alive = new QState(m_machine);
+    m_alive->setObjectName("alive");
+    
+    // Make it blink when lightning strikes before entering dead animation
+    QState *lightningBlink = new QState(m_machine);    
+    lightningBlink->assignProperty(m_stickMan->scene(), "backgroundBrush", Qt::white);
+    lightningBlink->assignProperty(m_stickMan, "penColor", Qt::black);
+    lightningBlink->assignProperty(m_stickMan, "fillColor", Qt::white);
+    lightningBlink->assignProperty(m_stickMan, "isDead", true);
+    
+//! [5]
+    QTimer *timer = new QTimer(lightningBlink);
+    timer->setSingleShot(true);
+    timer->setInterval(100);
+    QObject::connect(lightningBlink, SIGNAL(entered()), timer, SLOT(start()));
+    QObject::connect(lightningBlink, SIGNAL(exited()), timer, SLOT(stop()));
+//! [5]
+  
+    m_dead = new QState(m_machine);
+    m_dead->assignProperty(m_stickMan->scene(), "backgroundBrush", Qt::black);
+    m_dead->assignProperty(m_stickMan, "penColor", Qt::white);
+    m_dead->assignProperty(m_stickMan, "fillColor", Qt::black);
+    m_dead->setObjectName("dead");
+           
+    // Idle state (sets no properties)
+    m_idle = new QState(m_alive);
+    m_idle->setObjectName("idle");
+
+    m_alive->setInitialState(m_idle);
+
+    // Lightning strikes at random
+    m_alive->addTransition(new LightningStrikesTransition(lightningBlink));
+//! [0]
+    lightningBlink->addTransition(timer, SIGNAL(timeout()), m_dead);
+//! [0]
+
+    m_machine->setInitialState(m_alive);
+}
+
+void LifeCycle::setDeathAnimation(const QString &fileName)
+{
+    QState *deathAnimation = makeState(m_dead, fileName);
+    m_dead->setInitialState(deathAnimation);
+}
+
+void LifeCycle::start()
+{
+    m_machine->start();
+}
+
+void LifeCycle::addActivity(const QString &fileName, Qt::Key key)
+{
+    QState *state = makeState(m_alive, fileName);
+    m_alive->addTransition(new KeyPressTransition(m_keyReceiver, key, state));
+}
+
+QState *LifeCycle::makeState(QState *parentState, const QString &animationFileName)
+{
+    QState *topLevel = new QState(parentState);
+    
+    Animation animation;
+    {
+        QFile file(animationFileName);
+        if (file.open(QIODevice::ReadOnly))
+            animation.load(&file);
+    }
+
+    const int frameCount = animation.totalFrames();
+    QState *previousState = 0;
+    for (int i=0; i<frameCount; ++i) {
+        animation.setCurrentFrame(i);
+
+//! [1]
+        QState *frameState = new QState(topLevel);                       
+        const int nodeCount = animation.nodeCount();
+        for (int j=0; j<nodeCount; ++j)
+            frameState->assignProperty(m_stickMan->node(j), "pos", animation.nodePos(j));
+//! [1]
+
+        frameState->setObjectName(QString::fromLatin1("frame %0").arg(i));
+        if (previousState == 0)
+            topLevel->setInitialState(frameState);
+        else
+//! [2]
+            previousState->addTransition(previousState, SIGNAL(polished()), frameState);
+//! [2]
+        
+        previousState = frameState;
+    }
+
+    // Loop
+    previousState->addTransition(previousState, SIGNAL(polished()), topLevel->initialState());
+
+    return topLevel;
+
+}
+
+LifeCycle::~LifeCycle()
+{
+    delete m_machine;
+    delete m_animationGroup;
+}