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+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the examples of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, 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 1.0, 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.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <QtGui>
+#include <QtOpenGL>
+#include <stdlib.h>
+
+#include <math.h>
+
+#include "bubble.h"
+#include "glwidget.h"
+
+#ifndef GL_MULTISAMPLE
+#define GL_MULTISAMPLE 0x809D
+#endif
+
+//! [0]
+GLWidget::GLWidget(QWidget *parent)
+ : QGLWidget(QGLFormat(QGL::SampleBuffers), parent)
+{
+ QTime midnight(0, 0, 0);
+ qsrand(midnight.secsTo(QTime::currentTime()));
+
+ object = 0;
+ xRot = 0;
+ yRot = 0;
+ zRot = 0;
+
+ trolltechGreen = QColor::fromCmykF(0.40, 0.0, 1.0, 0.0);
+ trolltechPurple = QColor::fromCmykF(0.39, 0.39, 0.0, 0.0);
+
+ animationTimer.setSingleShot(false);
+ connect(&animationTimer, SIGNAL(timeout()), this, SLOT(animate()));
+ animationTimer.start(25);
+
+ setAutoFillBackground(false);
+ setMinimumSize(200, 200);
+ setWindowTitle(tr("Overpainting a Scene"));
+}
+//! [0]
+
+//! [1]
+GLWidget::~GLWidget()
+{
+ makeCurrent();
+ glDeleteLists(object, 1);
+}
+//! [1]
+
+void GLWidget::setXRotation(int angle)
+{
+ normalizeAngle(&angle);
+ if (angle != xRot)
+ xRot = angle;
+}
+
+void GLWidget::setYRotation(int angle)
+{
+ normalizeAngle(&angle);
+ if (angle != yRot)
+ yRot = angle;
+}
+
+void GLWidget::setZRotation(int angle)
+{
+ normalizeAngle(&angle);
+ if (angle != zRot)
+ zRot = angle;
+}
+
+//! [2]
+void GLWidget::initializeGL()
+{
+ object = makeObject();
+}
+//! [2]
+
+void GLWidget::mousePressEvent(QMouseEvent *event)
+{
+ lastPos = event->pos();
+}
+
+void GLWidget::mouseMoveEvent(QMouseEvent *event)
+{
+ int dx = event->x() - lastPos.x();
+ int dy = event->y() - lastPos.y();
+
+ if (event->buttons() & Qt::LeftButton) {
+ setXRotation(xRot + 8 * dy);
+ setYRotation(yRot + 8 * dx);
+ } else if (event->buttons() & Qt::RightButton) {
+ setXRotation(xRot + 8 * dy);
+ setZRotation(zRot + 8 * dx);
+ }
+ lastPos = event->pos();
+}
+
+void GLWidget::paintEvent(QPaintEvent *event)
+{
+ makeCurrent();
+//! [4]
+ glMatrixMode(GL_MODELVIEW);
+ glPushMatrix();
+//! [4]
+
+//! [6]
+ qglClearColor(trolltechPurple.dark());
+ glShadeModel(GL_SMOOTH);
+ glEnable(GL_DEPTH_TEST);
+ glEnable(GL_CULL_FACE);
+ glEnable(GL_LIGHTING);
+ glEnable(GL_LIGHT0);
+ glEnable(GL_MULTISAMPLE);
+ static GLfloat lightPosition[4] = { 0.5, 5.0, 7.0, 1.0 };
+ glLightfv(GL_LIGHT0, GL_POSITION, lightPosition);
+
+ setupViewport(width(), height());
+//! [6]
+
+//! [7]
+ glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+ glLoadIdentity();
+ glTranslated(0.0, 0.0, -10.0);
+ glRotated(xRot / 16.0, 1.0, 0.0, 0.0);
+ glRotated(yRot / 16.0, 0.0, 1.0, 0.0);
+ glRotated(zRot / 16.0, 0.0, 0.0, 1.0);
+ glCallList(object);
+//! [7]
+
+//! [8]
+ glMatrixMode(GL_MODELVIEW);
+ glPopMatrix();
+//! [8]
+
+//! [10]
+ QPainter painter(this);
+ painter.setRenderHint(QPainter::Antialiasing);
+ foreach (Bubble *bubble, bubbles) {
+ if (bubble->rect().intersects(event->rect()))
+ bubble->drawBubble(&painter);
+ }
+ drawInstructions(&painter);
+ painter.end();
+}
+//! [10]
+
+//! [11]
+void GLWidget::resizeGL(int width, int height)
+{
+ setupViewport(width, height);
+}
+//! [11]
+
+//! [12]
+void GLWidget::showEvent(QShowEvent *event)
+{
+ Q_UNUSED(event);
+ createBubbles(20 - bubbles.count());
+}
+//! [12]
+
+QSize GLWidget::sizeHint() const
+{
+ return QSize(400, 400);
+}
+
+GLuint GLWidget::makeObject()
+{
+ GLuint list = glGenLists(1);
+ glNewList(list, GL_COMPILE);
+
+ glEnable(GL_NORMALIZE);
+ glBegin(GL_QUADS);
+
+ static GLfloat logoDiffuseColor[4] = {trolltechGreen.red()/255.0,
+ trolltechGreen.green()/255.0,
+ trolltechGreen.blue()/255.0, 1.0};
+ glMaterialfv(GL_FRONT, GL_DIFFUSE, logoDiffuseColor);
+
+ GLdouble x1 = +0.06;
+ GLdouble y1 = -0.14;
+ GLdouble x2 = +0.14;
+ GLdouble y2 = -0.06;
+ GLdouble x3 = +0.08;
+ GLdouble y3 = +0.00;
+ GLdouble x4 = +0.30;
+ GLdouble y4 = +0.22;
+
+ quad(x1, y1, x2, y2, y2, x2, y1, x1);
+ quad(x3, y3, x4, y4, y4, x4, y3, x3);
+
+ extrude(x1, y1, x2, y2);
+ extrude(x2, y2, y2, x2);
+ extrude(y2, x2, y1, x1);
+ extrude(y1, x1, x1, y1);
+ extrude(x3, y3, x4, y4);
+ extrude(x4, y4, y4, x4);
+ extrude(y4, x4, y3, x3);
+
+ const double Pi = 3.14159265358979323846;
+ const int NumSectors = 200;
+
+ for (int i = 0; i < NumSectors; ++i) {
+ double angle1 = (i * 2 * Pi) / NumSectors;
+ GLdouble x5 = 0.30 * sin(angle1);
+ GLdouble y5 = 0.30 * cos(angle1);
+ GLdouble x6 = 0.20 * sin(angle1);
+ GLdouble y6 = 0.20 * cos(angle1);
+
+ double angle2 = ((i + 1) * 2 * Pi) / NumSectors;
+ GLdouble x7 = 0.20 * sin(angle2);
+ GLdouble y7 = 0.20 * cos(angle2);
+ GLdouble x8 = 0.30 * sin(angle2);
+ GLdouble y8 = 0.30 * cos(angle2);
+
+ quad(x5, y5, x6, y6, x7, y7, x8, y8);
+
+ extrude(x6, y6, x7, y7);
+ extrude(x8, y8, x5, y5);
+ }
+
+ glEnd();
+
+ glEndList();
+ return list;
+}
+
+void GLWidget::quad(GLdouble x1, GLdouble y1, GLdouble x2, GLdouble y2,
+ GLdouble x3, GLdouble y3, GLdouble x4, GLdouble y4)
+{
+ glNormal3d(0.0, 0.0, -1.0);
+ glVertex3d(x1, y1, -0.05);
+ glVertex3d(x2, y2, -0.05);
+ glVertex3d(x3, y3, -0.05);
+ glVertex3d(x4, y4, -0.05);
+
+ glNormal3d(0.0, 0.0, 1.0);
+ glVertex3d(x4, y4, +0.05);
+ glVertex3d(x3, y3, +0.05);
+ glVertex3d(x2, y2, +0.05);
+ glVertex3d(x1, y1, +0.05);
+}
+
+void GLWidget::extrude(GLdouble x1, GLdouble y1, GLdouble x2, GLdouble y2)
+{
+ qglColor(trolltechGreen.dark(250 + int(100 * x1)));
+
+ glNormal3d((x1 + x2)/2.0, (y1 + y2)/2.0, 0.0);
+ glVertex3d(x1, y1, +0.05);
+ glVertex3d(x2, y2, +0.05);
+ glVertex3d(x2, y2, -0.05);
+ glVertex3d(x1, y1, -0.05);
+}
+
+void GLWidget::normalizeAngle(int *angle)
+{
+ while (*angle < 0)
+ *angle += 360 * 16;
+ while (*angle > 360 * 16)
+ *angle -= 360 * 16;
+}
+
+void GLWidget::createBubbles(int number)
+{
+ for (int i = 0; i < number; ++i) {
+ QPointF position(width()*(0.1 + (0.8*qrand()/(RAND_MAX+1.0))),
+ height()*(0.1 + (0.8*qrand()/(RAND_MAX+1.0))));
+ qreal radius = qMin(width(), height())*(0.0125 + 0.0875*qrand()/(RAND_MAX+1.0));
+ QPointF velocity(width()*0.0125*(-0.5 + qrand()/(RAND_MAX+1.0)),
+ height()*0.0125*(-0.5 + qrand()/(RAND_MAX+1.0)));
+
+ bubbles.append(new Bubble(position, radius, velocity));
+ }
+}
+
+//! [13]
+void GLWidget::animate()
+{
+ QMutableListIterator<Bubble*> iter(bubbles);
+
+ while (iter.hasNext()) {
+ Bubble *bubble = iter.next();
+ bubble->move(rect());
+ }
+ update();
+}
+//! [13]
+
+//! [14]
+void GLWidget::setupViewport(int width, int height)
+{
+ int side = qMin(width, height);
+ glViewport((width - side) / 2, (height - side) / 2, side, side);
+
+ glMatrixMode(GL_PROJECTION);
+ glLoadIdentity();
+ glOrtho(-0.5, +0.5, +0.5, -0.5, 4.0, 15.0);
+ glMatrixMode(GL_MODELVIEW);
+}
+//! [14]
+
+//! [15]
+void GLWidget::drawInstructions(QPainter *painter)
+{
+ QString text = tr("Click and drag with the left mouse button "
+ "to rotate the Qt logo.");
+ QFontMetrics metrics = QFontMetrics(font());
+ int border = qMax(4, metrics.leading());
+
+ QRect rect = metrics.boundingRect(0, 0, width() - 2*border, int(height()*0.125),
+ Qt::AlignCenter | Qt::TextWordWrap, text);
+ painter->setRenderHint(QPainter::TextAntialiasing);
+ painter->fillRect(QRect(0, 0, width(), rect.height() + 2*border),
+ QColor(0, 0, 0, 127));
+ painter->setPen(Qt::white);
+ painter->fillRect(QRect(0, 0, width(), rect.height() + 2*border),
+ QColor(0, 0, 0, 127));
+ painter->drawText((width() - rect.width())/2, border,
+ rect.width(), rect.height(),
+ Qt::AlignCenter | Qt::TextWordWrap, text);
+}
+//! [15]
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