Qwt User's Guide 6.3.0

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qwt_knob.cpp
1/******************************************************************************
2 * Qwt Widget Library
3 * Copyright (C) 1997 Josef Wilgen
4 * Copyright (C) 2002 Uwe Rathmann
5 *
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the Qwt License, Version 1.0
8 *****************************************************************************/
9
10#include "qwt_knob.h"
11#include "qwt_round_scale_draw.h"
12#include "qwt_painter.h"
13#include "qwt_scale_map.h"
14#include "qwt_math.h"
15#include "qwt.h"
16
17#include <qpainter.h>
18#include <qpalette.h>
19#include <qstyle.h>
20#include <qstyleoption.h>
21#include <qevent.h>
22#include <qmargins.h>
23#include <qmath.h>
24
25 static QSize qwtKnobSizeHint( const QwtKnob* knob, int min )
26{
27 int knobWidth = knob->knobWidth();
28 if ( knobWidth <= 0 )
29 knobWidth = qMax( 3 * knob->markerSize(), min );
30
31 // Add the scale radial thickness to the knobWidth
32 const int extent = qwtCeil( knob->scaleDraw()->extent( knob->font() ) );
33 const int d = 2 * ( extent + 4 ) + knobWidth;
34
35 const QMargins m = knob->contentsMargins();
36 return QSize( d + m.left() + m.right(), d + m.top() + m.bottom() );
37}
38
39 static inline double qwtToScaleAngle( double angle )
40{
41 // the map is counter clockwise with the origin
42 // at 90° using angles from -180° -> 180°
43
44 double a = 90.0 - angle;
45 if ( a <= -180.0 )
46 a += 360.0;
47 else if ( a >= 180.0 )
48 a -= 360.0;
49
50 return a;
51}
52
53 static double qwtToDegrees( double value )
54{
55 return qwtNormalizeDegrees( 90.0 - value );
56}
57
58 class QwtKnob::PrivateData
59{
60 public:
61 PrivateData()
62 : knobStyle( QwtKnob::Raised )
63 , markerStyle( QwtKnob::Notch )
64 , borderWidth( 2 )
65 , borderDist( 4 )
66 , scaleDist( 4 )
67 , maxScaleTicks( 11 )
68 , knobWidth( 0 )
69 , alignment( Qt::AlignCenter )
70 , markerSize( 8 )
71 , totalAngle( 270.0 )
72 , mouseOffset( 0.0 )
73 {
74 }
75
76 QwtKnob::KnobStyle knobStyle;
77 QwtKnob::MarkerStyle markerStyle;
78
79 int borderWidth;
80 int borderDist;
81 int scaleDist;
82 int maxScaleTicks;
83 int knobWidth;
84 Qt::Alignment alignment;
85 int markerSize;
86
87 double totalAngle;
88
89 double mouseOffset;
90};
91
103 QwtKnob::QwtKnob( QWidget* parent )
104 : QwtAbstractSlider( parent )
105{
106 m_data = new PrivateData;
107
108 setScaleDraw( new QwtRoundScaleDraw() );
109
110 setTotalAngle( 270.0 );
111
112 setScale( 0.0, 10.0 );
113 setValue( 0.0 );
114
115 setSizePolicy( QSizePolicy::MinimumExpanding,
116 QSizePolicy::MinimumExpanding );
117}
118
120 QwtKnob::~QwtKnob()
121{
122 delete m_data;
123}
124
131 void QwtKnob::setKnobStyle( KnobStyle knobStyle )
132{
133 if ( m_data->knobStyle != knobStyle )
134 {
135 m_data->knobStyle = knobStyle;
136 update();
137 }
138}
139
144 QwtKnob::KnobStyle QwtKnob::knobStyle() const
145{
146 return m_data->knobStyle;
147}
148
155 void QwtKnob::setMarkerStyle( MarkerStyle markerStyle )
156{
157 if ( m_data->markerStyle != markerStyle )
158 {
159 m_data->markerStyle = markerStyle;
160 update();
161 }
162}
163
168 QwtKnob::MarkerStyle QwtKnob::markerStyle() const
169{
170 return m_data->markerStyle;
171}
172
185 void QwtKnob::setTotalAngle ( double angle )
186{
187 angle = qBound( 10.0, angle, 360.0 );
188
189 if ( angle != m_data->totalAngle )
190 {
191 m_data->totalAngle = angle;
192
193 scaleDraw()->setAngleRange( -0.5 * m_data->totalAngle,
194 0.5 * m_data->totalAngle );
195
196 updateGeometry();
197 update();
198 }
199}
200
205 double QwtKnob::totalAngle() const
206{
207 return m_data->totalAngle;
208}
209
219 void QwtKnob::setNumTurns( int numTurns )
220{
221 numTurns = qMax( numTurns, 1 );
222
223 if ( numTurns == 1 && m_data->totalAngle <= 360.0 )
224 return;
225
226 const double angle = numTurns * 360.0;
227 if ( angle != m_data->totalAngle )
228 {
229 m_data->totalAngle = angle;
230
231 scaleDraw()->setAngleRange( -0.5 * m_data->totalAngle,
232 0.5 * m_data->totalAngle );
233
234 updateGeometry();
235 update();
236 }
237}
238
245 int QwtKnob::numTurns() const
246{
247 return qwtCeil( m_data->totalAngle / 360.0 );
248}
249
259 void QwtKnob::setScaleDraw( QwtRoundScaleDraw* scaleDraw )
260{
261 setAbstractScaleDraw( scaleDraw );
262 setTotalAngle( m_data->totalAngle );
263
264 updateGeometry();
265 update();
266}
267
272 const QwtRoundScaleDraw* QwtKnob::scaleDraw() const
273{
274 return static_cast< const QwtRoundScaleDraw* >( abstractScaleDraw() );
275}
276
281 QwtRoundScaleDraw* QwtKnob::scaleDraw()
282{
283 return static_cast< QwtRoundScaleDraw* >( abstractScaleDraw() );
284}
285
292QRect QwtKnob::knobRect() const
293{
294 const QRect cr = contentsRect();
295
296 const int extent = qwtCeil( scaleDraw()->extent( font() ) );
297 const int d = extent + m_data->scaleDist;
298
299 int w = m_data->knobWidth;
300 if ( w <= 0 )
301 {
302 const int dim = qMin( cr.width(), cr.height() );
303
304 w = dim - 2 * ( d );
305 w = qMax( 0, w );
306 }
307
308 QRect r( 0, 0, w, w );
309
310 if ( m_data->alignment & Qt::AlignLeft )
311 {
312 r.moveLeft( cr.left() + d );
313 }
314 else if ( m_data->alignment & Qt::AlignRight )
315 {
316 r.moveRight( cr.right() - d );
317 }
318 else
319 {
320 r.moveCenter( QPoint( cr.center().x(), r.center().y() ) );
321 }
322
323 if ( m_data->alignment & Qt::AlignTop )
324 {
325 r.moveTop( cr.top() + d );
326 }
327 else if ( m_data->alignment & Qt::AlignBottom )
328 {
329 r.moveBottom( cr.bottom() - d );
330 }
331 else
332 {
333 r.moveCenter( QPoint( r.center().x(), cr.center().y() ) );
334 }
335
336 return r;
337}
338
347 bool QwtKnob::isScrollPosition( const QPoint& pos ) const
348{
349 const QRect kr = knobRect();
350
351 const QRegion region( kr, QRegion::Ellipse );
352 if ( region.contains( pos ) && ( pos != kr.center() ) )
353 {
354 const double angle = QLineF( kr.center(), pos ).angle();
355 const double valueAngle = qwtToDegrees( scaleMap().transform( value() ) );
356
357 m_data->mouseOffset = qwtNormalizeDegrees( angle - valueAngle );
358
359 return true;
360 }
361
362 return false;
363}
364
373 double QwtKnob::scrolledTo( const QPoint& pos ) const
374{
375 double angle = QLineF( rect().center(), pos ).angle();
376 angle = qwtNormalizeDegrees( angle - m_data->mouseOffset );
377
378 if ( scaleMap().pDist() > 360.0 )
379 {
380 angle = qwtToDegrees( angle );
381
382 const double v = scaleMap().transform( value() );
383
384 int numTurns = qwtFloor( ( v - scaleMap().p1() ) / 360.0 );
385
386 double valueAngle = qwtNormalizeDegrees( v );
387 if ( qAbs( valueAngle - angle ) > 180.0 )
388 {
389 numTurns += ( angle > valueAngle ) ? -1 : 1;
390 }
391
392 angle += scaleMap().p1() + numTurns * 360.0;
393
394 if ( !wrapping() )
395 {
396 const double boundedAngle =
397 qBound( scaleMap().p1(), angle, scaleMap().p2() );
398
399 m_data->mouseOffset += ( boundedAngle - angle );
400 angle = boundedAngle;
401 }
402 }
403 else
404 {
405 angle = qwtToScaleAngle( angle );
406
407 double boundedAngle = qBound( scaleMap().p1(), angle, scaleMap().p2() );
408
409 if ( !wrapping() )
410 {
411 const double currentAngle = scaleMap().transform( value() );
412
413 if ( ( currentAngle > 90.0 ) && ( boundedAngle < -90.0 ) )
414 boundedAngle = scaleMap().p2();
415 else if ( ( currentAngle < -90.0 ) && ( boundedAngle > 90.0 ) )
416 boundedAngle = scaleMap().p1();
417
418 m_data->mouseOffset += ( boundedAngle - angle );
419 }
420
421 angle = boundedAngle;
422 }
423
424 return scaleMap().invTransform( angle );
425}
426
431 void QwtKnob::changeEvent( QEvent* event )
432{
433 switch( event->type() )
434 {
435 case QEvent::StyleChange:
436 case QEvent::FontChange:
437 {
438 updateGeometry();
439 update();
440 break;
441 }
442 default:
443 break;
444 }
445}
446
451 void QwtKnob::paintEvent( QPaintEvent* event )
452{
453 const QRectF knobRect = this->knobRect();
454
455 QPainter painter( this );
456 painter.setClipRegion( event->region() );
457
458 QStyleOption opt;
459 opt.initFrom(this);
460 style()->drawPrimitive(QStyle::PE_Widget, &opt, &painter, this);
461
462 painter.setRenderHint( QPainter::Antialiasing, true );
463
464 if ( !knobRect.contains( event->region().boundingRect() ) )
465 {
466 scaleDraw()->setRadius( 0.5 * knobRect.width() + m_data->scaleDist );
467 scaleDraw()->moveCenter( knobRect.center() );
468
469 scaleDraw()->draw( &painter, palette() );
470 }
471
472 drawKnob( &painter, knobRect );
473
474 drawMarker( &painter, knobRect,
475 qwtNormalizeDegrees( scaleMap().transform( value() ) ) );
476
477 painter.setRenderHint( QPainter::Antialiasing, false );
478
479 if ( hasFocus() )
480 drawFocusIndicator( &painter );
481}
482
489 void QwtKnob::drawKnob( QPainter* painter, const QRectF& knobRect ) const
490{
491 double dim = qMin( knobRect.width(), knobRect.height() );
492 dim -= m_data->borderWidth * 0.5;
493
494 QRectF aRect( 0, 0, dim, dim );
495 aRect.moveCenter( knobRect.center() );
496
497 QPen pen( Qt::NoPen );
498 if ( m_data->borderWidth > 0 )
499 {
500 QColor c1 = palette().color( QPalette::Light );
501 QColor c2 = palette().color( QPalette::Dark );
502
503 QLinearGradient gradient( aRect.topLeft(), aRect.bottomRight() );
504 gradient.setColorAt( 0.0, c1 );
505 gradient.setColorAt( 0.3, c1 );
506 gradient.setColorAt( 0.7, c2 );
507 gradient.setColorAt( 1.0, c2 );
508
509 pen = QPen( gradient, m_data->borderWidth );
510 }
511
512 QBrush brush;
513 switch( m_data->knobStyle )
514 {
515 case QwtKnob::Raised:
516 {
517 double off = 0.3 * knobRect.width();
518 QRadialGradient gradient( knobRect.center(),
519 knobRect.width(), knobRect.topLeft() + QPointF( off, off ) );
520
521 gradient.setColorAt( 0.0, palette().color( QPalette::Midlight ) );
522 gradient.setColorAt( 1.0, palette().color( QPalette::Button ) );
523
524 brush = QBrush( gradient );
525
526 break;
527 }
528 case QwtKnob::Styled:
529 {
530 QRadialGradient gradient(knobRect.center().x() - knobRect.width() / 3,
531 knobRect.center().y() - knobRect.height() / 2,
532 knobRect.width() * 1.3,
533 knobRect.center().x(),
534 knobRect.center().y() - knobRect.height() / 2);
535
536 const QColor c = palette().color( QPalette::Button );
537 gradient.setColorAt(0, c.lighter(110) );
538 gradient.setColorAt( 0.5, c);
539 gradient.setColorAt( 0.501, c.darker(102) );
540 gradient.setColorAt(1, c.darker(115) );
541
542 brush = QBrush( gradient );
543
544 break;
545 }
546 case QwtKnob::Sunken:
547 {
548 QLinearGradient gradient(
549 knobRect.topLeft(), knobRect.bottomRight() );
550 gradient.setColorAt( 0.0, palette().color( QPalette::Mid ) );
551 gradient.setColorAt( 0.5, palette().color( QPalette::Button ) );
552 gradient.setColorAt( 1.0, palette().color( QPalette::Midlight ) );
553 brush = QBrush( gradient );
554
555 break;
556 }
557 case QwtKnob::Flat:
558 default:
559 brush = palette().brush( QPalette::Button );
560 }
561
562 painter->setPen( pen );
563 painter->setBrush( brush );
564 painter->drawEllipse( aRect );
565}
566
567
576 void QwtKnob::drawMarker( QPainter* painter,
577 const QRectF& rect, double angle ) const
578{
579 if ( m_data->markerStyle == NoMarker || !isValid() )
580 return;
581
582 const double radians = qwtRadians( angle );
583 const double sinA = -qFastSin( radians );
584 const double cosA = qFastCos( radians );
585
586 const double xm = rect.center().x();
587 const double ym = rect.center().y();
588 const double margin = 4.0;
589
590 double radius = 0.5 * ( rect.width() - m_data->borderWidth ) - margin;
591 if ( radius < 1.0 )
592 radius = 1.0;
593
594 double markerSize = m_data->markerSize;
595 if ( markerSize <= 0 )
596 markerSize = qRound( 0.4 * radius );
597
598 switch ( m_data->markerStyle )
599 {
600 case Notch:
601 case Nub:
602 {
603 const double dotWidth = qwtMinF( markerSize, radius );
604
605 const double dotCenterDist = radius - 0.5 * dotWidth;
606 if ( dotCenterDist > 0.0 )
607 {
608 const QPointF center( xm - sinA * dotCenterDist,
609 ym - cosA * dotCenterDist );
610
611 QRectF ellipse( 0.0, 0.0, dotWidth, dotWidth );
612 ellipse.moveCenter( center );
613
614 QColor c1 = palette().color( QPalette::Light );
615 QColor c2 = palette().color( QPalette::Mid );
616
617 if ( m_data->markerStyle == Notch )
618 qSwap( c1, c2 );
619
620 QLinearGradient gradient(
621 ellipse.topLeft(), ellipse.bottomRight() );
622 gradient.setColorAt( 0.0, c1 );
623 gradient.setColorAt( 1.0, c2 );
624
625 painter->setPen( Qt::NoPen );
626 painter->setBrush( gradient );
627
628 painter->drawEllipse( ellipse );
629 }
630 break;
631 }
632 case Dot:
633 {
634 const double dotWidth = qwtMinF( markerSize, radius);
635
636 const double dotCenterDist = radius - 0.5 * dotWidth;
637 if ( dotCenterDist > 0.0 )
638 {
639 const QPointF center( xm - sinA * dotCenterDist,
640 ym - cosA * dotCenterDist );
641
642 QRectF ellipse( 0.0, 0.0, dotWidth, dotWidth );
643 ellipse.moveCenter( center );
644
645 painter->setPen( Qt::NoPen );
646 painter->setBrush( palette().color( QPalette::ButtonText ) );
647 painter->drawEllipse( ellipse );
648 }
649
650 break;
651 }
652 case Tick:
653 {
654 const double rb = qwtMaxF( radius - markerSize, 1.0 );
655 const double re = radius;
656
657 const QLineF line( xm - sinA * rb, ym - cosA * rb,
658 xm - sinA * re, ym - cosA * re );
659
660 QPen pen( palette().color( QPalette::ButtonText ), 0 );
661 pen.setCapStyle( Qt::FlatCap );
662 painter->setPen( pen );
663 painter->drawLine ( line );
664
665 break;
666 }
667 case Triangle:
668 {
669 const double rb = qwtMaxF( radius - markerSize, 1.0 );
670 const double re = radius;
671
672 painter->translate( rect.center() );
673 painter->rotate( angle - 90.0 );
674
675 QPolygonF polygon;
676 polygon += QPointF( re, 0.0 );
677 polygon += QPointF( rb, 0.5 * ( re - rb ) );
678 polygon += QPointF( rb, -0.5 * ( re - rb ) );
679
680 painter->setPen( Qt::NoPen );
681 painter->setBrush( palette().color( QPalette::ButtonText ) );
682 painter->drawPolygon( polygon );
683
684 painter->resetTransform();
685
686 break;
687 }
688 default:
689 break;
690 }
691}
692
697 void QwtKnob::drawFocusIndicator( QPainter* painter ) const
698{
699 const QRect cr = contentsRect();
700
701 int w = m_data->knobWidth;
702 if ( w <= 0 )
703 {
704 w = qMin( cr.width(), cr.height() );
705 }
706 else
707 {
708 const int extent = qCeil( scaleDraw()->extent( font() ) );
709 w += 2 * ( extent + m_data->scaleDist );
710 }
711
712 QRect focusRect( 0, 0, w, w );
713 focusRect.moveCenter( cr.center() );
714
715 QwtPainter::drawFocusRect( painter, this, focusRect );
716}
717
730 void QwtKnob::setAlignment( Qt::Alignment alignment )
731{
732 if ( m_data->alignment != alignment )
733 {
734 m_data->alignment = alignment;
735 update();
736 }
737}
738
743Qt::Alignment QwtKnob::alignment() const
744{
745 return m_data->alignment;
746}
747
759 void QwtKnob::setKnobWidth( int width )
760{
761 width = qMax( width, 0 );
762
763 if ( width != m_data->knobWidth )
764 {
765 QSizePolicy::Policy policy;
766 if ( width > 0 )
767 policy = QSizePolicy::Minimum;
768 else
769 policy = QSizePolicy::MinimumExpanding;
770
771 setSizePolicy( policy, policy );
772
773 m_data->knobWidth = width;
774
775 updateGeometry();
776 update();
777 }
778}
779
781 int QwtKnob::knobWidth() const
782{
783 return m_data->knobWidth;
784}
785
790 void QwtKnob::setBorderWidth( int borderWidth )
791{
792 m_data->borderWidth = qMax( borderWidth, 0 );
793
794 updateGeometry();
795 update();
796}
797
799 int QwtKnob::borderWidth() const
800{
801 return m_data->borderWidth;
802}
803
812 void QwtKnob::setMarkerSize( int size )
813{
814 if ( m_data->markerSize != size )
815 {
816 m_data->markerSize = size;
817 update();
818 }
819}
820
825 int QwtKnob::markerSize() const
826{
827 return m_data->markerSize;
828}
829
833QSize QwtKnob::sizeHint() const
834{
835 const QSize hint = qwtKnobSizeHint( this, 50 );
836 return qwtExpandedToGlobalStrut( hint );
837}
838
843QSize QwtKnob::minimumSizeHint() const
844{
845 return qwtKnobSizeHint( this, 20 );
846}
847
848#include "moc_qwt_knob.cpp"
QwtAbstractScaleDraw::draw
virtual void draw(QPainter *, const QPalette &) const
Draw the scale.
Definition qwt_abstract_scale_draw.cpp:169
QwtAbstractScale::scaleMap
const QwtScaleMap & scaleMap() const
Definition qwt_abstract_scale.cpp:357
QwtAbstractScale::abstractScaleDraw
const QwtAbstractScaleDraw * abstractScaleDraw() const
Definition qwt_abstract_scale.cpp:302
QwtAbstractScale::transform
int transform(double) const
Definition qwt_abstract_scale.cpp:369
QwtAbstractScale::setAbstractScaleDraw
void setAbstractScaleDraw(QwtAbstractScaleDraw *)
Set a scale draw.
Definition qwt_abstract_scale.cpp:277
QwtAbstractScale::setScale
void setScale(double lowerBound, double upperBound)
Specify a scale.
Definition qwt_abstract_scale.cpp:130
QwtAbstractSlider
An abstract base class for slider widgets with a scale.
Definition qwt_abstract_slider.h:33
QwtAbstractSlider::setValue
void setValue(double value)
Definition qwt_abstract_slider.cpp:570
QwtAbstractSlider::wrapping
bool wrapping() const
Definition qwt_abstract_slider.cpp:608
QwtAbstractSlider::isValid
bool isValid() const
Definition qwt_abstract_slider.cpp:125
QwtAbstractSlider::value
double value() const
Returns the current value.
Definition qwt_abstract_slider.cpp:587
QwtKnob
The Knob Widget.
Definition qwt_knob.h:43
QwtKnob::scrolledTo
virtual double scrolledTo(const QPoint &) const override
Determine the value for a new position of the mouse.
Definition qwt_knob.cpp:373
QwtKnob::~QwtKnob
virtual ~QwtKnob()
Destructor.
Definition qwt_knob.cpp:120
QwtKnob::setKnobWidth
void setKnobWidth(int)
Change the knob's width.
Definition qwt_knob.cpp:759
QwtKnob::setKnobStyle
void setKnobStyle(KnobStyle)
Set the knob type.
Definition qwt_knob.cpp:131
QwtKnob::knobWidth
int knobWidth() const
Return the width of the knob.
Definition qwt_knob.cpp:781
QwtKnob::alignment
Qt::Alignment alignment() const
Definition qwt_knob.cpp:743
QwtKnob::isScrollPosition
virtual bool isScrollPosition(const QPoint &) const override
Determine what to do when the user presses a mouse button.
Definition qwt_knob.cpp:347
QwtKnob::MarkerStyle
MarkerStyle
Marker type.
Definition qwt_knob.h:96
QwtKnob::Nub
@ Nub
Definition qwt_knob.h:113
QwtKnob::Dot
@ Dot
Paint a circle in QPalette::ButtonText color.
Definition qwt_knob.h:107
QwtKnob::Tick
@ Tick
Paint a single tick in QPalette::ButtonText color.
Definition qwt_knob.h:101
QwtKnob::Triangle
@ Triangle
Paint a triangle in QPalette::ButtonText color.
Definition qwt_knob.h:104
QwtKnob::Notch
@ Notch
Definition qwt_knob.h:119
QwtKnob::NoMarker
@ NoMarker
Don't paint any marker.
Definition qwt_knob.h:98
QwtKnob::scaleDraw
const QwtRoundScaleDraw * scaleDraw() const
Definition qwt_knob.cpp:272
QwtKnob::QwtKnob
QwtKnob(QWidget *parent=NULL)
Constructor.
Definition qwt_knob.cpp:103
QwtKnob::setTotalAngle
void setTotalAngle(double angle)
Set the total angle by which the knob can be turned.
Definition qwt_knob.cpp:185
QwtKnob::setMarkerSize
void setMarkerSize(int)
Set the size of the marker.
Definition qwt_knob.cpp:812
QwtKnob::drawFocusIndicator
virtual void drawFocusIndicator(QPainter *) const
Definition qwt_knob.cpp:697
QwtKnob::setNumTurns
void setNumTurns(int)
Set the number of turns.
Definition qwt_knob.cpp:219
QwtKnob::markerStyle
MarkerStyle markerStyle() const
Definition qwt_knob.cpp:168
QwtKnob::knobRect
QRect knobRect() const
Definition qwt_knob.cpp:292
QwtKnob::markerSize
int markerSize() const
Definition qwt_knob.cpp:825
QwtKnob::changeEvent
virtual void changeEvent(QEvent *) override
Definition qwt_knob.cpp:431
QwtKnob::setMarkerStyle
void setMarkerStyle(MarkerStyle)
Set the marker type of the knob.
Definition qwt_knob.cpp:155
QwtKnob::knobStyle
KnobStyle knobStyle() const
Definition qwt_knob.cpp:144
QwtKnob::totalAngle
double totalAngle() const
Definition qwt_knob.cpp:205
QwtKnob::setAlignment
void setAlignment(Qt::Alignment)
Set the alignment of the knob.
Definition qwt_knob.cpp:730
QwtKnob::paintEvent
virtual void paintEvent(QPaintEvent *) override
Definition qwt_knob.cpp:451
QwtKnob::drawMarker
virtual void drawMarker(QPainter *, const QRectF &, double angle) const
Draw the marker at the knob's front.
Definition qwt_knob.cpp:576
QwtKnob::drawKnob
virtual void drawKnob(QPainter *, const QRectF &) const
Draw the knob.
Definition qwt_knob.cpp:489
QwtKnob::KnobStyle
KnobStyle
Style of the knob surface.
Definition qwt_knob.h:67
QwtKnob::Flat
@ Flat
Fill the knob with a brush from QPalette::Button.
Definition qwt_knob.h:69
QwtKnob::Sunken
@ Sunken
Definition qwt_knob.h:78
QwtKnob::Raised
@ Raised
Build a gradient from QPalette::Midlight and QPalette::Button.
Definition qwt_knob.h:72
QwtKnob::Styled
@ Styled
Definition qwt_knob.h:84
QwtKnob::numTurns
int numTurns() const
Definition qwt_knob.cpp:245
QwtKnob::borderWidth
int borderWidth() const
Return the border width.
Definition qwt_knob.cpp:799
QwtKnob::minimumSizeHint
virtual QSize minimumSizeHint() const override
Definition qwt_knob.cpp:843
QwtKnob::setBorderWidth
void setBorderWidth(int)
Set the knob's border width.
Definition qwt_knob.cpp:790
QwtKnob::sizeHint
virtual QSize sizeHint() const override
Definition qwt_knob.cpp:833
QwtKnob::setScaleDraw
void setScaleDraw(QwtRoundScaleDraw *)
Definition qwt_knob.cpp:259
QwtPainter::drawFocusRect
static void drawFocusRect(QPainter *, const QWidget *)
Draw a focus rectangle on a widget using its style.
Definition qwt_painter.cpp:805
QwtRoundScaleDraw
A class for drawing round scales.
Definition qwt_round_scale_draw.h:32
QwtRoundScaleDraw::extent
virtual double extent(const QFont &) const override
Definition qwt_round_scale_draw.cpp:255
QwtRoundScaleDraw::setRadius
void setRadius(double radius)
Definition qwt_round_scale_draw.cpp:66
QwtRoundScaleDraw::setAngleRange
void setAngleRange(double angle1, double angle2)
Adjust the baseline circle segment for round scales.
Definition qwt_round_scale_draw.cpp:118
QwtRoundScaleDraw::moveCenter
void moveCenter(double x, double y)
Move the center of the scale draw, leaving the radius unchanged.
Definition qwt_round_scale_draw.h:64
QwtScaleMap::p1
double p1() const
Definition qwt_scale_map.h:99
QwtScaleMap::transform
double transform(double s) const
Definition qwt_scale_map.h:137
QwtScaleMap::invTransform
double invTransform(double p) const
Definition qwt_scale_map.h:154
QwtScaleMap::p2
double p2() const
Definition qwt_scale_map.h:107