qtgradientwidget.cpp

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#include "qtgradientwidget.h"
#include <QMap>
#include <QImage>
#include <QPainter>
#include <QScrollBar>
#include <QMouseEvent>

#define _USE_MATH_DEFINES


#include "math.h"
#include "qdebug.h"

#ifndef M_PI
#define M_PI 3.14159265358979323846
#endif

using namespace qdesigner_internal;

namespace qdesigner_internal {

class QtGradientWidgetPrivate
{
    QtGradientWidget *q_ptr;
    Q_DECLARE_PUBLIC(QtGradientWidget)
public:
    QPointF fromViewport(const QPointF &point) const;
    QPointF toViewport(const QPointF &point) const;
//    void setupDrag(QtGradientStop *stop, int x);

    QPointF checkRange(const QPointF &point) const;
    QRectF pointRect(const QPointF &point, double size) const;

    double correctAngle(double angle) const;
    void setAngleConical(double angle);

    double m_handleSize;
    bool m_backgroundTransparent;

    QGradientStops m_gradientStops;
    QGradient::Type m_gradientType;
    QGradient::Spread m_gradientSpread;
    QPointF m_startLinear;
    QPointF m_endLinear;
    QPointF m_centralRadial;
    QPointF m_focalRadial;
    qreal m_radiusRadial;
    QPointF m_centralConical;
    qreal m_angleConical;

    enum Handle {
        NoHandle,
        StartLinearHandle,
        EndLinearHandle,
        CentralRadialHandle,
        FocalRadialHandle,
        RadiusRadialHandle,
        CentralConicalHandle,
        AngleConicalHandle
    };

    Handle m_dragHandle;
    QPointF m_dragOffset;
    //double m_radiusOffset;
    double m_radiusFactor;
    double m_dragRadius;
    double m_angleOffset;
    double m_dragAngle;
};

}

double QtGradientWidgetPrivate::correctAngle(double angle) const
{
    double a = angle;
    while (a >= 360)
        a -= 360;
    while (a < 0)
        a += 360;
    return a;
}

void QtGradientWidgetPrivate::setAngleConical(double angle)
{
    double a = correctAngle(angle);
    if (m_angleConical == a)
        return;
    m_angleConical = a;
    emit q_ptr->angleConicalChanged(m_angleConical);
}

QRectF QtGradientWidgetPrivate::pointRect(const QPointF &point, double size) const
{
    return QRectF(point.x() - size / 2, point.y() - size / 2, size, size);
}

QPointF QtGradientWidgetPrivate::checkRange(const QPointF &point) const
{
    QPointF p = point;
    if (p.x() > 1)
        p.setX(1);
    else if (p.x() < 0)
        p.setX(0);
    if (p.y() > 1)
        p.setY(1);
    else if (p.y() < 0)
        p.setY(0);
    return p;
}

QPointF QtGradientWidgetPrivate::fromViewport(const QPointF &point) const
{
    QSize size = q_ptr->size();
    return QPointF(point.x() / size.width(), point.y() / size.height());
}

QPointF QtGradientWidgetPrivate::toViewport(const QPointF &point) const
{
    QSize size = q_ptr->size();
    return QPointF(point.x() * size.width(), point.y() * size.height());
}
/*
void QtGradientWidgetPrivate::setupDrag(QtGradientStop *stop, int x)
{
    m_model->setCurrentStop(stop);

    int viewportX = qRound(toViewport(stop->position()));
    m_dragOffset = x - viewportX;

    QList<QtGradientStop *> stops = m_stops;
    m_stops.clear();
    QListIterator<QtGradientStop *> itStop(stops);
    while (itStop.hasNext()) {
        QtGradientStop *s = itStop.next();
        if (m_model->isSelected(s) || s == stop) {
            m_dragStops[s] = s->position() - stop->position();
            m_stops.append(s);
        } else {
            m_dragOriginal[s->position()] = s->color();
        }
    }
    itStop.toFront();
    while (itStop.hasNext()) {
        QtGradientStop *s = itStop.next();
        if (!m_model->isSelected(s))
            m_stops.append(s);
    }
    m_stops.removeAll(stop);
    m_stops.prepend(stop);
}
*/
////////////////////////////

QtGradientWidget::QtGradientWidget(QWidget *parent)
    : QWidget(parent)
{
    d_ptr = new QtGradientWidgetPrivate;
    d_ptr->q_ptr = this;
    d_ptr->m_backgroundTransparent = true;
    d_ptr->m_handleSize = 30.0;
    d_ptr->m_gradientType = QGradient::LinearGradient;
    d_ptr->m_startLinear = QPointF(0, 0);
    d_ptr->m_endLinear = QPointF(1, 1);
    d_ptr->m_centralRadial = QPointF(0.5, 0.5);
    d_ptr->m_focalRadial = QPointF(0.5, 0.5);
    d_ptr->m_radiusRadial = 0.5;
    d_ptr->m_centralConical = QPointF(0.5, 0.5);
    d_ptr->m_angleConical = 0;
    d_ptr->m_dragHandle = QtGradientWidgetPrivate::NoHandle;

    setSizePolicy(QSizePolicy(QSizePolicy::Preferred, QSizePolicy::Preferred));
}

QtGradientWidget::~QtGradientWidget()
{
    delete d_ptr;
}

QSize QtGradientWidget::sizeHint() const
{
    return QSize(176, 176);
}

QSize QtGradientWidget::minimumSizeHint() const
{
    return QSize(128, 128);
}

int QtGradientWidget::heightForWidth(int w) const
{
    return w;
}

void QtGradientWidget::setBackgroundTransparent(bool transparent)
{
    if (d_ptr->m_backgroundTransparent == transparent)
        return;
    d_ptr->m_backgroundTransparent = transparent;
    update();
}

bool QtGradientWidget::backgroundTransparent() const
{
    return d_ptr->m_backgroundTransparent;
}

void QtGradientWidget::mousePressEvent(QMouseEvent *e)
{
    if (e->button() != Qt::LeftButton)
        return;

    QPoint p = e->pos();
    if (d_ptr->m_gradientType == QGradient::LinearGradient) {
        QPointF startPoint = d_ptr->toViewport(d_ptr->m_startLinear);
        double x = p.x() - startPoint.x();
        double y = p.y() - startPoint.y();

        if ((d_ptr->m_handleSize * d_ptr->m_handleSize / 4) > (x * x + y * y)) {
            d_ptr->m_dragHandle = QtGradientWidgetPrivate::StartLinearHandle;
            d_ptr->m_dragOffset = QPointF(x, y);
            update();
            return;
        }

        QPointF endPoint = d_ptr->toViewport(d_ptr->m_endLinear);
        x = p.x() - endPoint.x();
        y = p.y() - endPoint.y();

        if ((d_ptr->m_handleSize * d_ptr->m_handleSize / 4) > (x * x + y * y)) {
            d_ptr->m_dragHandle = QtGradientWidgetPrivate::EndLinearHandle;
            d_ptr->m_dragOffset = QPointF(x, y);
            update();
            return;
        }
    } else if (d_ptr->m_gradientType == QGradient::RadialGradient) {
        QPointF focalPoint = d_ptr->toViewport(d_ptr->m_focalRadial);
        double x = p.x() - focalPoint.x();
        double y = p.y() - focalPoint.y();

        if ((d_ptr->m_handleSize * d_ptr->m_handleSize / 9) > (x * x + y * y)) {
            d_ptr->m_dragHandle = QtGradientWidgetPrivate::FocalRadialHandle;
            d_ptr->m_dragOffset = QPointF(x, y);
            update();
            return;
        }

        QPointF centralPoint = d_ptr->toViewport(d_ptr->m_centralRadial);
        x = p.x() - centralPoint.x();
        y = p.y() - centralPoint.y();

        if ((d_ptr->m_handleSize * d_ptr->m_handleSize / 4) > (x * x + y * y)) {
            d_ptr->m_dragHandle = QtGradientWidgetPrivate::CentralRadialHandle;
            d_ptr->m_dragOffset = QPointF(x, y);
            update();
            return;
        }

        QPointF central = d_ptr->toViewport(d_ptr->m_centralRadial);
        QRectF r = d_ptr->pointRect(central, 2 * d_ptr->m_handleSize / 3);
        QRectF r1(0, r.y(), size().width(), r.height());
        QRectF r2(r.x(), 0, r.width(), r.y());
        QRectF r3(r.x(), r.y() + r.height(), r.width(), size().height() - r.y() - r.height());
        QPointF pF(p.x(), p.y());
        if (r1.contains(pF) || r2.contains(pF) || r3.contains(pF)) {
            x = pF.x() / size().width() - d_ptr->m_centralRadial.x();
            y = pF.y() / size().height() - d_ptr->m_centralRadial.y();
            double clickRadius = sqrt(x * x + y * y);
            //d_ptr->m_radiusOffset = d_ptr->m_radiusRadial - clickRadius;
            d_ptr->m_radiusFactor = d_ptr->m_radiusRadial / clickRadius;
            if (d_ptr->m_radiusFactor == 0)
                d_ptr->m_radiusFactor = 1;
            d_ptr->m_dragRadius = d_ptr->m_radiusRadial;
            d_ptr->m_dragHandle = QtGradientWidgetPrivate::RadiusRadialHandle;
            mouseMoveEvent(e);
            update();
            return;
        }
    } else if (d_ptr->m_gradientType == QGradient::ConicalGradient) {
        QPointF centralPoint = d_ptr->toViewport(d_ptr->m_centralConical);
        double x = p.x() - centralPoint.x();
        double y = p.y() - centralPoint.y();

        if ((d_ptr->m_handleSize * d_ptr->m_handleSize / 4) > (x * x + y * y)) {
            d_ptr->m_dragHandle = QtGradientWidgetPrivate::CentralConicalHandle;
            d_ptr->m_dragOffset = QPointF(x, y);
            update();
            return;
        }
        double radius = size().width();
        if (size().height() < radius)
            radius = size().height();
        radius /= 2;
        double corr = d_ptr->m_handleSize / 3;
        radius -= corr;
        QPointF vp = d_ptr->toViewport(d_ptr->m_centralConical);
        x = p.x() - vp.x();
        y = p.y() - vp.y();
        if (((radius - corr) * (radius - corr) < (x * x + y * y)) &&
            ((radius + corr) * (radius + corr) > (x * x + y * y))) {
            QPointF central = d_ptr->toViewport(d_ptr->m_centralConical);
            QPointF current(e->pos().x(), e->pos().y());
            x = current.x() - central.x();
            y = current.y() - central.y();
            x /= size().width() / 2;
            y /= size().height() / 2;
            double r = sqrt(x * x + y * y);

            double arcSin = asin(y / r);
            double arcCos = acos(x / r);

            double angle = arcCos * 180 / M_PI;
            if (arcSin > 0) {
                angle = -angle;
            }

            d_ptr->m_angleOffset = d_ptr->m_angleConical - angle;
            d_ptr->m_dragAngle = d_ptr->m_angleConical;
            d_ptr->m_dragHandle = QtGradientWidgetPrivate::AngleConicalHandle;
            update();
            return;
        }
    }
}

void QtGradientWidget::mouseReleaseEvent(QMouseEvent *e)
{
    Q_UNUSED(e)
    d_ptr->m_dragHandle = QtGradientWidgetPrivate::NoHandle;
    update();
}

void QtGradientWidget::mouseMoveEvent(QMouseEvent *e)
{
    if (d_ptr->m_dragHandle == QtGradientWidgetPrivate::NoHandle)
        return;

    QPointF newPos = QPointF((double)e->pos().x() - d_ptr->m_dragOffset.x(),
                (double)e->pos().y() - d_ptr->m_dragOffset.y());
    QPointF newPoint = d_ptr->fromViewport(newPos);
    if (newPoint.x() < 0)
        newPoint.setX(0);
    else if (newPoint.x() > 1)
        newPoint.setX(1);
    if (newPoint.y() < 0)
        newPoint.setY(0);
    else if (newPoint.y() > 1)
        newPoint.setY(1);

    if (d_ptr->m_dragHandle == QtGradientWidgetPrivate::StartLinearHandle) {
        d_ptr->m_startLinear = newPoint;
        emit startLinearChanged(newPoint);
    } else if (d_ptr->m_dragHandle == QtGradientWidgetPrivate::EndLinearHandle) {
        d_ptr->m_endLinear = newPoint;
        emit endLinearChanged(newPoint);
    } else if (d_ptr->m_dragHandle == QtGradientWidgetPrivate::CentralRadialHandle) {
        d_ptr->m_centralRadial = newPoint;