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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);

}