view widgets/Panner.cpp @ 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 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 "Panner.h"

#include <QMouseEvent>
#include <QPaintEvent>
#include <QWheelEvent>
#include <QPainter>

#include <iostream>
#include <cmath>

Panner::Panner(QWidget *parent) :
    QWidget(parent),
    m_rectX(0),
    m_rectY(0),
    m_rectWidth(1),
    m_rectHeight(1),
    m_scrollUnit(0),
    m_defaultCentreX(0),
    m_defaultCentreY(0),
    m_defaultsSet(false),
    m_thumbColour(palette().highlightedText().color()),
    m_backgroundAlpha(255),
    m_thumbAlpha(255),
    m_clicked(false),
    m_dragStartX(0),
    m_dragStartY(0)
{
}

Panner::~Panner()
{
}

void
Panner::setAlpha(int backgroundAlpha, int thumbAlpha)
{
    m_backgroundAlpha = backgroundAlpha;
    m_thumbAlpha = thumbAlpha;
}

void
Panner::setScrollUnit(float unit)
{
    m_scrollUnit = unit;
}

void
Panner::scroll(bool up)
{
    float unit = m_scrollUnit;
    if (unit == 0.f) {
        unit = float(m_rectHeight) / (6 * float(height()));
        if (unit < 0.01f) unit = 0.01f;
    }

    if (!up) {
        m_rectY += unit;
    } else {
        m_rectY -= unit;
    }

    normalise();
    emitAndUpdate();
}

void
Panner::mousePressEvent(QMouseEvent *e)
{
    if (e->button() == Qt::MidButton ||
        ((e->button() == Qt::LeftButton) &&
         (e->modifiers() & Qt::ControlModifier))) {
        resetToDefault();
    } else if (e->button() == Qt::LeftButton) {
        m_clicked = true;
        m_clickPos = e->pos();
        m_dragStartX = m_rectX;
        m_dragStartY = m_rectY;
    }
}

void
Panner::mouseDoubleClickEvent(QMouseEvent *e)
{
    if (e->button() != Qt::LeftButton) {
        return;
    }

    emit doubleClicked();
}

void
Panner::mouseMoveEvent(QMouseEvent *e)
{
    if (!m_clicked) return;

    float dx = float(e->pos().x() - m_clickPos.x()) / float(width());
    float dy = float(e->pos().y() - m_clickPos.y()) / float(height());
    
    m_rectX = m_dragStartX + dx;
    m_rectY = m_dragStartY + dy;
    
    normalise();
    repaint();
    emit rectExtentsChanged(m_rectX, m_rectY, m_rectWidth, m_rectHeight);
    emit rectCentreMoved(centreX(), centreY());
}

void
Panner::mouseReleaseEvent(QMouseEvent *e)
{
    if (!m_clicked) return;

    mouseMoveEvent(e);
    m_clicked = false;
}

void
Panner::wheelEvent(QWheelEvent *e)
{
    scroll(e->delta() > 0);
}

void
Panner::enterEvent(QEvent *)
{
    emit mouseEntered();
}

void
Panner::leaveEvent(QEvent *)
{
    emit mouseLeft();
}

void
Panner::paintEvent(QPaintEvent *)
{
    QPainter paint(this);
    paint.setRenderHint(QPainter::Antialiasing, false);

    QColor bg(palette().background().color());
    bg.setAlpha(m_backgroundAlpha);

    paint.setPen(palette().dark().color());
    paint.setBrush(bg);
    paint.drawRect(0, 0, width()-1, height()-1);

    QColor hl(m_thumbColour);
    hl.setAlpha(m_thumbAlpha);

    paint.setBrush(hl);

    int rw = int(lrintf(float(width() - 1) * m_rectWidth));
    int rh = int(lrintf(float(height() - 1) * m_rectHeight));
    if (rw < 2) rw = 2;
    if (rh < 2) rh = 2;

    paint.drawRect(int(lrintf(float(width()) * m_rectX)),
                   int(lrintf(float(height()) * m_rectY)),
                   rw, rh);
}

void
Panner::normalise()
{
    if (m_rectWidth > 1.f) m_rectWidth = 1.f;
    if (m_rectHeight > 1.f) m_rectHeight = 1.f;
    if (m_rectX + m_rectWidth > 1.f) m_rectX = 1.f - m_rectWidth;
    if (m_rectX < 0) m_rectX = 0;
    if (m_rectY + m_rectHeight > 1.f) m_rectY = 1.f - m_rectHeight;
    if (m_rectY < 0) m_rectY = 0;

    if (!m_defaultsSet) {
        m_defaultCentreX = centreX();
        m_defaultCentreY = centreY();
        m_defaultsSet = true;
    }
}

void
Panner::emitAndUpdate()
{
    emit rectExtentsChanged(m_rectX, m_rectY, m_rectWidth, m_rectHeight);
    emit rectCentreMoved(centreX(), centreY());
    update();
}  

void
Panner::getRectExtents(float &x0, float &y0, float &width, float &height)
{
    x0 = m_rectX;
    y0 = m_rectY;
    width = m_rectWidth;
    height = m_rectHeight;
}

void
Panner::setRectExtents(float x0, float y0, float width, float height)
{
//    SVDEBUG << "Panner::setRectExtents(" << x0 << ", " << y0 << ", "
//              << width << ", " << height << ")" << endl;

    if (m_rectX == x0 &&
        m_rectY == y0 &&
        m_rectWidth == width &&
        m_rectHeight == height) {
        return;
    }

    m_rectX = x0;
    m_rectY = y0;
    m_rectWidth = width;
    m_rectHeight = height;

    normalise();
    emitAndUpdate();
}

void
Panner::setRectWidth(float width)
{
    if (m_rectWidth == width) return;
    m_rectWidth = width;
    normalise();
    emitAndUpdate();
}

void
Panner::setRectHeight(float height)
{
    if (m_rectHeight == height) return;
    m_rectHeight = height;
    normalise();
    emitAndUpdate();
}

void
Panner::setRectCentreX(float x)
{
    float x0 = x - m_rectWidth/2;
    if (x0 == m_rectX) return;
    m_rectX = x0;
    normalise();
    emitAndUpdate();
}

void
Panner::setRectCentreY(float y)
{
    float y0 = y - m_rectHeight/2;
    if (y0 == m_rectY) return;
    m_rectY = y0;
    normalise();
    emitAndUpdate();
}

QSize
Panner::sizeHint() const
{
    return QSize(30, 30);
}

void
Panner::setDefaultRectCentre(float cx, float cy)
{
    m_defaultCentreX = cx;
    m_defaultCentreY = cy;
    m_defaultsSet = true;
}

void
Panner::resetToDefault()
{
    float x0 = m_defaultCentreX - m_rectWidth/2;
    float y0 = m_defaultCentreY - m_rectHeight/2;
    if (x0 == m_rectX && y0 == m_rectY) return;
    m_rectX = x0;
    m_rectY = y0;
    normalise();
    emitAndUpdate();
}