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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); <span class="comment">// ### workaround for uic in 4.4</span>
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"));
<span class="comment">// Skip QEasingCurve::Custom</span>
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);
<span class="comment">// start point</span>
painter.setBrush(Qt::red);
QPoint start(yAxis, xAxis - curveScale * curve.valueForProgress(0));
painter.drawRect(start.x() - 1, start.y() - 1, 3, 3);
<span class="comment">// end point</span>
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); <span class="comment">// forever</span>
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);
}</pre>
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