comparison widgets/AudioDial.cpp @ 0:2a4f26e85b4c

initial import

+/* -*- c-basic-offset: 4 -*-  vi:set ts=8 sts=4 sw=4: */
+
+/*
+  A waveform viewer and audio annotation editor.
+  Chris Cannam, Queen Mary University of London, 2005
+    
+  This is experimental software.  Not for distribution.
+*/
+
+/**
+ * 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 <QImage>
+#include <QColormap>
+#include <QMouseEvent>
+#include <QPaintEvent>
+
+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_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 ( true/* 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;
+}
+
+
+// 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();
+    }
+}
+
+
+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
+