399 lines
12 KiB
C++
399 lines
12 KiB
C++
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/****************************************************************************
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**
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** Copyright (C) 2016 The Qt Company Ltd.
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** Contact: https://www.qt.io/licensing/
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**
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** This file is part of the examples of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:BSD$
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** Commercial License Usage
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** Licensees holding valid commercial Qt licenses may use this file in
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** accordance with the commercial license agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and The Qt Company. For licensing terms
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** and conditions see https://www.qt.io/terms-conditions. For further
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** information use the contact form at https://www.qt.io/contact-us.
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**
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** BSD License Usage
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** Alternatively, you may use this file under the terms of the BSD license
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** as follows:
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**
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** "Redistribution and use in source and binary forms, with or without
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** modification, are permitted provided that the following conditions are
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** met:
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** * Redistributions of source code must retain the above copyright
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** notice, this list of conditions and the following disclaimer.
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** * Redistributions in binary form must reproduce the above copyright
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** notice, this list of conditions and the following disclaimer in
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** the documentation and/or other materials provided with the
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** distribution.
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** * Neither the name of The Qt Company Ltd nor the names of its
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** contributors may be used to endorse or promote products derived
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** from this software without specific prior written permission.
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**
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**
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** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include "qtlogo.h"
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#include <QGLWidget>
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#include <QMatrix4x4>
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#include <QVector3D>
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#include <QOpenGLFunctions_1_1>
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#include <qmath.h>
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static const qreal tee_height = 0.311126;
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static const qreal cross_width = 0.25;
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static const qreal bar_thickness = 0.113137;
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static const qreal logo_depth = 0.10;
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//! [0]
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struct Geometry
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{
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QVector<GLushort> faces;
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QVector<QVector3D> vertices;
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QVector<QVector3D> normals;
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void appendSmooth(const QVector3D &a, const QVector3D &n, int from);
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void appendFaceted(const QVector3D &a, const QVector3D &n);
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void finalize();
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void loadArrays(QOpenGLFunctions_1_1 *functions) const;
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};
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//! [0]
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//! [1]
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class Patch
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{
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public:
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enum Smoothing { Faceted, Smooth };
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Patch(Geometry *);
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void setSmoothing(Smoothing s) { sm = s; }
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void translate(const QVector3D &t);
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void rotate(qreal deg, QVector3D axis);
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void draw(QOpenGLFunctions_1_1 *functions) const;
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void addTri(const QVector3D &a, const QVector3D &b, const QVector3D &c, const QVector3D &n);
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void addQuad(const QVector3D &a, const QVector3D &b, const QVector3D &c, const QVector3D &d);
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GLushort start;
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GLushort count;
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GLushort initv;
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GLfloat faceColor[4];
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QMatrix4x4 mat;
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Smoothing sm;
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Geometry *geom;
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};
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//! [1]
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static inline void qSetColor(float colorVec[], QColor c)
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{
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colorVec[0] = c.redF();
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colorVec[1] = c.greenF();
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colorVec[2] = c.blueF();
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colorVec[3] = c.alphaF();
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}
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void Geometry::loadArrays(QOpenGLFunctions_1_1 *functions) const
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{
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functions->glVertexPointer(3, GL_FLOAT, 0, vertices.constData());
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functions->glNormalPointer(GL_FLOAT, 0, normals.constData());
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}
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void Geometry::finalize()
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{
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// TODO: add vertex buffer uploading here
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// Finish smoothing normals by ensuring accumulated normals are returned
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// to length 1.0.
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for (int i = 0; i < normals.count(); ++i)
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normals[i].normalize();
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}
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void Geometry::appendSmooth(const QVector3D &a, const QVector3D &n, int from)
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{
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// Smooth normals are achieved by averaging the normals for faces meeting
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// at a point. First find the point in geometry already generated
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// (working backwards, since most often the points shared are between faces
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// recently added).
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int v = vertices.count() - 1;
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for ( ; v >= from; --v)
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if (qFuzzyCompare(vertices[v], a))
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break;
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if (v < from) {
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// The vertex was not found so add it as a new one, and initialize
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// its corresponding normal
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v = vertices.count();
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vertices.append(a);
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normals.append(n);
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} else {
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// Vert found, accumulate normals into corresponding normal slot.
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// Must call finalize once finished accumulating normals
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normals[v] += n;
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}
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// In both cases (found or not) reference the vertex via its index
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faces.append(v);
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}
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void Geometry::appendFaceted(const QVector3D &a, const QVector3D &n)
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{
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// Faceted normals are achieved by duplicating the vertex for every
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// normal, so that faces meeting at a vertex get a sharp edge.
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int v = vertices.count();
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vertices.append(a);
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normals.append(n);
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faces.append(v);
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}
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Patch::Patch(Geometry *g)
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: start(g->faces.count())
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, count(0)
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, initv(g->vertices.count())
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, sm(Patch::Smooth)
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, geom(g)
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{
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qSetColor(faceColor, QColor(Qt::darkGray));
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}
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void Patch::rotate(qreal deg, QVector3D axis)
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{
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mat.rotate(deg, axis);
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}
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void Patch::translate(const QVector3D &t)
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{
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mat.translate(t);
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}
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//! [2]
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void Patch::draw(QOpenGLFunctions_1_1 *functions) const
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{
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functions->glPushMatrix();
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functions->glMultMatrixf(mat.constData());
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functions->glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, faceColor);
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const GLushort *indices = geom->faces.constData();
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functions->glDrawElements(GL_TRIANGLES, count, GL_UNSIGNED_SHORT, indices + start);
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functions->glPopMatrix();
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}
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//! [2]
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void Patch::addTri(const QVector3D &a, const QVector3D &b, const QVector3D &c, const QVector3D &n)
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{
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QVector3D norm = n.isNull() ? QVector3D::normal(a, b, c) : n;
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if (sm == Smooth) {
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geom->appendSmooth(a, norm, initv);
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geom->appendSmooth(b, norm, initv);
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geom->appendSmooth(c, norm, initv);
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} else {
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geom->appendFaceted(a, norm);
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geom->appendFaceted(b, norm);
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geom->appendFaceted(c, norm);
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}
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count += 3;
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}
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void Patch::addQuad(const QVector3D &a, const QVector3D &b, const QVector3D &c, const QVector3D &d)
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{
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QVector3D norm = QVector3D::normal(a, b, c);
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if (sm == Smooth) {
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addTri(a, b, c, norm);
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addTri(a, c, d, norm);
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} else {
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// If faceted share the two common vertices
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addTri(a, b, c, norm);
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int k = geom->vertices.count();
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geom->appendSmooth(a, norm, k);
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geom->appendSmooth(c, norm, k);
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geom->appendFaceted(d, norm);
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count += 3;
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}
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}
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static inline QVector<QVector3D> extrude(const QVector<QVector3D> &vertices, qreal depth)
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{
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QVector<QVector3D> extr = vertices;
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for (int v = 0; v < extr.count(); ++v)
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extr[v].setZ(extr[v].z() - depth);
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return extr;
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}
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class Rectoid
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{
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public:
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void translate(const QVector3D &t)
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{
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for (int i = 0; i < parts.count(); ++i)
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parts[i]->translate(t);
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}
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void rotate(qreal deg, QVector3D axis)
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{
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for (int i = 0; i < parts.count(); ++i)
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parts[i]->rotate(deg, axis);
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}
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// No special Rectoid destructor - the parts are fetched out of this member
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// variable, and destroyed by the new owner
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QList<Patch *> parts;
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};
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class RectPrism : public Rectoid
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{
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public:
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RectPrism(Geometry *g, qreal width, qreal height, qreal depth);
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};
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RectPrism::RectPrism(Geometry *g, qreal width, qreal height, qreal depth)
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{
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enum { bl, br, tr, tl };
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Patch *fb = new Patch(g);
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fb->setSmoothing(Patch::Faceted);
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// front face
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QVector<QVector3D> r(4);
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r[br].setX(width);
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r[tr].setX(width);
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r[tr].setY(height);
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r[tl].setY(height);
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QVector3D adjToCenter(-width / 2.0, -height / 2.0, depth / 2.0);
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for (int i = 0; i < 4; ++i)
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r[i] += adjToCenter;
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fb->addQuad(r[bl], r[br], r[tr], r[tl]);
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// back face
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QVector<QVector3D> s = extrude(r, depth);
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fb->addQuad(s[tl], s[tr], s[br], s[bl]);
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// side faces
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Patch *sides = new Patch(g);
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sides->setSmoothing(Patch::Faceted);
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sides->addQuad(s[bl], s[br], r[br], r[bl]);
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sides->addQuad(s[br], s[tr], r[tr], r[br]);
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sides->addQuad(s[tr], s[tl], r[tl], r[tr]);
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sides->addQuad(s[tl], s[bl], r[bl], r[tl]);
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parts << fb << sides;
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}
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class RectTorus : public Rectoid
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{
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public:
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RectTorus(Geometry *g, qreal iRad, qreal oRad, qreal depth, int numSectors);
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};
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RectTorus::RectTorus(Geometry *g, qreal iRad, qreal oRad, qreal depth, int k)
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{
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QVector<QVector3D> inside;
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QVector<QVector3D> outside;
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for (int i = 0; i < k; ++i) {
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qreal angle = (i * 2 * M_PI) / k;
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inside << QVector3D(iRad * qSin(angle), iRad * qCos(angle), depth / 2.0);
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outside << QVector3D(oRad * qSin(angle), oRad * qCos(angle), depth / 2.0);
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}
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inside << QVector3D(0.0, iRad, 0.0);
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outside << QVector3D(0.0, oRad, 0.0);
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QVector<QVector3D> in_back = extrude(inside, depth);
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QVector<QVector3D> out_back = extrude(outside, depth);
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// Create front, back and sides as separate patches so that smooth normals
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// are generated for the curving sides, but a faceted edge is created between
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// sides and front/back
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Patch *front = new Patch(g);
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for (int i = 0; i < k; ++i)
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front->addQuad(outside[i], inside[i],
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inside[(i + 1) % k], outside[(i + 1) % k]);
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Patch *back = new Patch(g);
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for (int i = 0; i < k; ++i)
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back->addQuad(in_back[i], out_back[i],
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out_back[(i + 1) % k], in_back[(i + 1) % k]);
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Patch *is = new Patch(g);
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for (int i = 0; i < k; ++i)
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is->addQuad(in_back[i], in_back[(i + 1) % k],
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inside[(i + 1) % k], inside[i]);
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Patch *os = new Patch(g);
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for (int i = 0; i < k; ++i)
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os->addQuad(out_back[(i + 1) % k], out_back[i],
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outside[i], outside[(i + 1) % k]);
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parts << front << back << is << os;
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}
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QtLogo::QtLogo(QObject *parent, int divisions, qreal scale)
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: QObject(parent)
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, geom(new Geometry())
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{
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buildGeometry(divisions, scale);
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}
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QtLogo::~QtLogo()
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{
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qDeleteAll(parts);
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delete geom;
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}
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void QtLogo::setColor(QColor c)
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{
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for (int i = 0; i < parts.count(); ++i)
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qSetColor(parts[i]->faceColor, c);
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}
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//! [3]
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void QtLogo::buildGeometry(int divisions, qreal scale)
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{
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qreal cw = cross_width * scale;
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qreal bt = bar_thickness * scale;
|
||
|
|
qreal ld = logo_depth * scale;
|
||
|
|
qreal th = tee_height *scale;
|
||
|
|
|
||
|
|
RectPrism cross(geom, cw, bt, ld);
|
||
|
|
RectPrism stem(geom, bt, th, ld);
|
||
|
|
|
||
|
|
QVector3D z(0.0, 0.0, 1.0);
|
||
|
|
cross.rotate(45.0, z);
|
||
|
|
stem.rotate(45.0, z);
|
||
|
|
|
||
|
|
qreal stem_downshift = (th + bt) / 2.0;
|
||
|
|
stem.translate(QVector3D(0.0, -stem_downshift, 0.0));
|
||
|
|
|
||
|
|
RectTorus body(geom, 0.20, 0.30, 0.1, divisions);
|
||
|
|
|
||
|
|
parts << stem.parts << cross.parts << body.parts;
|
||
|
|
|
||
|
|
geom->finalize();
|
||
|
|
}
|
||
|
|
//! [3]
|
||
|
|
|
||
|
|
//! [4]
|
||
|
|
void QtLogo::draw(QOpenGLFunctions_1_1 *functions) const
|
||
|
|
{
|
||
|
|
geom->loadArrays(functions);
|
||
|
|
|
||
|
|
functions->glEnableClientState(GL_VERTEX_ARRAY);
|
||
|
|
functions->glEnableClientState(GL_NORMAL_ARRAY);
|
||
|
|
|
||
|
|
for (int i = 0; i < parts.count(); ++i)
|
||
|
|
parts[i]->draw(functions);
|
||
|
|
|
||
|
|
functions->glDisableClientState(GL_VERTEX_ARRAY);
|
||
|
|
functions->glDisableClientState(GL_NORMAL_ARRAY);
|
||
|
|
}
|
||
|
|
//! [4]
|