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window.cpp Example File
opengl/hellogl/window.cpp

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 #include <QtGui>

 #include "glwidget.h"
 #include "window.h"

 Window::Window()
 {
     glWidget = new GLWidget;

     xSlider = createSlider();
     ySlider = createSlider();
     zSlider = createSlider();

     connect(xSlider, SIGNAL(valueChanged(int)), glWidget, SLOT(setXRotation(int)));
     connect(glWidget, SIGNAL(xRotationChanged(int)), xSlider, SLOT(setValue(int)));
     connect(ySlider, SIGNAL(valueChanged(int)), glWidget, SLOT(setYRotation(int)));
     connect(glWidget, SIGNAL(yRotationChanged(int)), ySlider, SLOT(setValue(int)));
     connect(zSlider, SIGNAL(valueChanged(int)), glWidget, SLOT(setZRotation(int)));
     connect(glWidget, SIGNAL(zRotationChanged(int)), zSlider, SLOT(setValue(int)));

     QHBoxLayout *mainLayout = new QHBoxLayout;
     mainLayout->addWidget(glWidget);
     mainLayout->addWidget(xSlider);
     mainLayout->addWidget(ySlider);
     mainLayout->addWidget(zSlider);
     setLayout(mainLayout);

     xSlider->setValue(15 * 16);
     ySlider->setValue(345 * 16);
     zSlider->setValue(0 * 16);
     setWindowTitle(tr("Hello GL"));
 }

 QSlider *Window::createSlider()
 {
     QSlider *slider = new QSlider(Qt::Vertical);
     slider->setRange(0, 360 * 16);
     slider->setSingleStep(16);
     slider->setPageStep(15 * 16);
     slider->setTickInterval(15 * 16);
     slider->setTickPosition(QSlider::TicksRight);
     return slider;
 }