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Diffstat (limited to 'src/declarative/util/qdeclarativeeasefollow.cpp')
| -rw-r--r-- | src/declarative/util/qdeclarativeeasefollow.cpp | 537 |
1 files changed, 0 insertions, 537 deletions
diff --git a/src/declarative/util/qdeclarativeeasefollow.cpp b/src/declarative/util/qdeclarativeeasefollow.cpp deleted file mode 100644 index ee181dd..0000000 --- a/src/declarative/util/qdeclarativeeasefollow.cpp +++ /dev/null @@ -1,537 +0,0 @@ -/**************************************************************************** -** -** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies). -** All rights reserved. -** Contact: Nokia Corporation (qt-info@nokia.com) -** -** This file is part of the QtDeclarative 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 "qdeclarativeeasefollow_p.h" - -#include "qdeclarativeanimation_p_p.h" - -#include <qdeclarativeproperty.h> - -#include <QtCore/qdebug.h> - -#include <math.h> - -QT_BEGIN_NAMESPACE - - - -class QDeclarativeEaseFollowPrivate : public QObjectPrivate -{ - Q_DECLARE_PUBLIC(QDeclarativeEaseFollow) -public: - QDeclarativeEaseFollowPrivate() - : source(0), velocity(200), duration(-1), maximumEasingTime(-1), - reversingMode(QDeclarativeEaseFollow::Eased), initialVelocity(0), - initialValue(0), invert(false), enabled(true), trackVelocity(0), clockOffset(0), - lastTick(0), clock(this) - {} - - qreal source; - qreal velocity; - qreal duration; - qreal maximumEasingTime; - QDeclarativeEaseFollow::ReversingMode reversingMode; - - qreal initialVelocity; - qreal initialValue; - bool invert; - bool enabled; - - qreal trackVelocity; - - QDeclarativeProperty target; - - int clockOffset; - int lastTick; - void tick(int); - void clockStart(); - void clockStop(); - QTickAnimationProxy<QDeclarativeEaseFollowPrivate, &QDeclarativeEaseFollowPrivate::tick> clock; - - void restart(); - - // Parameters for use in tick() - qreal a; // Acceleration - qreal d; // Deceleration - qreal tf; // Total time - qreal tp; // Time at which peak velocity occurs - qreal td; // Time at which decelleration begins - qreal vp; // Velocity at tp - qreal sp; // Displacement at tp - qreal sd; // Displacement at td - qreal vi; // "Normalized" initialvelocity - bool recalc(); -}; - -bool QDeclarativeEaseFollowPrivate::recalc() -{ - qreal s = source - initialValue; - vi = initialVelocity; - - s = (invert?-1.0:1.0) * s; - vi = (invert?-1.0:1.0) * vi; - - if (duration > 0 && velocity > 0) { - tf = s / velocity; - if (tf > (duration / 1000.)) tf = (duration / 1000.); - } else if (duration > 0) { - tf = duration / 1000.; - } else if (velocity > 0) { - tf = s / velocity; - } else { - return false; - } - - if (maximumEasingTime == 0) { - a = 0; - d = 0; - tp = 0; - td = tf; - vp = velocity; - sp = 0; - sd = s; - } else if (maximumEasingTime != -1 && tf > (maximumEasingTime / 1000.)) { - - qreal met = maximumEasingTime / 1000.; - td = tf - met; - - qreal c1 = td; - qreal c2 = (tf - td) * vi - tf * velocity; - qreal c3 = -0.5 * (tf - td) * vi * vi; - - qreal vp1 = (-c2 + sqrt(c2 * c2 - 4 * c1 * c3)) / (2. * c1); - // qreal vp2 = (-c2 - sqrt(c2 * c2 - 4 * c1 * c3)) / (2. * c1); - - vp = vp1; - a = vp / met; - d = a; - tp = (vp - vi) / a; - sp = vi * tp + 0.5 * a * tp * tp; - sd = sp + (td - tp) * vp; - } else { - - qreal c1 = 0.25 * tf * tf; - qreal c2 = 0.5 * vi * tf - s; - qreal c3 = -0.25 * vi * vi; - - qreal a1 = (-c2 + sqrt(c2 * c2 - 4 * c1 * c3)) / (2. * c1); - //qreal a2 = (-c2 - sqrt(c2 * c2 - 4 * c1 * c3)) / (2. * c1); - - qreal tp1 = 0.5 * tf - 0.5 * vi / a1; - //qreal tp2 = 0.5 * tf - 0.5 * vi / a2; - qreal vp1 = a1 * tp1 + vi; - //qreal vp2 = a2 * tp2 + vi; - - qreal sp1 = 0.5 * a1 * tp1 * tp1 + vi * tp1; - //qreal sp2 = 0.5 * a2 * tp2 * tp2 + vi * tp2; - - a = a1; - d = a1; - tp = tp1; - td = tp1; - vp = vp1; - sp = sp1; - sd = sp1; - } - - /* - qWarning() << "a:" << a << "tf:" << tf << "tp:" << tp << "vp:" - << vp << "sp:" << sp << "vi:" << vi << "invert:" << invert; - */ - return true; -} - -void QDeclarativeEaseFollowPrivate::clockStart() -{ - if (clock.state() == QAbstractAnimation::Running) { - clockOffset = lastTick; - return; - } else { - clockOffset = 0; - lastTick = 0; - clock.start(); - } -} - -void QDeclarativeEaseFollowPrivate::clockStop() -{ - clockOffset = 0; - lastTick = 0; - clock.stop(); -} - -void QDeclarativeEaseFollowPrivate::tick(int t) -{ - lastTick = t; - t -= clockOffset; - - qreal time_seconds = qreal(t) / 1000.; - - qreal out = 0; - if (time_seconds < tp) { - - trackVelocity = vi + time_seconds * a; - trackVelocity = (invert?-1.0:1.0) * trackVelocity; - - qreal value = 0.5 * a * time_seconds * time_seconds + vi * time_seconds; - value = (invert?-1.0:1.0) * value; - target.write(initialValue + value); - out = initialValue + value; - } else if (time_seconds < td) { - - time_seconds -= tp; - trackVelocity = (invert?-1.0:1.0) * vp; - qreal value = sp + time_seconds * vp; - value = (invert?-1.0:1.0) * value; - - target.write(initialValue + value); - - out = initialValue + value; - } else if (time_seconds < tf) { - - time_seconds -= td; - - trackVelocity = vp - time_seconds * a; - trackVelocity = (invert?-1.0:1.0) * trackVelocity; - - qreal value = sd - 0.5 * d * time_seconds * time_seconds + vp * time_seconds; - value = (invert?-1.0:1.0) * value; - - target.write(initialValue + value); - - out = initialValue + value; - } else { - - clock.stop(); - - trackVelocity = 0; - target.write(source); - } - - //qWarning() << out << trackVelocity << t << a; -} - -/*! - \qmlclass EaseFollow QDeclarativeEaseFollow - \since 4.7 - \brief The EaseFollow element allows a property to smoothly track a value. - - The EaseFollow smoothly animates a property's value to a set target value - using an ease in/out quad easing curve. If the target value changes while - the animation is in progress, the easing curves used to animate to the old - and the new target values are spliced together to avoid any obvious visual - glitches. - - The property animation is configured by setting the velocity at which the - animation should occur, or the duration that the animation should take. - If both a velocity and a duration are specified, the one that results in - the quickest animation is chosen for each change in the target value. - - For example, animating from 0 to 800 will take 4 seconds if a velocity - of 200 is set, will take 8 seconds with a duration of 8000 set, and will - take 4 seconds with both a velocity of 200 and a duration of 8000 set. - Animating from 0 to 20000 will take 10 seconds if a velocity of 200 is set, - will take 8 seconds with a duration of 8000 set, and will take 8 seconds - with both a velocity of 200 and a duration of 8000 set. - - The follow example shows one rectangle tracking the position of another. -\code -import Qt 4.6 - -Rectangle { - width: 800; height: 600; color: "blue" - - Rectangle { - color: "green" - width: 60; height: 60; - x: -5; y: -5; - EaseFollow on x { source: rect1.x - 5; velocity: 200 } - EaseFollow on y { source: rect1.y - 5; velocity: 200 } - } - - Rectangle { - id: rect1 - color: "red" - width: 50; height: 50; - } - - focus: true - Keys.onRightPressed: rect1.x = rect1.x + 100 - Keys.onLeftPressed: rect1.x = rect1.x - 100 - Keys.onUpPressed: rect1.y = rect1.y - 100 - Keys.onDownPressed: rect1.y = rect1.y + 100 -} -\endcode - - The default velocity of EaseFollow is 200 units/second. Note that if the range of the - value being animated is small, then the velocity will need to be adjusted - appropriately. For example, the opacity of an item ranges from 0 - 1.0. - To enable a smooth animation in this range the velocity will need to be - set to a value such as 0.5 units/second. Animating from 0 to 1.0 with a velocity - of 0.5 will take 2000 ms to complete. - - \sa SpringFollow -*/ - -QDeclarativeEaseFollow::QDeclarativeEaseFollow(QObject *parent) -: QObject(*(new QDeclarativeEaseFollowPrivate), parent) -{ -} - -QDeclarativeEaseFollow::~QDeclarativeEaseFollow() -{ -} - -/*! - \qmlproperty qreal EaseFollow::source - This property holds the source value which will be tracked. - - Bind to a property in order to track its changes. -*/ -qreal QDeclarativeEaseFollow::sourceValue() const -{ - Q_D(const QDeclarativeEaseFollow); - return d->source; -} - -/*! - \qmlproperty enumeration EaseFollow::reversingMode - - Sets how the EaseFollow behaves if an animation direction is reversed. - - If reversing mode is \c Eased, the animation will smoothly decelerate, and - then reverse direction. If the reversing mode is \c Immediate, the - animation will immediately begin accelerating in the reverse direction, - begining with a velocity of 0. If the reversing mode is \c Sync, the - property is immediately set to the target value. -*/ -QDeclarativeEaseFollow::ReversingMode QDeclarativeEaseFollow::reversingMode() const -{ - Q_D(const QDeclarativeEaseFollow); - return d->reversingMode; -} - -void QDeclarativeEaseFollow::setReversingMode(ReversingMode m) -{ - Q_D(QDeclarativeEaseFollow); - if (d->reversingMode == m) - return; - - d->reversingMode = m; - emit reversingModeChanged(); -} - -void QDeclarativeEaseFollowPrivate::restart() -{ - if (!enabled || velocity == 0) { - clockStop(); - return; - } - - initialValue = target.read().toReal(); - - if (source == initialValue) { - clockStop(); - return; - } - - bool hasReversed = trackVelocity != 0. && - ((trackVelocity > 0) == ((initialValue - source) > 0)); - - if (hasReversed) { - switch (reversingMode) { - default: - case QDeclarativeEaseFollow::Eased: - break; - case QDeclarativeEaseFollow::Sync: - target.write(source); - return; - case QDeclarativeEaseFollow::Immediate: - initialVelocity = 0; - clockStop(); - break; - } - } - - trackVelocity = initialVelocity; - - invert = (source < initialValue); - - if (!recalc()) { - target.write(source); - clockStop(); - return; - } - - clockStart(); -} - -void QDeclarativeEaseFollow::setSourceValue(qreal s) -{ - Q_D(QDeclarativeEaseFollow); - - if (d->clock.state() == QAbstractAnimation::Running && d->source == s) - return; - - d->source = s; - d->initialVelocity = d->trackVelocity; - d->restart(); - - emit sourceChanged(); -} - -/*! - \qmlproperty qreal EaseFollow::duration - - This property holds the animation duration used when tracking the source. - - Setting this to -1 (the default) disables the duration value. -*/ -qreal QDeclarativeEaseFollow::duration() const -{ - Q_D(const QDeclarativeEaseFollow); - return d->duration; -} - -void QDeclarativeEaseFollow::setDuration(qreal v) -{ - Q_D(QDeclarativeEaseFollow); - if (d->duration == v) - return; - - d->duration = v; - d->trackVelocity = 0; - - if (d->clock.state() == QAbstractAnimation::Running) - d->restart(); - - emit durationChanged(); -} - -qreal QDeclarativeEaseFollow::velocity() const -{ - Q_D(const QDeclarativeEaseFollow); - return d->velocity; -} - -/*! - \qmlproperty qreal EaseFollow::velocity - - This property holds the average velocity allowed when tracking the source. - - The default velocity of EaseFollow is 200 units/second. - - Setting this to -1 disables the velocity value. -*/ -void QDeclarativeEaseFollow::setVelocity(qreal v) -{ - Q_D(QDeclarativeEaseFollow); - if (d->velocity == v) - return; - - d->velocity = v; - d->trackVelocity = 0; - - if (d->clock.state() == QAbstractAnimation::Running) - d->restart(); - - emit velocityChanged(); -} - -/*! - \qmlproperty bool EaseFollow::enabled - This property holds whether the target will track the source. -*/ -bool QDeclarativeEaseFollow::enabled() const -{ - Q_D(const QDeclarativeEaseFollow); - return d->enabled; -} - -void QDeclarativeEaseFollow::setEnabled(bool enabled) -{ - Q_D(QDeclarativeEaseFollow); - if (d->enabled == enabled) - return; - - d->enabled = enabled; - if (enabled) - d->restart(); - else - d->clockStop(); - - emit enabledChanged(); -} - -void QDeclarativeEaseFollow::setTarget(const QDeclarativeProperty &t) -{ - Q_D(QDeclarativeEaseFollow); - d->target = t; -} - -/*! -\qmlproperty qreal EaseFollow::maximumEasingTime - -This property specifies the maximum time an "eases" during the follow should take. -Setting this property causes the velocity to "level out" after at a time. Setting -a negative value reverts to the normal mode of easing over the entire animation -duration. - -The default value is -1. -*/ -qreal QDeclarativeEaseFollow::maximumEasingTime() const -{ - Q_D(const QDeclarativeEaseFollow); - return d->maximumEasingTime; -} - -void QDeclarativeEaseFollow::setMaximumEasingTime(qreal v) -{ - Q_D(QDeclarativeEaseFollow); - d->maximumEasingTime = v; - - if (d->clock.state() == QAbstractAnimation::Running) - d->restart(); - - emit maximumEasingTimeChanged(); -} - -QT_END_NAMESPACE |