view layer/TimeValueLayer.cpp @ 1160:a429b2acb45d 3.0-integration

Make SVDEBUG always write to a log file -- formerly this was disabled in NDEBUG builds. I think there's little use to that, it just means that we keep adding more cerr debug output because we aren't getting the log we need. And SVDEBUG logging is not usually used in tight loops, I don't think the performance overhead is too serious.

Also update the About box.

/* -*- 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 Chris Cannam.
    
    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 "TimeValueLayer.h"

#include "data/model/Model.h"
#include "base/RealTime.h"
#include "base/Profiler.h"
#include "base/LogRange.h"
#include "base/RangeMapper.h"
#include "base/Pitch.h"
#include "view/View.h"

#include "data/model/SparseTimeValueModel.h"
#include "data/model/Labeller.h"

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

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

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

#include <iostream>
#include <cmath>

//#define DEBUG_TIME_VALUE_LAYER 1

TimeValueLayer::TimeValueLayer() :
    SingleColourLayer(),
    m_model(0),
    m_editing(false),
    m_originalPoint(0, 0.0, tr("New Point")),
    m_editingPoint(0, 0.0, tr("New Point")),
    m_editingCommand(0),
    m_colourMap(0),
    m_plotStyle(PlotConnectedPoints),
    m_verticalScale(AutoAlignScale),
    m_drawSegmentDivisions(true),
    m_derivative(false),
    m_scaleMinimum(0),
    m_scaleMaximum(0)
{
    
}

void
TimeValueLayer::setModel(SparseTimeValueModel *model)
{
    if (m_model == model) return;
    m_model = model;

    connectSignals(m_model);

    m_scaleMinimum = 0;
    m_scaleMaximum = 0;

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

#ifdef DEBUG_TIME_VALUE_LAYER
    cerr << "TimeValueLayer::setModel(" << model << ")" << endl;
#endif

    emit modelReplaced();
}

Layer::PropertyList
TimeValueLayer::getProperties() const
{
    PropertyList list = SingleColourLayer::getProperties();
    list.push_back("Plot Type");
    list.push_back("Vertical Scale");
    list.push_back("Scale Units");
    list.push_back("Draw Segment Division Lines");
    list.push_back("Show Derivative");
    return list;
}

QString
TimeValueLayer::getPropertyLabel(const PropertyName &name) const
{
    if (name == "Plot Type") return tr("Plot Type");
    if (name == "Vertical Scale") return tr("Vertical Scale");
    if (name == "Scale Units") return tr("Scale Units");
    if (name == "Draw Segment Division Lines") return tr("Draw Segment Division Lines");
    if (name == "Show Derivative") return tr("Show Derivative");
    return SingleColourLayer::getPropertyLabel(name);
}

QString
TimeValueLayer::getPropertyIconName(const PropertyName &name) const
{
    if (name == "Draw Segment Division Lines") return "lines";
    if (name == "Show Derivative") return "derivative";
    return "";
}

Layer::PropertyType
TimeValueLayer::getPropertyType(const PropertyName &name) const
{
    if (name == "Plot Type") return ValueProperty;
    if (name == "Vertical Scale") return ValueProperty;
    if (name == "Scale Units") return UnitsProperty;
    if (name == "Colour" && m_plotStyle == PlotSegmentation) return ValueProperty;
    if (name == "Draw Segment Division Lines") return ToggleProperty;
    if (name == "Show Derivative") return ToggleProperty;
    return SingleColourLayer::getPropertyType(name);
}

QString
TimeValueLayer::getPropertyGroupName(const PropertyName &name) const
{
    if (name == "Vertical Scale" || name == "Scale Units") {
        return tr("Scale");
    }
    if (name == "Plot Type" || name == "Draw Segment Division Lines" ||
        name == "Show Derivative") {
        return tr("Plot Type");
    }
    return SingleColourLayer::getPropertyGroupName(name);
}

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

int
TimeValueLayer::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 = 6;
        if (deflt) *deflt = int(PlotConnectedPoints);
	
	val = int(m_plotStyle);

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

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

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

    } else if (name == "Draw Segment Division Lines") {

        if (min) *min = 0;
        if (max) *max = 0;
        if (deflt) *deflt = 1;
        val = (m_drawSegmentDivisions ? 1.0 : 0.0);

    } else if (name == "Show Derivative") {

        if (min) *min = 0;
        if (max) *max = 0;
        if (deflt) *deflt = 0;
        val = (m_derivative ? 1.0 : 0.0);

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

    return val;
}

QString
TimeValueLayer::getPropertyValueLabel(const PropertyName &name,
				    int value) const
{
    if (name == "Colour" && m_plotStyle == PlotSegmentation) {
        return ColourMapper::getColourMapName(value);
    } else if (name == "Plot Type") {
	switch (value) {
	default:
	case 0: return tr("Points");
	case 1: return tr("Stems");
	case 2: return tr("Connected Points");
	case 3: return tr("Lines");
	case 4: return tr("Curve");
	case 5: return tr("Segmentation");
	case 6: return tr("Discrete Curves");
	}
    } else if (name == "Vertical Scale") {
	switch (value) {
	default:
	case 0: return tr("Auto-Align");
	case 1: return tr("Linear");
	case 2: return tr("Log");
	case 3: return tr("+/-1");
	}
    }
    return SingleColourLayer::getPropertyValueLabel(name, value);
}

void
TimeValueLayer::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 if (name == "Draw Segment Division Lines") {
        setDrawSegmentDivisions(value > 0.5);
    } else if (name == "Show Derivative") {
        setShowDerivative(value > 0.5);
    } else {
        SingleColourLayer::setProperty(name, value);
    }
}

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

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

void
TimeValueLayer::setDrawSegmentDivisions(bool draw)
{
    if (m_drawSegmentDivisions == draw) return;
    m_drawSegmentDivisions = draw;
    emit layerParametersChanged();
}

void
TimeValueLayer::setShowDerivative(bool show)
{
    if (m_derivative == show) return;
    m_derivative = show;
    emit layerParametersChanged();
}

bool
TimeValueLayer::isLayerScrollable(const LayerGeometryProvider *v) const
{
    // We don't illuminate sections in the line or curve modes, so
    // they're always scrollable

    if (m_plotStyle == PlotLines ||
	m_plotStyle == PlotCurve ||
        m_plotStyle == PlotDiscreteCurves) return true;

    QPoint discard;
    return !v->shouldIlluminateLocalFeatures(this, discard);
}

bool
TimeValueLayer::getValueExtents(double &min, double &max,
                                bool &logarithmic, QString &unit) const
{
    if (!m_model) return false;

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

    logarithmic = (m_verticalScale == LogScale);

    unit = getScaleUnits();

    if (m_derivative) {
        max = std::max(fabs(min), fabs(max));
        min = -max;
    }

#ifdef DEBUG_TIME_VALUE_LAYER
    cerr << "TimeValueLayer::getValueExtents: min = " << min << ", max = " << max << endl;
#endif

    if (!shouldAutoAlign() && !logarithmic && !m_derivative) {

        if (max == min) {
            max = max + 0.5;
            min = min - 0.5;
        } else {
            double margin = (max - min) / 10.0;
            max = max + margin;
            min = min - margin;
        }

#ifdef DEBUG_TIME_VALUE_LAYER
        cerr << "TimeValueLayer::getValueExtents: min = " << min << ", max = " << max << " (after adjustment)" << endl;
#endif
    }

    return true;
}

bool
TimeValueLayer::getDisplayExtents(double &min, double &max) const
{
    if (!m_model || shouldAutoAlign()) return false;

    if (m_scaleMinimum == m_scaleMaximum) {
        bool log;
        QString unit;
        getValueExtents(min, max, log, unit);
    } else {
        min = m_scaleMinimum;
        max = m_scaleMaximum;
    }

    if (m_derivative) {
        max = std::max(fabs(min), fabs(max));
        min = -max;
    }

#ifdef DEBUG_TIME_VALUE_LAYER
    cerr << "TimeValueLayer::getDisplayExtents: min = " << min << ", max = " << max << endl;
#endif

    return true;
}

bool
TimeValueLayer::setDisplayExtents(double min, double max)
{
    if (!m_model) return false;

    if (min == max) {
        if (min == 0.f) {
            max = 1.f;
        } else {
            max = min * 1.0001;
        }
    }

    m_scaleMinimum = min;
    m_scaleMaximum = max;

#ifdef DEBUG_TIME_VALUE_LAYER
    cerr << "TimeValueLayer::setDisplayExtents: min = " << min << ", max = " << max << endl;
#endif
    
    emit layerParametersChanged();
    return true;
}

int
TimeValueLayer::getVerticalZoomSteps(int &defaultStep) const
{
    if (shouldAutoAlign()) return 0;
    if (!m_model) return 0;

    defaultStep = 0;
    return 100;
}

int
TimeValueLayer::getCurrentVerticalZoomStep() const
{
    if (shouldAutoAlign()) return 0;
    if (!m_model) return 0;

    RangeMapper *mapper = getNewVerticalZoomRangeMapper();
    if (!mapper) return 0;

    double dmin, dmax;
    getDisplayExtents(dmin, dmax);

    int nr = mapper->getPositionForValue(dmax - dmin);

#ifdef DEBUG_TIME_VALUE_LAYER
    cerr << "TimeValueLayer::getCurrentVerticalZoomStep: dmin = " << dmin << ", dmax = " << dmax << ", nr = " << nr << endl;
#endif

    delete mapper;

    return 100 - nr;
}

void
TimeValueLayer::setVerticalZoomStep(int step)
{
    if (shouldAutoAlign()) return;
    if (!m_model) return;

    RangeMapper *mapper = getNewVerticalZoomRangeMapper();
    if (!mapper) return;
    
    double min, max;
    bool logarithmic;
    QString unit;
    getValueExtents(min, max, logarithmic, unit);
    
    double dmin, dmax;
    getDisplayExtents(dmin, dmax);

    double newdist = mapper->getValueForPosition(100 - step);

    double newmin, newmax;

    if (logarithmic) {

        // see SpectrogramLayer::setVerticalZoomStep

        newmax = (newdist + sqrt(newdist*newdist + 4*dmin*dmax)) / 2;
        newmin = newmax - newdist;

#ifdef DEBUG_TIME_VALUE_LAYER
        cerr << "newmin = " << newmin << ", newmax = " << newmax << endl;
#endif

    } else {
        double dmid = (dmax + dmin) / 2;
        newmin = dmid - newdist / 2;
        newmax = dmid + newdist / 2;
    }

    if (newmin < min) {
        newmax += (min - newmin);
        newmin = min;
    }
    if (newmax > max) {
        newmax = max;
    }
    
#ifdef DEBUG_TIME_VALUE_LAYER
    cerr << "TimeValueLayer::setVerticalZoomStep: " << step << ": " << newmin << " -> " << newmax << " (range " << newdist << ")" << endl;
#endif

    setDisplayExtents(newmin, newmax);
}

RangeMapper *
TimeValueLayer::getNewVerticalZoomRangeMapper() const
{
    if (!m_model) return 0;
    
    RangeMapper *mapper;

    double min, max;
    bool logarithmic;
    QString unit;
    getValueExtents(min, max, logarithmic, unit);

    if (min == max) return 0;
    
    if (logarithmic) {
        mapper = new LogRangeMapper(0, 100, min, max, unit);
    } else {
        mapper = new LinearRangeMapper(0, 100, min, max, unit);
    }

    return mapper;
}

SparseTimeValueModel::PointList
TimeValueLayer::getLocalPoints(LayerGeometryProvider *v, int x) const
{
    if (!m_model) return SparseTimeValueModel::PointList();

    sv_frame_t frame = v->getFrameForX(x);

    SparseTimeValueModel::PointList onPoints =
	m_model->getPoints(frame);

    if (!onPoints.empty()) {
	return onPoints;
    }

    SparseTimeValueModel::PointList prevPoints =
	m_model->getPreviousPoints(frame);
    SparseTimeValueModel::PointList nextPoints =
	m_model->getNextPoints(frame);

    SparseTimeValueModel::PointList usePoints = prevPoints;

    if (prevPoints.empty()) {
	usePoints = nextPoints;
    } else if (nextPoints.empty()) {
        // stick with prevPoints
    } else if (prevPoints.begin()->frame < v->getStartFrame() &&
	       !(nextPoints.begin()->frame > v->getEndFrame())) {
	usePoints = nextPoints;
    } else if (nextPoints.begin()->frame - frame <
	       frame - prevPoints.begin()->frame) {
	usePoints = nextPoints;
    }

    if (!usePoints.empty()) {
	int fuzz = 2;
	int px = v->getXForFrame(usePoints.begin()->frame);
	if ((px > x && px - x > fuzz) ||
	    (px < x && x - px > fuzz + 3)) {
	    usePoints.clear();
	}
    }

    return usePoints;
}

QString
TimeValueLayer::getLabelPreceding(sv_frame_t frame) const
{
    if (!m_model) return "";
    SparseTimeValueModel::PointList points = m_model->getPreviousPoints(frame);
    for (SparseTimeValueModel::PointList::const_iterator i = points.begin();
         i != points.end(); ++i) {
        if (i->label != "") return i->label;
    }
    return "";
}

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

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

    SparseTimeValueModel::PointList points = getLocalPoints(v, x);

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

    sv_frame_t useFrame = points.begin()->frame;

    RealTime rt = RealTime::frame2RealTime(useFrame, m_model->getSampleRate());
    
    QString valueText;
    float value = points.begin()->value;
    QString unit = getScaleUnits();

    if (unit == "Hz") {
        valueText = tr("%1 Hz (%2, %3)")
            .arg(value)
            .arg(Pitch::getPitchLabelForFrequency(value))
            .arg(Pitch::getPitchForFrequency(value));
    } else if (unit != "") {
        valueText = tr("%1 %2").arg(value).arg(unit);
    } else {
        valueText = tr("%1").arg(value);
    }
    
    QString text;

    if (points.begin()->label == "") {
	text = QString(tr("Time:\t%1\nValue:\t%2\nNo label"))
	    .arg(rt.toText(true).c_str())
	    .arg(valueText);
    } else {
	text = QString(tr("Time:\t%1\nValue:\t%2\nLabel:\t%4"))
	    .arg(rt.toText(true).c_str())
	    .arg(valueText)
	    .arg(points.begin()->label);
    }

    pos = QPoint(v->getXForFrame(useFrame),
		 getYForValue(v, points.begin()->value));
    return text;
}

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

    resolution = m_model->getResolution();
    SparseTimeValueModel::PointList points;

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

    points = m_model->getPoints(frame, frame);
    sv_frame_t snapped = frame;
    bool found = false;

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

	if (snap == SnapRight) {

	    if (i->frame > frame) {
		snapped = i->frame;
		found = true;
		break;
	    }

	} else if (snap == SnapLeft) {

	    if (i->frame <= frame) {
		snapped = i->frame;
		found = true; // don't break, as the next may be better
	    } else {
		break;
	    }

	} else { // nearest

	    SparseTimeValueModel::PointList::const_iterator j = i;
	    ++j;

	    if (j == points.end()) {

		snapped = i->frame;
		found = true;
		break;

	    } else if (j->frame >= frame) {

		if (j->frame - frame < frame - i->frame) {
		    snapped = j->frame;
		} else {
		    snapped = i->frame;
		}
		found = true;
		break;
	    }
	}
    }

    frame = snapped;
    return found;
}

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

    resolution = m_model->getResolution();

    const SparseTimeValueModel::PointList &points = m_model->getPoints();
    SparseTimeValueModel::PointList close = m_model->getPoints(frame, frame);

    SparseTimeValueModel::PointList::const_iterator i;

    sv_frame_t matchframe = frame;
    double matchvalue = 0.0;

    for (i = close.begin(); i != close.end(); ++i) {
        if (i->frame > frame) break;
        matchvalue = i->value;
        matchframe = i->frame;
    }

    sv_frame_t snapped = frame;
    bool found = false;
    bool distant = false;
    double epsilon = 0.0001;

    i = close.begin();

    // Scan through the close points first, then the more distant ones
    // if no suitable close one is found. So the while-termination
    // condition here can only happen once i has passed through the
    // whole of the close container and then the whole of the separate
    // points container. The two iterators are totally distinct, but
    // have the same type so we cheekily use the same variable and a
    // single loop for both.

    while (i != points.end()) {

        if (!distant) {
            if (i == close.end()) {
                // switch from the close container to the points container
                i = points.begin();
                distant = true;
            }
        }

	if (snap == SnapRight) {

	    if (i->frame > matchframe &&
                fabs(i->value - matchvalue) < epsilon) {
		snapped = i->frame;
		found = true;
		break;
	    }

	} else if (snap == SnapLeft) {

	    if (i->frame < matchframe) {
                if (fabs(i->value - matchvalue) < epsilon) {
                    snapped = i->frame;
                    found = true; // don't break, as the next may be better
                }
	    } else if (found || distant) {
		break;
	    }

	} else { 
            // no other snap types supported
	}

        ++i;
    }

    frame = snapped;
    return found;
}

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

    if (shouldAutoAlign()) {

        if (!v->getValueExtents(getScaleUnits(), min, max, log)) {
            min = m_model->getValueMinimum();
            max = m_model->getValueMaximum();
        } else if (log) {
            LogRange::mapRange(min, max);
        }

    } else if (m_verticalScale == PlusMinusOneScale) {

        min = -1.0;
        max = 1.0;

    } else {

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

#ifdef DEBUG_TIME_VALUE_LAYER
    cerr << "TimeValueLayer::getScaleExtents: min = " << min << ", max = " << max << endl;
#endif
}

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

    getScaleExtents(v, min, max, logarithmic);

#ifdef DEBUG_TIME_VALUE_LAYER
    cerr << "getYForValue(" << val << "): min " << min << ", max "
              << max << ", log " << logarithmic << endl;
#endif

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

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

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

    getScaleExtents(v, min, max, logarithmic);

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

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

    return val;
}

bool
TimeValueLayer::shouldAutoAlign() const
{
    if (!m_model) return false;
    QString unit = getScaleUnits();
    return (m_verticalScale == AutoAlignScale && unit != "");
}

QColor
TimeValueLayer::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) {
        val = LogRange::map(val);
    }

#ifdef DEBUG_TIME_VALUE_LAYER
    cerr << "TimeValueLayer::getColourForValue: min " << min << ", max "
              << max << ", log " << log << ", value " << val << endl;
#endif

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

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

void
TimeValueLayer::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;

    paint.setRenderHint(QPainter::Antialiasing, false);

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

    int x0 = rect.left(), x1 = rect.right();
    sv_frame_t frame0 = v->getFrameForX(x0);
    sv_frame_t frame1 = v->getFrameForX(x1);
    if (m_derivative) --frame0;

    SparseTimeValueModel::PointList points(m_model->getPoints
					   (frame0, frame1));
    if (points.empty()) return;

    paint.setPen(getBaseQColor());

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

#ifdef DEBUG_TIME_VALUE_LAYER
    cerr << "TimeValueLayer::paint: resolution is "
	      << m_model->getResolution() << " frames" << endl;
#endif

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

    int origin = int(nearbyint(v->getPaintHeight() -
			       (-min * v->getPaintHeight()) / (max - min)));

    QPoint localPos;
    sv_frame_t illuminateFrame = -1;

    if (v->shouldIlluminateLocalFeatures(this, localPos)) {
	SparseTimeValueModel::PointList localPoints =
	    getLocalPoints(v, localPos.x());
#ifdef DEBUG_TIME_VALUE_LAYER
        cerr << "TimeValueLayer: " << localPoints.size() << " local points" << endl;
#endif
	if (!localPoints.empty()) illuminateFrame = localPoints.begin()->frame;
    }

    int w =
	v->getXForFrame(frame0 + m_model->getResolution()) -
	v->getXForFrame(frame0);

    if (m_plotStyle == PlotStems) {
        if (w < 2) w = 2;
    } else {
        if (w < 1) w = 1;
    }

    paint.save();

    QPainterPath path;
    int pointCount = 0;

    int textY = 0;
    if (m_plotStyle == PlotSegmentation) {
        textY = v->getTextLabelHeight(this, paint);
    } else {
        int originY = getYForValue(v, 0.f);
        if (originY > 0 && originY < v->getPaintHeight()) {
            paint.save();
            paint.setPen(getPartialShades(v)[1]);
            paint.drawLine(x0, originY, x1, originY);
            paint.restore();
        }
    }
    
    sv_frame_t prevFrame = 0;

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

        if (m_derivative && i == points.begin()) continue;

	const SparseTimeValueModel::Point &p(*i);

        double value = p.value;
        if (m_derivative) {
            SparseTimeValueModel::PointList::const_iterator j = i;
            --j;
            value -= j->value;
        }

	int x = v->getXForFrame(p.frame);
	int y = getYForValue(v, value);

        bool gap = false;
        if (m_plotStyle == PlotDiscreteCurves) { 
            if (value == 0.0) {
                // Treat zeros as gaps
                continue;
            }
            gap = (p.frame > prevFrame &&
                   (p.frame - prevFrame >= m_model->getResolution() * 2));
        }

        if (m_plotStyle != PlotSegmentation) {
            textY = y - paint.fontMetrics().height()
                      + paint.fontMetrics().ascent() - 1;
            if (textY < paint.fontMetrics().ascent() + 1) {
                textY = paint.fontMetrics().ascent() + 1;
            }
        }

	bool haveNext = false;
        double nvalue = 0.f;
        sv_frame_t nf = v->getModelsEndFrame();
	int nx = v->getXForFrame(nf);
	int ny = y;

	SparseTimeValueModel::PointList::const_iterator j = i;
	++j;

	if (j != points.end()) {
	    const SparseTimeValueModel::Point &q(*j);
            nvalue = q.value;
            if (m_derivative) nvalue -= p.value;
            nf = q.frame;
	    nx = v->getXForFrame(nf);
	    ny = getYForValue(v, nvalue);
	    haveNext = true;
        }

//        cout << "frame = " << p.frame << ", x = " << x << ", haveNext = " << haveNext 
//                  << ", nx = " << nx << endl;

        if (m_plotStyle == PlotDiscreteCurves) {
            paint.setPen(QPen(getBaseQColor(), 3));
            paint.setBrush(Qt::NoBrush);
        } else if (m_plotStyle == PlotSegmentation) {
            paint.setPen(getForegroundQColor(v));
            paint.setBrush(getColourForValue(v, value));
	} else if (m_plotStyle == PlotLines ||
		   m_plotStyle == PlotCurve) {
            paint.setPen(getBaseQColor());
	    paint.setBrush(Qt::NoBrush);
	} else {
            paint.setPen(getBaseQColor());
	    paint.setBrush(brushColour);
	}	    

	if (m_plotStyle == PlotStems) {
/*
	    paint.setPen(brushColour);
	    if (y < origin - 1) {
		paint.drawRect(x + w/2, y + 1, 1, origin - y);
	    } else if (y > origin + 1) {
		paint.drawRect(x + w/2, origin, 1, y - origin - 1);
	    }
*/
	    paint.setPen(getBaseQColor());
	    if (y < origin - 1) {
		paint.drawLine(x + w/2, y + 1, x + w/2, origin);
	    } else if (y > origin + 1) {
		paint.drawLine(x + w/2, origin, x + w/2, y - 1);
	    }
	}

        bool illuminate = false;

	if (illuminateFrame == p.frame) {

	    // not equipped to illuminate the right section in line
	    // or curve mode

	    if (m_plotStyle != PlotCurve &&
                m_plotStyle != PlotDiscreteCurves &&
		m_plotStyle != PlotLines) {
                illuminate = true;
            }
        }

	if (m_plotStyle != PlotLines &&
	    m_plotStyle != PlotCurve &&
            m_plotStyle != PlotDiscreteCurves &&
	    m_plotStyle != PlotSegmentation) {
            if (illuminate) {
                paint.save();
		paint.setPen(getForegroundQColor(v));
                paint.setBrush(getForegroundQColor(v));
            }
            if (m_plotStyle != PlotStems ||
                w > 1) {
                paint.drawRect(x, y - 1, w, 2);
            }
            if (illuminate) {
                paint.restore();
            }
	}

	if (m_plotStyle == PlotConnectedPoints ||
	    m_plotStyle == PlotLines ||
            m_plotStyle == PlotDiscreteCurves ||
	    m_plotStyle == PlotCurve) {

	    if (haveNext) {

		if (m_plotStyle == PlotConnectedPoints) {
		    
                    paint.save();
		    paint.setPen(brushColour);
		    paint.drawLine(x + w, y, nx, ny);
                    paint.restore();

		} else if (m_plotStyle == PlotLines) {
                    
                    if (pointCount == 0) {
                        path.moveTo(x + w/2, y);
                    }

//		    paint.drawLine(x + w/2, y, nx + w/2, ny);
                    path.lineTo(nx + w/2, ny);

		} else {

		    double x0 = x + double(w)/2;
		    double x1 = nx + double(w)/2;
		    
		    double y0 = y;
		    double y1 = ny;

                    if (m_plotStyle == PlotDiscreteCurves) {
                        bool nextGap =
                            (nvalue == 0.0) ||
                            (nf - p.frame >= m_model->getResolution() * 2);
                        if (nextGap) {
                            x1 = x0;
                            y1 = y0;
                        }
                    }

		    if (pointCount == 0 || gap) {
			path.moveTo((x0 + x1) / 2, (y0 + y1) / 2);
		    }

		    if (nx - x > 5) {
			path.cubicTo(x0, y0,
				     x0, y0,
				     (x0 + x1) / 2, (y0 + y1) / 2);

			// // or
			// path.quadTo(x0, y0, (x0 + x1) / 2, (y0 + y1) / 2);

		    } else {
                        path.lineTo(x0, y0);
			path.lineTo((x0 + x1) / 2, (y0 + y1) / 2);
		    }
		}
	    }
	}

	if (m_plotStyle == PlotSegmentation) {

#ifdef DEBUG_TIME_VALUE_LAYER
            cerr << "drawing rect" << endl;
#endif
	    
	    if (nx <= x) continue;

            paint.setPen(QPen(getForegroundQColor(v), 2));

            if (!illuminate) {
                if (!m_drawSegmentDivisions ||
                    nx < x + 5 ||
                    x >= v->getPaintWidth() - 1) {
                    paint.setPen(Qt::NoPen);
                }
	    }

	    paint.drawRect(x, -1, nx - x, v->getPaintHeight() + 1);
	}

        if (v->shouldShowFeatureLabels()) {

            QString label = p.label;
            bool italic = false;

            if (label == "" &&
                (m_plotStyle == PlotPoints ||
                 m_plotStyle == PlotSegmentation ||
                 m_plotStyle == PlotConnectedPoints)) {
                char lc[20];
                snprintf(lc, 20, "%.3g", p.value);
                label = lc;
                italic = true;
            }

            if (label != "") {
                // Quick test for 20px before we do the slower test using metrics
                bool haveRoom = (nx > x + 20);
                haveRoom = (haveRoom &&
                            (nx > x + 6 + paint.fontMetrics().width(label)));
                if (haveRoom ||
                    (!haveNext &&
                     (pointCount == 0 || !italic))) {
                    PaintAssistant::drawVisibleText(v, paint, x + 5, textY, label,
                                       italic ?
                                       PaintAssistant::OutlinedItalicText :
                                       PaintAssistant::OutlinedText);
                }
            }
        }

        prevFrame = p.frame;
        ++pointCount;
    }

    if (m_plotStyle == PlotDiscreteCurves) {
        paint.setRenderHint(QPainter::Antialiasing, true);
	paint.drawPath(path);
    } else if ((m_plotStyle == PlotCurve || m_plotStyle == PlotLines)
               && !path.isEmpty()) {
	paint.setRenderHint(QPainter::Antialiasing, pointCount <= v->getPaintWidth());
	paint.drawPath(path);
    }

    paint.restore();

    // looks like save/restore doesn't deal with this:
    paint.setRenderHint(QPainter::Antialiasing, false);
}

int
TimeValueLayer::getVerticalScaleWidth(LayerGeometryProvider *v, bool, QPainter &paint) const
{
    if (!m_model || shouldAutoAlign()) {
        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) + 10; // for piano
        } else {
            return LinearNumericalScale().getWidth(v, paint);
        }
    }
}

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

    QString unit;
    double min, max;
    bool logarithmic;

    int w = getVerticalScaleWidth(v, false, paint);
    int h = v->getPaintHeight();

    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 (logarithmic && (getScaleUnits() == "Hz")) {
            PianoScale().paintPianoVertical
                (v, paint, QRect(w - 10, 0, 10, h), 
                 LogRange::unmap(min), 
                 LogRange::unmap(max));
            paint.drawLine(w, 0, w, h);
        }
    }
        
    if (getScaleUnits() != "") {
        int mw = w - 5;
        paint.drawText(5,
                       5 + paint.fontMetrics().ascent(),
                       TextAbbrev::abbreviate(getScaleUnits(),
                                              paint.fontMetrics(),
                                              mw));
    }
}

void
TimeValueLayer::drawStart(LayerGeometryProvider *v, QMouseEvent *e)
{
#ifdef DEBUG_TIME_VALUE_LAYER
    cerr << "TimeValueLayer::drawStart(" << e->x() << "," << e->y() << ")" << endl;
#endif

    if (!m_model) return;

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

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

    bool havePoint = false;

    SparseTimeValueModel::PointList points = getLocalPoints(v, e->x());
    if (!points.empty()) {
        for (SparseTimeValueModel::PointList::iterator i = points.begin();
             i != points.end(); ++i) {
            if (((i->frame / resolution) * resolution) != frame) {
#ifdef DEBUG_TIME_VALUE_LAYER
                cerr << "ignoring out-of-range frame at " << i->frame << endl;
#endif
                continue;
            }
            m_editingPoint = *i;
            havePoint = true;
        }
    }

    if (!havePoint) {
        m_editingPoint = SparseTimeValueModel::Point
            (frame, float(value), tr("New Point"));
    }

    m_originalPoint = m_editingPoint;

    if (m_editingCommand) finish(m_editingCommand);
    m_editingCommand = new SparseTimeValueModel::EditCommand(m_model,
							     tr("Draw Point"));
    if (!havePoint) {
        m_editingCommand->addPoint(m_editingPoint);
    }

    m_editing = true;
}

void
TimeValueLayer::drawDrag(LayerGeometryProvider *v, QMouseEvent *e)
{
#ifdef DEBUG_TIME_VALUE_LAYER
    cerr << "TimeValueLayer::drawDrag(" << e->x() << "," << e->y() << ")" << endl;
#endif

    if (!m_model || !m_editing) return;

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

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

    SparseTimeValueModel::PointList points = getLocalPoints(v, e->x());

#ifdef DEBUG_TIME_VALUE_LAYER
    cerr << points.size() << " points" << endl;
#endif

    bool havePoint = false;

    if (!points.empty()) {
        for (SparseTimeValueModel::PointList::iterator i = points.begin();
             i != points.end(); ++i) {
            if (i->frame == m_editingPoint.frame &&
                i->value == m_editingPoint.value) {
#ifdef DEBUG_TIME_VALUE_LAYER
                cerr << "ignoring current editing point at " << i->frame << ", " << i->value << endl;
#endif
                continue;
            }
            if (((i->frame / resolution) * resolution) != frame) {
#ifdef DEBUG_TIME_VALUE_LAYER
                cerr << "ignoring out-of-range frame at " << i->frame << endl;
#endif
                continue;
            }
#ifdef DEBUG_TIME_VALUE_LAYER
            cerr << "adjusting to new point at " << i->frame << ", " << i->value << endl;
#endif
            m_editingPoint = *i;
            m_originalPoint = m_editingPoint;
            m_editingCommand->deletePoint(m_editingPoint);
            havePoint = true;
        }
    }

    if (!havePoint) {
        if (frame == m_editingPoint.frame) {
            m_editingCommand->deletePoint(m_editingPoint);
        }
    }

//    m_editingCommand->deletePoint(m_editingPoint);
    m_editingPoint.frame = frame;
    m_editingPoint.value = float(value);
    m_editingCommand->addPoint(m_editingPoint);
}

void
TimeValueLayer::drawEnd(LayerGeometryProvider *, QMouseEvent *)
{
#ifdef DEBUG_TIME_VALUE_LAYER
    cerr << "TimeValueLayer::drawEnd" << endl;
#endif
    if (!m_model || !m_editing) return;
    finish(m_editingCommand);
    m_editingCommand = 0;
    m_editing = false;
}

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

    SparseTimeValueModel::PointList points = getLocalPoints(v, e->x());
    if (points.empty()) return;

    m_editingPoint = *points.begin();

    if (m_editingCommand) {
	finish(m_editingCommand);
	m_editingCommand = 0;
    }

    m_editing = true;
}

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

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

    m_editing = false;

    SparseTimeValueModel::PointList points = getLocalPoints(v, e->x());
    if (points.empty()) return;
    if (points.begin()->frame != m_editingPoint.frame ||
        points.begin()->value != m_editingPoint.value) return;

    m_editingCommand = new SparseTimeValueModel::EditCommand
        (m_model, tr("Erase Point"));

    m_editingCommand->deletePoint(m_editingPoint);

    finish(m_editingCommand);
    m_editingCommand = 0;
    m_editing = false;
}

void
TimeValueLayer::editStart(LayerGeometryProvider *v, QMouseEvent *e)
{
#ifdef DEBUG_TIME_VALUE_LAYER
    cerr << "TimeValueLayer::editStart(" << e->x() << "," << e->y() << ")" << endl;
#endif

    if (!m_model) return;

    SparseTimeValueModel::PointList points = getLocalPoints(v, e->x());
    if (points.empty()) return;

    m_editingPoint = *points.begin();
    m_originalPoint = m_editingPoint;

    if (m_editingCommand) {
	finish(m_editingCommand);
	m_editingCommand = 0;
    }

    m_editing = true;
}

void
TimeValueLayer::editDrag(LayerGeometryProvider *v, QMouseEvent *e)
{
#ifdef DEBUG_TIME_VALUE_LAYER
    cerr << "TimeValueLayer::editDrag(" << e->x() << "," << e->y() << ")" << endl;
#endif

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

    if (!m_editingCommand) {
	m_editingCommand = new SparseTimeValueModel::EditCommand(m_model,
								 tr("Drag Point"));
    }

    m_editingCommand->deletePoint(m_editingPoint);
    m_editingPoint.frame = frame;
    m_editingPoint.value = float(value);
    m_editingCommand->addPoint(m_editingPoint);
}

void
TimeValueLayer::editEnd(LayerGeometryProvider *, QMouseEvent *)
{
#ifdef DEBUG_TIME_VALUE_LAYER
    cerr << "TimeValueLayer::editEnd" << endl;
#endif
    if (!m_model || !m_editing) return;

    if (m_editingCommand) {

	QString newName = m_editingCommand->getName();

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

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

    m_editingCommand = 0;
    m_editing = false;
}

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

    SparseTimeValueModel::PointList points = getLocalPoints(v, e->x());
    if (points.empty()) return false;

    SparseTimeValueModel::Point point = *points.begin();

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

    dialog->setFrameTime(point.frame);
    dialog->setValue(point.value);
    dialog->setText(point.label);

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

        SparseTimeValueModel::Point newPoint = point;
        newPoint.frame = dialog->getFrameTime();
        newPoint.value = dialog->getValue();
        newPoint.label = dialog->getText();
        
        SparseTimeValueModel::EditCommand *command =
            new SparseTimeValueModel::EditCommand(m_model, tr("Edit Point"));
        command->deletePoint(point);
        command->addPoint(newPoint);
        finish(command);
    }

    delete dialog;
    return true;
}

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

    SparseTimeValueModel::EditCommand *command =
	new SparseTimeValueModel::EditCommand(m_model,
					      tr("Drag Selection"));

    SparseTimeValueModel::PointList points =
	m_model->getPoints(s.getStartFrame(), s.getEndFrame());

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

	if (s.contains(i->frame)) {
	    SparseTimeValueModel::Point newPoint(*i);
	    newPoint.frame = i->frame + newStartFrame - s.getStartFrame();
	    command->deletePoint(*i);
	    command->addPoint(newPoint);
	}
    }

    finish(command);
}

void
TimeValueLayer::resizeSelection(Selection s, Selection newSize)
{
    if (!m_model) return;

    SparseTimeValueModel::EditCommand *command =
	new SparseTimeValueModel::EditCommand(m_model,
					      tr("Resize Selection"));

    SparseTimeValueModel::PointList points =
	m_model->getPoints(s.getStartFrame(), s.getEndFrame());

    double ratio =
	double(newSize.getEndFrame() - newSize.getStartFrame()) /
	double(s.getEndFrame() - s.getStartFrame());

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

	if (s.contains(i->frame)) {

	    double target = double(i->frame);
	    target = double(newSize.getStartFrame()) +
		target - double(s.getStartFrame()) * ratio;

	    SparseTimeValueModel::Point newPoint(*i);
	    newPoint.frame = lrint(target);
	    command->deletePoint(*i);
	    command->addPoint(newPoint);
	}
    }

    finish(command);
}

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

    SparseTimeValueModel::EditCommand *command =
	new SparseTimeValueModel::EditCommand(m_model,
					      tr("Delete Selected Points"));

    SparseTimeValueModel::PointList points =
	m_model->getPoints(s.getStartFrame(), s.getEndFrame());

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

        if (s.contains(i->frame)) {
            command->deletePoint(*i);
        }
    }

    finish(command);
}    

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

    SparseTimeValueModel::PointList points =
	m_model->getPoints(s.getStartFrame(), s.getEndFrame());

    for (SparseTimeValueModel::PointList::iterator i = points.begin();
	 i != points.end(); ++i) {
	if (s.contains(i->frame)) {
            Clipboard::Point point(i->frame, i->value, i->label);
            point.setReferenceFrame(alignToReference(v, i->frame));
            to.addPoint(point);
        }
    }
}

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

    const Clipboard::PointList &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;
        }
    }

    SparseTimeValueModel::EditCommand *command =
	new SparseTimeValueModel::EditCommand(m_model, tr("Paste"));

    enum ValueAvailability {
        UnknownAvailability,
        NoValues,
        SomeValues,
        AllValues
    };

    Labeller::ValueType generation = Labeller::ValueNone;

    bool haveUsableLabels = false;
    Labeller labeller;
    labeller.setSampleRate(m_model->getSampleRate());

    if (interactive) {

        ValueAvailability availability = UnknownAvailability;

        for (Clipboard::PointList::const_iterator i = points.begin();
             i != points.end(); ++i) {
        
            if (!i->haveFrame()) continue;

            if (availability == UnknownAvailability) {
                if (i->haveValue()) availability = AllValues;
                else availability = NoValues;
                continue;
            }

            if (i->haveValue()) {
                if (availability == NoValues) {
                    availability = SomeValues;
                }
            } else {
                if (availability == AllValues) {
                    availability = SomeValues;
                }
            }

            if (!haveUsableLabels) {
                if (i->haveLabel()) {
                    if (i->getLabel().contains(QRegExp("[0-9]"))) {
                        haveUsableLabels = true;
                    }
                }
            }

            if (availability == SomeValues && haveUsableLabels) break;
        }

        if (availability == NoValues || availability == SomeValues) {
            
            QString text;
            if (availability == NoValues) {
                text = tr("The items you are pasting do not have values.\nWhat values do you want to use for these items?");
            } else {
                text = tr("Some of the items you are pasting do not have values.\nWhat values do you want to use for these items?");
            }

            Labeller::TypeNameMap names = labeller.getTypeNames();

            QStringList options;
            std::vector<Labeller::ValueType> genopts;

            for (Labeller::TypeNameMap::const_iterator i = names.begin();
                 i != names.end(); ++i) {
                if (i->first == Labeller::ValueNone) options << tr("Zero for all items");
                else options << i->second;
                genopts.push_back(i->first);
            }

            static int prevSelection = 0;

            bool ok = false;
            QString selected = ListInputDialog::getItem
                (0, tr("Choose value calculation"),
                 text, options, prevSelection, &ok);

            if (!ok) {
                delete command;
                return false;
            }
            int selection = 0;
            generation = Labeller::ValueNone;

            for (QStringList::const_iterator i = options.begin();
                 i != options.end(); ++i) {
                if (selected == *i) {
                    generation = genopts[selection];
                    break;
                }
                ++selection;
            }
            
            labeller.setType(generation);

            if (generation == Labeller::ValueFromCyclicalCounter ||
                generation == Labeller::ValueFromTwoLevelCounter) {
                int cycleSize = QInputDialog::getInt
                    (0, tr("Select cycle size"),
                     tr("Cycle size:"), 4, 2, 16, 1);
                labeller.setCounterCycleSize(cycleSize);
            }

            prevSelection = selection;
        }
    }

    SparseTimeValueModel::Point prevPoint(0);

    for (Clipboard::PointList::const_iterator i = points.begin();
         i != points.end(); ++i) {
        
        if (!i->haveFrame()) continue;

        sv_frame_t frame = 0;

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

        } else {

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

        SparseTimeValueModel::Point newPoint(frame);
  
        if (i->haveLabel()) {
            newPoint.label = i->getLabel();
        } else if (i->haveValue()) {
            newPoint.label = QString("%1").arg(i->getValue());
        }

        bool usePrev = false;
        SparseTimeValueModel::Point formerPrevPoint = prevPoint;

        if (i->haveValue()) {
            newPoint.value = i->getValue();
        } else {
#ifdef DEBUG_TIME_VALUE_LAYER
            cerr << "Setting value on point at " << newPoint.frame << " from labeller";
            if (i == points.begin()) {
                cerr << ", no prev point" << endl;
            } else {
                cerr << ", prev point is at " << prevPoint.frame << endl;
            }
#endif
            labeller.setValue<SparseTimeValueModel::Point>
                (newPoint, (i == points.begin()) ? 0 : &prevPoint);
#ifdef DEBUG_TIME_VALUE_LAYER
            cerr << "New point value = " << newPoint.value << endl;
#endif
            if (labeller.actingOnPrevPoint() && i != points.begin()) {
                usePrev = true;
            }
        }

        if (usePrev) {
            command->deletePoint(formerPrevPoint);
            command->addPoint(prevPoint);
        }

        prevPoint = newPoint;
        command->addPoint(newPoint);
    }

    finish(command);
    return true;
}

void
TimeValueLayer::toXml(QTextStream &stream,
                      QString indent, QString extraAttributes) const
{
    SingleColourLayer::toXml(stream, indent,
                             extraAttributes +
                             QString(" colourMap=\"%1\" plotStyle=\"%2\" verticalScale=\"%3\" scaleMinimum=\"%4\" scaleMaximum=\"%5\" drawDivisions=\"%6\" derivative=\"%7\" ")
                             .arg(m_colourMap)
                             .arg(m_plotStyle)
                             .arg(m_verticalScale)
                             .arg(m_scaleMinimum)
                             .arg(m_scaleMaximum)
                             .arg(m_drawSegmentDivisions ? "true" : "false")
                             .arg(m_derivative ? "true" : "false"));
}

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

    bool ok, alsoOk;

    int cmap = attributes.value("colourMap").toInt(&ok);
    if (ok) setFillColourMap(cmap);

    PlotStyle style = (PlotStyle)
	attributes.value("plotStyle").toInt(&ok);
    if (ok) setPlotStyle(style);

    VerticalScale scale = (VerticalScale)
	attributes.value("verticalScale").toInt(&ok);
    if (ok) setVerticalScale(scale);

    bool draw = (attributes.value("drawDivisions").trimmed() == "true");
    setDrawSegmentDivisions(draw);

    bool derivative = (attributes.value("derivative").trimmed() == "true");
    setShowDerivative(derivative);

    float min = attributes.value("scaleMinimum").toFloat(&ok);
    float max = attributes.value("scaleMaximum").toFloat(&alsoOk);
#ifdef DEBUG_TIME_VALUE_LAYER
    cerr << "from properties: min = " << min << ", max = " << max << endl;
#endif
    if (ok && alsoOk && min != max) setDisplayExtents(min, max);
}