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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<h1>qwt_plot_canvas.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="comment">// vim: expandtab</span>
00011
00012 <span class="preprocessor">#include <qpainter.h></span>
00013 <span class="preprocessor">#include <qstyle.h></span>
00014 <span class="preprocessor">#include <qevent.h></span>
00015 <span class="preprocessor">#include "qwt_painter.h"</span>
00016 <span class="preprocessor">#include "<a class="code" href="qwt__math_8h.html">qwt_math.h</a>"</span>
00017 <span class="preprocessor">#include "qwt_plot.h"</span>
00018 <span class="preprocessor">#include "qwt_paint_buffer.h"</span>
00019 <span class="preprocessor">#include "qwt_plot_canvas.h"</span>
00020
00021 <span class="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">int</span> dim = 5000;
00022
00024
<a name="l00025"></a><a class="code" href="class_qwt_plot_canvas.html#b0">00025</a> <a class="code" href="class_qwt_plot_canvas.html#b0">QwtPlotCanvas::QwtPlotCanvas</a>(<a class="code" href="class_qwt_plot.html">QwtPlot</a> *plot):
00026 QFrame(plot, <span class="stringliteral">"canvas"</span>, Qt::WRepaintNoErase|Qt::WResizeNoErase),
00027 d_focusIndicator(CanvasFocusIndicator),
00028 d_cacheMode(TRUE),
00029 d_cache(NULL)
00030 #ifndef QWT_NO_COMPAT
00031 ,d_outlineEnabled(FALSE),
00032 d_outlineActive(FALSE),
00033 d_mousePressed(FALSE),
00034 d_outline(Qwt::Rect),
00035 d_pen(Qt::red)
00036 #endif
00037 {
00038 setCursor(Qt::crossCursor);
00039 }
00040
<a name="l00042"></a><a class="code" href="class_qwt_plot_canvas.html#b1">00042</a> <a class="code" href="class_qwt_plot_canvas.html#b1">QwtPlotCanvas::~QwtPlotCanvas</a>()
00043 {
00044 <span class="keyword">delete</span> d_cache;
00045 }
00046
<a name="l00066"></a><a class="code" href="class_qwt_plot_canvas.html#a2">00066</a> <span class="keywordtype">void</span> <a class="code" href="class_qwt_plot_canvas.html#a2">QwtPlotCanvas::setCacheMode</a>(<span class="keywordtype">bool</span> on)
00067 {
00068 <span class="keywordflow">if</span> ( d_cacheMode != on )
00069 {
00070 d_cacheMode = on;
00071 <span class="keywordflow">if</span> (!d_cacheMode )
00072 {
00073 <span class="keyword">delete</span> d_cache;
00074 d_cache = NULL;
00075 }
00076 }
00077 }
00078
<a name="l00083"></a><a class="code" href="class_qwt_plot_canvas.html#a3">00083</a> <span class="keywordtype">bool</span> <a class="code" href="class_qwt_plot_canvas.html#a3">QwtPlotCanvas::cacheMode</a>()<span class="keyword"> const</span>
00084 <span class="keyword"></span>{
00085 <span class="keywordflow">return</span> d_cacheMode;
00086 }
00087
<a name="l00089"></a><a class="code" href="class_qwt_plot_canvas.html#b2">00089</a> QPixmap *<a class="code" href="class_qwt_plot_canvas.html#a4">QwtPlotCanvas::cache</a>()
00090 {
00091 <span class="keywordflow">return</span> d_cache;
00092 }
00093
<a name="l00095"></a><a class="code" href="class_qwt_plot_canvas.html#a4">00095</a> <span class="keyword">const</span> QPixmap *<a class="code" href="class_qwt_plot_canvas.html#a4">QwtPlotCanvas::cache</a>()<span class="keyword"> const</span>
00096 <span class="keyword"></span>{
00097 <span class="keywordflow">return</span> d_cache;
00098 }
00099
<a name="l00101"></a><a class="code" href="class_qwt_plot_canvas.html#a5">00101</a> <span class="keywordtype">void</span> <a class="code" href="class_qwt_plot_canvas.html#a5">QwtPlotCanvas::invalidateCache</a>()
00102 {
00103 <span class="keywordflow">if</span> ( d_cache )
00104 d_cache->resize(0, 0);
00105 }
00106
<a name="l00112"></a><a class="code" href="class_qwt_plot_canvas.html#a0">00112</a> <span class="keywordtype">void</span> <a class="code" href="class_qwt_plot_canvas.html#a0">QwtPlotCanvas::setFocusIndicator</a>(FocusIndicator focusIndicator)
00113 {
00114 d_focusIndicator = focusIndicator;
00115 }
00116
<a name="l00122"></a><a class="code" href="class_qwt_plot_canvas.html#a1">00122</a> <a class="code" href="class_qwt_plot_canvas.html#w3">QwtPlotCanvas::FocusIndicator</a> <a class="code" href="class_qwt_plot_canvas.html#a1">QwtPlotCanvas::focusIndicator</a>()<span class="keyword"> const</span>
00123 <span class="keyword"></span>{
00124 <span class="keywordflow">return</span> d_focusIndicator;
00125 }
00126
<a name="l00128"></a><a class="code" href="class_qwt_plot_canvas.html#b3">00128</a> <span class="keywordtype">void</span> <a class="code" href="class_qwt_plot_canvas.html#b3">QwtPlotCanvas::frameChanged</a>()
00129 {
00130 QFrame::frameChanged();
00131
00132 <span class="comment">// frame changes change the size of the contents rect, what</span>
00133 <span class="comment">// is related to the axes. So we have to update the layout.</span>
00134
00135 ((<a class="code" href="class_qwt_plot.html">QwtPlot</a> *)parent())->updateLayout();
00136 }
00137
<a name="l00139"></a><a class="code" href="class_qwt_plot_canvas.html#b4">00139</a> <span class="keywordtype">void</span> <a class="code" href="class_qwt_plot_canvas.html#b4">QwtPlotCanvas::drawContents</a>(QPainter *painter)
00140 {
00141 <span class="keywordflow">if</span> ( <a class="code" href="class_qwt_plot_canvas.html#a3">cacheMode</a>() && d_cache
00142 && d_cache->size() == contentsRect().size() )
00143 {
00144 painter->drawPixmap(contentsRect().topLeft(), *d_cache);
00145 }
00146 <span class="keywordflow">else</span>
00147 <a class="code" href="class_qwt_plot_canvas.html#b6">drawCanvas</a>(painter);
00148
00149 <span class="preprocessor">#ifndef QWT_NO_COMPAT</span>
00150 <span class="preprocessor"></span> <span class="keywordflow">if</span> ( d_outlineActive )
00151 drawOutline(*painter); <span class="comment">// redraw outline</span>
00152 <span class="preprocessor">#endif</span>
00153 <span class="preprocessor"></span>
00154 <span class="keywordflow">if</span> ( hasFocus() && <a class="code" href="class_qwt_plot_canvas.html#a1">focusIndicator</a>() == CanvasFocusIndicator )
00155 {
00156 <span class="keyword">const</span> <span class="keywordtype">int</span> margin = 1;
00157 QRect focusRect = contentsRect();
00158 focusRect.setRect(focusRect.x() + margin, focusRect.y() + margin,
00159 focusRect.width() - 2 * margin, focusRect.height() - 2 * margin);
00160
00161 <a class="code" href="class_qwt_plot_canvas.html#b5">drawFocusIndicator</a>(painter, focusRect);
00162 }
00163 }
00164
<a name="l00174"></a><a class="code" href="class_qwt_plot_canvas.html#b6">00174</a> <span class="keywordtype">void</span> <a class="code" href="class_qwt_plot_canvas.html#b6">QwtPlotCanvas::drawCanvas</a>(QPainter *painter)
00175 {
00176 <span class="keywordflow">if</span> ( !contentsRect().isValid() )
00177 <span class="keywordflow">return</span>;
00178
00179 QRect clipRect = contentsRect();
00180 <span class="keywordflow">if</span> ( !<a class="code" href="class_qwt_plot_canvas.html#a3">cacheMode</a>() || !<a class="code" href="class_qwt_paint_buffer.html#e1">QwtPaintBuffer::isEnabled</a>() )
00181 {
00182 <span class="comment">// If we dont need the paint buffer as cache we can</span>
00183 <span class="comment">// use the clip for painting to the buffer too. </span>
00184
00185 <span class="keywordflow">if</span> ( painter && !painter->clipRegion().isNull() )
00186 clipRect = painter->clipRegion().boundingRect();
00187 }
00188
00189 <a class="code" href="class_qwt_paint_buffer.html">QwtPaintBuffer</a> paintBuffer(<span class="keyword">this</span>, clipRect, painter);
00190 ((<a class="code" href="class_qwt_plot.html">QwtPlot</a> *)parent())->drawCanvas(paintBuffer.<a class="code" href="class_qwt_paint_buffer.html#a5">painter</a>());
00191
00192 <span class="keywordflow">if</span> ( <a class="code" href="class_qwt_plot_canvas.html#a3">cacheMode</a>() )
00193 {
00194 <span class="keywordflow">if</span> ( d_cache == NULL )
00195 {
00196 d_cache = <span class="keyword">new</span> QPixmap(contentsRect().size());
00197 <span class="preprocessor">#if QT_VERSION >= 300</span>
00198 <span class="preprocessor"></span><span class="preprocessor">#ifdef Q_WS_X11</span>
00199 <span class="preprocessor"></span> <span class="keywordflow">if</span> ( d_cache->x11Screen() != x11Screen() )
00200 d_cache->x11SetScreen(x11Screen());
00201 <span class="preprocessor">#endif</span>
00202 <span class="preprocessor"></span><span class="preprocessor">#endif</span>
00203 <span class="preprocessor"></span> }
00204 <span class="keywordflow">else</span>
00205 d_cache->resize(contentsRect().size());
00206
00207 <span class="keywordflow">if</span> ( <a class="code" href="class_qwt_paint_buffer.html#e1">QwtPaintBuffer::isEnabled</a>() )
00208 *d_cache = paintBuffer.<a class="code" href="class_qwt_paint_buffer.html#a7">buffer</a>();
00209 <span class="keywordflow">else</span>
00210 {
00211 d_cache->fill(<span class="keyword">this</span>, 0, 0);
00212 QPainter cachePainter(d_cache);
00213 cachePainter.translate(-contentsRect().x(),
00214 -contentsRect().y());
00215 ((<a class="code" href="class_qwt_plot.html">QwtPlot</a> *)parent())->drawCanvas(&cachePainter);
00216 }
00217 }
00218 }
00219
<a name="l00221"></a><a class="code" href="class_qwt_plot_canvas.html#b5">00221</a> <span class="keywordtype">void</span> <a class="code" href="class_qwt_plot_canvas.html#b5">QwtPlotCanvas::drawFocusIndicator</a>(QPainter *painter, <span class="keyword">const</span> QRect &rect)
00222 {
00223 <span class="preprocessor">#if QT_VERSION < 300</span>
00224 <span class="preprocessor"></span> style().drawFocusRect(painter, rect, colorGroup());
00225 <span class="preprocessor">#else</span>
00226 <span class="preprocessor"></span> style().drawPrimitive(QStyle::PE_FocusRect, painter,
00227 rect, colorGroup());
00228 <span class="preprocessor">#endif</span>
00229 <span class="preprocessor"></span>}
00230
00231 <span class="preprocessor">#ifndef QWT_NO_COMPAT</span>
00232 <span class="preprocessor"></span>
<a name="l00234"></a><a class="code" href="class_qwt_plot_canvas.html#b7">00234</a> <span class="keywordtype">void</span> <a class="code" href="class_qwt_plot_canvas.html#b7">QwtPlotCanvas::mousePressEvent</a>(QMouseEvent *e)
00235 {
00236 <span class="keywordflow">if</span> (d_outlineActive)
00237 {
00238 QPainter p(<span class="keyword">this</span>);
00239 drawOutline(p); <span class="comment">// Delete active outlines</span>
00240 }
00241
00242 d_outlineActive = FALSE;
00243
00244 <span class="comment">//</span>
00245 <span class="comment">// store this point as entry point</span>
00246 <span class="comment">//</span>
00247 d_lastPoint = e->pos();
00248 d_entryPoint = e->pos();
00249
00250 <span class="keywordflow">if</span> (d_outlineEnabled)
00251 {
00252 QPainter p(<span class="keyword">this</span>);
00253 drawOutline(p); <span class="comment">// draw new outline</span>
00254 d_outlineActive = TRUE;
00255 }
00256
00257 d_mousePressed = TRUE;
00258
00259 QMouseEvent m(QEvent::MouseButtonPress,
00260 e->pos() - rect().topLeft(), e->button(), e->state());
00261
00262 emit <a class="code" href="class_qwt_plot_canvas.html#l0">mousePressed</a>(m);
00263 }
00264
<a name="l00266"></a><a class="code" href="class_qwt_plot_canvas.html#b8">00266</a> <span class="keywordtype">void</span> <a class="code" href="class_qwt_plot_canvas.html#b8">QwtPlotCanvas::mouseReleaseEvent</a>(QMouseEvent *e)
00267 {
00268 <span class="keywordflow">if</span> (d_outlineActive)
00269 {
00270 QPainter p(<span class="keyword">this</span>);
00271 drawOutline(p);
00272 }
00273
00274 d_outlineActive = FALSE;
00275 d_mousePressed = FALSE;
00276
00277 QMouseEvent m(QEvent::MouseButtonRelease,
00278 e->pos() - rect().topLeft(), e->button(), e->state());
00279
00280 emit <a class="code" href="class_qwt_plot_canvas.html#l1">mouseReleased</a>(m);
00281 }
00282
<a name="l00284"></a><a class="code" href="class_qwt_plot_canvas.html#b9">00284</a> <span class="keywordtype">void</span> <a class="code" href="class_qwt_plot_canvas.html#b9">QwtPlotCanvas::mouseMoveEvent</a>(QMouseEvent *e)
00285 {
00286 <span class="keywordflow">if</span> (d_outlineActive)
00287 {
00288 QPainter p(<span class="keyword">this</span>);
00289 drawOutline(p);
00290 d_lastPoint = e->pos();
00291 drawOutline(p);
00292 }
00293
00294 QMouseEvent m(QEvent::MouseMove,
00295 e->pos() - rect().topLeft(), e->button(), e->state());
00296
00297 emit <a class="code" href="class_qwt_plot_canvas.html#l2">mouseMoved</a>(m);
00298 }
00299
<a name="l00315"></a><a class="code" href="class_qwt_plot_canvas.html#a6">00315</a> <span class="keywordtype">void</span> <a class="code" href="class_qwt_plot_canvas.html#a6">QwtPlotCanvas::enableOutline</a>(<span class="keywordtype">bool</span> tf)
00316 {
00317
00318 <span class="comment">//</span>
00319 <span class="comment">// If the mouse is pressed, erase existing outline</span>
00320 <span class="comment">// or draw new outline if 'tf' changes the 'enabled' state.</span>
00321 <span class="comment">//</span>
00322 <span class="keywordflow">if</span> ((tf != d_outlineEnabled) && d_mousePressed)
00323 {
00324 QPainter p(<span class="keyword">this</span>);
00325 drawOutline(p);
00326 d_outlineActive = tf;
00327 }
00328 d_outlineEnabled = tf;
00329 }
00330
<a name="l00340"></a><a class="code" href="class_qwt_plot_canvas.html#a7">00340</a> <span class="keywordtype">bool</span> <a class="code" href="class_qwt_plot_canvas.html#a7">QwtPlotCanvas::outlineEnabled</a>()<span class="keyword"> const </span>
00341 <span class="keyword"></span>{
00342 <span class="keywordflow">return</span> d_outlineEnabled;
00343 }
00344
<a name="l00379"></a><a class="code" href="class_qwt_plot_canvas.html#a10">00379</a> <span class="keywordtype">void</span> <a class="code" href="class_qwt_plot_canvas.html#a10">QwtPlotCanvas::setOutlineStyle</a>(Qwt::Shape os)
00380 {
00381 <span class="keywordflow">if</span> (d_outlineActive)
00382 {
00383 QPainter p(<span class="keyword">this</span>); <span class="comment">// erase old outline</span>
00384 drawOutline(p);
00385 }
00386
00387 d_outline = os;
00388
00389 <span class="keywordflow">if</span> (d_outlineActive)
00390 {
00391 QPainter p(<span class="keyword">this</span>);
00392 drawOutline(p); <span class="comment">// draw new outline</span>
00393 }
00394 }
00395
<a name="l00404"></a><a class="code" href="class_qwt_plot_canvas.html#a11">00404</a> Qwt::Shape <a class="code" href="class_qwt_plot_canvas.html#a11">QwtPlotCanvas::outlineStyle</a>()<span class="keyword"> const </span>
00405 <span class="keyword"></span>{
00406 <span class="keywordflow">return</span> d_outline;
00407 }
00408
<a name="l00419"></a><a class="code" href="class_qwt_plot_canvas.html#a8">00419</a> <span class="keywordtype">void</span> <a class="code" href="class_qwt_plot_canvas.html#a8">QwtPlotCanvas::setOutlinePen</a>(<span class="keyword">const</span> QPen &pen)
00420 {
00421 d_pen = pen;
00422 }
00423
<a name="l00433"></a><a class="code" href="class_qwt_plot_canvas.html#a9">00433</a> <span class="keyword">const</span> QPen& <a class="code" href="class_qwt_plot_canvas.html#a9">QwtPlotCanvas::outlinePen</a>()<span class="keyword"> const </span>
00434 <span class="keyword"></span>{
00435 <span class="keywordflow">return</span> d_pen;
00436 }
00437
00444 <span class="keywordtype">void</span> QwtPlotCanvas::drawOutline(QPainter &p)
00445 {
00446 <span class="keyword">const</span> QRect &r = contentsRect();
00447
00448 QColor bg = ((<a class="code" href="class_qwt_plot.html">QwtPlot</a> *)parent())->canvasBackground();
00449
00450 QPen pn = d_pen;
00451 pn.setColor(QColor(bg.rgb() ^ d_pen.color().rgb()));
00452
00453 p.setPen(pn);
00454 p.setRasterOp(XorROP);
00455 p.setClipRect(r);
00456 p.setClipping(TRUE);
00457
00458 <span class="keywordflow">switch</span>(d_outline)
00459 {
00460 <span class="keywordflow">case</span> Qwt::VLine:
00461 <a class="code" href="class_qwt_painter.html#e16">QwtPainter::drawLine</a>(&p, d_lastPoint.x(),
00462 r.top(), d_lastPoint.x(), r.bottom());
00463 <span class="keywordflow">break</span>;
00464
00465 <span class="keywordflow">case</span> Qwt::HLine:
00466 <a class="code" href="class_qwt_painter.html#e16">QwtPainter::drawLine</a>(&p, r.left(),
00467 d_lastPoint.y(), r.right(), d_lastPoint.y());
00468 <span class="keywordflow">break</span>;
00469
00470 <span class="keywordflow">case</span> Qwt::Cross:
00471 <a class="code" href="class_qwt_painter.html#e16">QwtPainter::drawLine</a>(&p, r.left(),
00472 d_lastPoint.y(), r.right(), d_lastPoint.y());
00473 <a class="code" href="class_qwt_painter.html#e16">QwtPainter::drawLine</a>(&p, d_lastPoint.x(),
00474 r.top(), d_lastPoint.x(), r.bottom());
00475 <span class="keywordflow">break</span>;
00476
00477 <span class="keywordflow">case</span> Qwt::Rect:
00478 <a class="code" href="class_qwt_painter.html#e12">QwtPainter::drawRect</a>(&p, d_entryPoint.x(), d_entryPoint.y(),
00479 d_lastPoint.x() - d_entryPoint.x() + 1,
00480 d_lastPoint.y() - d_entryPoint.y() + 1);
00481 <span class="keywordflow">break</span>;
00482
00483 <span class="keywordflow">case</span> Qwt::Ellipse:
00484 p.drawEllipse(d_entryPoint.x(), d_entryPoint.y(),
00485 d_lastPoint.x() - d_entryPoint.x() + 1,
00486 d_lastPoint.y() - d_entryPoint.y() + 1);
00487 <span class="keywordflow">break</span>;
00488
00489 <span class="keywordflow">default</span>:
00490 <span class="keywordflow">break</span>;
00491 }
00492 }
00493
00494 <span class="preprocessor">#endif // !QWT_NO_COMPAT</span>
00495 <span class="preprocessor"></span>
00496 <span class="comment">// Local Variables:</span>
00497 <span class="comment">// mode: C++</span>
00498 <span class="comment">// c-file-style: "stroustrup"</span>
00499 <span class="comment">// indent-tabs-mode: nil</span>
00500 <span class="comment">// End:</span>
00501
</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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<img src="doxygen.png" alt="doxygen" align="middle" border=0 ></a> 1.3.8 </small></address>
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