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| ** This file is part of the examples of the Qt Toolkit. |
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| |
| #include <QtWidgets> |
| #include <QtOpenGL> |
| |
| #include <math.h> |
| |
| #include "glwidget.h" |
| #include "qtlogo.h" |
| |
| #ifndef GL_MULTISAMPLE |
| #define GL_MULTISAMPLE 0x809D |
| #endif |
| |
| //! [0] |
| GLWidget::GLWidget(QWidget *parent) |
| : QGLWidget(QGLFormat(QGL::SampleBuffers), parent) |
| { |
| 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); |
| } |
| //! [0] |
| |
| //! [1] |
| GLWidget::~GLWidget() |
| { |
| } |
| //! [1] |
| |
| //! [2] |
| QSize GLWidget::minimumSizeHint() const |
| { |
| return QSize(50, 50); |
| } |
| //! [2] |
| |
| //! [3] |
| QSize GLWidget::sizeHint() const |
| //! [3] //! [4] |
| { |
| return QSize(400, 400); |
| } |
| //! [4] |
| |
| static void qNormalizeAngle(int &angle) |
| { |
| while (angle < 0) |
| angle += 360 * 16; |
| while (angle > 360 * 16) |
| angle -= 360 * 16; |
| } |
| |
| //! [5] |
| void GLWidget::setXRotation(int angle) |
| { |
| qNormalizeAngle(angle); |
| if (angle != xRot) { |
| xRot = angle; |
| emit xRotationChanged(angle); |
| update(); |
| } |
| } |
| //! [5] |
| |
| void GLWidget::setYRotation(int angle) |
| { |
| qNormalizeAngle(angle); |
| if (angle != yRot) { |
| yRot = angle; |
| emit yRotationChanged(angle); |
| update(); |
| } |
| } |
| |
| void GLWidget::setZRotation(int angle) |
| { |
| qNormalizeAngle(angle); |
| if (angle != zRot) { |
| zRot = angle; |
| emit zRotationChanged(angle); |
| update(); |
| } |
| } |
| |
| //! [6] |
| void GLWidget::initializeGL() |
| { |
| initializeOpenGLFunctions(); |
| |
| qglClearColor(qtPurple.darker()); |
| |
| logo = new QtLogo(this, 64); |
| logo->setColor(qtGreen.darker()); |
| |
| glEnable(GL_DEPTH_TEST); |
| glEnable(GL_CULL_FACE); |
| glShadeModel(GL_SMOOTH); |
| 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); |
| } |
| //! [6] |
| |
| //! [7] |
| void GLWidget::paintGL() |
| { |
| 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] |
| void GLWidget::resizeGL(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); |
| } |
| //! [8] |
| |
| //! [9] |
| void GLWidget::mousePressEvent(QMouseEvent *event) |
| { |
| lastPos = event->pos(); |
| } |
| //! [9] |
| |
| //! [10] |
| 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(); |
| } |
| //! [10] |