| /**************************************************************************** |
| ** |
| ** 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 |
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| ** |
| ** 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: |
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| ****************************************************************************/ |
| |
| #include "bubble.h" |
| #include "qtlogo.h" |
| #include "glwidget.h" |
| |
| #include <QMouseEvent> |
| #include <QRandomGenerator> |
| #include <QTime> |
| |
| #include <math.h> |
| #include <stdlib.h> |
| |
| #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.darker()); |
| } |
| //! [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.darker()); |
| 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<QOpenGLFunctions_1_1 *>(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] |