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Diffstat (limited to 'src/threed/geometry/qglsphere.cpp')
| -rw-r--r-- | src/threed/geometry/qglsphere.cpp | 243 |
1 files changed, 0 insertions, 243 deletions
diff --git a/src/threed/geometry/qglsphere.cpp b/src/threed/geometry/qglsphere.cpp deleted file mode 100644 index f3b3856b..00000000 --- a/src/threed/geometry/qglsphere.cpp +++ /dev/null @@ -1,243 +0,0 @@ -/**************************************************************************** -** -** 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 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 "qglsphere.h" -#include "qglbuilder.h" -#include <QtCore/qmath.h> - -QT_BEGIN_NAMESPACE - -/*! - \class QGLSphere - \brief The QGLSphere class represents the geometry of a simple sphere in 3D space. - \since 4.8 - \ingroup qt3d - \ingroup qt3d::geometry - - The following example creates a sphere of 2 units in diameter and - draws it at (10, 25, 0) in a QGLPainter: - - \code - QGLBuilder builder; - builder << QGLSphere(2); - QGLSceneNode *node = builder.finalizedSceneNode(); - - painter.translate(10, 25, 0); - node->draw(&painter); - \endcode - - The QGLSphere class specifies positions, normals and 2D texture - co-ordinates for all of the vertices that make up the sphere. - - The texture co-ordinates are fixed at construction time. This - is because constructing the sphere can involve generating additional - vertices which need to interpolate the texture co-ordinates of their - neighboring vertices. - - The default mode of QGLSphere is a "UV sphere", which divides the - sphere up into longitudinal and latitudinal sections. The longitudinal - slices meet at the poles, which in a single unit sphere are defined to - be at (0, 0, +0.5) and (0, 0, -0.5). This choice is the simplest to - texture map as the texture will only distort along the x-axis of the - 2D texture. However the density of vertices is significantly higher at - the poles than it is elsewhere on the sphere and is a poor choice if a - uniform density of pixels from the texture map is required. - - \sa QGLBuilder -*/ - -/*! - \fn QGLSphere::QGLSphere(qreal diameter, int depth) - - Creates a sphere of \a diameter across (default is 1). When the sphere - is recursively subdivided into triangles, it will be subdivided no more - than \a depth times (between 1 and 10, default is 5). -*/ - -/*! - Destroys this sphere object. -*/ -QGLSphere::~QGLSphere() -{ -} - -/*! - \fn qreal QGLSphere::diameter() const - - Returns the diameter of this sphere. The default is 1. - - \sa setDiameter() -*/ - -/*! - \fn void QGLSphere::setDiameter(qreal diameter) - - Sets the diameter of this sphere to \a diameter. - - \sa diameter() -*/ - -/*! - \fn int QGLSphere::subdivisionDepth() const - - Returns the maximum depth when this sphere is subdivided into triangles. - The default is 5. The following picture shows the effect of depth - values between 1 and 10 for a UV sphere: - - \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 - - \sa setSubdivisionDepth() -*/ - -/*! - \fn void QGLSphere::setSubdivisionDepth(int depth) - - Sets the maximum \a depth when this sphere is subdivided into triangles. - - \sa subdivisionDepth() -*/ - -/*! - \relates QGLSphere - - Builds the geometry for \a sphere within the specified - geometry \a builder. -*/ -QGLBuilder& operator<<(QGLBuilder& builder, const QGLSphere& sphere) -{ - qreal radius = sphere.diameter() / 2.0f; - - // Determine the number of slices and stacks to generate. - static int const slicesAndStacks[] = { - 8, 4, - 8, 8, - 16, 8, - 16, 16, - 32, 16, - 32, 32, - 64, 32, - 64, 64, - 128, 64, - 128, 128 - }; - int divisions = sphere.subdivisionDepth(); - if (divisions < 1) - divisions = 1; - else if (divisions > 10) - divisions = 10; - int stacks = slicesAndStacks[divisions * 2 - 1]; - int slices = slicesAndStacks[divisions * 2 - 2]; - - // Precompute sin/cos values for the slices and stacks. - const int maxSlices = 128 + 1; - const int maxStacks = 128 + 1; - qreal sliceSin[maxSlices]; - qreal sliceCos[maxSlices]; - qreal stackSin[maxStacks]; - qreal stackCos[maxStacks]; - for (int slice = 0; slice < slices; ++slice) { - qreal angle = 2 * M_PI * slice / slices; - sliceSin[slice] = qFastSin(angle); - sliceCos[slice] = qFastCos(angle); - } - sliceSin[slices] = sliceSin[0]; // Join first and last slice. - sliceCos[slices] = sliceCos[0]; - for (int stack = 0; stack <= stacks; ++stack) { - qreal angle = M_PI * stack / stacks; - stackSin[stack] = qFastSin(angle); - stackCos[stack] = qFastCos(angle); - } - stackSin[0] = 0.0f; // Come to a point at the poles. - stackSin[stacks] = 0.0f; - - // Create the stacks. - for (int stack = 0; stack < stacks; ++stack) { - QGeometryData prim; - qreal z = radius * stackCos[stack]; - qreal nextz = radius * stackCos[stack + 1]; - qreal s = stackSin[stack]; - qreal nexts = stackSin[stack + 1]; - qreal c = stackCos[stack]; - qreal nextc = stackCos[stack + 1]; - qreal r = radius * s; - qreal nextr = radius * nexts; - for (int slice = 0; slice <= slices; ++slice) { - prim.appendVertex - (QVector3D(nextr * sliceSin[slice], - nextr * sliceCos[slice], nextz)); - prim.appendNormal - (QVector3D(sliceSin[slice] * nexts, - sliceCos[slice] * nexts, nextc)); - prim.appendTexCoord - (QVector2D(1.0f - qreal(slice) / slices, - 1.0f - qreal(stack + 1) / stacks)); - - prim.appendVertex - (QVector3D(r * sliceSin[slice], - r * sliceCos[slice], z)); - prim.appendNormal - (QVector3D(sliceSin[slice] * s, - sliceCos[slice] * s, c)); - prim.appendTexCoord - (QVector2D(1.0f - qreal(slice) / slices, - 1.0f - qreal(stack) / stacks)); - } - builder.addQuadStrip(prim); - } - - return builder; -} - -QT_END_NAMESPACE |