window.cpp Example File
animation/easing/window.cpp

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 #include "window.h"

 Window::Window(QWidget *parent)
     : QWidget(parent), m_iconSize(64, 64)
 {
     m_ui.setupUi(this);
     QButtonGroup *buttonGroup = qFindChild<QButtonGroup *>(this);     // ### workaround for uic in 4.4
     m_ui.easingCurvePicker->setIconSize(m_iconSize);
     m_ui.easingCurvePicker->setMinimumHeight(m_iconSize.height() + 50);
     buttonGroup->setId(m_ui.lineRadio, 0);
     buttonGroup->setId(m_ui.circleRadio, 1);

     QEasingCurve dummy;
     m_ui.periodSpinBox->setValue(dummy.period());
     m_ui.amplitudeSpinBox->setValue(dummy.amplitude());
     m_ui.overshootSpinBox->setValue(dummy.overshoot());

     connect(m_ui.easingCurvePicker, SIGNAL(currentRowChanged(int)), this, SLOT(curveChanged(int)));
     connect(buttonGroup, SIGNAL(buttonClicked(int)), this, SLOT(pathChanged(int)));
     connect(m_ui.periodSpinBox, SIGNAL(valueChanged(double)), this, SLOT(periodChanged(double)));
     connect(m_ui.amplitudeSpinBox, SIGNAL(valueChanged(double)), this, SLOT(amplitudeChanged(double)));
     connect(m_ui.overshootSpinBox, SIGNAL(valueChanged(double)), this, SLOT(overshootChanged(double)));
     createCurveIcons();

     QPixmap pix(QLatin1String(":/images/qt-logo.png"));
     m_item = new PixmapItem(pix);
     m_scene.addItem(m_item);
     m_ui.graphicsView->setScene(&m_scene);

     m_anim = new Animation(m_item, "pos");
     m_anim->setEasingCurve(QEasingCurve::OutBounce);
     m_ui.easingCurvePicker->setCurrentRow(int(QEasingCurve::OutBounce));

     startAnimation();
 }

 void Window::createCurveIcons()
 {
     QPixmap pix(m_iconSize);
     QPainter painter(&pix);
     QLinearGradient gradient(0,0, 0, m_iconSize.height());
     gradient.setColorAt(0.0, QColor(240, 240, 240));
     gradient.setColorAt(1.0, QColor(224, 224, 224));
     QBrush brush(gradient);
     const QMetaObject &mo = QEasingCurve::staticMetaObject;
     QMetaEnum metaEnum = mo.enumerator(mo.indexOfEnumerator("Type"));
     // Skip QEasingCurve::Custom
     for (int i = 0; i < QEasingCurve::NCurveTypes - 1; ++i) {
         painter.fillRect(QRect(QPoint(0, 0), m_iconSize), brush);
         QEasingCurve curve((QEasingCurve::Type)i);
         painter.setPen(QColor(0, 0, 255, 64));
         qreal xAxis = m_iconSize.height()/1.5;
         qreal yAxis = m_iconSize.width()/3;
         painter.drawLine(0, xAxis, m_iconSize.width(),  xAxis);
         painter.drawLine(yAxis, 0, yAxis, m_iconSize.height());

         qreal curveScale = m_iconSize.height()/2;

         painter.setPen(Qt::NoPen);

         // start point
         painter.setBrush(Qt::red);
         QPoint start(yAxis, xAxis - curveScale * curve.valueForProgress(0));
         painter.drawRect(start.x() - 1, start.y() - 1, 3, 3);

         // end point
         painter.setBrush(Qt::blue);
         QPoint end(yAxis + curveScale, xAxis - curveScale * curve.valueForProgress(1));
         painter.drawRect(end.x() - 1, end.y() - 1, 3, 3);

         QPainterPath curvePath;
         curvePath.moveTo(start);
         for (qreal t = 0; t <= 1.0; t+=1.0/curveScale) {
             QPoint to;
             to.setX(yAxis + curveScale * t);
             to.setY(xAxis - curveScale * curve.valueForProgress(t));
             curvePath.lineTo(to);
         }
         painter.setRenderHint(QPainter::Antialiasing, true);
         painter.strokePath(curvePath, QColor(32, 32, 32));
         painter.setRenderHint(QPainter::Antialiasing, false);
         QListWidgetItem *item = new QListWidgetItem;
         item->setIcon(QIcon(pix));
         item->setText(metaEnum.key(i));
         m_ui.easingCurvePicker->addItem(item);
     }
 }

 void Window::startAnimation()
 {
     m_anim->setStartValue(QPointF(0, 0));
     m_anim->setEndValue(QPointF(100, 100));
     m_anim->setDuration(2000);
     m_anim->setLoopCount(-1); // forever
     m_anim->start();
 }

 void Window::curveChanged(int row)
 {
     QEasingCurve::Type curveType = (QEasingCurve::Type)row;
     m_anim->setEasingCurve(curveType);
     m_anim->setCurrentTime(0);

     bool isElastic = curveType >= QEasingCurve::InElastic && curveType <= QEasingCurve::OutInElastic;
     bool isBounce = curveType >= QEasingCurve::InBounce && curveType <= QEasingCurve::OutInBounce;
     m_ui.periodSpinBox->setEnabled(isElastic);
     m_ui.amplitudeSpinBox->setEnabled(isElastic || isBounce);
     m_ui.overshootSpinBox->setEnabled(curveType >= QEasingCurve::InBack && curveType <= QEasingCurve::OutInBack);
 }

 void Window::pathChanged(int index)
 {
     m_anim->setPathType((Animation::PathType)index);
 }

 void Window::periodChanged(double value)
 {
     QEasingCurve curve = m_anim->easingCurve();
     curve.setPeriod(value);
     m_anim->setEasingCurve(curve);
 }

 void Window::amplitudeChanged(double value)
 {
     QEasingCurve curve = m_anim->easingCurve();
     curve.setAmplitude(value);
     m_anim->setEasingCurve(curve);
 }

 void Window::overshootChanged(double value)
 {
     QEasingCurve curve = m_anim->easingCurve();
     curve.setOvershoot(value);
     m_anim->setEasingCurve(curve);
 }