view data/model/ImageModel.h @ 1196:c7b9c902642f spectrogram-minor-refactor

Fix threshold in spectrogram -- it wasn't working in the last release.
There is a new protocol for this. Formerly the threshold parameter had a
range from -50dB to 0 with the default at -50, and -50 treated internally
as "no threshold". However, there was a hardcoded, hidden internal threshold
for spectrogram colour mapping at -80dB with anything below this being rounded
to zero. Now the threshold parameter has range -81 to -1 with the default
at -80, -81 is treated internally as "no threshold", and there is no hidden
internal threshold. So the default behaviour is the same as before, an
effective -80dB threshold, but it is now possible to change this in both
directions. Sessions reloaded from prior versions may look slightly different
because, if the session says there should be no threshold, there will now
actually be no threshold instead of having the hidden internal one.

Still need to do something in the UI to make it apparent that the -81dB
setting removes the threshold entirely. This is at least no worse than the
previous, also obscured, magic -50dB setting.

/* -*- 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 2006-2007 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.
*/

#ifndef _IMAGE_MODEL_H_
#define _IMAGE_MODEL_H_

#include "SparseModel.h"
#include "base/XmlExportable.h"
#include "base/RealTime.h"

#include <QStringList>

/**
 * Image point type for use in a SparseModel.  This represents an
 * image, identified by filename, at a given time.  The filename can
 * be empty, in which case we instead have a space to put an image in.
 */

struct ImagePoint : public XmlExportable
{
public:
    ImagePoint(sv_frame_t _frame) : frame(_frame) { }
    ImagePoint(sv_frame_t _frame, QString _image, QString _label) :
        frame(_frame), image(_image), label(_label) { }

    int getDimensions() const { return 1; }
    
    sv_frame_t frame;
    QString image;
    QString label;

    QString getLabel() const { return label; }
    
    void toXml(QTextStream &stream,
               QString indent = "",
               QString extraAttributes = "") const
    {
	stream <<
            QString("%1<point frame=\"%2\" image=\"%3\" label=\"%4\" %5/>\n")
	    .arg(indent).arg(frame)
            .arg(encodeEntities(image))
            .arg(encodeEntities(label))
            .arg(extraAttributes);
    }

    QString toDelimitedDataString(QString delimiter, DataExportOptions, sv_samplerate_t sampleRate) const
    {
        QStringList list;
        list << RealTime::frame2RealTime(frame, sampleRate).toString().c_str();
        list << image;
        if (label != "") list << label;
        return list.join(delimiter);
    }

    struct Comparator {
	bool operator()(const ImagePoint &p1,
			const ImagePoint &p2) const {
	    if (p1.frame != p2.frame) return p1.frame < p2.frame;
            if (p1.label != p2.label) return p1.label < p2.label;
	    return p1.image < p2.image;
	}
    };
    
    struct OrderComparator {
	bool operator()(const ImagePoint &p1,
			const ImagePoint &p2) const {
	    return p1.frame < p2.frame;
	}
    };
};


// Make this a class rather than a typedef so it can be predeclared.

class ImageModel : public SparseModel<ImagePoint>
{
    Q_OBJECT

public:
    ImageModel(sv_samplerate_t sampleRate, int resolution, bool notifyOnAdd = true) :
	SparseModel<ImagePoint>(sampleRate, resolution, notifyOnAdd)
    { }

    QString getTypeName() const { return tr("Image"); }

    virtual void toXml(QTextStream &out,
                       QString indent = "",
                       QString extraAttributes = "") const
    {
        SparseModel<ImagePoint>::toXml
	    (out, 
             indent,
	     QString("%1 subtype=\"image\"")
	     .arg(extraAttributes));
    }

    /**
     * Command to change the image for a point.
     */
    class ChangeImageCommand : public Command
    {
    public:
        ChangeImageCommand(ImageModel *model,
                           const ImagePoint &point,
                           QString newImage,
                           QString newLabel) :
	    m_model(model), m_oldPoint(point), m_newPoint(point) {
	    m_newPoint.image = newImage;
            m_newPoint.label = newLabel;
	}

	virtual QString getName() const { return tr("Edit Image"); }

	virtual void execute() { 
	    m_model->deletePoint(m_oldPoint);
	    m_model->addPoint(m_newPoint);
	    std::swap(m_oldPoint, m_newPoint);
	}

	virtual void unexecute() { execute(); }

    private:
	ImageModel *m_model;
	ImagePoint m_oldPoint;
	ImagePoint m_newPoint;
    };

    /**
     * TabularModel methods.  
     */
    
    virtual int getColumnCount() const
    {
        return 4;
    }

    virtual QString getHeading(int column) const
    {
        switch (column) {
        case 0: return tr("Time");
        case 1: return tr("Frame");
        case 2: return tr("Image");
        case 3: return tr("Label");
        default: return tr("Unknown");
        }
    }

    virtual QVariant getData(int row, int column, int role) const
    {
        if (column < 2) {
            return SparseModel<ImagePoint>::getData
                (row, column, role);
        }

        PointListConstIterator i = getPointListIteratorForRow(row);
        if (i == m_points.end()) return QVariant();

        switch (column) {
        case 2: return i->image;
        case 3: return i->label;
        default: return QVariant();
        }
    }

    virtual Command *getSetDataCommand(int row, int column, const QVariant &value, int role)
    {
        if (column < 2) {
            return SparseModel<ImagePoint>::getSetDataCommand
                (row, column, value, role);
        }

        if (role != Qt::EditRole) return 0;
        PointListIterator i = getPointListIteratorForRow(row);
        if (i == m_points.end()) return 0;
        EditCommand *command = new EditCommand(this, tr("Edit Data"));

        Point point(*i);
        command->deletePoint(point);

        switch (column) {
        case 2: point.image = value.toString(); break;
        case 3: point.label = value.toString(); break;
        }

        command->addPoint(point);
        return command->finish();
    }

    virtual bool isColumnTimeValue(int column) const
    {
        return (column < 2); 
    }

    virtual SortType getSortType(int column) const
    {
        if (column > 2) return SortAlphabetical;
        return SortNumeric;
    }
};


#endif