view layer/RegionLayer.cpp @ 1447:8afea53332f3 single-point

Add option to make pane sizes auto-resize-only (i.e. remove user control via a splitter); also place alignment views above panes instead of below, meaning the extra bit of space that we currently have for the pane without one at least goes to the primary pane

/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */

/*
    Sonic Visualiser
    An audio file viewer and annotation editor.
    Centre for Digital Music, Queen Mary, University of London.
    This file copyright 2006-2008 Chris Cannam and QMUL.
    
    This program is free software; you can redistribute it and/or
    modify it under the terms of the GNU General Public License as
    published by the Free Software Foundation; either version 2 of the
    License, or (at your option) any later version.  See the file
    COPYING included with this distribution for more information.
*/

#include "RegionLayer.h"

#include "data/model/Model.h"
#include "base/RealTime.h"
#include "base/Profiler.h"
#include "base/LogRange.h"

#include "ColourDatabase.h"
#include "ColourMapper.h"
#include "LinearNumericalScale.h"
#include "LogNumericalScale.h"
#include "LinearColourScale.h"
#include "LogColourScale.h"
#include "PaintAssistant.h"

#include "view/View.h"

#include "data/model/RegionModel.h"

#include "widgets/ItemEditDialog.h"
#include "widgets/TextAbbrev.h"

#include <QPainter>
#include <QPainterPath>
#include <QMouseEvent>
#include <QTextStream>
#include <QMessageBox>

#include <iostream>
#include <cmath>

RegionLayer::RegionLayer() :
    SingleColourLayer(),
    m_model(nullptr),
    m_editing(false),
    m_dragPointX(0),
    m_dragPointY(0),
    m_dragStartX(0),
    m_dragStartY(0),
    m_originalPoint(0, 0.0, 0, tr("New Region")),
    m_editingPoint(0, 0.0, 0, tr("New Region")),
    m_editingCommand(nullptr),
    m_verticalScale(EqualSpaced),
    m_colourMap(0),
    m_colourInverted(false),
    m_plotStyle(PlotLines)
{
    
}

void
RegionLayer::setModel(RegionModel *model)
{
    if (m_model == model) return;
    m_model = model;

    connectSignals(m_model);

    connect(m_model, SIGNAL(modelChanged()), this, SLOT(recalcSpacing()));
    recalcSpacing();

//    SVDEBUG << "RegionLayer::setModel(" << model << ")" << endl;

    if (m_model && m_model->getRDFTypeURI().endsWith("Segment")) {
        setPlotStyle(PlotSegmentation);
    }
    if (m_model && m_model->getRDFTypeURI().endsWith("Change")) {
        setPlotStyle(PlotSegmentation);
    }

    emit modelReplaced();
}

Layer::PropertyList
RegionLayer::getProperties() const
{
    PropertyList list = SingleColourLayer::getProperties();
    list.push_back("Vertical Scale");
    list.push_back("Scale Units");
    list.push_back("Plot Type");
    return list;
}

QString
RegionLayer::getPropertyLabel(const PropertyName &name) const
{
    if (name == "Vertical Scale") return tr("Vertical Scale");
    if (name == "Scale Units") return tr("Scale Units");
    if (name == "Plot Type") return tr("Plot Type");
    return SingleColourLayer::getPropertyLabel(name);
}

Layer::PropertyType
RegionLayer::getPropertyType(const PropertyName &name) const
{
    if (name == "Scale Units") return UnitsProperty;
    if (name == "Vertical Scale") return ValueProperty;
    if (name == "Plot Type") return ValueProperty;
    if (name == "Colour" && m_plotStyle == PlotSegmentation) return ValueProperty;
    return SingleColourLayer::getPropertyType(name);
}

QString
RegionLayer::getPropertyGroupName(const PropertyName &name) const
{
    if (name == "Vertical Scale" || name == "Scale Units") {
        return tr("Scale");
    }
    return SingleColourLayer::getPropertyGroupName(name);
}

int
RegionLayer::getPropertyRangeAndValue(const PropertyName &name,
                                    int *min, int *max, int *deflt) const
{
    int val = 0;

    if (name == "Colour" && m_plotStyle == PlotSegmentation) {
            
        if (min) *min = 0;
        if (max) *max = ColourMapper::getColourMapCount() - 1;
        if (deflt) *deflt = 0;
        
        val = m_colourMap;

    } else if (name == "Plot Type") {
        
        if (min) *min = 0;
        if (max) *max = 1;
        if (deflt) *deflt = 0;
        
        val = int(m_plotStyle);

    } else if (name == "Vertical Scale") {
        
        if (min) *min = 0;
        if (max) *max = 3;
        if (deflt) *deflt = int(EqualSpaced);
        
        val = int(m_verticalScale);

    } else if (name == "Scale Units") {

        if (deflt) *deflt = 0;
        if (m_model) {
            val = UnitDatabase::getInstance()->getUnitId
                (getScaleUnits());
        }

    } else {

        val = SingleColourLayer::getPropertyRangeAndValue(name, min, max, deflt);
    }

    return val;
}

QString
RegionLayer::getPropertyValueLabel(const PropertyName &name,
                                   int value) const
{
    if (name == "Colour" && m_plotStyle == PlotSegmentation) {
        return ColourMapper::getColourMapLabel(value);
    } else if (name == "Plot Type") {

        switch (value) {
        default:
        case 0: return tr("Bars");
        case 1: return tr("Segmentation");
        }

    } else if (name == "Vertical Scale") {
        switch (value) {
        default:
        case 0: return tr("Auto-Align");
        case 1: return tr("Equal Spaced");
        case 2: return tr("Linear");
        case 3: return tr("Log");
        }
    }
    return SingleColourLayer::getPropertyValueLabel(name, value);
}

void
RegionLayer::setProperty(const PropertyName &name, int value)
{
    if (name == "Colour" && m_plotStyle == PlotSegmentation) {
        setFillColourMap(value);
    } else if (name == "Plot Type") {
        setPlotStyle(PlotStyle(value));
    } else if (name == "Vertical Scale") {
        setVerticalScale(VerticalScale(value));
    } else if (name == "Scale Units") {
        if (m_model) {
            m_model->setScaleUnits
                (UnitDatabase::getInstance()->getUnitById(value));
            emit modelChanged();
        }
    } else {
        return SingleColourLayer::setProperty(name, value);
    }
}

void
RegionLayer::setFillColourMap(int map)
{
    if (m_colourMap == map) return;
    m_colourMap = map;
    emit layerParametersChanged();
}

void
RegionLayer::setPlotStyle(PlotStyle style)
{
    if (m_plotStyle == style) return;
    bool colourTypeChanged = (style == PlotSegmentation ||
                              m_plotStyle == PlotSegmentation);
    m_plotStyle = style;
    if (colourTypeChanged) {
        emit layerParameterRangesChanged();
    }
    emit layerParametersChanged();
}

void
RegionLayer::setVerticalScale(VerticalScale scale)
{
    if (m_verticalScale == scale) return;
    m_verticalScale = scale;
    emit layerParametersChanged();
}

bool
RegionLayer::isLayerScrollable(const LayerGeometryProvider *v) const
{
    QPoint discard;
    return !v->shouldIlluminateLocalFeatures(this, discard);
}

void
RegionLayer::recalcSpacing()
{
    m_spacingMap.clear();
    m_distributionMap.clear();
    if (!m_model) return;

//    SVDEBUG << "RegionLayer::recalcSpacing" << endl;

    EventVector allEvents = m_model->getAllEvents();
    for (const Event &e: allEvents) {
        m_distributionMap[e.getValue()]++;
//        SVDEBUG << "RegionLayer::recalcSpacing: value found: " << e.getValue() << " (now have " << m_distributionMap[e.getValue()] << " of this value)" <<  endl;
    }

    int n = 0;

    for (SpacingMap::const_iterator i = m_distributionMap.begin();
         i != m_distributionMap.end(); ++i) {
        m_spacingMap[i->first] = n++;
//        SVDEBUG << "RegionLayer::recalcSpacing: " << i->first << " -> " << m_spacingMap[i->first] << endl;
    }
}

bool
RegionLayer::getValueExtents(double &min, double &max,
                           bool &logarithmic, QString &unit) const
{
    if (!m_model) return false;
    min = m_model->getValueMinimum();
    max = m_model->getValueMaximum();
    unit = getScaleUnits();

    if (m_verticalScale == LogScale) logarithmic = true;

    return true;
}

bool
RegionLayer::getDisplayExtents(double &min, double &max) const
{
    if (!m_model ||
        m_verticalScale == AutoAlignScale ||
        m_verticalScale == EqualSpaced) return false;

    min = m_model->getValueMinimum();
    max = m_model->getValueMaximum();

    return true;
}

EventVector
RegionLayer::getLocalPoints(LayerGeometryProvider *v, int x) const
{
    if (!m_model) return EventVector();

    sv_frame_t frame = v->getFrameForX(x);

    EventVector local = m_model->getEventsCovering(frame);
    if (!local.empty()) return local;

    int fuzz = ViewManager::scalePixelSize(2);
    sv_frame_t start = v->getFrameForX(x - fuzz);
    sv_frame_t end = v->getFrameForX(x + fuzz);

    local = m_model->getEventsStartingWithin(frame, end - frame);
    if (!local.empty()) return local;

    local = m_model->getEventsSpanning(start, frame - start);
    if (!local.empty()) return local;

    return {};
}

bool
RegionLayer::getPointToDrag(LayerGeometryProvider *v, int x, int y, Event &point) const
{
    if (!m_model) return false;

    sv_frame_t frame = v->getFrameForX(x);

    EventVector onPoints = m_model->getEventsCovering(frame);
    if (onPoints.empty()) return false;

    int nearestDistance = -1;
    for (const auto &p: onPoints) {
        int distance = getYForValue(v, p.getValue()) - y;
        if (distance < 0) distance = -distance;
        if (nearestDistance == -1 || distance < nearestDistance) {
            nearestDistance = distance;
            point = p;
        }
    }

    return true;
}

QString
RegionLayer::getLabelPreceding(sv_frame_t frame) const
{
    if (!m_model) return "";
    EventVector points = m_model->getEventsStartingWithin
        (m_model->getStartFrame(), frame - m_model->getStartFrame());
    if (!points.empty()) {
        for (auto i = points.rbegin(); i != points.rend(); ++i) {
            if (i->getLabel() != QString()) {
                return i->getLabel();
            }
        }
    }
    return QString();
}

QString
RegionLayer::getFeatureDescription(LayerGeometryProvider *v, QPoint &pos) const
{
    int x = pos.x();

    if (!m_model || !m_model->getSampleRate()) return "";

    EventVector points = getLocalPoints(v, x);

    if (points.empty()) {
        if (!m_model->isReady()) {
            return tr("In progress");
        } else {
            return tr("No local points");
        }
    }

    Event region;
    EventVector::iterator i;

    //!!! harmonise with whatever decision is made about point y
    //!!! coords in paint method

    for (i = points.begin(); i != points.end(); ++i) {

        int y = getYForValue(v, i->getValue());
        int h = 3;

        if (m_model->getValueQuantization() != 0.0) {
            h = y - getYForValue
                (v, i->getValue() + m_model->getValueQuantization());
            if (h < 3) h = 3;
        }

        if (pos.y() >= y - h && pos.y() <= y) {
            region = *i;
            break;
        }
    }

    if (i == points.end()) return tr("No local points");

    RealTime rt = RealTime::frame2RealTime(region.getFrame(),
                                           m_model->getSampleRate());
    RealTime rd = RealTime::frame2RealTime(region.getDuration(),
                                           m_model->getSampleRate());
    
    QString valueText;

    valueText = tr("%1 %2").arg(region.getValue()).arg(getScaleUnits());

    QString text;

    if (region.getLabel() == "") {
        text = QString(tr("Time:\t%1\nValue:\t%2\nDuration:\t%3\nNo label"))
            .arg(rt.toText(true).c_str())
            .arg(valueText)
            .arg(rd.toText(true).c_str());
    } else {
        text = QString(tr("Time:\t%1\nValue:\t%2\nDuration:\t%3\nLabel:\t%4"))
            .arg(rt.toText(true).c_str())
            .arg(valueText)
            .arg(rd.toText(true).c_str())
            .arg(region.getLabel());
    }

    pos = QPoint(v->getXForFrame(region.getFrame()),
                 getYForValue(v, region.getValue()));
    return text;
}

bool
RegionLayer::snapToFeatureFrame(LayerGeometryProvider *v, sv_frame_t &frame,
                                int &resolution,
                                SnapType snap) const
{
    if (!m_model) {
        return Layer::snapToFeatureFrame(v, frame, resolution, snap);
    }

    // SnapLeft / SnapRight: return frame of nearest feature in that
    // direction no matter how far away
    //
    // SnapNeighbouring: return frame of feature that would be used in
    // an editing operation, i.e. closest feature in either direction
    // but only if it is "close enough"

    resolution = m_model->getResolution();

    if (snap == SnapNeighbouring) {
        EventVector points = getLocalPoints(v, v->getXForFrame(frame));
        if (points.empty()) return false;
        frame = points.begin()->getFrame();
        return true;
    }    

    // Normally we snap to the start frame of whichever event we
    // find. However here, for SnapRight only, if the end frame of
    // whichever event we would have snapped to had we been snapping
    // left is closer than the start frame of the next event to the
    // right, then we snap to that frame instead. Clear?
    
    Event left;
    bool haveLeft = false;
    if (m_model->getNearestEventMatching
        (frame, [](Event) { return true; }, EventSeries::Backward, left)) {
        haveLeft = true;
    }

    if (snap == SnapLeft) {
        frame = left.getFrame();
        return haveLeft;
    }

    Event right;
    bool haveRight = false;
    if (m_model->getNearestEventMatching
        (frame, [](Event) { return true; }, EventSeries::Forward, right)) {
        haveRight = true;
    }

    if (haveLeft) {
        sv_frame_t leftEnd = left.getFrame() + left.getDuration();
        if (leftEnd > frame) {
            if (haveRight) {
                if (leftEnd - frame < right.getFrame() - frame) {
                    frame = leftEnd;
                } else {
                    frame = right.getFrame();
                }
            } else {
                frame = leftEnd;
            }
            return true;
        }
    }

    if (haveRight) {
        frame = right.getFrame();
        return true;
    }

    return false;
}

bool
RegionLayer::snapToSimilarFeature(LayerGeometryProvider *v, sv_frame_t &frame,
                                  int &resolution,
                                  SnapType snap) const
{
    if (!m_model) {
        return Layer::snapToSimilarFeature(v, frame, resolution, snap);
    }

    // snap is only permitted to be SnapLeft or SnapRight here.  We
    // don't do the same trick as in snapToFeatureFrame, of snapping
    // to the end of a feature sometimes.
    
    resolution = m_model->getResolution();

    Event ref;
    Event e;
    float matchvalue;
    bool found;

    found = m_model->getNearestEventMatching
        (frame, [](Event) { return true; }, EventSeries::Backward, ref);

    if (!found) {
        return false;
    }

    matchvalue = ref.getValue();
    
    found = m_model->getNearestEventMatching
        (frame,
         [matchvalue](Event e) {
             double epsilon = 0.0001;
             return fabs(e.getValue() - matchvalue) < epsilon;
         },
         snap == SnapLeft ? EventSeries::Backward : EventSeries::Forward,
         e);

    if (!found) {
        return false;
    }

    frame = e.getFrame();
    return true;
}

QString
RegionLayer::getScaleUnits() const
{
    if (m_model) return m_model->getScaleUnits();
    else return "";
}

void
RegionLayer::getScaleExtents(LayerGeometryProvider *v, double &min, double &max, bool &log) const
{
    min = 0.0;
    max = 0.0;
    log = false;

    QString queryUnits;
    queryUnits = getScaleUnits();

    if (m_verticalScale == AutoAlignScale) {

        if (!v->getValueExtents(queryUnits, min, max, log)) {

            min = m_model->getValueMinimum();
            max = m_model->getValueMaximum();

//            cerr << "RegionLayer[" << this << "]::getScaleExtents: min = " << min << ", max = " << max << ", log = " << log << endl;

        } else if (log) {

            LogRange::mapRange(min, max);

//            cerr << "RegionLayer[" << this << "]::getScaleExtents: min = " << min << ", max = " << max << ", log = " << log << endl;

        }

    } else if (m_verticalScale == EqualSpaced) {

        if (!m_spacingMap.empty()) {
            SpacingMap::const_iterator i = m_spacingMap.begin();
            min = i->second;
            i = m_spacingMap.end();
            --i;
            max = i->second;
//            cerr << "RegionLayer[" << this << "]::getScaleExtents: equal spaced; min = " << min << ", max = " << max << ", log = " << log << endl;
        }

    } else {

        min = m_model->getValueMinimum();
        max = m_model->getValueMaximum();

        if (m_verticalScale == LogScale) {
            LogRange::mapRange(min, max);
            log = true;
        }
    }

    if (max == min) max = min + 1.0;
}

int
RegionLayer::spacingIndexToY(LayerGeometryProvider *v, int i) const
{
    int h = v->getPaintHeight();
    int n = int(m_spacingMap.size());
    // this maps from i (spacing of the value from the spacing
    // map) and n (number of region types) to y
    int y = h - (((h * i) / n) + (h / (2 * n)));
    return y;
}

double
RegionLayer::yToSpacingIndex(LayerGeometryProvider *v, int y) const
{
    // we return an inexact result here (double rather than int)
    int h = v->getPaintHeight();
    int n = int(m_spacingMap.size());
    // from y = h - ((h * i) / n) + (h / (2 * n)) as above (vh taking place of i)
    double vh = double(2*h*n - h - 2*n*y) / double(2*h);
    return vh;
}

int
RegionLayer::getYForValue(LayerGeometryProvider *v, double val) const
{
    double min = 0.0, max = 0.0;
    bool logarithmic = false;
    int h = v->getPaintHeight();

    if (m_verticalScale == EqualSpaced) {

        if (m_spacingMap.empty()) return h/2;
        
        SpacingMap::const_iterator i = m_spacingMap.lower_bound(val);
        //!!! what now, if i->first != v?

        int y = spacingIndexToY(v, i->second);

//        SVDEBUG << "RegionLayer::getYForValue: value " << val << " -> i->second " << i->second << " -> y " << y << endl;
        return y;


    } else {

        getScaleExtents(v, min, max, logarithmic);

//    cerr << "RegionLayer[" << this << "]::getYForValue(" << val << "): min = " << min << ", max = " << max << ", log = " << logarithmic << endl;
//    cerr << "h = " << h << ", margin = " << margin << endl;

        if (logarithmic) {
            val = LogRange::map(val);
        }

        return int(h - ((val - min) * h) / (max - min));
    }
}

double
RegionLayer::getValueForY(LayerGeometryProvider *v, int y) const
{
    return getValueForY(v, y, -1);
}

double
RegionLayer::getValueForY(LayerGeometryProvider *v, int y, int avoid) const
{
    double min = 0.0, max = 0.0;
    bool logarithmic = false;
    int h = v->getPaintHeight();

    if (m_verticalScale == EqualSpaced) {

        // if we're equal spaced, we probably want to snap to the
        // nearest item when close to it, and give some notification
        // that we're doing so

        if (m_spacingMap.empty()) return 1.f;

        // n is the number of distinct regions.  if we are close to
        // one of the m/n divisions in the y scale, we should snap to
        // the value of the mth region.

        double vh = yToSpacingIndex(v, y);

        // spacings in the map are integral, so find the closest one,
        // map it back to its y coordinate, and see how far we are
        // from it

        int n = int(m_spacingMap.size());
        int ivh = int(lrint(vh));
        if (ivh < 0) ivh = 0;
        if (ivh > n-1) ivh = n-1;
        int iy = spacingIndexToY(v, ivh);

        int dist = iy - y;
        int gap = h / n; // between region lines

//        cerr << "getValueForY: y = " << y << ", vh = " << vh << ", ivh = " << ivh << " of " << n << ", iy = " << iy << ", dist = " << dist << ", gap = " << gap << endl;

        SpacingMap::const_iterator i = m_spacingMap.begin();
        while (i != m_spacingMap.end()) {
            if (i->second == ivh) break;
            ++i;
        }
        if (i == m_spacingMap.end()) i = m_spacingMap.begin();

//        cerr << "nearest existing value = " << i->first << " at " << iy << endl;

        double val = 0;

//        cerr << "note: avoid = " << avoid << ", i->second = " << i->second << endl;

        if (dist < -gap/3 &&
            ((avoid == -1) ||
             (avoid != i->second && avoid != i->second - 1))) {
            // bisect gap to prior
            if (i == m_spacingMap.begin()) {
                val = i->first - 1.f;
//                cerr << "extended down to " << val << endl;
            } else {
                SpacingMap::const_iterator j = i;
                --j;
                val = (i->first + j->first) / 2;
//                cerr << "bisected down to " << val << endl;
            }
        } else if (dist > gap/3 &&
                   ((avoid == -1) ||
                    (avoid != i->second && avoid != i->second + 1))) {
            // bisect gap to following
            SpacingMap::const_iterator j = i;
            ++j;
            if (j == m_spacingMap.end()) {
                val = i->first + 1.f;
//                cerr << "extended up to " << val << endl;
            } else {
                val = (i->first + j->first) / 2;
//                cerr << "bisected up to " << val << endl;
            }
        } else {
            // snap
            val = i->first;
//            cerr << "snapped to " << val << endl;
        }            

        return val;

    } else {

        getScaleExtents(v, min, max, logarithmic);

        double val = min + (double(h - y) * double(max - min)) / h;

        if (logarithmic) {
            val = pow(10.0, val);
        }

        return val;
    }
}

QColor
RegionLayer::getColourForValue(LayerGeometryProvider *v, double val) const
{
    double min, max;
    bool log;
    getScaleExtents(v, min, max, log);

    if (min > max) std::swap(min, max);
    if (max == min) max = min + 1;

    if (log) {
        LogRange::mapRange(min, max);
        val = LogRange::map(val);
    }

//    SVDEBUG << "RegionLayer::getColourForValue: min " << min << ", max "
//              << max << ", log " << log << ", value " << val << endl;

    QColor solid = ColourMapper(m_colourMap, m_colourInverted, min, max).map(val);
    return QColor(solid.red(), solid.green(), solid.blue(), 120);
}

int
RegionLayer::getDefaultColourHint(bool darkbg, bool &impose)
{
    impose = false;
    return ColourDatabase::getInstance()->getColourIndex
        (QString(darkbg ? "Bright Blue" : "Blue"));
}

void
RegionLayer::paint(LayerGeometryProvider *v, QPainter &paint, QRect rect) const
{
    if (!m_model || !m_model->isOK()) return;

    sv_samplerate_t sampleRate = m_model->getSampleRate();
    if (!sampleRate) return;

//    Profiler profiler("RegionLayer::paint", true);

    int x0 = rect.left() - 40, x1 = rect.right();

    sv_frame_t wholeFrame0 = v->getFrameForX(0);
    sv_frame_t wholeFrame1 = v->getFrameForX(v->getPaintWidth());

    EventVector points(m_model->getEventsSpanning(wholeFrame0,
                                                  wholeFrame1 - wholeFrame0));
    if (points.empty()) return;

    paint.setPen(getBaseQColor());

    QColor brushColour(getBaseQColor());
    brushColour.setAlpha(80);

//    SVDEBUG << "RegionLayer::paint: resolution is "
//              << m_model->getResolution() << " frames" << endl;

    double min = m_model->getValueMinimum();
    double max = m_model->getValueMaximum();
    if (max == min) max = min + 1.0;

    QPoint localPos;
    Event illuminatePoint(0);
    bool shouldIlluminate = false;

    if (v->shouldIlluminateLocalFeatures(this, localPos)) {
        shouldIlluminate = getPointToDrag(v, localPos.x(), localPos.y(),
                                          illuminatePoint);
    }

    paint.save();
    paint.setRenderHint(QPainter::Antialiasing, false);
    
    //!!! point y coords if model does not haveDistinctValues() should
    //!!! be assigned to avoid overlaps

    //!!! if it does have distinct values, we should still ensure y
    //!!! coord is never completely flat on the top or bottom

    int fontHeight = paint.fontMetrics().height();

    for (EventVector::const_iterator i = points.begin();
         i != points.end(); ++i) {

        const Event &p(*i);

        int x = v->getXForFrame(p.getFrame());
        int w = v->getXForFrame(p.getFrame() + p.getDuration()) - x;
        int y = getYForValue(v, p.getValue());
        int h = 9;
        int ex = x + w;

        int gap = v->scalePixelSize(2);
        
        EventVector::const_iterator j = i;
        ++j;

        if (j != points.end()) {
            const Event &q(*j);
            int nx = v->getXForFrame(q.getFrame());
            if (nx < ex) ex = nx;
        }

        if (m_model->getValueQuantization() != 0.0) {
            h = y - getYForValue
                (v, p.getValue() + m_model->getValueQuantization());
            if (h < 3) h = 3;
        }

        if (w < 1) w = 1;

        if (m_plotStyle == PlotSegmentation) {
            paint.setPen(getForegroundQColor(v->getView()));
            paint.setBrush(getColourForValue(v, p.getValue()));
        } else {
            paint.setPen(getBaseQColor());
            paint.setBrush(brushColour);
        }

        if (m_plotStyle == PlotSegmentation) {

            if (ex <= x) continue;

            if (!shouldIlluminate || illuminatePoint != p) {

                paint.setPen(QPen(getForegroundQColor(v->getView()), 1));
                paint.drawLine(x, 0, x, v->getPaintHeight());
                paint.setPen(Qt::NoPen);

            } else {
                paint.setPen(QPen(getForegroundQColor(v->getView()), 2));
            }

            paint.drawRect(x, -1, ex - x, v->getPaintHeight() + gap);

        } else {

            if (shouldIlluminate && illuminatePoint == p) {

                paint.setPen(v->getForeground());
                paint.setBrush(v->getForeground());

                QString vlabel =
                    QString("%1%2").arg(p.getValue()).arg(getScaleUnits());
                PaintAssistant::drawVisibleText(v, paint, 
                                   x - paint.fontMetrics().width(vlabel) - gap,
                                   y + paint.fontMetrics().height()/2
                                   - paint.fontMetrics().descent(), 
                                   vlabel, PaintAssistant::OutlinedText);
                
                QString hlabel = RealTime::frame2RealTime
                    (p.getFrame(), m_model->getSampleRate()).toText(true).c_str();
                PaintAssistant::drawVisibleText(v, paint, 
                                   x,
                                   y - h/2 - paint.fontMetrics().descent() - gap,
                                   hlabel, PaintAssistant::OutlinedText);
            }
            
            paint.drawLine(x, y-1, x + w, y-1);
            paint.drawLine(x, y+1, x + w, y+1);
            paint.drawLine(x, y - h/2, x, y + h/2);
            paint.drawLine(x+w, y - h/2, x + w, y + h/2);
        }
    }

    int nextLabelMinX = -100;
    int lastLabelY = 0;

    for (EventVector::const_iterator i = points.begin();
         i != points.end(); ++i) {

        const Event &p(*i);

        int x = v->getXForFrame(p.getFrame());
        int w = v->getXForFrame(p.getFrame() + p.getDuration()) - x;
        int y = getYForValue(v, p.getValue());

        QString label = p.getLabel();
        if (label == "") {
            label = QString("%1%2").arg(p.getValue()).arg(getScaleUnits());
        }
        int labelWidth = paint.fontMetrics().width(label);

        int gap = v->scalePixelSize(2);

        if (m_plotStyle == PlotSegmentation) {
            if ((x + w < x0 && x + labelWidth + gap < x0) || x > x1) {
                continue;
            }
        } else {
            if (x + w < x0 || x - labelWidth - gap > x1) {
                continue;
            }
        }
        
        bool illuminated = false;

        if (m_plotStyle != PlotSegmentation) {
            if (shouldIlluminate && illuminatePoint == p) {
                illuminated = true;
            }
        }

        if (!illuminated) {

            int labelX, labelY;

            if (m_plotStyle != PlotSegmentation) {
                labelX = x - labelWidth - gap;
                labelY = y + paint.fontMetrics().height()/2 
                    - paint.fontMetrics().descent();
            } else {
                labelX = x + 5;
                labelY = v->getTextLabelHeight(this, paint);
                if (labelX < nextLabelMinX) {
                    if (lastLabelY < v->getPaintHeight()/2) {
                        labelY = lastLabelY + fontHeight;
                    }
                }
                lastLabelY = labelY;
                nextLabelMinX = labelX + labelWidth;
            }

            PaintAssistant::drawVisibleText(v, paint, labelX, labelY, label,
                                            PaintAssistant::OutlinedText);
        }
    }

    paint.restore();
}

int
RegionLayer::getVerticalScaleWidth(LayerGeometryProvider *v, bool, QPainter &paint) const
{
    if (!m_model || 
        m_verticalScale == AutoAlignScale || 
        m_verticalScale == EqualSpaced) {
        return 0;
    } else if (m_plotStyle == PlotSegmentation) {
        if (m_verticalScale == LogScale) {
            return LogColourScale().getWidth(v, paint);
        } else {
            return LinearColourScale().getWidth(v, paint);
        }
    } else {
        if (m_verticalScale == LogScale) {
            return LogNumericalScale().getWidth(v, paint);
        } else {
            return LinearNumericalScale().getWidth(v, paint);
        }
    }
}

void
RegionLayer::paintVerticalScale(LayerGeometryProvider *v, bool, QPainter &paint, QRect) const
{
    if (!m_model || m_model->isEmpty()) return;

    QString unit;
    double min, max;
    bool logarithmic;

    int w = getVerticalScaleWidth(v, false, paint);

    if (m_plotStyle == PlotSegmentation) {

        getValueExtents(min, max, logarithmic, unit);

        if (logarithmic) {
            LogRange::mapRange(min, max);
            LogColourScale().paintVertical(v, this, paint, 0, min, max);
        } else {
            LinearColourScale().paintVertical(v, this, paint, 0, min, max);
        }

    } else {

        getScaleExtents(v, min, max, logarithmic);

        if (logarithmic) {
            LogNumericalScale().paintVertical(v, this, paint, 0, min, max);
        } else {
            LinearNumericalScale().paintVertical(v, this, paint, 0, min, max);
        }
    }
        
    if (getScaleUnits() != "") {
        int mw = w - 5;
        paint.drawText(5,
                       5 + paint.fontMetrics().ascent(),
                       TextAbbrev::abbreviate(getScaleUnits(),
                                              paint.fontMetrics(),
                                              mw));
    }
}

void
RegionLayer::drawStart(LayerGeometryProvider *v, QMouseEvent *e)
{
    if (!m_model) return;

    sv_frame_t frame = v->getFrameForX(e->x());
    if (frame < 0) frame = 0;
    frame = frame / m_model->getResolution() * m_model->getResolution();

    double value = getValueForY(v, e->y());

    m_editingPoint = Event(frame, float(value), 0, "");
    m_originalPoint = m_editingPoint;

    if (m_editingCommand) finish(m_editingCommand);
    m_editingCommand = new ChangeEventsCommand(m_model,
                                                    tr("Draw Region"));
    m_editingCommand->add(m_editingPoint);

    recalcSpacing();

    m_editing = true;
}

void
RegionLayer::drawDrag(LayerGeometryProvider *v, QMouseEvent *e)
{
    if (!m_model || !m_editing) return;

    sv_frame_t frame = v->getFrameForX(e->x());
    if (frame < 0) frame = 0;
    frame = frame / m_model->getResolution() * m_model->getResolution();

    double newValue = m_editingPoint.getValue();
    if (m_verticalScale != EqualSpaced) newValue = getValueForY(v, e->y());

    sv_frame_t newFrame = m_editingPoint.getFrame();
    sv_frame_t newDuration = frame - newFrame;
    if (newDuration < 0) {
        newFrame = frame;
        newDuration = -newDuration;
    } else if (newDuration == 0) {
        newDuration = 1;
    }

    m_editingCommand->remove(m_editingPoint);
    m_editingPoint = m_editingPoint
        .withFrame(newFrame)
        .withValue(float(newValue))
        .withDuration(newDuration);
    m_editingCommand->add(m_editingPoint);

    recalcSpacing();
}

void
RegionLayer::drawEnd(LayerGeometryProvider *, QMouseEvent *)
{
    if (!m_model || !m_editing) return;
    finish(m_editingCommand);
    m_editingCommand = nullptr;
    m_editing = false;

    recalcSpacing();
}

void
RegionLayer::eraseStart(LayerGeometryProvider *v, QMouseEvent *e)
{
    if (!m_model) return;

    if (!getPointToDrag(v, e->x(), e->y(), m_editingPoint)) return;

    if (m_editingCommand) {
        finish(m_editingCommand);
        m_editingCommand = nullptr;
    }

    m_editing = true;
    recalcSpacing();
}

void
RegionLayer::eraseDrag(LayerGeometryProvider *, QMouseEvent *)
{
}

void
RegionLayer::eraseEnd(LayerGeometryProvider *v, QMouseEvent *e)
{
    if (!m_model || !m_editing) return;

    m_editing = false;

    Event p(0);
    if (!getPointToDrag(v, e->x(), e->y(), p)) return;
    if (p.getFrame() != m_editingPoint.getFrame() ||
        p.getValue() != m_editingPoint.getValue()) return;

    m_editingCommand = new ChangeEventsCommand
        (m_model, tr("Erase Region"));

    m_editingCommand->remove(m_editingPoint);

    finish(m_editingCommand);
    m_editingCommand = nullptr;
    m_editing = false;
    recalcSpacing();
}

void
RegionLayer::editStart(LayerGeometryProvider *v, QMouseEvent *e)
{
    if (!m_model) return;

    if (!getPointToDrag(v, e->x(), e->y(), m_editingPoint)) {
        return;
    }

    m_dragPointX = v->getXForFrame(m_editingPoint.getFrame());
    m_dragPointY = getYForValue(v, m_editingPoint.getValue());

    m_originalPoint = m_editingPoint;

    if (m_editingCommand) {
        finish(m_editingCommand);
        m_editingCommand = nullptr;
    }

    m_editing = true;
    m_dragStartX = e->x();
    m_dragStartY = e->y();
    recalcSpacing();
}

void
RegionLayer::editDrag(LayerGeometryProvider *v, QMouseEvent *e)
{
    if (!m_model || !m_editing) return;

    int xdist = e->x() - m_dragStartX;
    int ydist = e->y() - m_dragStartY;
    int newx = m_dragPointX + xdist;
    int newy = m_dragPointY + ydist;

    sv_frame_t frame = v->getFrameForX(newx);
    if (frame < 0) frame = 0;
    frame = frame / m_model->getResolution() * m_model->getResolution();

    // Do not bisect between two values, if one of those values is
    // that of the point we're actually moving ...
    int avoid = m_spacingMap[m_editingPoint.getValue()];

    // ... unless there are other points with the same value
    if (m_distributionMap[m_editingPoint.getValue()] > 1) avoid = -1;

    double value = getValueForY(v, newy, avoid);

    if (!m_editingCommand) {
        m_editingCommand = new ChangeEventsCommand(m_model,
                                                      tr("Drag Region"));
    }

    m_editingCommand->remove(m_editingPoint);
    m_editingPoint = m_editingPoint
        .withFrame(frame)
        .withValue(float(value));
    m_editingCommand->add(m_editingPoint);
    recalcSpacing();
}

void
RegionLayer::editEnd(LayerGeometryProvider *, QMouseEvent *)
{
    if (!m_model || !m_editing) return;

    if (m_editingCommand) {

        QString newName = m_editingCommand->getName();

        if (m_editingPoint.getFrame() != m_originalPoint.getFrame()) {
            if (m_editingPoint.getValue() != m_originalPoint.getValue()) {
                newName = tr("Edit Region");
            } else {
                newName = tr("Relocate Region");
            }
        } else {
            newName = tr("Change Point Value");
        }

        m_editingCommand->setName(newName);
        finish(m_editingCommand);
    }

    m_editingCommand = nullptr;
    m_editing = false;
    recalcSpacing();
}

bool
RegionLayer::editOpen(LayerGeometryProvider *v, QMouseEvent *e)
{
    if (!m_model) return false;

    Event region(0);
    if (!getPointToDrag(v, e->x(), e->y(), region)) return false;

    ItemEditDialog *dialog = new ItemEditDialog
        (m_model->getSampleRate(),
         ItemEditDialog::ShowTime |
         ItemEditDialog::ShowDuration |
         ItemEditDialog::ShowValue |
         ItemEditDialog::ShowText,
         getScaleUnits());

    dialog->setFrameTime(region.getFrame());
    dialog->setValue(region.getValue());
    dialog->setFrameDuration(region.getDuration());
    dialog->setText(region.getLabel());

    if (dialog->exec() == QDialog::Accepted) {

        Event newRegion = region
            .withFrame(dialog->getFrameTime())
            .withValue(dialog->getValue())
            .withDuration(dialog->getFrameDuration())
            .withLabel(dialog->getText());
        
        ChangeEventsCommand *command = new ChangeEventsCommand
            (m_model, tr("Edit Region"));
        command->remove(region);
        command->add(newRegion);
        finish(command);
    }

    delete dialog;
    recalcSpacing();
    return true;
}

void
RegionLayer::moveSelection(Selection s, sv_frame_t newStartFrame)
{
    if (!m_model) return;

    ChangeEventsCommand *command =
        new ChangeEventsCommand(m_model, tr("Drag Selection"));

    EventVector points =
        m_model->getEventsStartingWithin(s.getStartFrame(), s.getDuration());

    for (EventVector::iterator i = points.begin();
         i != points.end(); ++i) {

        Event newPoint = (*i)
            .withFrame(i->getFrame() + newStartFrame - s.getStartFrame());
        command->remove(*i);
        command->add(newPoint);
    }

    finish(command);
    recalcSpacing();
}

void
RegionLayer::resizeSelection(Selection s, Selection newSize)
{
    if (!m_model || !s.getDuration()) return;

    ChangeEventsCommand *command =
        new ChangeEventsCommand(m_model, tr("Resize Selection"));

    EventVector points =
        m_model->getEventsStartingWithin(s.getStartFrame(), s.getDuration());

    double ratio = double(newSize.getDuration()) / double(s.getDuration());
    double oldStart = double(s.getStartFrame());
    double newStart = double(newSize.getStartFrame());
    
    for (Event p: points) {

        double newFrame = (double(p.getFrame()) - oldStart) * ratio + newStart;
        double newDuration = double(p.getDuration()) * ratio;

        Event newPoint = p
            .withFrame(lrint(newFrame))
            .withDuration(lrint(newDuration));
        command->remove(p);
        command->add(newPoint);
    }

    finish(command);
    recalcSpacing();
}

void
RegionLayer::deleteSelection(Selection s)
{
    if (!m_model) return;

    ChangeEventsCommand *command =
        new ChangeEventsCommand(m_model, tr("Delete Selected Points"));

    EventVector points =
        m_model->getEventsStartingWithin(s.getStartFrame(), s.getDuration());

    for (EventVector::iterator i = points.begin();
         i != points.end(); ++i) {

        if (s.contains(i->getFrame())) {
            command->remove(*i);
        }
    }

    finish(command);
    recalcSpacing();
}    

void
RegionLayer::copy(LayerGeometryProvider *v, Selection s, Clipboard &to)
{
    if (!m_model) return;

    EventVector points =
        m_model->getEventsStartingWithin(s.getStartFrame(), s.getDuration());

    for (Event p: points) {
        to.addPoint(p.withReferenceFrame(alignToReference(v, p.getFrame())));
    }
}

bool
RegionLayer::paste(LayerGeometryProvider *v, const Clipboard &from, sv_frame_t /* frameOffset */, bool /* interactive */)
{
    if (!m_model) return false;

    const EventVector &points = from.getPoints();

    bool realign = false;

    if (clipboardHasDifferentAlignment(v, from)) {

        QMessageBox::StandardButton button =
            QMessageBox::question(v->getView(), tr("Re-align pasted items?"),
                                  tr("The items you are pasting came from a layer with different source material from this one.  Do you want to re-align them in time, to match the source material for this layer?"),
                                  QMessageBox::Yes | QMessageBox::No | QMessageBox::Cancel,
                                  QMessageBox::Yes);

        if (button == QMessageBox::Cancel) {
            return false;
        }

        if (button == QMessageBox::Yes) {
            realign = true;
        }
    }

    ChangeEventsCommand *command =
        new ChangeEventsCommand(m_model, tr("Paste"));

    for (EventVector::const_iterator i = points.begin();
         i != points.end(); ++i) {
        
        sv_frame_t frame = 0;

        if (!realign) {
            
            frame = i->getFrame();

        } else {

            if (i->hasReferenceFrame()) {
                frame = i->getReferenceFrame();
                frame = alignFromReference(v, frame);
            } else {
                frame = i->getFrame();
            }
        }

        Event p = *i;
        Event newPoint = p;
        if (!p.hasValue()) {
            newPoint = newPoint.withValue((m_model->getValueMinimum() +
                                           m_model->getValueMaximum()) / 2);
        }
        if (!p.hasDuration()) {
            sv_frame_t nextFrame = frame;
            EventVector::const_iterator j = i;
            for (; j != points.end(); ++j) {
                if (j != i) break;
            }
            if (j != points.end()) {
                nextFrame = j->getFrame();
            }
            if (nextFrame == frame) {
                newPoint = newPoint.withDuration(m_model->getResolution());
            } else {
                newPoint = newPoint.withDuration(nextFrame - frame);
            }
        }
        
        command->add(newPoint);
    }

    finish(command);
    recalcSpacing();
    return true;
}

void
RegionLayer::toXml(QTextStream &stream,
                 QString indent, QString extraAttributes) const
{
    QString s;

    s += QString("verticalScale=\"%1\" "
                 "plotStyle=\"%2\" ")
        .arg(m_verticalScale)
        .arg(m_plotStyle);

    // New-style colour map attribute, by string id rather than by
    // number

    s += QString("fillColourMap=\"%1\" ")
        .arg(ColourMapper::getColourMapId(m_colourMap));
    
    // Old-style colour map attribute

    s += QString("colourMap=\"%1\" ")
        .arg(ColourMapper::getBackwardCompatibilityColourMap(m_colourMap));
    
    SingleColourLayer::toXml(stream, indent, extraAttributes + " " + s);
}

void
RegionLayer::setProperties(const QXmlAttributes &attributes)
{
    SingleColourLayer::setProperties(attributes);

    bool ok;
    VerticalScale scale = (VerticalScale)
        attributes.value("verticalScale").toInt(&ok);
    if (ok) setVerticalScale(scale);
    PlotStyle style = (PlotStyle)
        attributes.value("plotStyle").toInt(&ok);
    if (ok) setPlotStyle(style);
    
    QString colourMapId = attributes.value("fillColourMap");
    int colourMap = ColourMapper::getColourMapById(colourMapId);
    if (colourMap >= 0) {
        setFillColourMap(colourMap);
    } else {
        colourMap = attributes.value("colourMap").toInt(&ok);
        if (ok && colourMap < ColourMapper::getColourMapCount()) {
            setFillColourMap(colourMap);
        }
    }
}