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/****************************************************************************
**
** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/
**
** This file is part of the Qt3D examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** You may use this file under the terms of the BSD license as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
** * Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** * Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in
** the documentation and/or other materials provided with the
** distribution.
** * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor
** the names of its contributors may be used to endorse or promote
** products derived from this software without specific prior written
** permission.
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "geometry.h"
#include "qgltexture2d.h"
#include "qglmaterialcollection.h"
#include "qtriangle3d.h"
#include <QImage>
#include <QPainter>
// icosahedron is defined by phi, derived from the golden section
// http://en.wikipedia.org/wiki/Icosahedron#Cartesian_coordinates
const float phi = 1.618033988749894848f;
Geometry::Geometry(QObject *parent, QGLMaterialCollection *materials)
: QGLSceneNode(parent)
{
setPalette(materials);
float ico[12][3] = {
{ 0.0f, 1.0f, phi }, // A - 0
{ 0.0f, 1.0f, -phi }, // B - 1
{ 0.0f, -1.0f, phi }, // C - 2
{ 0.0f, -1.0f, -phi }, // D - 3
{ 1.0f, phi, 0.0f }, // E - 4
{ 1.0f, -phi, 0.0f }, // F - 5
{ -1.0f, phi, 0.0f }, // G - 6
{ -1.0f, -phi, 0.0f }, // H - 7
{ phi, 0.0f, 1.0f }, // I - 8
{ phi, 0.0f, -1.0f }, // J - 9
{ -phi, 0.0f, 1.0f }, // K - 10
{ -phi, 0.0f, -1.0f } // L - 11
};
int face[20][3] = {
{ 4, 0, 8 }, // E-A-I
{ 6, 0, 4 }, // G-A-E
{ 6, 10, 0 }, // G-K-A
{ 11, 10, 6 }, // L-K-G
{ 0, 2, 8 }, // A-C-I
{ 10, 2, 0 }, // K-C-A
{ 10, 7, 2 }, // K-H-C
{ 11, 7, 10 }, // L-H-K
{ 2, 5, 8 }, // C-F-I
{ 7, 5, 2 }, // H-F-C
{ 7, 3, 5 }, // H-D-F
{ 11, 3, 7 }, // L-D-H
{ 5, 9, 8 }, // F-J-I
{ 3, 9, 5 }, // D-J-F
{ 3, 1, 9 }, // D-B-J
{ 11, 1, 3 }, // L-B-D
{ 9, 4, 8 }, // J-E-I
{ 1, 4, 9 }, // B-E-J
{ 1, 6, 4 }, // B-G-E
{ 11, 6, 1 } // L-G-B
};
const float u0 = 0.0f;
const float u1 = 0.173205081f;
const float u2 = 0.346410162f;
const float u3 = 0.519615242f;
const float u4 = 0.692820323f;
const float u5 = 0.866025402f;
const float v0 = 0.0f;
const float v1 = 0.111111111f;
const float v2 = 0.222222222f;
const float v3 = 0.333333333f;
const float v4 = 0.444444444f;
const float v5 = 0.555555555f;
const float v6 = 0.666666666f;
const float v7 = 0.777777777f;
const float v8 = 0.888888888f;
const float v9 = 1.0f;
float tex[20][3][2] = {
{ { u0, v1 }, { u1, v2 }, { u1, v0 } }, // E-A-I
{ { u0, v3 }, { u1, v2 }, { u0, v1 } }, // G-A-E
{ { u0, v3 }, { u1, v4 }, { u1, v2 } }, // G-K-A
{ { u0, v5 }, { u1, v4 }, { u0, v3 } }, // L-K-G
{ { u1, v2 }, { u2, v3 }, { u2, v1 } }, // A-C-I
{ { u1, v4 }, { u2, v3 }, { u1, v2 } }, // K-C-A
{ { u1, v4 }, { u2, v5 }, { u2, v3 } }, // K-H-C
{ { u1, v6 }, { u2, v5 }, { u1, v4 } }, // L-H-K
{ { u2, v3 }, { u3, v4 }, { u3, v2 } }, // C-F-I
{ { u2, v5 }, { u3, v4 }, { u2, v3 } }, // H-F-C
{ { u2, v5 }, { u3, v6 }, { u3, v4 } }, // H-D-F
{ { u2, v7 }, { u3, v6 }, { u2, v5 } }, // L-D-H
{ { u3, v4 }, { u4, v5 }, { u4, v3 } }, // F-J-I
{ { u3, v6 }, { u4, v5 }, { u3, v4 } }, // D-J-F
{ { u3, v6 }, { u4, v7 }, { u4, v5 } }, // D-B-J
{ { u3, v8 }, { u4, v7 }, { u3, v6 } }, // L-B-D
{ { u4, v5 }, { u5, v6 }, { u5, v4 } }, // J-E-I
{ { u4, v7 }, { u5, v6 }, { u4, v5 } }, // B-E-J
{ { u4, v7 }, { u5, v8 }, { u5, v6 } }, // B-G-E
{ { u4, v9 }, { u5, v8 }, { u4, v7 } } // L-G-B
};
const int imgSize = 1024;
const int txtSize = 36;
QImage uv(imgSize, imgSize, QImage::Format_ARGB32);
uv.fill(qRgba(196, 196, 196, 196));
QPainter painter;
painter.begin(&uv);
painter.setRenderHint(QPainter::Antialiasing);
QPen pen = painter.pen();
pen.setWidth(2.0);
painter.setPen(pen);
QFont font = painter.font();
font.setPointSize(txtSize);
painter.setFont(font);
QFontMetrics metrics = painter.fontMetrics();
QGLBuilder b;
b.newSection();
b.currentNode()->setEffect(QGL::LitDecalTexture2D);
for (int ix = 0; ix < 20; ++ix)
{
QVector3D v0(ico[face[ix][0]][0], ico[face[ix][0]][1], ico[face[ix][0]][2]);
QVector3D v1(ico[face[ix][1]][0], ico[face[ix][1]][1], ico[face[ix][1]][2]);
QVector3D v2(ico[face[ix][2]][0], ico[face[ix][2]][1], ico[face[ix][2]][2]);
QVector2D t0(tex[ix][0][0], tex[ix][0][1]);
QVector2D t1(tex[ix][1][0], tex[ix][1][1]);
QVector2D t2(tex[ix][2][0], tex[ix][2][1]);
// scale up and flip to draw the texture
QVector2D tv0 = t0 * static_cast<float>(imgSize);
QVector2D tv1 = t1 * static_cast<float>(imgSize);
QVector2D tv2 = t2 * static_cast<float>(imgSize);
painter.setPen(QColor("darkblue"));
painter.drawLine(tv0.toPointF(), tv1.toPointF());
painter.drawLine(tv1.toPointF(), tv2.toPointF());
painter.drawLine(tv2.toPointF(), tv0.toPointF());
QTriangle3D tri(tv0, tv1, tv2);
QVector3D cen = tri.center();
QString n = QString::number(ix+1);
painter.setPen(QColor("darkgreen"));
painter.drawText(QPointF(cen.x() - metrics.width(n) / 2.0, cen.y() + 3.0), n);
// Qt's coordinate system is upside down. I'm ok with that.
t0.setY(1.0f - t0.y());
t1.setY(1.0f - t1.y());
t2.setY(1.0f - t2.y());
QGeometryData op;
op.appendVertex(v0, v1, v2);
op.appendTexCoord(t0, t1, t2);
b.addTriangles(op);
}
painter.end();
QGLMaterial *mat = new QGLMaterial;
mat->setAmbientColor(QColor(32, 64, 196));
mat->setDiffuseColor(QColor(32, 32, 32));
QGLTexture2D *texture = new QGLTexture2D(mat);
texture->setImage(uv);
mat->setTexture(texture);
setMaterial(mat);
QGLSceneNode *n = b.finalizedSceneNode();
addNode(n);
}
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