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/****************************************************************************
**
** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: http://www.qt-project.org/
**
** This file is part of the QtQuick3D module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** GNU Lesser General Public License Usage
** 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.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU General
** Public License version 3.0 as published by the Free Software Foundation
** and appearing in the file LICENSE.GPL included in the packaging of this
** file. Please review the following information to ensure the GNU General
** Public License version 3.0 requirements will be met:
** http://www.gnu.org/copyleft/gpl.html.
**
** Other Usage
** Alternatively, this file may be used in accordance with the terms and
** conditions contained in a signed written agreement between you and Nokia.
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "sphere.h"
#include "qglbuilder.h"
#include "qglsphere.h"
QT_BEGIN_NAMESPACE
/*!
\qmlclass Sphere Sphere
\brief The Sphere item represents a simple UV-sphere in 3D space.
\since 4.8
\ingroup qt3d::qml3d::shapes
\inherits Item3D
The Sphere element in QML provides a simple way to create a sphere
object, usually for testing material effects. For example,
the following QML code displays a green sphere of radius 1.5,
centered on the origin:
\code
Sphere {
radius: 1.5
effect: Effect {
color: "#aaca00"
}
}
\endcode
The Sphere element is part of the \c{Qt3D.Shapes} namespace,
so the following must appear at the top of any QML file that
references it:
\code
import Qt3D.Shapes 1.0
\endcode
By default, the sphere is aligned to lie along the Z axis.
The \l axis property can change this to either the X or the Y
axis, as shown in the following example:
\code
Sphere {
scale: 1.5
levelOfDetail: 6
axis: Qt.YAxis
effect: Effect { texture: "moon-texture.jpg" }
}
\endcode
\image moon-screenshot.png
\sa Item3D
*/
/*!
\internal
*/
Sphere::Sphere(QObject *parent)
: QDeclarativeItem3D(parent)
, m_radius(1.0f)
, m_lod(-1)
, m_axis(Qt::ZAxis)
{
setLevelOfDetail(5);
}
/*!
\qmlproperty real Sphere::radius
This property defines the radius of the sphere. The default
value is 1.
*/
void Sphere::setRadius(qreal radius)
{
if (m_radius != radius) {
m_radius = radius;
emit radiusChanged();
update();
}
}
/*!
\qmlproperty int Sphere::levelOfDetail
This property defines the level of detail, between 1 and 10,
which controls the number of triangles that are generated to
render the surface of the sphere. Values outside the range
1 to 10 will be clamped.
The default value is 5. An increase in 1 in level of detail
doubles the number of triangles. The following picture shows
the effect of level of detail values between 1 and 10:
\image sphere-detail.png
\table
\header \o Level of Detail \o Number of Triangles
\row \o 1 \o 64
\row \o 2 \o 128
\row \o 3 \o 256
\row \o 4 \o 512
\row \o 5 \o 1024
\row \o 6 \o 2048
\row \o 7 \o 4096
\row \o 8 \o 8192
\row \o 9 \o 16384
\row \o 10 \o 32768
\endtable
*/
void Sphere::setLevelOfDetail(int lod)
{
if (lod < 1)
{
lod = 1;
}
else
{
if (lod > 10)
lod = 10;
}
if (m_lod != lod) {
m_lod = lod;
updateGeometry();
emit levelOfDetailChanged();
update();
}
}
/*!
\qmlproperty enumeration Sphere::axis
This property defines the axis that the sphere lies along.
The default is Qt.ZAxis. The other supported values are
Qt.XAxis and Qt.YAxis. This provides a simple method to
orient the sphere in the desired direction.
*/
void Sphere::setAxis(Qt::Axis axis)
{
if (m_axis != axis) {
m_axis = axis;
emit axisChanged();
update();
}
}
/*!
\internal
*/
void Sphere::updateGeometry()
{
// Convert the level of detail into a depth value for QGLSphere.
// We cache a maximum of 10 levels of detail for lod animations.
// Create a new geometry node for this level of detail if necessary.
QGLSceneNode *geometry = m_lodGeometry.value(m_lod, 0);
if (!geometry) {
QGLBuilder builder;
builder.newSection(QGL::Faceted);
builder << QGLSphere(2.0f, m_lod);
geometry = builder.finalizedSceneNode();
geometry->setParent(this);
m_lodGeometry.insert(m_lod, geometry);
}
}
void Sphere::drawItem(QGLPainter *painter)
{
// Set the radius as a scale on the modelview transformation.
// This way, we don't have to regenerate the geometry every
// frame if the radius is being animated. Also rotate the
// geometry into the correct axis orientation.
if (m_radius != 1.0f || m_axis != Qt::ZAxis) {
painter->modelViewMatrix().push();
if (m_radius != 1.0f)
painter->modelViewMatrix().scale(m_radius);
if (m_axis == Qt::XAxis)
painter->modelViewMatrix().rotate(90.0f, 0.0f, 1.0f, 0.0);
else if (m_axis == Qt::YAxis)
painter->modelViewMatrix().rotate(-90.0f, 1.0f, 0.0f, 0.0);
}
// Draw the geometry.
QGLSceneNode *geometry = m_lodGeometry.value(m_lod, 0);
geometry->draw(painter);
// Restore the original modelview.
if (m_radius != 1.0f || m_axis != Qt::ZAxis)
painter->modelViewMatrix().pop();
}
QT_END_NAMESPACE
|
