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Diffstat (limited to 'demos/qt3d/photobrowser3d/pancontroller.cpp')
| -rw-r--r-- | demos/qt3d/photobrowser3d/pancontroller.cpp | 244 |
1 files changed, 244 insertions, 0 deletions
diff --git a/demos/qt3d/photobrowser3d/pancontroller.cpp b/demos/qt3d/photobrowser3d/pancontroller.cpp new file mode 100644 index 000000000..e45b4abeb --- /dev/null +++ b/demos/qt3d/photobrowser3d/pancontroller.cpp @@ -0,0 +1,244 @@ +/**************************************************************************** +** +** 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 QtQuick3D 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 "pancontroller.h" +#include "qglview.h" +#include "qglcamera.h" +#include "photobrowser3dview.h" + +#include <qmath.h> + +#include <QtGlobal> +#include <QTime> + +class PanControllerPrivate +{ +public: + PanControllerPrivate() + : speed(0.0f) + , angle(0.0f) + , arrowDirection(Qt::NoArrow) + , view(0) + , maxSpeed(4.0f) + , defaultDistance(0.0f) + , panDistance(0.0f) + , panViewAngle(M_PI / 4.0f) // 45 degrees in radians + , animating(false) + , elapsed(0.0f) + { + panTime.start(); + } + + void calculateValues(); + + qreal speed; + qreal angle; + Qt::ArrowType arrowDirection; + QGLView *view; + QTime panTime; + qreal maxSpeed; + qreal defaultDistance; + qreal panDistance; + qreal panViewAngle; + bool animating; + qreal elapsed; +}; + +PanController::PanController(QObject *parent) + : QObject(parent) + , d(new PanControllerPrivate) +{ + QGLView *v = qobject_cast<QGLView*>(parent); + if (v) + d->view = v; +} + +PanController::~PanController() +{ + delete d; +} + +qreal PanController::defaultDistance() const +{ + return d->defaultDistance; +} + +void PanController::setDefaultDistance(qreal dist) +{ + d->defaultDistance = dist; +} + +qreal PanController::panDistance() const +{ + return d->panDistance; +} + +void PanController::setPanDistance(qreal dist) +{ + d->panDistance = dist; +} + +qreal PanController::panViewAngle() const +{ + return d->panViewAngle; +} + +void PanController::setPanViewAngle(qreal angle) +{ + d->panViewAngle = angle; +} + +void PanController::setMaxSpeed(qreal maxSpeed) +{ + d->maxSpeed = maxSpeed; +} + +qreal PanController::maxSpeed() const +{ + return d->maxSpeed; +} + +void PanController::setSpeed(qreal speed) +{ + qreal t = d->panTime.restart(); + if (d->speed != speed) + { + d->speed = speed; + d->angle = speed * d->panViewAngle; + if (!qIsNull(d->speed)) + d->animating = true; + d->elapsed += t; + d->calculateValues(); + emit speedChanged(); + } +} + +qreal PanController::speed() const +{ + return d->speed; +} + +void PanController::pan() +{ + if (d->animating) + { + qreal t = d->panTime.restart(); + d->elapsed += t; + // dont recalculate every single time + // 30ms frame time == 33fps - more than enough + if (d->elapsed > 30) + d->calculateValues(); + + PhotoBrowser3DView *view = qobject_cast<PhotoBrowser3DView*>(parent()); + Q_ASSERT(view); + view->update(); + } +} + +void PanControllerPrivate::calculateValues() +{ + if (view && animating) + { + QGLCamera *cam = view->camera(); + Q_ASSERT(cam); + + QVector3D c = cam->center(); + QVector3D e = cam->eye(); + + if (qFuzzyIsNull(speed)) + { + c.setX(e.x()); + e.setZ(defaultDistance); + } + else + { + // as speed goes from 0 -> 1, eye moves closer to z=0 plane + e.setZ(defaultDistance - (speed * (defaultDistance - panDistance))); + + // the view angle is a direct function of the speed see setSpeed() above + // and as view angle increases we look further along the x-axis + qreal opp = (e.z() - c.z()) * qTan(angle); + + // velocity along the x axis is controlled by speed (a value from 0 -> 1 + // which is a modifier for the maxSpeed, a constant). the velocity gives + // us the incremental change in x for this unit time + qreal dx = (speed * maxSpeed * elapsed); + + if (arrowDirection == Qt::LeftArrow) + { + e.setX(e.x() - dx); + c.setX(e.x() - opp); + } + else if (arrowDirection == Qt::RightArrow) + { + e.setX(e.x() + dx); + c.setX(e.x() + opp); + } + } + cam->setEye(e); + cam->setCenter(c); + } + elapsed = 0; + if (qIsNull(speed)) + animating = false; +} + +Qt::ArrowType PanController::direction() const +{ + return d->arrowDirection; +} + +void PanController::setDirection(Qt::ArrowType arrow) +{ + Q_ASSERT(arrow == Qt::LeftArrow || arrow == Qt::RightArrow); + d->arrowDirection = arrow; +} + +QGLView *PanController::view() const +{ + return d->view; +} + +void PanController::setView(QGLView *view) +{ + d->view = view; +} + |