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<h1>qwt_knob.cpp</h1><pre class="fragment"><div>00001 <span class="comment">/* -*- mode: C++ ; c-file-style: "stroustrup" -*- *****************************</span>
00002 <span class="comment"> * Qwt Widget Library</span>
00003 <span class="comment"> * Copyright (C) 1997 Josef Wilgen</span>
00004 <span class="comment"> * Copyright (C) 2002 Uwe Rathmann</span>
00005 <span class="comment"> *</span>
00006 <span class="comment"> * This library is free software; you can redistribute it and/or</span>
00007 <span class="comment"> * modify it under the terms of the Qwt License, Version 1.0</span>
00008 <span class="comment"> *****************************************************************************/</span>
00009
00010 <span class="preprocessor">#include <qpainter.h></span>
00011 <span class="preprocessor">#include <qpalette.h></span>
00012 <span class="preprocessor">#include <qstyle.h></span>
00013 <span class="preprocessor">#include <qevent.h></span>
00014 <span class="preprocessor">#include "qwt_knob.h"</span>
00015 <span class="preprocessor">#include "<a class="code" href="qwt__math_8h.html">qwt_math.h</a>"</span>
00016 <span class="preprocessor">#include "qwt_paint_buffer.h"</span>
00017
<a name="l00023"></a><a class="code" href="class_qwt_knob.html#a0">00023</a> <a class="code" href="class_qwt_knob.html#a0">QwtKnob::QwtKnob</a>(QWidget* parent, <span class="keyword">const</span> <span class="keywordtype">char</span> *name):
00024 <a class="code" href="class_qwt_slider_base.html">QwtSliderBase</a>(Qt::Horizontal, parent, name,
00025 Qt::WRepaintNoErase|Qt::WResizeNoErase)
00026 {
00027 d_angle = 0.0;
00028 d_oldAngle = 0.0;
00029 d_nTurns = 0.0;
00030 d_borderWidth = 2;
00031 d_borderDist = 4;
00032 d_totalAngle = 270.0;
00033 d_scaleDist = 4;
00034 d_hasScale = 0;
00035 d_symbol = Line;
00036 d_maxScaleTicks = 11;
00037 d_knobWidth = 50;
00038 d_dotWidth = 8;
00039
00040 <a class="code" href="class_qwt_scale_if.html#a11">scaleDraw</a>()-><a class="code" href="class_qwt_scale_draw.html#a6">setGeometry</a>(
00041 0, 0, d_knobWidth + 2 * d_scaleDist, QwtScaleDraw::Round );
00042 <a class="code" href="class_qwt_slider_base.html#a2">setUpdateTime</a>(50);
00043 <a class="code" href="class_qwt_knob.html#a3">setTotalAngle</a>( 270.0 );
00044 recalcAngle();
00045 setSizePolicy(QSizePolicy(QSizePolicy::Minimum, QSizePolicy::Minimum));
00046 }
00047
<a name="l00049"></a><a class="code" href="class_qwt_knob.html#a1">00049</a> <a class="code" href="class_qwt_knob.html#a1">QwtKnob::~QwtKnob</a>()
00050 {
00051 }
00052
<a name="l00057"></a><a class="code" href="class_qwt_knob.html#a8">00057</a> <span class="keywordtype">void</span> <a class="code" href="class_qwt_knob.html#a8">QwtKnob::setSymbol</a>(QwtKnob::Symbol s)
00058 {
00059 <span class="keywordflow">if</span> ( d_symbol != s )
00060 {
00061 d_symbol = s;
00062 update();
00063 }
00064 }
00065
<a name="l00070"></a><a class="code" href="class_qwt_knob.html#a9">00070</a> <a class="code" href="class_qwt_knob.html#w2">QwtKnob::Symbol</a> <a class="code" href="class_qwt_knob.html#a9">QwtKnob::symbol</a>()<span class="keyword"> const</span>
00071 <span class="keyword"></span>{
00072 <span class="keywordflow">return</span> d_symbol;
00073 }
00074
<a name="l00083"></a><a class="code" href="class_qwt_knob.html#a3">00083</a> <span class="keywordtype">void</span> <a class="code" href="class_qwt_knob.html#a3">QwtKnob::setTotalAngle</a> (<span class="keywordtype">double</span> angle)
00084 {
00085 <span class="keywordflow">if</span> (angle < 10.0)
00086 d_totalAngle = 10.0;
00087 <span class="keywordflow">else</span>
00088 d_totalAngle = angle;
00089 <a class="code" href="class_qwt_scale_if.html#a11">scaleDraw</a>()-><a class="code" href="class_qwt_scale_draw.html#a11">setAngleRange</a>( -0.5 * d_totalAngle, 0.5 * d_totalAngle);
00090 layoutKnob();
00091 }
00092
00093
<a name="l00099"></a><a class="code" href="class_qwt_knob.html#b3">00099</a> <span class="keywordtype">void</span> <a class="code" href="class_qwt_knob.html#b3">QwtKnob::drawKnob</a>(QPainter *p, <span class="keyword">const</span> QRect &r)
00100 {
00101 <span class="keyword">const</span> <span class="keywordtype">int</span> bw2 = d_borderWidth / 2;
00102
00103 QRect aRect(r.x() + bw2, r.y() + bw2,
00104 r.width() - 2 * bw2, r.height() - 2 * bw2);
00105
00106 <span class="comment">//</span>
00107 <span class="comment">// draw button face</span>
00108 <span class="comment">//</span>
00109 p->setBrush(colorGroup().brush(QColorGroup::Button));
00110 p->drawEllipse(aRect);
00111
00112 <span class="comment">//</span>
00113 <span class="comment">// draw button shades</span>
00114 <span class="comment">//</span>
00115 QPen pn;
00116 pn.setWidth(d_borderWidth);
00117
00118 pn.setColor(colorGroup().light());
00119 p->setPen(pn);
00120 p->drawArc(aRect, 45*16,180*16);
00121
00122 pn.setColor(colorGroup().dark());
00123 p->setPen(pn);
00124 p->drawArc(aRect, 225*16,180*16);
00125
00126 <span class="comment">//</span>
00127 <span class="comment">// draw marker</span>
00128 <span class="comment">//</span>
00129 <span class="keywordflow">if</span> ( <a class="code" href="class_qwt_slider_base.html#a10">isValid</a>() )
00130 <a class="code" href="class_qwt_knob.html#b4">drawMarker</a>(p, d_angle, colorGroup().buttonText());
00131 }
00132
00139 <span class="keywordtype">void</span> <a class="code" href="class_qwt_slider_base.html#b1">QwtKnob::valueChange</a>()
00140 {
00141 recalcAngle();
00142 update();
00143 <a class="code" href="class_qwt_slider_base.html#b1">QwtSliderBase::valueChange</a>();
00144 }
00145
00152 <span class="keywordtype">double</span> <a class="code" href="class_qwt_slider_base.html#b8">QwtKnob::getValue</a>(<span class="keyword">const</span> QPoint &p)
00153 {
00154 <span class="keyword">const</span> <span class="keywordtype">double</span> dx = double((rect().x() + rect().width() / 2) - p.x() );
00155 <span class="keyword">const</span> <span class="keywordtype">double</span> dy = double((rect().y() + rect().height() / 2) - p.y() );
00156
00157 <span class="keyword">const</span> <span class="keywordtype">double</span> arc = atan2(-dx,dy) * 180.0 / M_PI;
00158
00159 <span class="keywordtype">double</span> newValue = 0.5 * (<a class="code" href="class_qwt_dbl_range.html#a12">minValue</a>() + <a class="code" href="class_qwt_dbl_range.html#a11">maxValue</a>())
00160 + (arc + d_nTurns * 360.0) * (<a class="code" href="class_qwt_dbl_range.html#a11">maxValue</a>() - <a class="code" href="class_qwt_dbl_range.html#a12">minValue</a>())
00161 / d_totalAngle;
00162
00163 <span class="keyword">const</span> <span class="keywordtype">double</span> oneTurn = fabs(<a class="code" href="class_qwt_dbl_range.html#a11">maxValue</a>() - <a class="code" href="class_qwt_dbl_range.html#a12">minValue</a>()) * 360.0 / d_totalAngle;
00164 <span class="keyword">const</span> <span class="keywordtype">double</span> eqValue = <a class="code" href="class_qwt_dbl_range.html#a6">value</a>() + d_mouseOffset;
00165
00166 <span class="keywordflow">if</span> (fabs(newValue - eqValue) > 0.5 * oneTurn)
00167 {
00168 <span class="keywordflow">if</span> (newValue < eqValue)
00169 newValue += oneTurn;
00170 <span class="keywordflow">else</span>
00171 newValue -= oneTurn;
00172 }
00173
00174 <span class="keywordflow">return</span> newValue;
00175 }
00176
00183 <span class="keywordtype">void</span> <a class="code" href="class_qwt_slider_base.html#b9">QwtKnob::getScrollMode</a>(<span class="keyword">const</span> QPoint &p, <span class="keywordtype">int</span> &scrollMode, <span class="keywordtype">int</span> &direction)
00184 {
00185 <span class="keyword">const</span> <span class="keywordtype">int</span> r = d_kRect.width() / 2;
00186
00187 <span class="keyword">const</span> <span class="keywordtype">int</span> dx = d_kRect.x() + r - p.x();
00188 <span class="keyword">const</span> <span class="keywordtype">int</span> dy = d_kRect.y() + r - p.y();
00189
00190 <span class="keywordflow">if</span> ( (dx * dx) + (dy * dy) <= (r * r)) <span class="comment">// point is inside the knob</span>
00191 {
00192 scrollMode = ScrMouse;
00193 direction = 0;
00194 }
00195 <span class="keywordflow">else</span> <span class="comment">// point lies outside</span>
00196 {
00197 scrollMode = ScrTimer;
00198 <span class="keywordtype">double</span> arc = atan2(<span class="keywordtype">double</span>(-dx),<span class="keywordtype">double</span>(dy)) * 180.0 / M_PI;
00199 <span class="keywordflow">if</span> ( arc < d_angle)
00200 direction = -1;
00201 <span class="keywordflow">else</span> <span class="keywordflow">if</span> (arc > d_angle)
00202 direction = 1;
00203 <span class="keywordflow">else</span>
00204 direction = 0;
00205 }
00206 }
00207
00208
00214 <span class="keywordtype">void</span> <a class="code" href="class_qwt_dbl_range.html#b5">QwtKnob::rangeChange</a>()
00215 {
00216 <span class="keywordflow">if</span> (!<a class="code" href="class_qwt_scale_if.html#b0">hasUserScale</a>())
00217 {
00218 <a class="code" href="class_qwt_scale_if.html#a11">scaleDraw</a>()-><a class="code" href="class_qwt_scale_draw.html#a2">setScale</a>(<a class="code" href="class_qwt_dbl_range.html#a12">minValue</a>(), <a class="code" href="class_qwt_dbl_range.html#a11">maxValue</a>(),
00219 <a class="code" href="class_qwt_scale_if.html#a9">scaleMaxMajor</a>(), <a class="code" href="class_qwt_scale_if.html#a8">scaleMaxMinor</a>());
00220 }
00221 layoutKnob();
00222 recalcAngle();
00223 }
00224
<a name="l00228"></a><a class="code" href="class_qwt_knob.html#b1">00228</a> <span class="keywordtype">void</span> <a class="code" href="class_qwt_knob.html#b1">QwtKnob::resizeEvent</a>(QResizeEvent *)
00229 {
00230 layoutKnob( FALSE );
00231 }
00232
00234 <span class="comment">// the current rect and fonts.</span>
00235 <span class="comment">// \param update_geometry notify the layout system and call update</span>
00236 <span class="comment">// to redraw the scale</span>
00237 <span class="keywordtype">void</span> QwtKnob::layoutKnob( <span class="keywordtype">bool</span> update_geometry )
00238 {
00239 <span class="keyword">const</span> QRect &r = rect();
00240
00241 <span class="keyword">const</span> <span class="keywordtype">int</span> width = qwtMin(qwtMin(r.height(), r.width()), d_knobWidth);
00242 <span class="keyword">const</span> <span class="keywordtype">int</span> width_2 = width / 2;
00243
00244 d_kRect.setRect(r.x() + r.width() / 2 - width_2,
00245 r.y() + r.height() / 2 - width_2,
00246 width, width);
00247
00248 <a class="code" href="class_qwt_scale_if.html#a11">scaleDraw</a>()-><a class="code" href="class_qwt_scale_draw.html#a6">setGeometry</a>(d_kRect.x() - d_scaleDist,
00249 d_kRect.y() - d_scaleDist,
00250 width + 2 * d_scaleDist, QwtScaleDraw::Round );
00251
00252 <span class="keywordflow">if</span> ( update_geometry )
00253 {
00254 updateGeometry();
00255 update();
00256 }
00257 }
00258
<a name="l00262"></a><a class="code" href="class_qwt_knob.html#b0">00262</a> <span class="keywordtype">void</span> <a class="code" href="class_qwt_knob.html#b0">QwtKnob::paintEvent</a>(QPaintEvent *e)
00263 {
00264 <span class="keyword">const</span> QRect &ur = e->rect();
00265 <span class="keywordflow">if</span> ( ur.isValid() )
00266 {
00267 <a class="code" href="class_qwt_paint_buffer.html">QwtPaintBuffer</a> paintBuffer(<span class="keyword">this</span>, ur);
00268 <a class="code" href="class_qwt_knob.html#b2">draw</a>(paintBuffer.<a class="code" href="class_qwt_paint_buffer.html#a5">painter</a>(), ur);
00269 }
00270 }
00271
<a name="l00275"></a><a class="code" href="class_qwt_knob.html#b2">00275</a> <span class="keywordtype">void</span> <a class="code" href="class_qwt_knob.html#b2">QwtKnob::draw</a>(QPainter *painter, <span class="keyword">const</span> QRect& ur)
00276 {
00277 <span class="keywordflow">if</span> ( !d_kRect.contains( ur ) ) <span class="comment">// event from valueChange()</span>
00278 <a class="code" href="class_qwt_scale_if.html#a11">scaleDraw</a>()-><a class="code" href="class_qwt_scale_draw.html#a29">draw</a>( painter );
00279 <a class="code" href="class_qwt_knob.html#b3">drawKnob</a>( painter, d_kRect );
00280
00281 <span class="keywordflow">if</span> ( hasFocus() )
00282 {
00283 QRect r = rect();
00284
00285 <span class="preprocessor">#if QT_VERSION < 300</span>
00286 <span class="preprocessor"></span> style().drawFocusRect(painter, r, colorGroup());
00287 <span class="preprocessor">#else</span>
00288 <span class="preprocessor"></span> style().drawPrimitive(QStyle::PE_FocusRect, painter,
00289 r, colorGroup());
00290 <span class="preprocessor">#endif</span>
00291 <span class="preprocessor"></span> }
00292
00293 }
00294
<a name="l00301"></a><a class="code" href="class_qwt_knob.html#b4">00301</a> <span class="keywordtype">void</span> <a class="code" href="class_qwt_knob.html#b4">QwtKnob::drawMarker</a>(QPainter *p, <span class="keywordtype">double</span> arc, <span class="keyword">const</span> QColor &c)
00302 {
00303 <span class="keyword">const</span> <span class="keywordtype">double</span> rarc = arc * M_PI / 180.0;
00304 <span class="keyword">const</span> <span class="keywordtype">double</span> ca = cos(rarc);
00305 <span class="keyword">const</span> <span class="keywordtype">double</span> sa = - sin(rarc);
00306
00307 <span class="keywordtype">int</span> radius = d_kRect.width() / 2 - d_borderWidth;
00308 <span class="keywordflow">if</span> (radius < 3)
00309 radius = 3;
00310
00311 <span class="keyword">const</span> <span class="keywordtype">int</span> ym = d_kRect.y() + radius + d_borderWidth;
00312 <span class="keyword">const</span> <span class="keywordtype">int</span> xm = d_kRect.x() + radius + d_borderWidth;
00313
00314 <span class="keywordflow">switch</span> (d_symbol)
00315 {
00316 <span class="keywordflow">case</span> Dot:
00317 {
00318 p->setBrush(c);
00319 p->setPen(Qt::NoPen);
00320
00321 <span class="keyword">const</span> <span class="keywordtype">double</span> rb = double(qwtMax(radius - 4 - d_dotWidth / 2, 0));
00322 p->drawEllipse(xm - <span class="keywordtype">int</span>(floor (sa * rb + 0.5)) - d_dotWidth / 2,
00323 ym - <span class="keywordtype">int</span>(floor (ca * rb + 0.5)) - d_dotWidth / 2,
00324 d_dotWidth, d_dotWidth);
00325 <span class="keywordflow">break</span>;
00326 }
00327 <span class="keywordflow">case</span> Line:
00328 {
00329 p->setPen(QPen(c, 2));
00330
00331 <span class="keyword">const</span> <span class="keywordtype">double</span> rb = qwtMax(<span class="keywordtype">double</span>((radius - 4) / 3.0), 0.0);
00332 <span class="keyword">const</span> <span class="keywordtype">double</span> re = qwtMax(<span class="keywordtype">double</span>(radius - 4), 0.0);
00333
00334 p->drawLine (xm - <span class="keywordtype">int</span> (floor (sa * rb + 0.5)),
00335 ym - <span class="keywordtype">int</span> (floor (ca * rb + 0.5)),
00336 xm - <span class="keywordtype">int</span> (floor (sa * re + 0.5)),
00337 ym - <span class="keywordtype">int</span> (floor (ca * re + 0.5)));
00338
00339 <span class="keywordflow">break</span>;
00340 }
00341 }
00342 }
00343
<a name="l00350"></a><a class="code" href="class_qwt_knob.html#a2">00350</a> <span class="keywordtype">void</span> <a class="code" href="class_qwt_knob.html#a2">QwtKnob::setKnobWidth</a>(<span class="keywordtype">int</span> w)
00351 {
00352 d_knobWidth = qwtMax(w,5);
00353 layoutKnob();
00354 }
00355
<a name="l00360"></a><a class="code" href="class_qwt_knob.html#a4">00360</a> <span class="keywordtype">void</span> <a class="code" href="class_qwt_knob.html#a4">QwtKnob::setBorderWidth</a>(<span class="keywordtype">int</span> bw)
00361 {
00362 d_borderWidth = qwtMax(bw, 0);
00363 layoutKnob();
00364 }
00365
00370 <span class="keywordtype">void</span> QwtKnob::recalcAngle()
00371 {
00372 d_oldAngle = d_angle;
00373
00374 <span class="comment">//</span>
00375 <span class="comment">// calculate the angle corresponding to the value</span>
00376 <span class="comment">//</span>
00377 <span class="keywordflow">if</span> (<a class="code" href="class_qwt_dbl_range.html#a11">maxValue</a>() == <a class="code" href="class_qwt_dbl_range.html#a12">minValue</a>())
00378 {
00379 d_angle = 0;
00380 d_nTurns = 0;
00381 }
00382 <span class="keywordflow">else</span>
00383 {
00384 d_angle = (<a class="code" href="class_qwt_dbl_range.html#a6">value</a>() - 0.5 * (<a class="code" href="class_qwt_dbl_range.html#a12">minValue</a>() + <a class="code" href="class_qwt_dbl_range.html#a11">maxValue</a>()))
00385 / (<a class="code" href="class_qwt_dbl_range.html#a11">maxValue</a>() - <a class="code" href="class_qwt_dbl_range.html#a12">minValue</a>()) * d_totalAngle;
00386 d_nTurns = floor((d_angle + 180.0) / 360.0);
00387 d_angle = d_angle - d_nTurns * 360.0;
00388 }
00389 }
00390
00391
00396 <span class="keywordtype">void</span> <a class="code" href="class_qwt_scale_if.html#b1">QwtKnob::scaleChange</a>()
00397 {
00398 layoutKnob();
00399 }
00400
00405 <span class="keywordtype">void</span> QwtKnob::fontChange(<span class="keyword">const</span> QFont &f)
00406 {
00407 QwtSliderBase::fontChange( f );
00408 layoutKnob();
00409 }
00410
<a name="l00414"></a><a class="code" href="class_qwt_knob.html#a10">00414</a> QSize <a class="code" href="class_qwt_knob.html#a10">QwtKnob::sizeHint</a>()<span class="keyword"> const</span>
00415 <span class="keyword"></span>{
00416 <span class="keywordflow">return</span> <a class="code" href="class_qwt_knob.html#a11">minimumSizeHint</a>();
00417 }
00418
<a name="l00424"></a><a class="code" href="class_qwt_knob.html#a11">00424</a> QSize <a class="code" href="class_qwt_knob.html#a11">QwtKnob::minimumSizeHint</a>()<span class="keyword"> const</span>
00425 <span class="keyword"></span>{
00426 <span class="comment">// Add the scale radial thickness to the knobWidth</span>
00427 <span class="keyword">const</span> <span class="keywordtype">int</span> sh = <a class="code" href="class_qwt_scale_if.html#a11">scaleDraw</a>()-><a class="code" href="class_qwt_scale_draw.html#a22">minHeight</a>( QPen(), fontMetrics() );
00428 <span class="keyword">const</span> <span class="keywordtype">int</span> d = 2 * sh + 2 * d_scaleDist + d_knobWidth;
00429
00430 <span class="keywordflow">return</span> QSize( d, d );
00431 }
00432
00433 <span class="comment">// Local Variables:</span>
00434 <span class="comment">// mode: C++</span>
00435 <span class="comment">// c-file-style: "stroustrup"</span>
00436 <span class="comment">// indent-tabs-mode: nil</span>
00437 <span class="comment">// End:</span>
</div></pre><hr size="1"><address style="align: right;"><small>Generated on Tue Nov 16 21:12:20 2004 for Qwt User's Guide by
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