/**************************************************************************** ** ** Copyright (C) 2016 The Qt Company Ltd. ** Contact: https://www.qt.io/licensing/ ** ** This file is part of the examples of the Qt Toolkit. ** ** $QT_BEGIN_LICENSE:BSD$ ** Commercial License Usage ** Licensees holding valid commercial Qt licenses may use this file in ** accordance with the commercial license agreement provided with the ** Software or, alternatively, in accordance with the terms contained in ** a written agreement between you and The Qt Company. For licensing terms ** and conditions see https://www.qt.io/terms-conditions. For further ** information use the contact form at https://www.qt.io/contact-us. ** ** BSD License Usage ** Alternatively, 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 The Qt Company Ltd 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 "bubble.h" #include "qtlogo.h" #include "glwidget.h" #include #include #include #include #include #ifndef GL_MULTISAMPLE #define GL_MULTISAMPLE 0x809D #endif //! [0] GLWidget::GLWidget(QWidget *parent) : QGLWidget(QGLFormat(QGL::SampleBuffers), parent) { QTime midnight(0, 0, 0); logo = 0; xRot = 0; yRot = 0; zRot = 0; qtGreen = QColor::fromCmykF(0.40, 0.0, 1.0, 0.0); qtPurple = 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() { } //! [1] static void qNormalizeAngle(int &angle) { while (angle < 0) angle += 360 * 16; while (angle > 360 * 16) angle -= 360 * 16; } void GLWidget::setXRotation(int angle) { qNormalizeAngle(angle); if (angle != xRot) xRot = angle; } void GLWidget::setYRotation(int angle) { qNormalizeAngle(angle); if (angle != yRot) yRot = angle; } void GLWidget::setZRotation(int angle) { qNormalizeAngle(angle); if (angle != zRot) zRot = angle; } //! [2] void GLWidget::initializeGL() { initializeOpenGLFunctions(); glEnable(GL_MULTISAMPLE); logo = new QtLogo(this); logo->setColor(qtGreen.dark()); } //! [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(qtPurple.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); qreal pixelRatio = devicePixelRatio(); setupViewport(width() * pixelRatio, height() * pixelRatio); //! [6] //! [7] glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); glLoadIdentity(); glTranslatef(0.0, 0.0, -10.0); glRotatef(xRot / 16.0, 1.0, 0.0, 0.0); glRotatef(yRot / 16.0, 0.0, 1.0, 0.0); glRotatef(zRot / 16.0, 0.0, 0.0, 1.0); logo->draw(static_cast(this)); //! [7] //! [8] glShadeModel(GL_FLAT); glDisable(GL_CULL_FACE); glDisable(GL_DEPTH_TEST); glDisable(GL_LIGHTING); glMatrixMode(GL_MODELVIEW); glPopMatrix(); //! [8] //! [10] QPainter painter(this); painter.setRenderHint(QPainter::Antialiasing); for (Bubble *bubble : qAsConst(bubbles)) { if (bubble->rect().intersects(event->rect())) bubble->drawBubble(&painter); } drawInstructions(&painter); painter.end(); } //! [10] //! [11] void GLWidget::resizeGL(int width, int height) { qreal pixelRatio = devicePixelRatio(); setupViewport(width*pixelRatio, height*pixelRatio); } //! [11] //! [12] void GLWidget::showEvent(QShowEvent *event) { Q_UNUSED(event); createBubbles(20 - bubbles.count()); } //! [12] QSize GLWidget::sizeHint() const { return QSize(400, 400); } void GLWidget::createBubbles(int number) { for (int i = 0; i < number; ++i) { QPointF position(width()*(0.1 + QRandomGenerator::global()->bounded(0.8)), height()*(0.1 + QRandomGenerator::global()->bounded(0.8))); qreal radius = qMin(width(), height())*(0.0125 + QRandomGenerator::global()->bounded(0.0875)); QPointF velocity(width()*0.0125*(-0.5 + QRandomGenerator::global()->bounded(1.0)), height()*0.0125*(-0.5 + QRandomGenerator::global()->bounded(1.0))); bubbles.append(new Bubble(position, radius, velocity)); } } //! [13] void GLWidget::animate() { for (Bubble *bubble : qAsConst(bubbles)) 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(); #ifdef QT_OPENGL_ES glOrthof(-0.5, +0.5, -0.5, 0.5, 4.0, 15.0); #else glOrtho(-0.5, +0.5, -0.5, 0.5, 4.0, 15.0); #endif 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]