annotate widgets/AudioDial.cpp @ 77:fd348f36c0d3

* Implement harmonic cursor in spectrogram
* Implement layer export.  This doesn't quite do the right thing for the SV
  XML layer export yet -- it doesn't include layer display information, so
  when imported, it only creates an invisible model.  Could also do with
  fixing CSV file import so as to work correctly for note and text layers.

/* -*- 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 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.
*/

/**
 * A rotary dial widget.
 *
 * Based on an original design by Thorsten Wilms.
 *
 * Implemented as a widget for the Rosegarden MIDI and audio sequencer
 * and notation editor by Chris Cannam.
 *
 * Extracted into a standalone Qt3 widget by Pedro Lopez-Cabanillas
 * and adapted for use in QSynth.
 * 
 * Ported to Qt4 by Chris Cannam.
 *
 * This file copyright 2003-2005 Chris Cannam, copyright 2005 Pedro
 * Lopez-Cabanillas.
 *
 * 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 "AudioDial.h"

#include <cmath>
#include <iostream>

#include <QTimer>
#include <QPainter>
#include <QPixmap>
#include <QColormap>
#include <QMouseEvent>
#include <QPaintEvent>
#include <QInputDialog>

using std::endl;
using std::cerr;


//!!! Pedro updated his version to use my up/down response code from RG -- need to grab that code in preference to this version from Rui


//-------------------------------------------------------------------------
// AudioDial - Instance knob widget class.
//

#define AUDIO_DIAL_MIN (0.25 * M_PI)
#define AUDIO_DIAL_MAX (1.75 * M_PI)
#define AUDIO_DIAL_RANGE (AUDIO_DIAL_MAX - AUDIO_DIAL_MIN)


// Constructor.
AudioDial::AudioDial(QWidget *parent) :
    QDial(parent),
    m_knobColor(Qt::black), m_meterColor(Qt::white),
    m_defaultValue(0)
{
    m_mouseDial = false;
    m_mousePressed = false;
}


// Destructor.
AudioDial::~AudioDial (void)
{
}


void AudioDial::paintEvent(QPaintEvent *)
{
    QPainter paint;

    float angle = AUDIO_DIAL_MIN // offset
	+ (AUDIO_DIAL_RANGE *
	   (float(QDial::value() - QDial::minimum()) /
	    (float(QDial::maximum() - QDial::minimum()))));
    int degrees = int(angle * 180.0 / M_PI);

    int ns = notchSize();
    int numTicks = 1 + (maximum() + ns - minimum()) / ns;
	
    QColor knobColor(m_knobColor);
    if (knobColor == Qt::black)
	knobColor = palette().mid().color();

    QColor meterColor(m_meterColor);
    if (!isEnabled())
	meterColor = palette().mid().color();
    else if (m_meterColor == Qt::white)
	meterColor = palette().highlight().color();

    int m_size = width() < height() ? width() : height();
    int scale = 1;
    int width = m_size - 2*scale, height = m_size - 2*scale;

    paint.begin(this);
    paint.setRenderHint(QPainter::Antialiasing, true);
    paint.translate(1, 1);

    QPen pen;
    QColor c;

    // Knob body and face...

    c = knobColor;
    pen.setColor(knobColor);
    pen.setWidth(scale * 2);
    pen.setCapStyle(Qt::FlatCap);
	
    paint.setPen(pen);
    paint.setBrush(c);

    int indent = (int)(width * 0.15 + 1);

    paint.drawEllipse(indent-1, indent-1, width-2*indent, width-2*indent);

    pen.setWidth(3 * scale);
    int pos = indent-1 + (width-2*indent) / 20;
    int darkWidth = (width-2*indent) * 3 / 4;
    while (darkWidth) {
	c = c.light(102);
	pen.setColor(c);
	paint.setPen(pen);
	paint.drawEllipse(pos, pos, darkWidth, darkWidth);
	if (!--darkWidth) break;
	paint.drawEllipse(pos, pos, darkWidth, darkWidth);
	if (!--darkWidth) break;
	paint.drawEllipse(pos, pos, darkWidth, darkWidth);
	++pos; --darkWidth;
    }

    // Tick notches...

    if ( notchesVisible() ) {
//	std::cerr << "Notches visible" << std::endl;
	pen.setColor(palette().dark().color());
	pen.setWidth(scale);
	paint.setPen(pen);
	for (int i = 0; i < numTicks; ++i) {
	    int div = numTicks;
	    if (div > 1) --div;
	    drawTick(paint, AUDIO_DIAL_MIN + (AUDIO_DIAL_MAX - AUDIO_DIAL_MIN) * i / div,
		     width, true);
	}
    }

    // The bright metering bit...

    c = meterColor;
    pen.setColor(c);
    pen.setWidth(indent);
    paint.setPen(pen);

//    std::cerr << "degrees " << degrees << ", gives us " << -(degrees - 45) * 16 << std::endl;

    int arcLen = -(degrees - 45) * 16;
    if (arcLen == 0) arcLen = -16;

    paint.drawArc(indent/2, indent/2,
		  width-indent, width-indent, (180 + 45) * 16, arcLen);

    paint.setBrush(Qt::NoBrush);

    // Shadowing...

    pen.setWidth(scale);
    paint.setPen(pen);

    // Knob shadow...

    int shadowAngle = -720;
    c = knobColor.dark();
    for (int arc = 120; arc < 2880; arc += 240) {
	pen.setColor(c);
	paint.setPen(pen);
	paint.drawArc(indent, indent,
		      width-2*indent, width-2*indent, shadowAngle + arc, 240);
	paint.drawArc(indent, indent,
		      width-2*indent, width-2*indent, shadowAngle - arc, 240);
	c = c.light(110);
    }

    // Scale shadow...

    shadowAngle = 2160;
    c = palette().dark().color();
    for (int arc = 120; arc < 2880; arc += 240) {
	pen.setColor(c);
	paint.setPen(pen);
	paint.drawArc(scale/2, scale/2,
		      width-scale, width-scale, shadowAngle + arc, 240);
	paint.drawArc(scale/2, scale/2,
		      width-scale, width-scale, shadowAngle - arc, 240);
	c = c.light(108);
    }

    // Undraw the bottom part...

    pen.setColor(palette().background().color());
    pen.setWidth(scale * 4);
    paint.setPen(pen);
    paint.drawArc(scale/2, scale/2,
		  width-scale, width-scale, -45 * 16, -92 * 16);

    // Scale ends...

    pen.setColor(palette().dark().color());
    pen.setWidth(scale);
    paint.setPen(pen);
    for (int i = 0; i < numTicks; ++i) {
	if (i != 0 && i != numTicks - 1) continue;
	int div = numTicks;
	if (div > 1) --div;
	drawTick(paint, AUDIO_DIAL_MIN + (AUDIO_DIAL_MAX - AUDIO_DIAL_MIN) * i / div,
		 width, false);
    }

    // Pointer notch...

    float hyp = float(width) / 2.0;
    float len = hyp - indent;
    --len;

    float x0 = hyp;
    float y0 = hyp;

    float x = hyp - len * sin(angle);
    float y = hyp + len * cos(angle);

    c = palette().dark().color();
    pen.setColor(isEnabled() ? c.dark(130) : c);
    pen.setWidth(scale * 2);
    paint.setPen(pen);
    paint.drawLine(int(x0), int(y0), int(x), int(y));

    paint.end();
}


void AudioDial::drawTick(QPainter &paint,
			 float angle, int size, bool internal)
{
    float hyp = float(size) / 2.0;
    float x0 = hyp - (hyp - 1) * sin(angle);
    float y0 = hyp + (hyp - 1) * cos(angle);

//    cerr << "drawTick: angle " << angle << ", size " << size << ", internal " << internal << endl;
    
    if (internal) {

	float len = hyp / 4;
	float x1 = hyp - (hyp - len) * sin(angle);
	float y1 = hyp + (hyp - len) * cos(angle);
		
	paint.drawLine(int(x0), int(y0), int(x1), int(y1));

    } else {

	float len = hyp / 4;
	float x1 = hyp - (hyp + len) * sin(angle);
	float y1 = hyp + (hyp + len) * cos(angle);

	paint.drawLine(int(x0), int(y0), int(x1), int(y1));
    }
}


void AudioDial::setKnobColor(const QColor& color)
{
    m_knobColor = color;
    update();
}


void AudioDial::setMeterColor(const QColor& color)
{
    m_meterColor = color;
    update();
}


void AudioDial::setMouseDial(bool mouseDial)
{
    m_mouseDial = mouseDial;
}


void AudioDial::setDefaultValue(int defaultValue)
{
    m_defaultValue = defaultValue;
}


// Alternate mouse behavior event handlers.
void AudioDial::mousePressEvent(QMouseEvent *mouseEvent)
{
    if (m_mouseDial) {
	QDial::mousePressEvent(mouseEvent);
    } else if (mouseEvent->button() == Qt::LeftButton) {
	m_mousePressed = true;
	m_posMouse = mouseEvent->pos();
    } else if (mouseEvent->button() == Qt::MidButton) {
	int dv = m_defaultValue;
	if (dv < minimum()) dv = minimum();
	if (dv > maximum()) dv = maximum();
	setValue(m_defaultValue);
    }
}


void AudioDial::mouseDoubleClickEvent(QMouseEvent *mouseEvent)
{
    if (m_mouseDial) {
	QDial::mouseDoubleClickEvent(mouseEvent);
    } else if (mouseEvent->button() == Qt::LeftButton) {
	bool ok = false;
	int newValue = QInputDialog::getInteger
	    (this,
	     tr("Enter new value"),
	     tr("Select a new value in the range %1 to %2:")
	     .arg(minimum()).arg(maximum()),
	     value(), minimum(), maximum(), pageStep(), &ok);
	if (ok) {
	    setValue(newValue);
	}
    }
}


void AudioDial::mouseMoveEvent(QMouseEvent *mouseEvent)
{
    if (m_mouseDial) {
	QDial::mouseMoveEvent(mouseEvent);
    } else if (m_mousePressed) {
	const QPoint& posMouse = mouseEvent->pos();
	int v = QDial::value()
	    + (posMouse.x() - m_posMouse.x())
	    + (m_posMouse.y() - posMouse.y());
	if (v > QDial::maximum())
	    v = QDial::maximum();
	else
	    if (v < QDial::minimum())
		v = QDial::minimum();
	m_posMouse = posMouse;
	QDial::setValue(v);
    }
}


void AudioDial::mouseReleaseEvent(QMouseEvent *mouseEvent)
{
    if (m_mouseDial) {
	QDial::mouseReleaseEvent(mouseEvent);
    } else if (m_mousePressed) {
	m_mousePressed = false;
    }
}

#ifdef INCLUDE_MOCFILES
#include "AudioDial.moc.cpp"
#endif