view layer/TimeValueLayer.h @ 1127:9fb8dfd7ce4c 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 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.
*/

#ifndef _TIME_VALUE_LAYER_H_
#define _TIME_VALUE_LAYER_H_

#include "SingleColourLayer.h"
#include "VerticalScaleLayer.h"
#include "ColourScaleLayer.h"

#include "data/model/SparseTimeValueModel.h"

#include <QObject>
#include <QColor>

class View;
class QPainter;

class TimeValueLayer : public SingleColourLayer, 
                       public VerticalScaleLayer, 
                       public ColourScaleLayer
{
    Q_OBJECT

public:
    TimeValueLayer();

    virtual void paint(LayerGeometryProvider *v, QPainter &paint, QRect rect) const;

    virtual int getVerticalScaleWidth(LayerGeometryProvider *v, bool, QPainter &) const;
    virtual void paintVerticalScale(LayerGeometryProvider *v, bool, QPainter &paint, QRect rect) const;

    virtual QString getFeatureDescription(LayerGeometryProvider *v, QPoint &) const;
    virtual QString getLabelPreceding(sv_frame_t) const;

    virtual bool snapToFeatureFrame(LayerGeometryProvider *v, sv_frame_t &frame,
				    int &resolution,
				    SnapType snap) const;
    virtual bool snapToSimilarFeature(LayerGeometryProvider *v, sv_frame_t &frame,
                                      int &resolution,
                                      SnapType snap) const;

    virtual void drawStart(LayerGeometryProvider *v, QMouseEvent *);
    virtual void drawDrag(LayerGeometryProvider *v, QMouseEvent *);
    virtual void drawEnd(LayerGeometryProvider *v, QMouseEvent *);

    virtual void eraseStart(LayerGeometryProvider *v, QMouseEvent *);
    virtual void eraseDrag(LayerGeometryProvider *v, QMouseEvent *);
    virtual void eraseEnd(LayerGeometryProvider *v, QMouseEvent *);

    virtual void editStart(LayerGeometryProvider *v, QMouseEvent *);
    virtual void editDrag(LayerGeometryProvider *v, QMouseEvent *);
    virtual void editEnd(LayerGeometryProvider *v, QMouseEvent *);

    virtual bool editOpen(LayerGeometryProvider *v, QMouseEvent *);

    virtual void moveSelection(Selection s, sv_frame_t newStartFrame);
    virtual void resizeSelection(Selection s, Selection newSize);
    virtual void deleteSelection(Selection s);

    virtual void copy(LayerGeometryProvider *v, Selection s, Clipboard &to);
    virtual bool paste(LayerGeometryProvider *v, const Clipboard &from, sv_frame_t frameOffset,
                       bool interactive);

    virtual const Model *getModel() const { return m_model; }
    void setModel(SparseTimeValueModel *model);

    virtual PropertyList getProperties() const;
    virtual QString getPropertyLabel(const PropertyName &) const;
    virtual QString getPropertyIconName(const PropertyName &) const;
    virtual PropertyType getPropertyType(const PropertyName &) const;
    virtual QString getPropertyGroupName(const PropertyName &) const;
    virtual int getPropertyRangeAndValue(const PropertyName &,
                                         int *min, int *max, int *deflt) const;
    virtual QString getPropertyValueLabel(const PropertyName &,
					  int value) const;
    virtual void setProperty(const PropertyName &, int value);

    void setFillColourMap(int);
    int getFillColourMap() const { return m_colourMap; }

    enum PlotStyle {
	PlotPoints,
	PlotStems,
	PlotConnectedPoints,
	PlotLines,
	PlotCurve,
	PlotSegmentation,
        PlotDiscreteCurves
    };

    void setPlotStyle(PlotStyle style);
    PlotStyle getPlotStyle() const { return m_plotStyle; }

    enum VerticalScale {
        AutoAlignScale,
        LinearScale,
        LogScale,
        PlusMinusOneScale
    };
    
    void setVerticalScale(VerticalScale scale);
    VerticalScale getVerticalScale() const { return m_verticalScale; }

    void setDrawSegmentDivisions(bool);
    bool getDrawSegmentDivisions() const { return m_drawSegmentDivisions; }

    void setShowDerivative(bool);
    bool getShowDerivative() const { return m_derivative; }

    virtual bool isLayerScrollable(const LayerGeometryProvider *v) const;

    virtual bool isLayerEditable() const { return true; }

    virtual int getCompletion(LayerGeometryProvider *) const { return m_model->getCompletion(); }

    virtual bool needsTextLabelHeight() const {
        return m_plotStyle == PlotSegmentation && m_model->hasTextLabels();
    }

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

    virtual bool getDisplayExtents(double &min, double &max) const;
    virtual bool setDisplayExtents(double min, double max);

    virtual int getVerticalZoomSteps(int &defaultStep) const;
    virtual int getCurrentVerticalZoomStep() const;
    virtual void setVerticalZoomStep(int);
    virtual RangeMapper *getNewVerticalZoomRangeMapper() const;

    virtual void toXml(QTextStream &stream, QString indent = "",
                       QString extraAttributes = "") const;

    void setProperties(const QXmlAttributes &attributes);

    virtual ColourSignificance getLayerColourSignificance() const {
        if (m_plotStyle == PlotSegmentation) {
            return ColourHasMeaningfulValue;
        } else {
            return ColourDistinguishes;
        }
    }

    /// VerticalScaleLayer and ColourScaleLayer methods
    virtual int getYForValue(LayerGeometryProvider *, double value) const;
    virtual double getValueForY(LayerGeometryProvider *, int y) const;
    virtual QString getScaleUnits() const;
    virtual QColor getColourForValue(LayerGeometryProvider *v, double value) const;

protected:
    void getScaleExtents(LayerGeometryProvider *, double &min, double &max, bool &log) const;
    bool shouldAutoAlign() const;

    SparseTimeValueModel::PointList getLocalPoints(LayerGeometryProvider *v, int) const;

    virtual int getDefaultColourHint(bool dark, bool &impose);

    SparseTimeValueModel *m_model;
    bool m_editing;
    SparseTimeValueModel::Point m_originalPoint;
    SparseTimeValueModel::Point m_editingPoint;
    SparseTimeValueModel::EditCommand *m_editingCommand;
    int m_colourMap;
    PlotStyle m_plotStyle;
    VerticalScale m_verticalScale;
    bool m_drawSegmentDivisions;
    bool m_derivative;

    mutable double m_scaleMinimum;
    mutable double m_scaleMaximum;

    void finish(SparseTimeValueModel::EditCommand *command) {
        Command *c = command->finish();
        if (c) CommandHistory::getInstance()->addCommand(c, false);
    }
};

#endif