/****************************************************************************+
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**+
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** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).+
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** All rights reserved.+
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** Contact: Nokia Corporation (qt-info@nokia.com)+
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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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** $QT_BEGIN_LICENSE:LGPL$+
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** No Commercial Usage+
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** This file contains pre-release code and may not be distributed.+
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** You may use this file in accordance with the terms and conditions+
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** contained in the Technology Preview License Agreement accompanying+
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** this package.+
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**+
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** GNU Lesser General Public License Usage+
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** Alternatively, this file may be used under the terms of the GNU Lesser+
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** General Public License version 2.1 as published by the Free Software+
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** Foundation and appearing in the file LICENSE.LGPL included in the+
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** packaging of this file.  Please review the following information to+
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** ensure the GNU Lesser General Public License version 2.1 requirements+
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** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.+
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**+
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** In addition, as a special exception, Nokia gives you certain additional+
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** rights.  These rights are described in the Nokia Qt LGPL Exception+
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.+
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**+
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** If you have questions regarding the use of this file, please contact+
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** Nokia at qt-info@nokia.com.+
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**+
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**+
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**+
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**+
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**+
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**+
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**+
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**+
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** $QT_END_LICENSE$+
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**+
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****************************************************************************/+
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+
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#include <QtGui>+
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#include <QtOpenGL>+
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+
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#include <math.h>+
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+
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#include "glwidget.h"+
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#include "qtlogo.h"+
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+
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#ifndef GL_MULTISAMPLE+
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#define GL_MULTISAMPLE  0x809D+
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#endif+
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+
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//! [0]+
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GLWidget::GLWidget(QWidget *parent)+
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    : QGLWidget(QGLFormat(QGL::SampleBuffers), parent)+
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{+
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    logo = 0;+
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    xRot = 0;+
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    yRot = 0;+
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    zRot = 0;+
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+
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    qtGreen = QColor::fromCmykF(0.40, 0.0, 1.0, 0.0);+
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    qtPurple = QColor::fromCmykF(0.39, 0.39, 0.0, 0.0);+
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}+
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//! [0]+
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+
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//! [1]+
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GLWidget::~GLWidget()+
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{+
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}+
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//! [1]+
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+
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//! [2]+
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QSize GLWidget::minimumSizeHint() const+
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{+
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    return QSize(50, 50);+
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}+
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//! [2]+
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+
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//! [3]+
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QSize GLWidget::sizeHint() const+
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//! [3] //! [4]+
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{+
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    return QSize(400, 400);+
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}+
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//! [4]+
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+
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static void qNormalizeAngle(int &angle)+
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{+
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    while (angle < 0)+
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        angle += 360 * 16;+
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    while (angle > 360 * 16)+
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        angle -= 360 * 16;+
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}+
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+
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//! [5]+
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void GLWidget::setXRotation(int angle)+
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{+
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    qNormalizeAngle(angle);+
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    if (angle != xRot) {+
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        xRot = angle;+
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        emit xRotationChanged(angle);+
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        updateGL();+
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    }+
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}+
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//! [5]+
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+
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void GLWidget::setYRotation(int angle)+
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{+
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    qNormalizeAngle(angle);+
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    if (angle != yRot) {+
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        yRot = angle;+
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        emit yRotationChanged(angle);+
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        updateGL();+
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    }+
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}+
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+
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void GLWidget::setZRotation(int angle)+
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{+
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    qNormalizeAngle(angle);+
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    if (angle != zRot) {+
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        zRot = angle;+
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        emit zRotationChanged(angle);+
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        updateGL();+
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    }+
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}+
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+
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//! [6]+
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void GLWidget::initializeGL()+
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{+
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    qglClearColor(qtPurple.dark());+
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+
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    logo = new QtLogo(this, 64);+
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    logo->setColor(qtGreen.dark());+
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+
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    glEnable(GL_DEPTH_TEST);+
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    glEnable(GL_CULL_FACE);+
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    glShadeModel(GL_SMOOTH);+
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    glEnable(GL_LIGHTING);+
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    glEnable(GL_LIGHT0);+
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    glEnable(GL_MULTISAMPLE);+
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    static GLfloat lightPosition[4] = { 0.5, 5.0, 7.0, 1.0 };+
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    glLightfv(GL_LIGHT0, GL_POSITION, lightPosition);+
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}+
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//! [6]+
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+
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//! [7]+
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void GLWidget::paintGL()+
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{+
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    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);+
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    glLoadIdentity();+
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    glTranslatef(0.0, 0.0, -10.0);+
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    glRotatef(xRot / 16.0, 1.0, 0.0, 0.0);+
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    glRotatef(yRot / 16.0, 0.0, 1.0, 0.0);+
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    glRotatef(zRot / 16.0, 0.0, 0.0, 1.0);+
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    logo->draw();+
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}+
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//! [7]+
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+
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//! [8]+
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void GLWidget::resizeGL(int width, int height)+
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{+
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    int side = qMin(width, height);+
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    glViewport((width - side) / 2, (height - side) / 2, side, side);+
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+
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    glMatrixMode(GL_PROJECTION);+
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    glLoadIdentity();+
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#ifdef QT_OPENGL_ES_1+
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    glOrthof(-0.5, +0.5, -0.5, +0.5, 4.0, 15.0);+
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#else+
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    glOrtho(-0.5, +0.5, -0.5, +0.5, 4.0, 15.0);+
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#endif+
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    glMatrixMode(GL_MODELVIEW);+
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}+
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//! [8]+
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+
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//! [9]+
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void GLWidget::mousePressEvent(QMouseEvent *event)+
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{+
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    lastPos = event->pos();+
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}+
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//! [9]+
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+
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//! [10]+
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void GLWidget::mouseMoveEvent(QMouseEvent *event)+
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{+
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    int dx = event->x() - lastPos.x();+
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    int dy = event->y() - lastPos.y();+
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+
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    if (event->buttons() & Qt::LeftButton) {+
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        setXRotation(xRot + 8 * dy);+
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        setYRotation(yRot + 8 * dx);+
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    } else if (event->buttons() & Qt::RightButton) {+
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        setXRotation(xRot + 8 * dy);+
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        setZRotation(zRot + 8 * dx);+
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    }+
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    lastPos = event->pos();+
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}+
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//! [10]+
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