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<title>Qwt User's Guide: qwt_plot_zoomer.cpp Source File</title>
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<h1>qwt_plot_zoomer.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 <math.h></span>
00013 <span class="preprocessor">#include "qwt_plot.h"</span>
00014 <span class="preprocessor">#include "qwt_plot_canvas.h"</span>
00015 <span class="preprocessor">#include "qwt_plot_zoomer.h"</span>
00016
<a name="l00040"></a><a class="code" href="class_qwt_plot_zoomer.html#a0">00040</a> <a class="code" href="class_qwt_plot_zoomer.html#a0">QwtPlotZoomer::QwtPlotZoomer</a>(<a class="code" href="class_qwt_plot_canvas.html">QwtPlotCanvas</a> *canvas, <span class="keyword">const</span> <span class="keywordtype">char</span> *name):
00041 <a class="code" href="class_qwt_plot_picker.html">QwtPlotPicker</a>(canvas, name)
00042 {
00043 <span class="keywordflow">if</span> ( canvas )
00044 init();
00045 }
00046
<a name="l00068"></a><a class="code" href="class_qwt_plot_zoomer.html#a1">00068</a> <a class="code" href="class_qwt_plot_zoomer.html#a0">QwtPlotZoomer::QwtPlotZoomer</a>(<span class="keywordtype">int</span> xAxis, <span class="keywordtype">int</span> yAxis,
00069 <a class="code" href="class_qwt_plot_canvas.html">QwtPlotCanvas</a> *canvas, <span class="keyword">const</span> <span class="keywordtype">char</span> *name):
00070 <a class="code" href="class_qwt_plot_picker.html">QwtPlotPicker</a>(xAxis, yAxis, canvas, name)
00071 {
00072 <span class="keywordflow">if</span> ( canvas )
00073 {
00074 init();
00075 }
00076 }
00077
<a name="l00102"></a><a class="code" href="class_qwt_plot_zoomer.html#a2">00102</a> <a class="code" href="class_qwt_plot_zoomer.html#a0">QwtPlotZoomer::QwtPlotZoomer</a>(<span class="keywordtype">int</span> xAxis, <span class="keywordtype">int</span> yAxis, <span class="keywordtype">int</span> selectionFlags,
00103 DisplayMode cursorLabelMode, <a class="code" href="class_qwt_plot_canvas.html">QwtPlotCanvas</a> *canvas, <span class="keyword">const</span> <span class="keywordtype">char</span> *name):
00104 <a class="code" href="class_qwt_plot_picker.html">QwtPlotPicker</a>(xAxis, yAxis,canvas, name)
00105 {
00106 <span class="keywordflow">if</span> ( canvas )
00107 {
00108 init(selectionFlags, cursorLabelMode);
00109 }
00110 }
00111
00113 <span class="keywordtype">void</span> QwtPlotZoomer::init(<span class="keywordtype">int</span> selectionFlags, DisplayMode cursorLabelMode)
00114 {
00115 d_maxStackDepth = -1;
00116
00117 <a class="code" href="class_qwt_plot_zoomer.html#a12">setSelectionFlags</a>(selectionFlags);
00118 <a class="code" href="class_qwt_picker.html#a7">setCursorLabelMode</a>(cursorLabelMode);
00119 <a class="code" href="class_qwt_picker.html#a5">setRubberBand</a>(RectRubberBand);
00120
00121 <a class="code" href="class_qwt_plot_zoomer.html#a3">setZoomBase</a>(<a class="code" href="class_qwt_plot_picker.html#b0">scaleRect</a>());
00122 }
00123
<a name="l00135"></a><a class="code" href="class_qwt_plot_zoomer.html#a8">00135</a> <span class="keywordtype">void</span> <a class="code" href="class_qwt_plot_zoomer.html#a8">QwtPlotZoomer::setMaxStackDepth</a>(<span class="keywordtype">int</span> depth)
00136 {
00137 d_maxStackDepth = depth;
00138
00139 <span class="keywordflow">if</span> ( depth >= 0 )
00140 {
00141 <span class="comment">// unzoom if the current depth is below d_maxStackDepth</span>
00142
00143 <span class="keyword">const</span> <span class="keywordtype">int</span> zoomOut =
00144 d_zoomStack.count() - 1 - depth; <span class="comment">// -1 for the zoom base</span>
00145
00146 <span class="keywordflow">if</span> ( zoomOut > 0 )
00147 {
00148 <a class="code" href="class_qwt_plot_zoomer.html#i2">zoom</a>(-zoomOut);
00149 <span class="keywordflow">for</span> ( uint i = d_zoomStack.count() - 1; i > d_zoomRectIndex; i-- )
00150 (<span class="keywordtype">void</span>)d_zoomStack.pop(); <span class="comment">// remove trailing rects</span>
00151 }
00152 }
00153 }
00154
<a name="l00159"></a><a class="code" href="class_qwt_plot_zoomer.html#a9">00159</a> <span class="keywordtype">int</span> <a class="code" href="class_qwt_plot_zoomer.html#a9">QwtPlotZoomer::maxStackDepth</a>()<span class="keyword"> const</span>
00160 <span class="keyword"></span>{
00161 <span class="keywordflow">return</span> d_maxStackDepth;
00162 }
00163
<a name="l00168"></a><a class="code" href="class_qwt_plot_zoomer.html#a10">00168</a> <span class="keyword">const</span> QValueStack<QwtDoubleRect> &<a class="code" href="class_qwt_plot_zoomer.html#a10">QwtPlotZoomer::zoomStack</a>()<span class="keyword"> const</span>
00169 <span class="keyword"></span>{
00170 <span class="keywordflow">return</span> d_zoomStack;
00171 }
00172
<a name="l00177"></a><a class="code" href="class_qwt_plot_zoomer.html#b0">00177</a> QValueStack<QwtDoubleRect> &<a class="code" href="class_qwt_plot_zoomer.html#a10">QwtPlotZoomer::zoomStack</a>()
00178 {
00179 <span class="keywordflow">return</span> d_zoomStack;
00180 }
00181
<a name="l00186"></a><a class="code" href="class_qwt_plot_zoomer.html#a5">00186</a> <a class="code" href="class_qwt_double_rect.html">QwtDoubleRect</a> <a class="code" href="class_qwt_plot_zoomer.html#a5">QwtPlotZoomer::zoomBase</a>()<span class="keyword"> const</span>
00187 <span class="keyword"></span>{
00188 <span class="keywordflow">return</span> d_zoomStack[0];
00189 }
00190
<a name="l00204"></a><a class="code" href="class_qwt_plot_zoomer.html#a3">00204</a> <span class="keywordtype">void</span> <a class="code" href="class_qwt_plot_zoomer.html#a3">QwtPlotZoomer::setZoomBase</a>()
00205 {
00206 <span class="keyword">const</span> <a class="code" href="class_qwt_plot.html">QwtPlot</a> *plt = <a class="code" href="class_qwt_plot_picker.html#a6">plot</a>();
00207 <span class="keywordflow">if</span> ( !plt )
00208 <span class="keywordflow">return</span>;
00209
00210 d_zoomStack.clear();
00211 d_zoomStack.push(<a class="code" href="class_qwt_plot_picker.html#b0">scaleRect</a>());
00212 d_zoomRectIndex = 0;
00213
00214 <a class="code" href="class_qwt_plot_zoomer.html#b1">rescale</a>();
00215 }
00216
<a name="l00227"></a><a class="code" href="class_qwt_plot_zoomer.html#a4">00227</a> <span class="keywordtype">void</span> <a class="code" href="class_qwt_plot_zoomer.html#a3">QwtPlotZoomer::setZoomBase</a>(<span class="keyword">const</span> <a class="code" href="class_qwt_double_rect.html">QwtDoubleRect</a> &base)
00228 {
00229 <span class="keyword">const</span> <a class="code" href="class_qwt_plot.html">QwtPlot</a> *plt = <a class="code" href="class_qwt_plot_picker.html#a6">plot</a>();
00230 <span class="keywordflow">if</span> ( !plt )
00231 <span class="keywordflow">return</span>;
00232
00233 <span class="keyword">const</span> <a class="code" href="class_qwt_double_rect.html">QwtDoubleRect</a> sRect = <a class="code" href="class_qwt_plot_picker.html#b0">scaleRect</a>();
00234 <span class="keyword">const</span> <a class="code" href="class_qwt_double_rect.html">QwtDoubleRect</a> bRect = base | sRect;
00235
00236 d_zoomStack.clear();
00237 d_zoomStack.push(bRect);
00238 d_zoomRectIndex = 0;
00239
00240 <span class="keywordflow">if</span> ( base != sRect )
00241 {
00242 d_zoomStack.push(sRect);
00243 d_zoomRectIndex++;
00244 }
00245
00246 <a class="code" href="class_qwt_plot_zoomer.html#b1">rescale</a>();
00247 }
00248
<a name="l00254"></a><a class="code" href="class_qwt_plot_zoomer.html#a6">00254</a> <a class="code" href="class_qwt_double_rect.html">QwtDoubleRect</a> <a class="code" href="class_qwt_plot_zoomer.html#a6">QwtPlotZoomer::zoomRect</a>()<span class="keyword"> const</span>
00255 <span class="keyword"></span>{
00256 <span class="keywordflow">return</span> d_zoomStack[d_zoomRectIndex];
00257 }
00258
<a name="l00262"></a><a class="code" href="class_qwt_plot_zoomer.html#a11">00262</a> uint <a class="code" href="class_qwt_plot_zoomer.html#a11">QwtPlotZoomer::zoomRectIndex</a>()<span class="keyword"> const</span>
00263 <span class="keyword"></span>{
00264 <span class="keywordflow">return</span> d_zoomRectIndex;
00265 }
00266
<a name="l00277"></a><a class="code" href="class_qwt_plot_zoomer.html#i2">00277</a> <span class="keywordtype">void</span> <a class="code" href="class_qwt_plot_zoomer.html#i2">QwtPlotZoomer::zoom</a>(<span class="keyword">const</span> <a class="code" href="class_qwt_double_rect.html">QwtDoubleRect</a> &rect)
00278 {
00279 <span class="keywordflow">if</span> ( d_maxStackDepth >= 0 && int(d_zoomRectIndex) >= d_maxStackDepth )
00280 <span class="keywordflow">return</span>;
00281
00282 <span class="keyword">const</span> <a class="code" href="class_qwt_double_rect.html">QwtDoubleRect</a> <a class="code" href="class_qwt_plot_zoomer.html#a6">zoomRect</a> = d_zoomStack[0] & rect.<a class="code" href="class_qwt_double_rect.html#a6">normalize</a>();
00283 <span class="keywordflow">if</span> ( zoomRect != d_zoomStack[d_zoomRectIndex] )
00284 {
00285 <span class="keywordflow">for</span> ( uint i = d_zoomStack.count() - 1; i > d_zoomRectIndex; i-- )
00286 (<span class="keywordtype">void</span>)d_zoomStack.pop();
00287
00288 d_zoomStack.push(zoomRect);
00289 d_zoomRectIndex++;
00290
00291 <a class="code" href="class_qwt_plot_zoomer.html#b1">rescale</a>();
00292 }
00293 }
00294
<a name="l00305"></a><a class="code" href="class_qwt_plot_zoomer.html#i3">00305</a> <span class="keywordtype">void</span> <a class="code" href="class_qwt_plot_zoomer.html#i2">QwtPlotZoomer::zoom</a>(<span class="keywordtype">int</span> offset)
00306 {
00307 <span class="keywordflow">if</span> ( offset == 0 )
00308 d_zoomRectIndex = 0;
00309 <span class="keywordflow">else</span>
00310 {
00311 <span class="keywordtype">int</span> newIndex = d_zoomRectIndex + offset;
00312 newIndex = QMAX(0, newIndex);
00313 newIndex = QMIN(<span class="keywordtype">int</span>(d_zoomStack.count() - 1), newIndex);
00314
00315 d_zoomRectIndex = uint(newIndex);
00316 }
00317
00318 <a class="code" href="class_qwt_plot_zoomer.html#b1">rescale</a>();
00319 }
00320
<a name="l00327"></a><a class="code" href="class_qwt_plot_zoomer.html#b1">00327</a> <span class="keywordtype">void</span> <a class="code" href="class_qwt_plot_zoomer.html#b1">QwtPlotZoomer::rescale</a>()
00328 {
00329 <a class="code" href="class_qwt_plot.html">QwtPlot</a> *plt = <a class="code" href="class_qwt_plot_picker.html#a6">plot</a>();
00330 <span class="keywordflow">if</span> ( !plt )
00331 <span class="keywordflow">return</span>;
00332
00333 <span class="keyword">const</span> <a class="code" href="class_qwt_double_rect.html">QwtDoubleRect</a> &rect = d_zoomStack[d_zoomRectIndex];
00334 <span class="keywordflow">if</span> ( rect != <a class="code" href="class_qwt_plot_picker.html#b0">scaleRect</a>() )
00335 {
00336 plt-><a class="code" href="class_qwt_plot.html#a105">setAxisScale</a>(<a class="code" href="class_qwt_plot_picker.html#a4">xAxis</a>(), rect.<a class="code" href="class_qwt_double_rect.html#a7">x1</a>(), rect.<a class="code" href="class_qwt_double_rect.html#a8">x2</a>());
00337 plt-><a class="code" href="class_qwt_plot.html#a105">setAxisScale</a>(<a class="code" href="class_qwt_plot_picker.html#a5">yAxis</a>(), rect.<a class="code" href="class_qwt_double_rect.html#a9">y1</a>(), rect.<a class="code" href="class_qwt_double_rect.html#a10">y2</a>());
00338
00339 plt-><a class="code" href="class_qwt_plot.html#i5">replot</a>();
00340 }
00341 }
00342
<a name="l00350"></a><a class="code" href="class_qwt_plot_zoomer.html#a7">00350</a> <span class="keywordtype">void</span> <a class="code" href="class_qwt_plot_zoomer.html#a7">QwtPlotZoomer::setAxis</a>(<span class="keywordtype">int</span> xAxis, <span class="keywordtype">int</span> yAxis)
00351 {
00352 <span class="keywordflow">if</span> ( xAxis != <a class="code" href="class_qwt_plot_picker.html#a4">QwtPlotPicker::xAxis</a>() || yAxis != <a class="code" href="class_qwt_plot_picker.html#a5">QwtPlotPicker::yAxis</a>() )
00353 {
00354 <a class="code" href="class_qwt_plot_picker.html#a3">QwtPlotPicker::setAxis</a>(xAxis, yAxis);
00355 <a class="code" href="class_qwt_plot_zoomer.html#a3">setZoomBase</a>(<a class="code" href="class_qwt_plot_picker.html#b0">scaleRect</a>());
00356 }
00357 }
00358
<a name="l00369"></a><a class="code" href="class_qwt_plot_zoomer.html#b3">00369</a> <span class="keywordtype">void</span> <a class="code" href="class_qwt_plot_zoomer.html#b3">QwtPlotZoomer::widgetMouseReleaseEvent</a>(QMouseEvent *me)
00370 {
00371 <span class="keywordflow">if</span> ( <a class="code" href="class_qwt_event_pattern.html#a12">mouseMatch</a>(MouseSelect2, me) )
00372 <a class="code" href="class_qwt_plot_zoomer.html#i2">zoom</a>(0);
00373 <span class="keywordflow">else</span> <span class="keywordflow">if</span> ( <a class="code" href="class_qwt_event_pattern.html#a12">mouseMatch</a>(MouseSelect3, me) )
00374 <a class="code" href="class_qwt_plot_zoomer.html#i2">zoom</a>(-1);
00375 <span class="keywordflow">else</span> <span class="keywordflow">if</span> ( <a class="code" href="class_qwt_event_pattern.html#a12">mouseMatch</a>(MouseSelect6, me) )
00376 <a class="code" href="class_qwt_plot_zoomer.html#i2">zoom</a>(+1);
00377 <span class="keywordflow">else</span>
00378 <a class="code" href="class_qwt_picker.html#b7">QwtPlotPicker::widgetMouseReleaseEvent</a>(me);
00379 }
00380
<a name="l00392"></a><a class="code" href="class_qwt_plot_zoomer.html#b4">00392</a> <span class="keywordtype">void</span> <a class="code" href="class_qwt_plot_zoomer.html#b4">QwtPlotZoomer::widgetKeyPressEvent</a>(QKeyEvent *ke)
00393 {
00394 <span class="keywordflow">if</span> ( !<a class="code" href="class_qwt_picker.html#a19">isActive</a>() )
00395 {
00396 <span class="keywordflow">if</span> ( <a class="code" href="class_qwt_event_pattern.html#a13">keyMatch</a>(KeyUndo, ke) )
00397 <a class="code" href="class_qwt_plot_zoomer.html#i2">zoom</a>(-1);
00398 <span class="keywordflow">else</span> <span class="keywordflow">if</span> ( <a class="code" href="class_qwt_event_pattern.html#a13">keyMatch</a>(KeyRedo, ke) )
00399 <a class="code" href="class_qwt_plot_zoomer.html#i2">zoom</a>(+1);
00400 <span class="keywordflow">else</span> <span class="keywordflow">if</span> ( <a class="code" href="class_qwt_event_pattern.html#a13">keyMatch</a>(KeyHome, ke) )
00401 <a class="code" href="class_qwt_plot_zoomer.html#i2">zoom</a>(0);
00402 }
00403
00404 <a class="code" href="class_qwt_picker.html#b11">QwtPlotPicker::widgetKeyPressEvent</a>(ke);
00405 }
00406
<a name="l00415"></a><a class="code" href="class_qwt_plot_zoomer.html#i0">00415</a> <span class="keywordtype">void</span> <a class="code" href="class_qwt_plot_zoomer.html#i0">QwtPlotZoomer::moveBy</a>(<span class="keywordtype">double</span> dx, <span class="keywordtype">double</span> dy)
00416 {
00417 <span class="keyword">const</span> <a class="code" href="class_qwt_double_rect.html">QwtDoubleRect</a> &rect = d_zoomStack[d_zoomRectIndex];
00418 <a class="code" href="class_qwt_plot_zoomer.html#i1">move</a>(rect.<a class="code" href="class_qwt_double_rect.html#a7">x1</a>() + dx, rect.<a class="code" href="class_qwt_double_rect.html#a9">y1</a>() + dy);
00419 }
00420
<a name="l00430"></a><a class="code" href="class_qwt_plot_zoomer.html#i1">00430</a> <span class="keywordtype">void</span> <a class="code" href="class_qwt_plot_zoomer.html#i1">QwtPlotZoomer::move</a>(<span class="keywordtype">double</span> x, <span class="keywordtype">double</span> y)
00431 {
00432 x = QMAX(x, <a class="code" href="class_qwt_plot_zoomer.html#a5">zoomBase</a>().x1());
00433 x = QMIN(x, <a class="code" href="class_qwt_plot_zoomer.html#a5">zoomBase</a>().x2() - <a class="code" href="class_qwt_plot_zoomer.html#a6">zoomRect</a>().width());
00434
00435 y = QMAX(y, <a class="code" href="class_qwt_plot_zoomer.html#a5">zoomBase</a>().y1());
00436 y = QMIN(y, <a class="code" href="class_qwt_plot_zoomer.html#a5">zoomBase</a>().y2() - <a class="code" href="class_qwt_plot_zoomer.html#a6">zoomRect</a>().height());
00437
00438 <span class="keywordflow">if</span> ( x != <a class="code" href="class_qwt_plot_zoomer.html#a6">zoomRect</a>().<a class="code" href="class_qwt_double_rect.html#a7">x1</a>() || y != <a class="code" href="class_qwt_plot_zoomer.html#a6">zoomRect</a>().<a class="code" href="class_qwt_double_rect.html#a9">y1</a>() )
00439 {
00440 d_zoomStack[d_zoomRectIndex].move(x, y);
00441 <a class="code" href="class_qwt_plot_zoomer.html#b1">rescale</a>();
00442 }
00443 }
00444
<a name="l00456"></a><a class="code" href="class_qwt_plot_zoomer.html#b7">00456</a> <span class="keywordtype">bool</span> <a class="code" href="class_qwt_plot_zoomer.html#b7">QwtPlotZoomer::accept</a>(QPointArray &pa)<span class="keyword"> const</span>
00457 <span class="keyword"></span>{
00458 <span class="keywordflow">if</span> ( pa.count() < 2 )
00459 <span class="keywordflow">return</span> FALSE;
00460
00461 QRect rect = QRect(pa[0], pa[<span class="keywordtype">int</span>(pa.count() - 1)]).normalize();
00462
00463 <span class="keyword">const</span> <span class="keywordtype">int</span> minSize = 2;
00464 <span class="keywordflow">if</span> (rect.width() < minSize && rect.height() < minSize )
00465 <span class="keywordflow">return</span> FALSE;
00466
00467 <span class="keyword">const</span> <span class="keywordtype">int</span> <a class="code" href="class_qwt_plot_zoomer.html#b2">minZoomSize</a> = 11;
00468
00469 <span class="keyword">const</span> QPoint center = rect.center();
00470 rect.setSize(rect.size().expandedTo(QSize(minZoomSize, minZoomSize)));
00471 rect.moveCenter(center);
00472
00473 pa.resize(2);
00474 pa[0] = rect.topLeft();
00475 pa[1] = rect.bottomRight();
00476
00477 <span class="keywordflow">return</span> TRUE;
00478 }
00479
<a name="l00488"></a><a class="code" href="class_qwt_plot_zoomer.html#b2">00488</a> <a class="code" href="class_qwt_double_size.html">QwtDoubleSize</a> <a class="code" href="class_qwt_plot_zoomer.html#b2">QwtPlotZoomer::minZoomSize</a>()<span class="keyword"> const</span>
00489 <span class="keyword"></span>{
00490 <span class="keywordtype">char</span> f;
00491 <span class="keywordtype">int</span> fw, xprecision, yprecision;
00492
00493 <a class="code" href="class_qwt_plot_picker.html#a6">plot</a>()-><a class="code" href="class_qwt_plot.html#a111">axisLabelFormat</a>(<a class="code" href="class_qwt_plot_picker.html#a4">xAxis</a>(), f, xprecision, fw);
00494 <a class="code" href="class_qwt_plot_picker.html#a6">plot</a>()-><a class="code" href="class_qwt_plot.html#a111">axisLabelFormat</a>(<a class="code" href="class_qwt_plot_picker.html#a5">yAxis</a>(), f, yprecision, fw);
00495
00496 <span class="keywordflow">return</span> <a class="code" href="class_qwt_double_size.html">QwtDoubleSize</a>(
00497 d_zoomStack[0].width() / pow(10.0, xprecision - 1),
00498 d_zoomStack[0].height() / pow(10.0, yprecision - 1)
00499 );
00500 }
00501
<a name="l00508"></a><a class="code" href="class_qwt_plot_zoomer.html#b5">00508</a> <span class="keywordtype">void</span> <a class="code" href="class_qwt_plot_zoomer.html#b5">QwtPlotZoomer::begin</a>()
00509 {
00510 <span class="keywordflow">if</span> ( d_maxStackDepth >= 0 )
00511 {
00512 <span class="keywordflow">if</span> ( d_zoomRectIndex >= uint(d_maxStackDepth) )
00513 <span class="keywordflow">return</span>;
00514 }
00515
00516 <span class="keyword">const</span> <a class="code" href="class_qwt_double_size.html">QwtDoubleSize</a> minSize = <a class="code" href="class_qwt_plot_zoomer.html#b2">minZoomSize</a>();
00517 <span class="keywordflow">if</span> ( minSize.<a class="code" href="class_qwt_double_size.html#a5">isValid</a>() )
00518 {
00519 <span class="keyword">const</span> <a class="code" href="class_qwt_double_size.html">QwtDoubleSize</a> sz =
00520 d_zoomStack[d_zoomRectIndex].size() * 0.9999;
00521
00522 <span class="keywordflow">if</span> ( minSize.<a class="code" href="class_qwt_double_size.html#a6">width</a>() >= sz.<a class="code" href="class_qwt_double_size.html#a6">width</a>() &&
00523 minSize.<a class="code" href="class_qwt_double_size.html#a7">height</a>() >= sz.<a class="code" href="class_qwt_double_size.html#a7">height</a>() )
00524 {
00525 <span class="keywordflow">return</span>;
00526 }
00527 }
00528
00529 <a class="code" href="class_qwt_picker.html#b2">QwtPlotPicker::begin</a>();
00530 }
00531
<a name="l00539"></a><a class="code" href="class_qwt_plot_zoomer.html#b6">00539</a> <span class="keywordtype">bool</span> <a class="code" href="class_qwt_plot_zoomer.html#b6">QwtPlotZoomer::end</a>(<span class="keywordtype">bool</span> ok)
00540 {
00541 ok = <a class="code" href="class_qwt_plot_picker.html#b9">QwtPlotPicker::end</a>(ok);
00542 <span class="keywordflow">if</span> (!ok)
00543 <span class="keywordflow">return</span> FALSE;
00544
00545 <a class="code" href="class_qwt_plot.html">QwtPlot</a> *plot = <a class="code" href="class_qwt_plot_picker.html#a6">QwtPlotZoomer::plot</a>();
00546 <span class="keywordflow">if</span> ( !plot )
00547 <span class="keywordflow">return</span> FALSE;
00548
00549 <span class="keyword">const</span> QPointArray &pa = <a class="code" href="class_qwt_picker.html#a24">selection</a>();
00550 <span class="keywordflow">if</span> ( pa.count() < 2 )
00551 <span class="keywordflow">return</span> FALSE;
00552
00553 QRect rect = QRect(pa[0], pa[<span class="keywordtype">int</span>(pa.count() - 1)]).normalize();
00554
00555 <a class="code" href="class_qwt_double_rect.html">QwtDoubleRect</a> <a class="code" href="class_qwt_plot_zoomer.html#a6">zoomRect</a> = <a class="code" href="class_qwt_plot_picker.html#b1">invTransform</a>(rect).<a class="code" href="class_qwt_double_rect.html#a6">normalize</a>();
00556
00557 <span class="keyword">const</span> <a class="code" href="class_qwt_double_point.html">QwtDoublePoint</a> center = zoomRect.<a class="code" href="class_qwt_double_rect.html#a19">center</a>();
00558 zoomRect.<a class="code" href="class_qwt_double_rect.html#a32">setSize</a>(zoomRect.<a class="code" href="class_qwt_double_rect.html#a29">size</a>().<a class="code" href="class_qwt_double_size.html#a11">expandedTo</a>(<a class="code" href="class_qwt_plot_zoomer.html#b2">minZoomSize</a>()));
00559 zoomRect.<a class="code" href="class_qwt_double_rect.html#a24">moveCenter</a>(center);
00560
00561 <a class="code" href="class_qwt_plot_zoomer.html#i2">zoom</a>(zoomRect);
00562 emit <a class="code" href="class_qwt_plot_zoomer.html#l0">zoomed</a>(zoomRect);
00563
00564 <span class="keywordflow">return</span> TRUE;
00565 }
00566
<a name="l00578"></a><a class="code" href="class_qwt_plot_zoomer.html#a12">00578</a> <span class="keywordtype">void</span> <a class="code" href="class_qwt_plot_zoomer.html#a12">QwtPlotZoomer::setSelectionFlags</a>(<span class="keywordtype">int</span> flags)
00579 {
00580 <span class="comment">// we accept only rects</span>
00581 flags &= ~(PointSelection | PolygonSelection);
00582 flags |= RectSelection;
00583
00584 <a class="code" href="class_qwt_picker.html#a3">QwtPlotPicker::setSelectionFlags</a>(flags);
00585 }
00586
00587 <span class="comment">// Local Variables:</span>
00588 <span class="comment">// mode: C++</span>
00589 <span class="comment">// c-file-style: "stroustrup"</span>
00590 <span class="comment">// indent-tabs-mode: nil</span>
00591 <span class="comment">// End:</span>
00592
</div></pre><hr size="1"><address style="align: right;"><small>Generated on Tue Nov 16 21:12:21 2004 for Qwt User's Guide by
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