コード例 #1
0
bool
CornerPinOverlayInteract::onOverlayPenUp(TimeValue time,
                                         const RenderScale & /*renderScale*/,
                                         ViewIdx view,
                                         const QPointF & /*viewportPos*/,
                                         const QPointF & /*pos*/,
                                         double /*pressure*/,
                                         TimeValue /*timestamp*/)
{
    // do not show interact if knob is secret or not enabled
    // see https://github.com/MrKepzie/Natron/issues/932
    KnobDoublePtr from1Knob = _imp->from[0].lock();

    if ( !from1Knob || !from1Knob->shouldDrawOverlayInteract() ) {
        return false;
    }

    bool didSomething = _imp->dragging != -1;

    if ( !_imp->interactiveDrag && (_imp->dragging != -1) ) {
        // no need to redraw overlay since it is slave to the paramaters
        if (_imp->useFromDrag) {
            KnobDoublePtr knob = _imp->from[_imp->dragging].lock();
            assert(knob);
            std::vector<double> val(2);
            val[0] = _imp->fromDrag[_imp->dragging].x;
            val[1] = _imp->fromDrag[_imp->dragging].y;
            knob->setValueAcrossDimensions(val, DimIdx(0), view, eValueChangedReasonUserEdited);
        } else {
            KnobDoublePtr knob = _imp->to[_imp->dragging].lock();
            assert(knob);
            std::vector<double> val(2);
            val[0] = _imp->toDrag[_imp->dragging].x;
            val[1] = _imp->toDrag[_imp->dragging].y;

            if (_imp->toPointsAutoKeyingEnabled) {
                knob->setValueAtTimeAcrossDimensions(time, val, DimIdx(0), view, eValueChangedReasonUserEdited);

                // Also set a keyframe on other points
                for (int i = 0; i < 4; ++i) {
                    if (i == _imp->dragging) {
                        continue;
                    }
                    std::vector<double> values(2);
                    KnobDoublePtr toPoint = _imp->to[i].lock();
                    values[0] = toPoint->getValueAtTime(time, DimIdx(0));
                    values[1] = toPoint->getValueAtTime(time, DimIdx(1));
                    toPoint->setValueAtTimeAcrossDimensions(time, values, DimIdx(0), view, eValueChangedReasonUserEdited);
                }
            } else {
                knob->setValueAcrossDimensions(val, DimIdx(0), view, eValueChangedReasonUserEdited);
            }
        }
    }
    _imp->dragging = -1;

    return didSomething;
} // onOverlayPenUp
コード例 #2
0
ファイル: ViewerNode.cpp プロジェクト: ebrayton/Natron
void
ViewerNode::setUserRoI(const RectD& rect)
{
    KnobDoublePtr btmLeft = _imp->userRoIBtmLeftKnob.lock();
    KnobDoublePtr size = _imp->userRoISizeKnob.lock();
    std::vector<double> values(2);
    values[0] = rect.x1;
    values[1] = rect.y1;
    btmLeft->setValueAcrossDimensions(values, DimIdx(0), ViewSetSpec::all(), eValueChangedReasonUserEdited);
    values[0] = rect.x2 - rect.x1;
    values[1] = rect.y2 - rect.y1;
    size->setValueAcrossDimensions(values, DimIdx(0), ViewSetSpec::all(), eValueChangedReasonUserEdited);
}
コード例 #3
0
ファイル: TrackMarker.cpp プロジェクト: kcotugno/Natron
void
TrackMarker::resetTrack()
{
    Point curCenter;
    KnobDoublePtr centerKnob = getCenterKnob();

    curCenter.x = centerKnob->getValue();
    curCenter.y = centerKnob->getValue(DimIdx(1));

    const KnobsVec& knobs = getKnobs();
    for (KnobsVec::const_iterator it = knobs.begin(); it != knobs.end(); ++it) {
        if (*it != centerKnob) {
            (*it)->resetToDefaultValue(DimSpec::all(), ViewSetSpec::all());
        } else {
            (*it)->removeAnimation(ViewSetSpec::all(), DimSpec::all(), eValueChangedReasonUserEdited);

            std::vector<double> values(2);
            values[0] = curCenter.x;
            values[1] = curCenter.y;
            centerKnob->setValueAcrossDimensions(values);
        }
    }

    removeAnimation(ViewSetSpec::all(), DimSpec::all(), eValueChangedReasonUserEdited);
}
コード例 #4
0
bool
PointOverlayInteract::onOverlayPenUp(TimeValue time,
                                     const RenderScale & renderScale,
                                     ViewIdx view,
                                     const QPointF & viewportPos,
                                     const QPointF & penPos,
                                     double pressure,
                                     TimeValue timestamp)
{
    KnobDoublePtr knob = _imp->param.lock();

    // do not show interact if knob is secret or not enabled
    // see https://github.com/MrKepzie/Natron/issues/932
    if ( !knob || !knob->shouldDrawOverlayInteract() ) {
        return false;
    }

    RenderScale pscale;
    getPixelScale(pscale.x, pscale.y);
    
    bool didSomething = false;
    if (_imp->state == ePositionInteractStatePicked) {
        if (!_imp->interactiveDrag) {
            std::vector<double> p(2);
            p[0] = fround(_imp->lastPenPos.x(), pscale.x);
            p[1] = fround(_imp->lastPenPos.y(), pscale.y);
            for (int i = 0; i < 2; ++i) {
                if (knob->getValueIsNormalized(DimIdx(i)) != eValueIsNormalizedNone) {
                    p[i] = knob->normalize(DimIdx(i), time, p[i]);
                }
            }

            knob->setValueAcrossDimensions(p, DimIdx(0), view, eValueChangedReasonUserEdited);
        }

        _imp->state = ePositionInteractStateInactive;
        bool motion = onOverlayPenMotion(time, renderScale, view, viewportPos, penPos, pressure, timestamp);
        Q_UNUSED(motion);
        didSomething = true;
    }
    
    return didSomething;
} // onOverlayPenUp
コード例 #5
0
ファイル: TrackMarker.cpp プロジェクト: kcotugno/Natron
void
TrackMarker::setKeyFrameOnCenterAndPatternAtTime(TimeValue time)
{
    KnobDoublePtr center = _imp->center.lock();

    {
        std::vector<double> values(2);
        values[0] = center->getValueAtTime(time);
        values[1] = center->getValueAtTime(time, DimIdx(1));
        center->setValueAtTimeAcrossDimensions(time, values);
    }

    KnobDoublePtr patternCorners[4] = {_imp->patternBtmLeft.lock(), _imp->patternTopLeft.lock(), _imp->patternTopRight.lock(), _imp->patternBtmRight.lock()};
    for (int c = 0; c < 4; ++c) {
        KnobDoublePtr k = patternCorners[c];
        std::vector<double> values(2);
        values[0] = k->getValueAtTime(time, DimIdx(0));
        values[1] = k->getValueAtTime(time, DimIdx(1));
        k->setValueAcrossDimensions(values);
    }
}
コード例 #6
0
ファイル: TrackerHelper.cpp プロジェクト: kcotugno/Natron
void
TrackerHelper::trackMarkers(const std::list<TrackMarkerPtr >& markers,
                             TimeValue start,
                             TimeValue end,
                             TimeValue frameStep,
                            const ViewerNodePtr& viewer)
{
    if ( markers.empty() ) {
        Q_EMIT trackingFinished();
        return;
    }

    TrackerParamsProviderPtr provider = _imp->provider.lock();
    if (!provider) {
        Q_EMIT trackingFinished();
        return;
    }

    NodePtr trackerNode = provider->getTrackerNode();
    if (!trackerNode) {
        Q_EMIT trackingFinished();
        return;
    }

    if (trackerNode->hasMandatoryInputDisconnected()) {
        Q_EMIT trackingFinished();
        return;
    }



    // The channels we are going to use for tracking
    bool enabledChannels[3];
    provider->getTrackChannels(&enabledChannels[0], &enabledChannels[1], &enabledChannels[2]);


    double formatWidth, formatHeight;
    Format f;
    trackerNode->getApp()->getProject()->getProjectDefaultFormat(&f);
    formatWidth = f.width();
    formatHeight = f.height();

    bool autoKeyingOnEnabledParamEnabled = provider->canDisableMarkersAutomatically();

    /// The accessor and its cache is local to a track operation, it is wiped once the whole sequence track is finished.
    boost::shared_ptr<TrackerFrameAccessor> accessor( new TrackerFrameAccessor(trackerNode, enabledChannels, formatHeight) );
    boost::shared_ptr<mv::AutoTrack> trackContext( new mv::AutoTrack( accessor.get() ) );
    std::vector<TrackMarkerAndOptionsPtr > trackAndOptions;
    mv::TrackRegionOptions mvOptions;
    /*
     Get the global parameters for the LivMV track: pre-blur sigma, No iterations, normalized intensities, etc...
     */
    _imp->beginLibMVOptionsForTrack(&mvOptions);

    /*
     For the given markers, do the following:
     - Get the "User" keyframes that have been set and create a LibMV marker for each keyframe as well as for the "start" time
     - Set the "per-track" parameters that were given by the user, that is the mv::TrackRegionOptions
     - t->mvMarker will contain the marker that evolves throughout the tracking
     */
    int trackIndex = 0;
    for (std::list<TrackMarkerPtr >::const_iterator it = markers.begin(); it != markers.end(); ++it, ++trackIndex) {

        if (autoKeyingOnEnabledParamEnabled) {
            (*it)->setEnabledAtTime(start, true);
        }

        TrackMarkerAndOptionsPtr t(new TrackMarkerAndOptions);
        t->natronMarker = *it;

        int mode_i = (*it)->getMotionModelKnob()->getValue();
        mvOptions.mode = motionModelIndexToLivMVMode(mode_i);

        // Set a keyframe on the marker to initialize its position
        {
            KnobDoublePtr centerKnob = (*it)->getCenterKnob();
            std::vector<double> values(2);
            values[0] = centerKnob->getValueAtTime(start, DimIdx(0));
            values[1] = centerKnob->getValueAtTime(start, DimIdx(1));
            centerKnob->setValueAtTimeAcrossDimensions(start, values);
        }

        // For a translation warp, we do not need to add an animation curve for the pattern which stays constant.
        if (mvOptions.mode != libmv::TrackRegionOptions::TRANSLATION) {
            KnobDoublePtr patternCorners[4];
            patternCorners[0] = (*it)->getPatternBtmLeftKnob();
            patternCorners[1] = (*it)->getPatternBtmRightKnob();
            patternCorners[2] = (*it)->getPatternTopRightKnob();
            patternCorners[3] = (*it)->getPatternTopLeftKnob();
            for (int c = 0; c < 4; ++c) {
                KnobDoublePtr k = patternCorners[c];
                std::vector<double> values(2);
                values[0] = k->getValueAtTime(start, DimIdx(0));
                values[1] = k->getValueAtTime(start, DimIdx(1));
                k->setValueAcrossDimensions(values);
            }
        }

        std::set<double> userKeys;
        t->natronMarker->getMasterKeyFrameTimes(ViewIdx(0), &userKeys);

        if ( userKeys.empty() ) {
            // Set a user keyframe on tracking start if the marker does not have any user keys
            t->natronMarker->setKeyFrame(start, ViewSetSpec(0), 0);
        }

        PreviouslyTrackedFrameSet previousFramesOrdered;

        // Make sure to create a marker at the start time
        userKeys.insert(start);


        // Add a libmv marker for all keyframes
        for (std::set<double>::iterator it2 = userKeys.begin(); it2 != userKeys.end(); ++it2) {

            // Add the marker to the markers ordered only if it can contribute to predicting its next position
            if ( ( (frameStep > 0) && (*it2 <= start) ) || ( (frameStep < 0) && (*it2 >= start) ) ) {
                previousFramesOrdered.insert( PreviouslyComputedTrackFrame(TimeValue(*it2), true) );
            }
        }


        //For all already tracked frames which are not keyframes, add them to the AutoTrack too
        std::set<double> centerKeys;
        t->natronMarker->getCenterKeyframes(&centerKeys);

        for (std::set<double>::iterator it2 = centerKeys.begin(); it2 != centerKeys.end(); ++it2) {
            if ( userKeys.find(*it2) != userKeys.end() ) {
                continue;
            }

            // Add the marker to the markers ordered only if it can contribute to predicting its next position
            if ( ( ( (frameStep > 0) && (*it2 < start) ) || ( (frameStep < 0) && (*it2 > start) ) ) ) {
                previousFramesOrdered.insert( PreviouslyComputedTrackFrame(TimeValue(*it2), false) );
            }
        }


        // Taken from libmv, only initialize the filter to this amount of frames (max)
        const int max_frames_to_predict_from = 20;
        std::list<mv::Marker> previouslyComputedMarkersOrdered;

        // Find the first keyframe that's not considered to go before start or end
        PreviouslyTrackedFrameSet::iterator prevFramesIt = previousFramesOrdered.lower_bound(PreviouslyComputedTrackFrame(start, false));
        if (frameStep < 0) {
            if (prevFramesIt != previousFramesOrdered.end()) {
                while (prevFramesIt != previousFramesOrdered.end() && (int)previouslyComputedMarkersOrdered.size() != max_frames_to_predict_from) {

                    mv::Marker mvMarker;

                    TrackerHelperPrivate::natronTrackerToLibMVTracker(true, enabledChannels, *t->natronMarker, trackIndex, TimeValue(prevFramesIt->frame), frameStep, formatHeight, &mvMarker);
                    trackContext->AddMarker(mvMarker);

                    // insert in the front of the list so that the order is reversed
                    previouslyComputedMarkersOrdered.push_front(mvMarker);
                    ++prevFramesIt;
                }
            }
            // previouslyComputedMarkersOrdered is now ordererd by decreasing order
        } else {

            if (prevFramesIt != previousFramesOrdered.end()) {
                while (prevFramesIt != previousFramesOrdered.begin() && (int)previouslyComputedMarkersOrdered.size() != max_frames_to_predict_from) {

                    mv::Marker mvMarker;

                    TrackerHelperPrivate::natronTrackerToLibMVTracker(true, enabledChannels, *t->natronMarker, trackIndex, TimeValue(prevFramesIt->frame), frameStep, formatHeight, &mvMarker);
                    trackContext->AddMarker(mvMarker);

                    // insert in the front of the list so that the order is reversed
                    previouslyComputedMarkersOrdered.push_front(mvMarker);
                    --prevFramesIt;
                }
                if (prevFramesIt == previousFramesOrdered.begin() && (int)previouslyComputedMarkersOrdered.size() != max_frames_to_predict_from) {
                    mv::Marker mvMarker;

                    TrackerHelperPrivate::natronTrackerToLibMVTracker(true, enabledChannels, *t->natronMarker, trackIndex, TimeValue(prevFramesIt->frame), frameStep, formatHeight, &mvMarker);
                    trackContext->AddMarker(mvMarker);

                    // insert in the front of the list so that the order is reversed
                    previouslyComputedMarkersOrdered.push_front(mvMarker);

                }
            }
            // previouslyComputedMarkersOrdered is now ordererd by increasing order
        }


        // There must be at least 1 marker at the start time
        assert( !previouslyComputedMarkersOrdered.empty() );

        // Initialise the kalman state with the marker at the position

        std::list<mv::Marker>::iterator mIt = previouslyComputedMarkersOrdered.begin();
        t->mvState.Init(*mIt, frameStep);
        ++mIt;
        for (; mIt != previouslyComputedMarkersOrdered.end(); ++mIt) {
            mv::Marker predictedMarker;
            if ( !t->mvState.PredictForward(mIt->frame, &predictedMarker) ) {
                break;
            } else {
                t->mvState.Update(*mIt);
            }
        }


        t->mvOptions = mvOptions;
        trackAndOptions.push_back(t);
    }
    
    
    /*
     Launch tracking in the scheduler thread.
     */
    boost::shared_ptr<TrackArgs> args( new TrackArgs(start, end, frameStep, trackerNode->getApp()->getTimeLine(), viewer, trackContext, accessor, trackAndOptions, formatWidth, formatHeight, autoKeyingOnEnabledParamEnabled) );
    _imp->scheduler->track(args);
} // TrackerHelper::trackMarkers
コード例 #7
0
void
TrackerNodePrivate::solveTransformParams()
{
    setTransformOutOfDate(false);

    std::vector<TrackMarkerPtr> markers;

    knobsTable->getAllMarkers(&markers);
    if ( markers.empty() ) {
        return;
    }

    resetTransformParamsAnimation();

    KnobChoicePtr motionTypeKnob = motionType.lock();
    int motionType_i = motionTypeKnob->getValue();
    TrackerMotionTypeEnum type =  (TrackerMotionTypeEnum)motionType_i;
    TimeValue refTime(referenceFrame.lock()->getValue());
    int jitterPer = 0;
    bool jitterAdd = false;
    switch (type) {
        case eTrackerMotionTypeNone:

            return;
        case eTrackerMotionTypeMatchMove:
        case eTrackerMotionTypeStabilize:
            break;
        case eTrackerMotionTypeAddJitter:
        case eTrackerMotionTypeRemoveJitter: {
            jitterPer = jitterPeriod.lock()->getValue();
            jitterAdd = type == eTrackerMotionTypeAddJitter;
            break;
        }
    }

    setSolverParamsEnabled(false);

    std::set<TimeValue> keyframes;
    {
        for (std::size_t i = 0; i < markers.size(); ++i) {
            std::set<double> keys;
            markers[i]->getCenterKeyframes(&keys);
            for (std::set<double>::iterator it = keys.begin(); it != keys.end(); ++it) {
                keyframes.insert(TimeValue(*it));
            }
        }
    }
    KnobChoicePtr transformTypeKnob = transformType.lock();
    assert(transformTypeKnob);
    int transformType_i = transformTypeKnob->getValue();
    TrackerTransformNodeEnum transformType = (TrackerTransformNodeEnum)transformType_i;
    NodePtr node = publicInterface->getNode();

    invertTransform.lock()->setValue(type == eTrackerMotionTypeStabilize);

    KnobDoublePtr centerKnob = center.lock();

    // Set the center at the reference frame
    Point centerValue = {0, 0};
    int nSamplesAtRefTime = 0;
    for (std::size_t i = 0; i < markers.size(); ++i) {
        if ( !markers[i]->isEnabled(refTime) ) {
            continue;
        }
        KnobDoublePtr markerCenterKnob = markers[i]->getCenterKnob();

        centerValue.x += markerCenterKnob->getValueAtTime(refTime);
        centerValue.y += markerCenterKnob->getValueAtTime(refTime, DimIdx(1));
        ++nSamplesAtRefTime;
    }
    if (nSamplesAtRefTime) {
        centerValue.x /= nSamplesAtRefTime;
        centerValue.y /= nSamplesAtRefTime;
        {
            std::vector<double> values(2);
            values[0] = centerValue.x;
            values[1] = centerValue.y;
            centerKnob->setValueAcrossDimensions(values);
        }

    }

    bool robust;
    robust = robustModel.lock()->getValue();

    KnobDoublePtr maxFittingErrorKnob = fittingErrorWarnIfAbove.lock();
    const double maxFittingError = maxFittingErrorKnob->getValue();

    node->getApp()->progressStart( node, tr("Solving for transform parameters...").toStdString(), std::string() );

    lastSolveRequest.refTime = refTime;
    lastSolveRequest.jitterPeriod = jitterPer;
    lastSolveRequest.jitterAdd = jitterAdd;
    lastSolveRequest.allMarkers = markers;
    lastSolveRequest.keyframes = keyframes;
    lastSolveRequest.robustModel = robust;
    lastSolveRequest.maxFittingError = maxFittingError;

    switch (transformType) {
        case eTrackerTransformNodeTransform:
            computeTransformParamsFromTracks();
            break;
        case eTrackerTransformNodeCornerPin:
            computeCornerParamsFromTracks();
            break;
    }
} // TrackerNodePrivate::solveTransformParams
コード例 #8
0
bool
CornerPinOverlayInteract::onOverlayPenMotion(TimeValue time,
                                             const RenderScale & /*renderScale*/,
                                             ViewIdx view,
                                             const QPointF & /*viewportPos*/,
                                             const QPointF & penPos,
                                             double /*pressure*/,
                                             TimeValue /*timestamp*/)
{
    // do not show interact if knob is secret or not enabled
    // see https://github.com/MrKepzie/Natron/issues/932
    KnobDoublePtr from1Knob = _imp->from[0].lock();

    if ( !from1Knob || !from1Knob->shouldDrawOverlayInteract() ) {
        return false;
    }

    RenderScale pscale;
    getPixelScale(pscale.x, pscale.y);

    OfxPointD to[4];
    OfxPointD from[4];
    bool enable[4];
    bool useFrom;

    if (_imp->dragging == -1) {
        for (int i = 0; i < 4; ++i) {
            _imp->getFrom(time, i, &from[i].x, &from[i].y);
            _imp->getTo(time, i, &to[i].x, &to[i].y);
            enable[i] = _imp->getEnabled(time, i);
        }
        useFrom = _imp->getUseFromPoints(time);
    } else {
        for (int i = 0; i < 4; ++i) {
            to[i] = _imp->toDrag[i];
            from[i] = _imp->fromDrag[i];
            enable[i] = _imp->enableDrag[i];
        }
        useFrom = _imp->useFromDrag;
    }

    if (!useFrom && !_imp->areToPointsAnimated()) {
        return false;
    }

    OfxPointD p[4];
    OfxPointD q[4];
    int enableBegin = 4;
    int enableEnd = 0;
    for (int i = 0; i < 4; ++i) {
        if (enable[i]) {
            if (useFrom) {
                p[i] = from[i];
                q[i] = to[i];
            } else {
                q[i] = from[i];
                p[i] = to[i];
            }
            if (i < enableBegin) {
                enableBegin = i;
            }
            if (i + 1 > enableEnd) {
                enableEnd = i + 1;
            }
        }
    }
    bool didSomething = false;
    bool valuesChanged = false;
    OfxPointD delta;
    delta.x = penPos.x() - _imp->lastPenPos.x();
    delta.y = penPos.y() - _imp->lastPenPos.y();

    _imp->hovering = -1;

    for (int i = enableBegin; i < enableEnd; ++i) {
        if (enable[i]) {
            if (_imp->dragging == i) {
                if (useFrom) {
                    from[i].x += delta.x;
                    from[i].y += delta.y;
                    _imp->fromDrag[i] = from[i];
                } else {
                    to[i].x += delta.x;
                    to[i].y += delta.y;
                    _imp->toDrag[i] = to[i];
                }
                valuesChanged = true;
            } else if ( CornerPinOverlayInteractPrivate::isNearby(penPos, p[i].x, p[i].y, CornerPinOverlayInteractPrivate::pointTolerance(), pscale) ) {
                _imp->hovering = i;
                didSomething = true;
            }
        }
    }

    if ( (_imp->dragging != -1) && _imp->interactiveDrag && valuesChanged ) {
        // no need to redraw overlay since it is slave to the paramaters

        if (_imp->useFromDrag) {
            KnobDoublePtr knob = _imp->from[_imp->dragging].lock();
            assert(knob);
            std::vector<double> val(2);
            val[0] = from[_imp->dragging].x;
            val[1] = from[_imp->dragging].y;
            knob->setValueAcrossDimensions(val, DimIdx(0), view, eValueChangedReasonUserEdited);
        } else {
            KnobDoublePtr knob = _imp->to[_imp->dragging].lock();
            assert(knob);
            std::vector<double> val(2);
            val[0] = to[_imp->dragging].x;
            val[1] = to[_imp->dragging].y;

            if (_imp->toPointsAutoKeyingEnabled) {
                knob->setValueAtTimeAcrossDimensions(time, val, DimIdx(0), view, eValueChangedReasonUserEdited);

                // Also set a keyframe on other points
                for (int i = 0; i < 4; ++i) {
                    if (i == _imp->dragging) {
                        continue;
                    }
                    std::vector<double> values(2);
                    KnobDoublePtr toPoint = _imp->to[i].lock();
                    values[0] = toPoint->getValueAtTime(time, DimIdx(0));
                    values[1] = toPoint->getValueAtTime(time, DimIdx(1));
                    toPoint->setValueAtTimeAcrossDimensions(time, values, DimIdx(0), view, eValueChangedReasonUserEdited);
                }
            } else {
                knob->setValueAcrossDimensions(val, DimIdx(0), view, eValueChangedReasonUserEdited);
            }
        }
    }

    _imp->lastPenPos = penPos;
    
    return didSomething || valuesChanged;
} // onOverlayPenMotion
コード例 #9
0
bool
PointOverlayInteract::onOverlayPenMotion(TimeValue time,
                                         const RenderScale & /*renderScale*/,
                                         ViewIdx view,
                                         const QPointF & /*viewportPos*/,
                                         const QPointF & penPos,
                                         double /*pressure*/,
                                         TimeValue /*timestamp*/)
{
    KnobDoublePtr knob = _imp->param.lock();

    // do not show interact if knob is secret or not enabled
    // see https://github.com/MrKepzie/Natron/issues/932
    if ( !knob || !knob->shouldDrawOverlayInteract() ) {
        return false;
    }

    RenderScale pscale;
    getPixelScale(pscale.x, pscale.y);

    QPointF pos;
    if (_imp->state == ePositionInteractStatePicked) {
        pos = _imp->lastPenPos;
    } else {
        double p[2];
        for (int i = 0; i < 2; ++i) {
            p[i] = knob->getValueAtTime(time, DimIdx(i));
            if (knob->getValueIsNormalized(DimIdx(i)) != eValueIsNormalizedNone) {
                p[i] = knob->denormalize(DimIdx(i), time, p[i]);
            }
        }
        pos.setX(p[0]);
        pos.setY(p[1]);
    }

    bool didSomething = false;
    bool valuesChanged = false;

    switch (_imp->state) {
        case ePositionInteractStateInactive:
        case ePositionInteractStatePoised: {
            // are we in the box, become 'poised'
            PositionInteractState newState;
            if ( ( std::fabs( penPos.x() - pos.x() ) <= _imp->pointTolerance() * pscale.x) &&
                ( std::fabs( penPos.y() - pos.y() ) <= _imp->pointTolerance() * pscale.y) ) {
                newState = ePositionInteractStatePoised;
            } else {
                newState = ePositionInteractStateInactive;
            }

            if (_imp->state != newState) {
                // state changed, must redraw
                redraw();
            }
            _imp->state = newState;
            //}
            break;
        }

        case ePositionInteractStatePicked: {
            valuesChanged = true;
            break;
        }
    }
    didSomething = (_imp->state == ePositionInteractStatePoised) || (_imp->state == ePositionInteractStatePicked);

    if ( (_imp->state != ePositionInteractStateInactive) && _imp->interactiveDrag && valuesChanged ) {
        std::vector<double> p(2);
        p[0] = fround(_imp->lastPenPos.x(), pscale.x);
        p[1] = fround(_imp->lastPenPos.y(), pscale.y);
        for (int i = 0; i < 2; ++i) {
            if (knob->getValueIsNormalized(DimIdx(i)) != eValueIsNormalizedNone) {
                p[i] = knob->normalize(DimIdx(i), time, p[i]);
            }
        }


        knob->setValueAcrossDimensions(p, DimIdx(0), ViewSetSpec(view), eValueChangedReasonUserEdited);
    }

    _imp->lastPenPos = penPos;

    return (didSomething || valuesChanged);
} // onOverlayPenMotion