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-rw-r--r--muse2/awl/knob.cpp281
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diff --git a/muse2/awl/knob.cpp b/muse2/awl/knob.cpp
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+//=============================================================================
+// Awl
+// Audio Widget Library
+// $Id:$
+//
+// Copyright (C) 2002-2006 by Werner Schweer and others
+//
+// This program is free software; you can redistribute it and/or modify
+// it under the terms of the GNU General Public License version 2.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program; if not, write to the Free Software
+// Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+//=============================================================================
+
+#include "knob.h"
+
+namespace Awl {
+
+//---------------------------------------------------------
+// Knob
+/// this is the AwlKnob contructor
+//---------------------------------------------------------
+
+Knob::Knob(QWidget* parent)
+ : AbstractSlider(parent)
+ {
+ _scaleSize = 270;
+ _markSize = 6;
+ _border = 2;
+ points = 0;
+ }
+
+//---------------------------------------------------------
+// Knob
+//---------------------------------------------------------
+
+Knob::~Knob()
+ {
+ if (points)
+ delete points;
+ }
+
+//---------------------------------------------------------
+// setText
+//---------------------------------------------------------
+
+void Knob::setText(const QString& s)
+ {
+ if (s != _text) {
+ _text = s;
+ update();
+ }
+ }
+
+//---------------------------------------------------------
+// setScaleSize
+//! set the scale size in degrees
+//
+//! the scale size is the max moving angle measured
+//! in degrees
+//---------------------------------------------------------
+
+void Knob::setScaleSize(int val)
+ {
+ if (val != _scaleSize) {
+ _scaleSize = val;
+ update();
+ }
+ }
+
+//---------------------------------------------------------
+// setMarkSize
+//! set size of the center marker
+//---------------------------------------------------------
+
+void Knob::setMarkSize(int val)
+ {
+ if (val != _markSize) {
+ _markSize = val;
+ update();
+ }
+ }
+
+//---------------------------------------------------------
+// setBorder
+//! set border size
+//---------------------------------------------------------
+
+void Knob::setBorder(int val)
+ {
+ if (val != _border) {
+ _border = val;
+ update();
+ }
+ }
+
+//---------------------------------------------------------
+// mousePressEvent
+//---------------------------------------------------------
+
+void Knob::mousePressEvent(QMouseEvent* ev)
+ {
+ startY = ev->y();
+ emit sliderPressed(_id);
+ if (_center) {
+ QRect r(points->boundingRect().toRect());
+ if (r.contains(ev->pos())) {
+ setValue(.0f);
+ valueChange();
+ update();
+ }
+ }
+ }
+
+//---------------------------------------------------------
+// mouseReleaseEvent
+//---------------------------------------------------------
+
+void Knob::mouseReleaseEvent(QMouseEvent*)
+ {
+ emit sliderReleased(_id);
+ }
+
+//---------------------------------------------------------
+// mouseMoveEvent
+//---------------------------------------------------------
+
+void Knob::mouseMoveEvent(QMouseEvent* ev)
+ {
+ int y = ev->y();
+ double delta = (maxValue() - minValue()) / 100.0f;
+ if (delta == 0)
+ delta = 1;
+ _value += (startY - y) * delta;
+ if (_value < minValue())
+ _value = _minValue;
+ else if (_value > maxValue())
+ _value = _maxValue;
+ startY = y;
+ valueChange();
+ update();
+ }
+
+//---------------------------------------------------------
+// paintEvent
+//---------------------------------------------------------
+
+void Knob::paintEvent(QPaintEvent* ev)
+ {
+ QRect rr(ev->rect());
+ QPainter p(this);
+ p.setRenderHint(QPainter::Antialiasing, true);
+
+ int markSize2 = _markSize/2;
+ int restR = 360 - _scaleSize;
+ int w = width() - _scaleWidth - 2 * _border;
+ int h = height() - _scaleWidth/2 - 2 * _border;
+
+ int xoffset, yoffset;
+ if (_center)
+ h -= _markSize;
+ if (w > h) {
+ yoffset = 0;
+ xoffset = (w - h) / 2;
+ w = h;
+ }
+ else {
+ xoffset = 0;
+ // yoffset = (h - w) / 2; // center
+ yoffset = h - w; // top align
+ h = w;
+ }
+
+ int x = xoffset + _scaleWidth / 2 + _border;
+ int y = yoffset + _scaleWidth / 2 + _border + (_center ? _markSize+_scaleWidth/2 : 0);
+ QRectF ar(x, y, w, h);
+
+ QColor sc(isEnabled() ? _scaleColor : Qt::gray);
+ QColor svc(isEnabled() ? _scaleValueColor : Qt::gray);
+
+ //-----------------------------------------
+ // draw arc
+ //-----------------------------------------
+
+ double dvalue = maxValue() - minValue();
+ if (_center) {
+ int size = _scaleSize * 8;
+ if (_value >= 0) {
+ int offset = (restR-180) * 8;
+ int r1 = int (size * _value / maxValue());
+ int r2 = size - r1;
+ p.setPen(QPen(sc, _scaleWidth));
+ if (r2 > 1)
+ p.drawArc(ar, offset, r2);
+ if (size > 1)
+ p.drawArc(ar, 90*16, size);
+ if (r1 > 1) {
+ p.setPen(QPen(svc, _scaleWidth));
+ p.drawArc(ar, offset+r2, r1);
+ }
+ }
+ else {
+ // int offset = (restR+180) * 8;
+ int r1 = int(size * _value / minValue());
+ int r2 = size - r1;
+
+ p.setPen(QPen(sc, _scaleWidth));
+ if (size > 1)
+ p.drawArc(ar, (restR-180)*8, size);
+ if (r2 > 1)
+ p.drawArc(ar, 90 * 16 + r1, r2);
+ if (r1 > 1) {
+ p.setPen(QPen(svc, _scaleWidth));
+ p.drawArc(ar, 90*16, r1);
+ }
+ }
+ }
+ else {
+ int offset = (180-restR) * 8;
+ int size = _scaleSize * 16;
+ int r1 = int(size * (_value - minValue()) / dvalue);
+ int r2 = size - r1;
+ if (r2 >= 1) {
+ p.setPen(QPen(sc, _scaleWidth));
+ p.drawArc(ar, -offset, r2);
+ }
+ if (r1 >= 1) {
+ p.setPen(QPen(svc, _scaleWidth));
+ p.drawArc(ar, r2-offset, r1);
+ }
+ }
+
+ //-----------------------------------------
+ // draw pointer
+ //-----------------------------------------
+
+ p.setPen(QPen(svc, _scaleWidth));
+ double r1 = double(_scaleSize) * (_value-minValue()) / dvalue + 90.0
+ + double(restR/2);
+ r1 = r1 / 180.0 * M_PI; // convert to radians
+ int rd = w/2;
+ int x1 = x + rd;
+ int y1 = y + rd;
+ int x2 = x1 + lrint(cos(r1) * double(rd));
+ int y2 = y1 + lrint(sin(r1) * double(rd));
+ p.drawLine(x1, y1, x2, y2);
+
+ //-----------------------------------------
+ // draw center mark
+ //-----------------------------------------
+
+ p.setPen(QPen(svc, 0));
+ p.setBrush(svc);
+ if (_center) {
+ if (points)
+ delete points;
+ qreal x = ar.width() / 2 + ar.x();
+ qreal y = ar.y() - _markSize - _scaleWidth/2;
+ points = new QPainterPath(QPointF(x - markSize2, y));
+ points->lineTo(x + markSize2, y);
+ points->lineTo(x, _markSize + y);
+ points->closeSubpath();
+ p.drawPath(*points);
+ }
+
+ //-----------------------------------------
+ // draw text
+ //-----------------------------------------
+
+ if (!_text.isEmpty()) {
+ p.drawText(rect(), Qt::AlignBottom | Qt::AlignHCenter, _text);
+ }
+ }
+}
+
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