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# window.cpp Example File
opengl/textures/window.cpp

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     #include <QtGui>

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

     Window::Window()
     {
         QGridLayout *mainLayout = new QGridLayout;

         for (int i = 0; i < NumRows; ++i) {
             for (int j = 0; j < NumColumns; ++j) {
                 QColor clearColor;
                 clearColor.setHsv(((i * NumColumns) + j) * 255
                                   / (NumRows * NumColumns - 1),
                                   255, 63);

                 glWidgets[i][j] = new GLWidget(0, 0);
                 glWidgets[i][j]->setClearColor(clearColor);
                 glWidgets[i][j]->rotateBy(+42 * 16, +42 * 16, -21 * 16);
                 mainLayout->addWidget(glWidgets[i][j], i, j);

                 connect(glWidgets[i][j], SIGNAL(clicked()),
                         this, SLOT(setCurrentGlWidget()));
             }
         }
         setLayout(mainLayout);

         currentGlWidget = glWidgets[0][0];

         QTimer *timer = new QTimer(this);
         connect(timer, SIGNAL(timeout()), this, SLOT(rotateOneStep()));
         timer->start(20);

         setWindowTitle(tr("Textures"));
     }

     void Window::setCurrentGlWidget()
     {
         currentGlWidget = qobject_cast<GLWidget *>(sender());
     }

     void Window::rotateOneStep()
     {
         if (currentGlWidget)
             currentGlWidget->rotateBy(+2 * 16, +2 * 16, -1 * 16);
     }