Qwt User's Guide: qwt_dial_needle.cpp Source File

Qwt User's Guide 6.3.0

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qwt_dial_needle.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_dial_needle.h"
11#include "qwt_math.h"
12
13#include <qapplication.h>
14#include <qpainter.h>
15#include <qpainterpath.h>
16#include <qmath.h>
17
18static void qwtDrawStyle1Needle( QPainter* painter,
19 const QPalette& palette, QPalette::ColorGroup colorGroup, qreal length )
20{
21 const qreal r[] = { 0.4, 0.3, 1, 0.8, 1, 0.3, 0.4 };
22 const qreal a[] = { -45, -20, -15, 0, 15, 20, 45 };
23
24 QPainterPath path;
25 for ( int i = 0; i < 7; i++ )
26 {
27 const qreal angle = a[i] / 180.0 * M_PI;
28 const qreal radius = r[i] * length;
29
30 const qreal x = radius * qFastCos( angle );
31 const qreal y = radius * qFastSin( angle );
32
33 path.lineTo( x, -y );
34 }
35
36 painter->setPen( Qt::NoPen );
37 painter->setBrush( palette.brush( colorGroup, QPalette::Light ) );
38 painter->drawPath( path );
39}
40
41static void qwtDrawStyle2Needle( QPainter* painter,
42 const QPalette& palette, QPalette::ColorGroup colorGroup, qreal length )
43{
44 const qreal ratioX = 0.7;
45 const qreal ratioY = 0.3;
46
47 QPainterPath path1;
48 path1.lineTo( ratioX * length, 0.0 );
49 path1.lineTo( length, ratioY * length );
50
51 QPainterPath path2;
52 path2.lineTo( ratioX * length, 0.0 );
53 path2.lineTo( length, -ratioY * length );
54
55 painter->setPen( Qt::NoPen );
56
57 painter->setBrush( palette.brush( colorGroup, QPalette::Light ) );
58 painter->drawPath( path1 );
59
60 painter->setBrush( palette.brush( colorGroup, QPalette::Dark ) );
61 painter->drawPath( path2 );
62}
63
64static void qwtDrawShadedPointer( QPainter* painter,
65 const QColor& lightColor, const QColor& darkColor,
66 qreal length, qreal width )
67{
68 const qreal peak = qwtMaxF( length / 10.0, 5.0 );
69
70 const qreal knobWidth = width + 8;
71 QRectF knobRect( 0, 0, knobWidth, knobWidth );
72 knobRect.moveCenter( QPointF(0, 0) );
73
74 QPainterPath path1;
75 path1.lineTo( 0.0, 0.5 * width );
76 path1.lineTo( length - peak, 0.5 * width );
77 path1.lineTo( length, 0.0 );
78 path1.lineTo( 0.0, 0.0 );
79
80 QPainterPath arcPath1;
81 arcPath1.arcTo( knobRect, 0.0, -90.0 );
82
83 path1 = path1.united( arcPath1 );
84
85 QPainterPath path2;
86 path2.lineTo( 0.0, -0.5 * width );
87 path2.lineTo( length - peak, -0.5 * width );
88 path2.lineTo( length, 0.0 );
89 path2.lineTo( 0.0, 0.0 );
90
91 QPainterPath arcPath2;
92 arcPath2.arcTo( knobRect, 0.0, 90.0 );
93
94 path2 = path2.united( arcPath2 );
95
96 painter->setPen( Qt::NoPen );
97
98 painter->setBrush( lightColor );
99 painter->drawPath( path1 );
100
101 painter->setBrush( darkColor );
102 painter->drawPath( path2 );
103}
104
105static void qwtDrawArrowNeedle( QPainter* painter,
106 const QPalette& palette, QPalette::ColorGroup colorGroup,
107 qreal length, qreal width )
108{
109 if ( width <= 0 )
110 width = qwtMaxF( length * 0.06, 9.0 );
111
112 const qreal peak = qwtMaxF( 2.0, 0.4 * width );
113
114 QPainterPath path;
115 path.moveTo( 0.0, 0.5 * width );
116 path.lineTo( length - peak, 0.3 * width );
117 path.lineTo( length, 0.0 );
118 path.lineTo( length - peak, -0.3 * width );
119 path.lineTo( 0.0, -0.5 * width );
120
121 QRectF br = path.boundingRect();
122
123 QPalette pal( palette.color( QPalette::Mid ) );
124 QColor c1 = pal.color( QPalette::Light );
125 QColor c2 = pal.color( QPalette::Dark );
126
127 QLinearGradient gradient( br.topLeft(), br.bottomLeft() );
128 gradient.setColorAt( 0.0, c1 );
129 gradient.setColorAt( 0.5, c1 );
130 gradient.setColorAt( 0.5001, c2 );
131 gradient.setColorAt( 1.0, c2 );
132
133 QPen pen( gradient, 1 );
134 pen.setJoinStyle( Qt::MiterJoin );
135
136 painter->setPen( pen );
137 painter->setBrush( palette.brush( colorGroup, QPalette::Mid ) );
138
139 painter->drawPath( path );
140}
141
142static void qwtDrawTriangleNeedle( QPainter* painter,
143 const QPalette& palette, QPalette::ColorGroup colorGroup, qreal length )
144{
145 const qreal width = qRound( length / 3.0 );
146
147 QPainterPath path[4];
148
149 path[0].lineTo( length, 0.0 );
150 path[0].lineTo( 0.0, width / 2 );
151
152 path[1].lineTo( length, 0.0 );
153 path[1].lineTo( 0.0, -width / 2 );
154
155 path[2].lineTo( -length, 0.0 );
156 path[2].lineTo( 0.0, width / 2 );
157
158 path[3].lineTo( -length, 0.0 );
159 path[3].lineTo( 0.0, -width / 2 );
160
161
162 const int colorOffset = 10;
163 const QColor darkColor = palette.color( colorGroup, QPalette::Dark );
164 const QColor lightColor = palette.color( colorGroup, QPalette::Light );
165
166 QColor color[4];
167 color[0] = darkColor.lighter( 100 + colorOffset );
168 color[1] = darkColor.darker( 100 + colorOffset );
169 color[2] = lightColor.lighter( 100 + colorOffset );
170 color[3] = lightColor.darker( 100 + colorOffset );
171
172 painter->setPen( Qt::NoPen );
173
174 for ( int i = 0; i < 4; i++ )
175 {
176 painter->setBrush( color[i] );
177 painter->drawPath( path[i] );
178 }
179}
180
182QwtDialNeedle::QwtDialNeedle()
183 : m_palette( QApplication::palette() )
184{
185}
186
188QwtDialNeedle::~QwtDialNeedle()
189{
190}
191
197 void QwtDialNeedle::setPalette( const QPalette& palette )
198{
199 m_palette = palette;
200}
201
205 const QPalette& QwtDialNeedle::palette() const
206{
207 return m_palette;
208}
209
219 void QwtDialNeedle::draw( QPainter* painter,
220 const QPointF& center, double length, double direction,
221 QPalette::ColorGroup colorGroup ) const
222{
223 painter->save();
224
225 painter->translate( center );
226 painter->rotate( -direction );
227
228 drawNeedle( painter, length, colorGroup );
229
230 painter->restore();
231}
232
234 void QwtDialNeedle::drawKnob( QPainter* painter,
235 double width, const QBrush& brush, bool sunken ) const
236{
237 QPalette palette( brush.color() );
238
239 QColor c1 = palette.color( QPalette::Light );
240 QColor c2 = palette.color( QPalette::Dark );
241
242 if ( sunken )
243 qSwap( c1, c2 );
244
245 QRectF rect( 0.0, 0.0, width, width );
246 rect.moveCenter( painter->transform().map( QPointF() ) );
247
248 QLinearGradient gradient( rect.topLeft(), rect.bottomRight() );
249 gradient.setColorAt( 0.0, c1 );
250 gradient.setColorAt( 0.3, c1 );
251 gradient.setColorAt( 0.7, c2 );
252 gradient.setColorAt( 1.0, c2 );
253
254 painter->save();
255
256 painter->resetTransform();
257
258 painter->setPen( QPen( gradient, 1 ) );
259 painter->setBrush( brush );
260 painter->drawEllipse( rect );
261
262 painter->restore();
263}
264
273QwtDialSimpleNeedle::QwtDialSimpleNeedle( Style style, bool hasKnob,
274 const QColor& mid, const QColor& base ):
275 m_style( style ),
276 m_hasKnob( hasKnob ),
277 m_width( -1 )
278{
279 QPalette palette;
280 palette.setColor( QPalette::Mid, mid );
281 palette.setColor( QPalette::Base, base );
282
283 setPalette( palette );
284}
285
291 void QwtDialSimpleNeedle::setWidth( double width )
292{
293 m_width = width;
294}
295
300 double QwtDialSimpleNeedle::width() const
301{
302 return m_width;
303}
304
312 void QwtDialSimpleNeedle::drawNeedle( QPainter* painter,
313 double length, QPalette::ColorGroup colorGroup ) const
314{
315 qreal knobWidth = 0.0;
316 qreal width = m_width;
317
318 if ( m_style == Arrow )
319 {
320 if ( width <= 0.0 )
321 width = qwtMaxF( length * 0.06, 6.0 );
322
323 qwtDrawArrowNeedle( painter,
324 palette(), colorGroup, length, width );
325
326 knobWidth = qwtMinF( width * 2.0, 0.2 * length );
327 }
328 else
329 {
330 if ( width <= 0.0 )
331 width = 5.0;
332
333 QPen pen ( palette().brush( colorGroup, QPalette::Mid ), width );
334 pen.setCapStyle( Qt::FlatCap );
335
336 painter->setPen( pen );
337 painter->drawLine( QPointF( 0.0, 0.0 ), QPointF( length, 0.0 ) );
338
339 knobWidth = qwtMaxF( width * 3.0, 5.0 );
340 }
341
342 if ( m_hasKnob && knobWidth > 0.0 )
343 {
344 drawKnob( painter, knobWidth,
345 palette().brush( colorGroup, QPalette::Base ), false );
346 }
347}
348
350QwtCompassMagnetNeedle::QwtCompassMagnetNeedle( Style style,
351 const QColor& light, const QColor& dark ):
352 m_style( style )
353{
354 QPalette palette;
355 palette.setColor( QPalette::Light, light );
356 palette.setColor( QPalette::Dark, dark );
357 palette.setColor( QPalette::Base, Qt::gray );
358
359 setPalette( palette );
360}
361
369 void QwtCompassMagnetNeedle::drawNeedle( QPainter* painter,
370 double length, QPalette::ColorGroup colorGroup ) const
371{
372 if ( m_style == ThinStyle )
373 {
374 const qreal width = qwtMaxF( length / 6.0, 3.0 );
375
376 const int colorOffset = 10;
377
378 const QColor light = palette().color( colorGroup, QPalette::Light );
379 const QColor dark = palette().color( colorGroup, QPalette::Dark );
380
381 qwtDrawShadedPointer( painter,
382 dark.lighter( 100 + colorOffset ),
383 dark.darker( 100 + colorOffset ),
384 length, width );
385
386 painter->rotate( 180.0 );
387
388 qwtDrawShadedPointer( painter,
389 light.lighter( 100 + colorOffset ),
390 light.darker( 100 + colorOffset ),
391 length, width );
392
393 const QBrush baseBrush = palette().brush( colorGroup, QPalette::Base );
394 drawKnob( painter, width, baseBrush, true );
395 }
396 else
397 {
398 qwtDrawTriangleNeedle( painter, palette(), colorGroup, length );
399 }
400}
401
409QwtCompassWindArrow::QwtCompassWindArrow( Style style,
410 const QColor& light, const QColor& dark ):
411 m_style( style )
412{
413 QPalette palette;
414 palette.setColor( QPalette::Light, light );
415 palette.setColor( QPalette::Dark, dark );
416
417 setPalette( palette );
418}
419
427 void QwtCompassWindArrow::drawNeedle( QPainter* painter,
428 double length, QPalette::ColorGroup colorGroup ) const
429{
430 if ( m_style == Style1 )
431 qwtDrawStyle1Needle( painter, palette(), colorGroup, length );
432 else
433 qwtDrawStyle2Needle( painter, palette(), colorGroup, length );
434}
QwtCompassMagnetNeedle::QwtCompassMagnetNeedle
QwtCompassMagnetNeedle(Style=TriangleStyle, const QColor &light=Qt::white, const QColor &dark=Qt::red)
Constructor.
Definition qwt_dial_needle.cpp:350
QwtCompassMagnetNeedle::drawNeedle
virtual void drawNeedle(QPainter *, double length, QPalette::ColorGroup) const override
Definition qwt_dial_needle.cpp:369
QwtCompassMagnetNeedle::Style
Style
Style of the needle.
Definition qwt_dial_needle.h:132
QwtCompassMagnetNeedle::ThinStyle
@ ThinStyle
A thin needle.
Definition qwt_dial_needle.h:137
QwtCompassWindArrow::QwtCompassWindArrow
QwtCompassWindArrow(Style, const QColor &light=Qt::white, const QColor &dark=Qt::gray)
Definition qwt_dial_needle.cpp:409
QwtCompassWindArrow::Style
Style
Style of the arrow.
Definition qwt_dial_needle.h:169
QwtCompassWindArrow::Style1
@ Style1
A needle pointing to the center.
Definition qwt_dial_needle.h:171
QwtCompassWindArrow::drawNeedle
virtual void drawNeedle(QPainter *, double length, QPalette::ColorGroup) const override
Definition qwt_dial_needle.cpp:427
QwtDialNeedle::drawNeedle
virtual void drawNeedle(QPainter *painter, double length, QPalette::ColorGroup colorGroup) const =0
Draw the needle.
QwtDialNeedle::drawKnob
virtual void drawKnob(QPainter *, double width, const QBrush &, bool sunken) const
Draw the knob.
Definition qwt_dial_needle.cpp:234
QwtDialNeedle::draw
virtual void draw(QPainter *, const QPointF &center, double length, double direction, QPalette::ColorGroup=QPalette::Active) const
Definition qwt_dial_needle.cpp:219
QwtDialNeedle::~QwtDialNeedle
virtual ~QwtDialNeedle()
Destructor.
Definition qwt_dial_needle.cpp:188
QwtDialNeedle::palette
const QPalette & palette() const
Definition qwt_dial_needle.cpp:205
QwtDialNeedle::setPalette
virtual void setPalette(const QPalette &)
Definition qwt_dial_needle.cpp:197
QwtDialNeedle::QwtDialNeedle
QwtDialNeedle()
Constructor.
Definition qwt_dial_needle.cpp:182
QwtDialSimpleNeedle::drawNeedle
virtual void drawNeedle(QPainter *, double length, QPalette::ColorGroup) const override
Definition qwt_dial_needle.cpp:312
QwtDialSimpleNeedle::QwtDialSimpleNeedle
QwtDialSimpleNeedle(Style, bool hasKnob=true, const QColor &mid=Qt::gray, const QColor &base=Qt::darkGray)
Definition qwt_dial_needle.cpp:273
QwtDialSimpleNeedle::width
double width() const
Definition qwt_dial_needle.cpp:300
QwtDialSimpleNeedle::Style
Style
Style of the needle.
Definition qwt_dial_needle.h:86
QwtDialSimpleNeedle::Arrow
@ Arrow
Arrow.
Definition qwt_dial_needle.h:88
QwtDialSimpleNeedle::setWidth
void setWidth(double width)
Definition qwt_dial_needle.cpp:291