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authorQt by Nokia <qt-info@nokia.com>2011-04-27 12:05:43 +0200
committeraxis <qt-info@nokia.com>2011-04-27 12:05:43 +0200
commit38be0d13830efd2d98281c645c3a60afe05ffece (patch)
tree6ea73f3ec77f7d153333779883e8120f82820abe /src/gui/graphicsview/qgraphicsitemanimation.cpp
Initial import from the monolithic Qt.
This is the beginning of revision history for this module. If you want to look at revision history older than this, please refer to the Qt Git wiki for how to use Git history grafting. At the time of writing, this wiki is located here: http://qt.gitorious.org/qt/pages/GitIntroductionWithQt If you have already performed the grafting and you don't see any history beyond this commit, try running "git log" with the "--follow" argument. Branched from the monolithic repo, Qt master branch, at commit 896db169ea224deb96c59ce8af800d019de63f12
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+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtGui 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.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+/*!
+ \class QGraphicsItemAnimation
+ \brief The QGraphicsItemAnimation class provides simple animation
+ support for QGraphicsItem.
+ \since 4.2
+ \ingroup graphicsview-api
+ \deprecated
+
+ The QGraphicsItemAnimation class animates a QGraphicsItem. You can
+ schedule changes to the item's transformation matrix at
+ specified steps. The QGraphicsItemAnimation class has a
+ current step value. When this value changes the transformations
+ scheduled at that step are performed. The current step of the
+ animation is set with the \c setStep() function.
+
+ QGraphicsItemAnimation will do a simple linear interpolation
+ between the nearest adjacent scheduled changes to calculate the
+ matrix. For instance, if you set the position of an item at values
+ 0.0 and 1.0, the animation will show the item moving in a straight
+ line between these positions. The same is true for scaling and
+ rotation.
+
+ It is usual to use the class with a QTimeLine. The timeline's
+ \l{QTimeLine::}{valueChanged()} signal is then connected to the
+ \c setStep() slot. For example, you can set up an item for rotation
+ by calling \c setRotationAt() for different step values.
+ The animations timeline is set with the setTimeLine() function.
+
+ An example animation with a timeline follows:
+
+ \snippet doc/src/snippets/timeline/main.cpp 0
+
+ Note that steps lie between 0.0 and 1.0. It may be necessary to use
+ \l{QTimeLine::}{setUpdateInterval()}. The default update interval
+ is 40 ms. A scheduled transformation cannot be removed when set,
+ so scheduling several transformations of the same kind (e.g.,
+ rotations) at the same step is not recommended.
+
+ \sa QTimeLine, {Graphics View Framework}
+*/
+
+#include "qgraphicsitemanimation.h"
+
+#ifndef QT_NO_GRAPHICSVIEW
+
+#include "qgraphicsitem.h"
+
+#include <QtCore/qtimeline.h>
+#include <QtCore/qpoint.h>
+#include <QtCore/qpointer.h>
+#include <QtCore/qpair.h>
+#include <QtGui/qmatrix.h>
+
+QT_BEGIN_NAMESPACE
+
+class QGraphicsItemAnimationPrivate
+{
+public:
+ inline QGraphicsItemAnimationPrivate()
+ : q(0), timeLine(0), item(0), step(0)
+ { }
+
+ QGraphicsItemAnimation *q;
+
+ QPointer<QTimeLine> timeLine;
+ QGraphicsItem *item;
+
+ QPointF startPos;
+ QMatrix startMatrix;
+
+ qreal step;
+
+ struct Pair {
+ Pair(qreal a, qreal b) : step(a), value(b) {}
+ bool operator <(const Pair &other) const
+ { return step < other.step; }
+ bool operator==(const Pair &other) const
+ { return step == other.step; }
+ qreal step;
+ qreal value;
+ };
+ QList<Pair> xPosition;
+ QList<Pair> yPosition;
+ QList<Pair> rotation;
+ QList<Pair> verticalScale;
+ QList<Pair> horizontalScale;
+ QList<Pair> verticalShear;
+ QList<Pair> horizontalShear;
+ QList<Pair> xTranslation;
+ QList<Pair> yTranslation;
+
+ qreal linearValueForStep(qreal step, QList<Pair> *source, qreal defaultValue = 0);
+ void insertUniquePair(qreal step, qreal value, QList<Pair> *binList, const char* method);
+};
+
+qreal QGraphicsItemAnimationPrivate::linearValueForStep(qreal step, QList<Pair> *source, qreal defaultValue)
+{
+ if (source->isEmpty())
+ return defaultValue;
+ step = qMin<qreal>(qMax<qreal>(step, 0), 1);
+
+ if (step == 1)
+ return source->last().value;
+
+ qreal stepBefore = 0;
+ qreal stepAfter = 1;
+ qreal valueBefore = source->first().step == 0 ? source->first().value : defaultValue;
+ qreal valueAfter = source->last().value;
+
+ // Find the closest step and value before the given step.
+ for (int i = 0; i < source->size() && step >= source->at(i).step; ++i) {
+ stepBefore = source->at(i).step;
+ valueBefore = source->at(i).value;
+ }
+
+ // Find the closest step and value after the given step.
+ for (int j = source->size() - 1; j >= 0 && step < source->at(j).step; --j) {
+ stepAfter = source->at(j).step;
+ valueAfter = source->at(j).value;
+ }
+
+ // Do a simple linear interpolation.
+ return valueBefore + (valueAfter - valueBefore) * ((step - stepBefore) / (stepAfter - stepBefore));
+}
+
+void QGraphicsItemAnimationPrivate::insertUniquePair(qreal step, qreal value, QList<Pair> *binList, const char* method)
+{
+ if (step < 0.0 || step > 1.0) {
+ qWarning("QGraphicsItemAnimation::%s: invalid step = %f", method, step);
+ return;
+ }
+
+ Pair pair(step, value);
+
+ QList<Pair>::iterator result = qBinaryFind(binList->begin(), binList->end(), pair);
+ if (result != binList->end())
+ result->value = value;
+ else {
+ *binList << pair;
+ qSort(binList->begin(), binList->end());
+ }
+}
+
+/*!
+ Constructs an animation object with the given \a parent.
+*/
+QGraphicsItemAnimation::QGraphicsItemAnimation(QObject *parent)
+ : QObject(parent), d(new QGraphicsItemAnimationPrivate)
+{
+ d->q = this;
+}
+
+/*!
+ Destroys the animation object.
+*/
+QGraphicsItemAnimation::~QGraphicsItemAnimation()
+{
+ delete d;
+}
+
+/*!
+ Returns the item on which the animation object operates.
+
+ \sa setItem()
+*/
+QGraphicsItem *QGraphicsItemAnimation::item() const
+{
+ return d->item;
+}
+
+/*!
+ Sets the specified \a item to be used in the animation.
+
+ \sa item()
+*/
+void QGraphicsItemAnimation::setItem(QGraphicsItem *item)
+{
+ d->item = item;
+ d->startPos = d->item->pos();
+}
+
+/*!
+ Returns the timeline object used to control the rate at which the animation
+ occurs.
+
+ \sa setTimeLine()
+*/
+QTimeLine *QGraphicsItemAnimation::timeLine() const
+{
+ return d->timeLine;
+}
+
+/*!
+ Sets the timeline object used to control the rate of animation to the \a timeLine
+ specified.
+
+ \sa timeLine()
+*/
+void QGraphicsItemAnimation::setTimeLine(QTimeLine *timeLine)
+{
+ if (d->timeLine == timeLine)
+ return;
+ if (d->timeLine)
+ delete d->timeLine;
+ if (!timeLine)
+ return;
+ d->timeLine = timeLine;
+ connect(timeLine, SIGNAL(valueChanged(qreal)), this, SLOT(setStep(qreal)));
+}
+
+/*!
+ Returns the position of the item at the given \a step value.
+
+ \sa setPosAt()
+*/
+QPointF QGraphicsItemAnimation::posAt(qreal step) const
+{
+ if (step < 0.0 || step > 1.0)
+ qWarning("QGraphicsItemAnimation::posAt: invalid step = %f", step);
+
+ return QPointF(d->linearValueForStep(step, &d->xPosition, d->startPos.x()),
+ d->linearValueForStep(step, &d->yPosition, d->startPos.y()));
+}
+
+/*!
+ \fn void QGraphicsItemAnimation::setPosAt(qreal step, const QPointF &point)
+
+ Sets the position of the item at the given \a step value to the \a point specified.
+
+ \sa posAt()
+*/
+void QGraphicsItemAnimation::setPosAt(qreal step, const QPointF &pos)
+{
+ d->insertUniquePair(step, pos.x(), &d->xPosition, "setPosAt");
+ d->insertUniquePair(step, pos.y(), &d->yPosition, "setPosAt");
+}
+
+/*!
+ Returns all explicitly inserted positions.
+
+ \sa posAt(), setPosAt()
+*/
+QList<QPair<qreal, QPointF> > QGraphicsItemAnimation::posList() const
+{
+ QList<QPair<qreal, QPointF> > list;
+ for (int i = 0; i < d->xPosition.size(); ++i)
+ list << QPair<qreal, QPointF>(d->xPosition.at(i).step, QPointF(d->xPosition.at(i).value, d->yPosition.at(i).value));
+
+ return list;
+}
+
+/*!
+ Returns the matrix used to transform the item at the specified \a step value.
+*/
+QMatrix QGraphicsItemAnimation::matrixAt(qreal step) const
+{
+ if (step < 0.0 || step > 1.0)
+ qWarning("QGraphicsItemAnimation::matrixAt: invalid step = %f", step);
+
+ QMatrix matrix;
+ if (!d->rotation.isEmpty())
+ matrix.rotate(rotationAt(step));
+ if (!d->verticalScale.isEmpty())
+ matrix.scale(horizontalScaleAt(step), verticalScaleAt(step));
+ if (!d->verticalShear.isEmpty())
+ matrix.shear(horizontalShearAt(step), verticalShearAt(step));
+ if (!d->xTranslation.isEmpty())
+ matrix.translate(xTranslationAt(step), yTranslationAt(step));
+ return matrix;
+}
+
+/*!
+ Returns the angle at which the item is rotated at the specified \a step value.
+
+ \sa setRotationAt()
+*/
+qreal QGraphicsItemAnimation::rotationAt(qreal step) const
+{
+ if (step < 0.0 || step > 1.0)
+ qWarning("QGraphicsItemAnimation::rotationAt: invalid step = %f", step);
+
+ return d->linearValueForStep(step, &d->rotation);
+}
+
+/*!
+ Sets the rotation of the item at the given \a step value to the \a angle specified.
+
+ \sa rotationAt()
+*/
+void QGraphicsItemAnimation::setRotationAt(qreal step, qreal angle)
+{
+ d->insertUniquePair(step, angle, &d->rotation, "setRotationAt");
+}
+
+/*!
+ Returns all explicitly inserted rotations.
+
+ \sa rotationAt(), setRotationAt()
+*/
+QList<QPair<qreal, qreal> > QGraphicsItemAnimation::rotationList() const
+{
+ QList<QPair<qreal, qreal> > list;
+ for (int i = 0; i < d->rotation.size(); ++i)
+ list << QPair<qreal, qreal>(d->rotation.at(i).step, d->rotation.at(i).value);
+
+ return list;
+}
+
+/*!
+ Returns the horizontal translation of the item at the specified \a step value.
+
+ \sa setTranslationAt()
+*/
+qreal QGraphicsItemAnimation::xTranslationAt(qreal step) const
+{
+ if (step < 0.0 || step > 1.0)
+ qWarning("QGraphicsItemAnimation::xTranslationAt: invalid step = %f", step);
+
+ return d->linearValueForStep(step, &d->xTranslation);
+}
+
+/*!
+ Returns the vertical translation of the item at the specified \a step value.
+
+ \sa setTranslationAt()
+*/
+qreal QGraphicsItemAnimation::yTranslationAt(qreal step) const
+{
+ if (step < 0.0 || step > 1.0)
+ qWarning("QGraphicsItemAnimation::yTranslationAt: invalid step = %f", step);
+
+ return d->linearValueForStep(step, &d->yTranslation);
+}
+
+/*!
+ Sets the translation of the item at the given \a step value using the horizontal
+ and vertical coordinates specified by \a dx and \a dy.
+
+ \sa xTranslationAt(), yTranslationAt()
+*/
+void QGraphicsItemAnimation::setTranslationAt(qreal step, qreal dx, qreal dy)
+{
+ d->insertUniquePair(step, dx, &d->xTranslation, "setTranslationAt");
+ d->insertUniquePair(step, dy, &d->yTranslation, "setTranslationAt");
+}
+
+/*!
+ Returns all explicitly inserted translations.
+
+ \sa xTranslationAt(), yTranslationAt(), setTranslationAt()
+*/
+QList<QPair<qreal, QPointF> > QGraphicsItemAnimation::translationList() const
+{
+ QList<QPair<qreal, QPointF> > list;
+ for (int i = 0; i < d->xTranslation.size(); ++i)
+ list << QPair<qreal, QPointF>(d->xTranslation.at(i).step, QPointF(d->xTranslation.at(i).value, d->yTranslation.at(i).value));
+
+ return list;
+}
+
+/*!
+ Returns the vertical scale for the item at the specified \a step value.
+
+ \sa setScaleAt()
+*/
+qreal QGraphicsItemAnimation::verticalScaleAt(qreal step) const
+{
+ if (step < 0.0 || step > 1.0)
+ qWarning("QGraphicsItemAnimation::verticalScaleAt: invalid step = %f", step);
+
+ return d->linearValueForStep(step, &d->verticalScale, 1);
+}
+
+/*!
+ Returns the horizontal scale for the item at the specified \a step value.
+
+ \sa setScaleAt()
+*/
+qreal QGraphicsItemAnimation::horizontalScaleAt(qreal step) const
+{
+ if (step < 0.0 || step > 1.0)
+ qWarning("QGraphicsItemAnimation::horizontalScaleAt: invalid step = %f", step);
+
+ return d->linearValueForStep(step, &d->horizontalScale, 1);
+}
+
+/*!
+ Sets the scale of the item at the given \a step value using the horizontal and
+ vertical scale factors specified by \a sx and \a sy.
+
+ \sa verticalScaleAt(), horizontalScaleAt()
+*/
+void QGraphicsItemAnimation::setScaleAt(qreal step, qreal sx, qreal sy)
+{
+ d->insertUniquePair(step, sx, &d->horizontalScale, "setScaleAt");
+ d->insertUniquePair(step, sy, &d->verticalScale, "setScaleAt");
+}
+
+/*!
+ Returns all explicitly inserted scales.
+
+ \sa verticalScaleAt(), horizontalScaleAt(), setScaleAt()
+*/
+QList<QPair<qreal, QPointF> > QGraphicsItemAnimation::scaleList() const
+{
+ QList<QPair<qreal, QPointF> > list;
+ for (int i = 0; i < d->horizontalScale.size(); ++i)
+ list << QPair<qreal, QPointF>(d->horizontalScale.at(i).step, QPointF(d->horizontalScale.at(i).value, d->verticalScale.at(i).value));
+
+ return list;
+}
+
+/*!
+ Returns the vertical shear for the item at the specified \a step value.
+
+ \sa setShearAt()
+*/
+qreal QGraphicsItemAnimation::verticalShearAt(qreal step) const
+{
+ if (step < 0.0 || step > 1.0)
+ qWarning("QGraphicsItemAnimation::verticalShearAt: invalid step = %f", step);
+
+ return d->linearValueForStep(step, &d->verticalShear, 0);
+}
+
+/*!
+ Returns the horizontal shear for the item at the specified \a step value.
+
+ \sa setShearAt()
+*/
+qreal QGraphicsItemAnimation::horizontalShearAt(qreal step) const
+{
+ if (step < 0.0 || step > 1.0)
+ qWarning("QGraphicsItemAnimation::horizontalShearAt: invalid step = %f", step);
+
+ return d->linearValueForStep(step, &d->horizontalShear, 0);
+}
+
+/*!
+ Sets the shear of the item at the given \a step value using the horizontal and
+ vertical shear factors specified by \a sh and \a sv.
+
+ \sa verticalShearAt(), horizontalShearAt()
+*/
+void QGraphicsItemAnimation::setShearAt(qreal step, qreal sh, qreal sv)
+{
+ d->insertUniquePair(step, sh, &d->horizontalShear, "setShearAt");
+ d->insertUniquePair(step, sv, &d->verticalShear, "setShearAt");
+}
+
+/*!
+ Returns all explicitly inserted shears.
+
+ \sa verticalShearAt(), horizontalShearAt(), setShearAt()
+*/
+QList<QPair<qreal, QPointF> > QGraphicsItemAnimation::shearList() const
+{
+ QList<QPair<qreal, QPointF> > list;
+ for (int i = 0; i < d->horizontalShear.size(); ++i)
+ list << QPair<qreal, QPointF>(d->horizontalShear.at(i).step, QPointF(d->horizontalShear.at(i).value, d->verticalShear.at(i).value));
+
+ return list;
+}
+
+/*!
+ Clears the scheduled transformations used for the animation, but
+ retains the item and timeline.
+*/
+void QGraphicsItemAnimation::clear()
+{
+ d->xPosition.clear();
+ d->yPosition.clear();
+ d->rotation.clear();
+ d->verticalScale.clear();
+ d->horizontalScale.clear();
+ d->verticalShear.clear();
+ d->horizontalShear.clear();
+ d->xTranslation.clear();
+ d->yTranslation.clear();
+}
+
+/*!
+ \fn void QGraphicsItemAnimation::setStep(qreal step)
+
+ Sets the current \a step value for the animation, causing the
+ transformations scheduled at this step to be performed.
+*/
+void QGraphicsItemAnimation::setStep(qreal x)
+{
+ if (x < 0.0 || x > 1.0) {
+ qWarning("QGraphicsItemAnimation::setStep: invalid step = %f", x);
+ return;
+ }
+
+ beforeAnimationStep(x);
+
+ d->step = x;
+ if (d->item) {
+ if (!d->xPosition.isEmpty() || !d->yPosition.isEmpty())
+ d->item->setPos(posAt(x));
+ if (!d->rotation.isEmpty()
+ || !d->verticalScale.isEmpty()
+ || !d->horizontalScale.isEmpty()
+ || !d->verticalShear.isEmpty()
+ || !d->horizontalShear.isEmpty()
+ || !d->xTranslation.isEmpty()
+ || !d->yTranslation.isEmpty()) {
+ d->item->setMatrix(d->startMatrix * matrixAt(x));
+ }
+ }
+
+ afterAnimationStep(x);
+}
+
+/*!
+ Resets the item to its starting position and transformation.
+
+ \obsolete
+
+ You can call setStep(0) instead.
+*/
+void QGraphicsItemAnimation::reset()
+{
+ if (!d->item)
+ return;
+ d->startPos = d->item->pos();
+ d->startMatrix = d->item->matrix();
+}
+
+/*!
+ \fn void QGraphicsItemAnimation::beforeAnimationStep(qreal step)
+
+ This method is meant to be overridden by subclassed that needs to
+ execute additional code before a new step takes place. The
+ animation \a step is provided for use in cases where the action
+ depends on its value.
+*/
+void QGraphicsItemAnimation::beforeAnimationStep(qreal step)
+{
+ Q_UNUSED(step);
+}
+
+/*!
+ \fn void QGraphicsItemAnimation::afterAnimationStep(qreal step)
+
+ This method is meant to be overridden in subclasses that need to
+ execute additional code after a new step has taken place. The
+ animation \a step is provided for use in cases where the action
+ depends on its value.
+*/
+void QGraphicsItemAnimation::afterAnimationStep(qreal step)
+{
+ Q_UNUSED(step);
+}
+
+QT_END_NAMESPACE
+
+#endif // QT_NO_GRAPHICSVIEW