qgraphicstransform.cpp

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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
 
#include "qgraphicstransform.h"
#include "qgraphicsitem_p.h"
#include "qgraphicstransform_p.h"
#include <QDebug>
#include <QtCore/qmath.h>
#include <QtCore/qnumeric.h>
 
QT_BEGIN_NAMESPACE
 
QGraphicsTransformPrivate::~QGraphicsTransformPrivate()
{
}
 
void QGraphicsTransformPrivate::setItem(QGraphicsItem *i)
{
    if (item == i)
        return;
 
    if (item) {
        Q_Q(QGraphicsTransform);
        QGraphicsItemPrivate *d_ptr = item->d_ptr.data();
 
        item->prepareGeometryChange();
        Q_ASSERT(d_ptr->transformData);
        d_ptr->transformData->graphicsTransforms.removeAll(q);
        d_ptr->dirtySceneTransform = 1;
        item = nullptr;
    }
 
    item = i;
}
 
void QGraphicsTransformPrivate::updateItem(QGraphicsItem *item)
{
    item->prepareGeometryChange();
    item->d_ptr->dirtySceneTransform = 1;
}
 
QGraphicsTransform::QGraphicsTransform(QObject *parent)
    : QObject(*new QGraphicsTransformPrivate, parent)
{
}
 
QGraphicsTransform::~QGraphicsTransform()
{
    Q_D(QGraphicsTransform);
    d->setItem(nullptr);
}
 
QGraphicsTransform::QGraphicsTransform(QGraphicsTransformPrivate &p, QObject *parent)
    : QObject(p, parent)
{
}
 
void QGraphicsTransform::update()
{
    Q_D(QGraphicsTransform);
    if (d->item)
        d->updateItem(d->item);
}
 
class QGraphicsScalePrivate : public QGraphicsTransformPrivate
{
public:
    QGraphicsScalePrivate()
        : xScale(1), yScale(1), zScale(1) {}
    QVector3D origin;
    qreal xScale;
    qreal yScale;
    qreal zScale;
};
 
QGraphicsScale::QGraphicsScale(QObject *parent)
    : QGraphicsTransform(*new QGraphicsScalePrivate, parent)
{
}
 
QGraphicsScale::~QGraphicsScale()
{
}
 
QVector3D QGraphicsScale::origin() const
{
    Q_D(const QGraphicsScale);
    return d->origin;
}
void QGraphicsScale::setOrigin(const QVector3D &point)
{
    Q_D(QGraphicsScale);
    if (d->origin == point)
        return;
    d->origin = point;
    update();
    emit originChanged();
}
 
qreal QGraphicsScale::xScale() const
{
    Q_D(const QGraphicsScale);
    return d->xScale;
}
void QGraphicsScale::setXScale(qreal scale)
{
    Q_D(QGraphicsScale);
    if (d->xScale == scale)
        return;
    d->xScale = scale;
    update();
    emit xScaleChanged();
    emit scaleChanged();
}
 
qreal QGraphicsScale::yScale() const
{
    Q_D(const QGraphicsScale);
    return d->yScale;
}
void QGraphicsScale::setYScale(qreal scale)
{
    Q_D(QGraphicsScale);
    if (d->yScale == scale)
        return;
    d->yScale = scale;
    update();
    emit yScaleChanged();
    emit scaleChanged();
}
 
qreal QGraphicsScale::zScale() const
{
    Q_D(const QGraphicsScale);
    return d->zScale;
}
void QGraphicsScale::setZScale(qreal scale)
{
    Q_D(QGraphicsScale);
    if (d->zScale == scale)
        return;
    d->zScale = scale;
    update();
    emit zScaleChanged();
    emit scaleChanged();
}
 
void QGraphicsScale::applyTo(QMatrix4x4 *matrix) const
{
    Q_D(const QGraphicsScale);
    matrix->translate(d->origin);
    matrix->scale(d->xScale, d->yScale, d->zScale);
    matrix->translate(-d->origin);
}
 
class QGraphicsRotationPrivate : public QGraphicsTransformPrivate
{
public:
    QGraphicsRotationPrivate()
        : angle(0), axis(0, 0, 1) {}
    QVector3D origin;
    qreal angle;
    QVector3D axis;
};
 
QGraphicsRotation::QGraphicsRotation(QObject *parent)
    : QGraphicsTransform(*new QGraphicsRotationPrivate, parent)
{
}
 
QGraphicsRotation::~QGraphicsRotation()
{
}
 
QVector3D QGraphicsRotation::origin() const
{
    Q_D(const QGraphicsRotation);
    return d->origin;
}
void QGraphicsRotation::setOrigin(const QVector3D &point)
{
    Q_D(QGraphicsRotation);
    if (d->origin == point)
        return;
    d->origin = point;
    update();
    emit originChanged();
}
 
qreal QGraphicsRotation::angle() const
{
    Q_D(const QGraphicsRotation);
    return d->angle;
}
void QGraphicsRotation::setAngle(qreal angle)
{
    Q_D(QGraphicsRotation);
    if (d->angle == angle)
        return;
    d->angle = angle;
    update();
    emit angleChanged();
}
 
QVector3D QGraphicsRotation::axis() const
{
    Q_D(const QGraphicsRotation);
    return d->axis;
}
void QGraphicsRotation::setAxis(const QVector3D &axis)
{
    Q_D(QGraphicsRotation);
    if (d->axis == axis)
         return;
    d->axis = axis;
    update();
    emit axisChanged();
}
 
void QGraphicsRotation::setAxis(Qt::Axis axis)
{
    switch (axis)
    {
    case Qt::XAxis:
        setAxis(QVector3D(1, 0, 0));
        break;
    case Qt::YAxis:
        setAxis(QVector3D(0, 1, 0));
        break;
    case Qt::ZAxis:
        setAxis(QVector3D(0, 0, 1));
        break;
    }
}
 
void QGraphicsRotation::applyTo(QMatrix4x4 *matrix) const
{
    Q_D(const QGraphicsRotation);
 
    if (d->angle == 0. || d->axis.isNull() || qIsNaN(d->angle))
        return;
 
    matrix->translate(d->origin);
    matrix->projectedRotate(d->angle, d->axis.x(), d->axis.y(), d->axis.z());
    matrix->translate(-d->origin);
}
 
QT_END_NAMESPACE
 
#include "moc_qgraphicstransform.cpp"