qwt__double__range_8cpp-source.html

QWT5.01用于Qt开发的二维图形库程序

<a name="l00174"></a>00174     {
<a name="l00175"></a>00175         d_minValue = vmin;
<a name="l00176"></a>00176         d_maxValue = vmax;
<a name="l00177"></a>00177     }
<a name="l00178"></a>00178     
<a name="l00179"></a>00179     <span class="comment">//</span>
<a name="l00180"></a>00180     <span class="comment">// look if the step width has an acceptable </span>
<a name="l00181"></a>00181     <span class="comment">// value or otherwise change it.</span>
<a name="l00182"></a>00182     <span class="comment">//</span>
<a name="l00183"></a>00183     <a class="code" href="class_qwt_double_range.html#29ed5fc66439def424a8ad773eea285d">setStep</a>(vstep);
<a name="l00184"></a>00184 
<a name="l00185"></a>00185     <span class="comment">//</span>
<a name="l00186"></a>00186     <span class="comment">// limit page size</span>
<a name="l00187"></a>00187     <span class="comment">//</span>
<a name="l00188"></a>00188     d_pageSize = qwtLim(pageSize,0, 
<a name="l00189"></a>00189         <span class="keywordtype">int</span>(qwtAbs((d_maxValue - d_minValue) / d_step))); 
<a name="l00190"></a>00190     
<a name="l00191"></a>00191     <span class="comment">// </span>
<a name="l00192"></a>00192     <span class="comment">// If the value lies out of the range, it </span>
<a name="l00193"></a>00193     <span class="comment">// will be changed. Note that it will not be adjusted to </span>
<a name="l00194"></a>00194     <span class="comment">// the new step width.</span>
<a name="l00195"></a>00195     setNewValue(d_value, <span class="keyword">false</span>);
<a name="l00196"></a>00196     
<a name="l00197"></a>00197     <span class="comment">// call notifier after the step width has been </span>
<a name="l00198"></a>00198     <span class="comment">// adjusted.</span>
<a name="l00199"></a>00199     <span class="keywordflow">if</span> (rchg)
<a name="l00200"></a>00200        <a class="code" href="class_qwt_double_range.html#3583134a1ac32706aa4742088bb9d4dc">rangeChange</a>();
<a name="l00201"></a>00201 }
<a name="l00202"></a>00202 
<a name="l00208"></a><a class="code" href="class_qwt_double_range.html#29ed5fc66439def424a8ad773eea285d">00208</a> <span class="keywordtype">void</span> <a class="code" href="class_qwt_double_range.html#29ed5fc66439def424a8ad773eea285d">QwtDoubleRange::setStep</a>(<span class="keywordtype">double</span> vstep)
<a name="l00209"></a>00209 {
<a name="l00210"></a>00210     <span class="keywordtype">double</span> intv = d_maxValue - d_minValue;
<a name="l00211"></a>00211     
<a name="l00212"></a>00212     <span class="keywordtype">double</span> newStep;
<a name="l00213"></a>00213     <span class="keywordflow">if</span> (vstep == 0.0)
<a name="l00214"></a>00214        newStep = intv * DefaultRelStep;
<a name="l00215"></a>00215     <span class="keywordflow">else</span>
<a name="l00216"></a>00216     {
<a name="l00217"></a>00217         <span class="keywordflow">if</span> ((intv &gt; 0) &amp;&amp; (vstep &lt; 0) || (intv &lt; 0) &amp;&amp; (vstep &gt; 0))
<a name="l00218"></a>00218            newStep = -vstep;
<a name="l00219"></a>00219         <span class="keywordflow">else</span>
<a name="l00220"></a>00220            newStep = vstep;
<a name="l00221"></a>00221         
<a name="l00222"></a>00222         <span class="keywordflow">if</span> ( fabs(newStep) &lt; fabs(MinRelStep * intv) )
<a name="l00223"></a>00223            newStep = MinRelStep * intv;
<a name="l00224"></a>00224     }
<a name="l00225"></a>00225     
<a name="l00226"></a>00226     <span class="keywordflow">if</span> (newStep != d_step)
<a name="l00227"></a>00227     {
<a name="l00228"></a>00228         d_step = newStep;
<a name="l00229"></a>00229         <a class="code" href="class_qwt_double_range.html#86641f8755ed172ca4cf72d36df539ca">stepChange</a>();
<a name="l00230"></a>00230     }
<a name="l00231"></a>00231 }
<a name="l00232"></a>00232 
<a name="l00233"></a>00233 
<a name="l00248"></a><a class="code" href="class_qwt_double_range.html#95fa6a4e44fc47726d939155bb6f6f1f">00248</a> <span class="keywordtype">void</span> <a class="code" href="class_qwt_double_range.html#95fa6a4e44fc47726d939155bb6f6f1f">QwtDoubleRange::setPeriodic</a>(<span class="keywordtype">bool</span> tf)
<a name="l00249"></a>00249 {
<a name="l00250"></a>00250     d_periodic = tf;
<a name="l00251"></a>00251 }
<a name="l00252"></a>00252 
<a name="l00259"></a><a class="code" href="class_qwt_double_range.html#299c35c72e9b69f5a0e3dcd2b7da775b">00259</a> <span class="keywordtype">void</span> <a class="code" href="class_qwt_double_range.html#299c35c72e9b69f5a0e3dcd2b7da775b">QwtDoubleRange::incValue</a>(<span class="keywordtype">int</span> nSteps)
<a name="l00260"></a>00260 {
<a name="l00261"></a>00261     <span class="keywordflow">if</span> ( <a class="code" href="class_qwt_double_range.html#fc4921deb3f68a64cc08b0654a040bc6">isValid</a>() )
<a name="l00262"></a>00262         setNewValue(d_value + <span class="keywordtype">double</span>(nSteps) * d_step, <span class="keyword">true</span>);
<a name="l00263"></a>00263 }
<a name="l00264"></a>00264 
<a name="l00271"></a><a class="code" href="class_qwt_double_range.html#19b85337d4ab0b5f0579b02e4fb29a8f">00271</a> <span class="keywordtype">void</span> <a class="code" href="class_qwt_double_range.html#19b85337d4ab0b5f0579b02e4fb29a8f">QwtDoubleRange::incPages</a>(<span class="keywordtype">int</span> nPages)
<a name="l00272"></a>00272 {
<a name="l00273"></a>00273     <span class="keywordflow">if</span> ( <a class="code" href="class_qwt_double_range.html#fc4921deb3f68a64cc08b0654a040bc6">isValid</a>() )
<a name="l00274"></a>00274         setNewValue(d_value + <span class="keywordtype">double</span>(nPages) * <span class="keywordtype">double</span>(d_pageSize) * d_step, <span class="keyword">true</span>);
<a name="l00275"></a>00275 }
<a name="l00276"></a>00276 
<a name="l00283"></a><a class="code" href="class_qwt_double_range.html#1d50398342d6aa1d9cd86650ee29aff8">00283</a> <span class="keywordtype">void</span> <a class="code" href="class_qwt_double_range.html#1d50398342d6aa1d9cd86650ee29aff8">QwtDoubleRange::valueChange</a>()
<a name="l00284"></a>00284 {
<a name="l00285"></a>00285 }
<a name="l00286"></a>00286 
<a name="l00287"></a>00287 
<a name="l00294"></a><a class="code" href="class_qwt_double_range.html#3583134a1ac32706aa4742088bb9d4dc">00294</a> <span class="keywordtype">void</span> <a class="code" href="class_qwt_double_range.html#3583134a1ac32706aa4742088bb9d4dc">QwtDoubleRange::rangeChange</a>()
<a name="l00295"></a>00295 {
<a name="l00296"></a>00296 }
<a name="l00297"></a>00297 
<a name="l00298"></a>00298 
<a name="l00305"></a><a class="code" href="class_qwt_double_range.html#86641f8755ed172ca4cf72d36df539ca">00305</a> <span class="keywordtype">void</span> <a class="code" href="class_qwt_double_range.html#86641f8755ed172ca4cf72d36df539ca">QwtDoubleRange::stepChange</a>()
<a name="l00306"></a>00306 {
<a name="l00307"></a>00307 }
<a name="l00308"></a>00308 
<a name="l00313"></a><a class="code" href="class_qwt_double_range.html#0cb8cc60548c10cb1d98e54387961967">00313</a> <span class="keywordtype">double</span> <a class="code" href="class_qwt_double_range.html#0cb8cc60548c10cb1d98e54387961967">QwtDoubleRange::step</a>()<span class="keyword"> const</span>
<a name="l00314"></a>00314 <span class="keyword"></span>{
<a name="l00315"></a>00315     <span class="keywordflow">return</span> qwtAbs(d_step);
<a name="l00316"></a>00316 }
<a name="l00317"></a>00317 
<a name="l00326"></a><a class="code" href="class_qwt_double_range.html#215275a1a8b4218a424ee8444c7fe409">00326</a> <span class="keywordtype">double</span> <a class="code" href="class_qwt_double_range.html#215275a1a8b4218a424ee8444c7fe409">QwtDoubleRange::maxValue</a>()<span class="keyword"> const</span>
<a name="l00327"></a>00327 <span class="keyword"></span>{   
<a name="l00328"></a>00328     <span class="keywordflow">return</span> d_maxValue;
<a name="l00329"></a>00329 } 
<a name="l00330"></a>00330     
<a name="l00339"></a><a class="code" href="class_qwt_double_range.html#8b8650a6f8a96144d3af21207ee71637">00339</a> <span class="keywordtype">double</span> <a class="code" href="class_qwt_double_range.html#8b8650a6f8a96144d3af21207ee71637">QwtDoubleRange::minValue</a>()<span class="keyword"> const </span>
<a name="l00340"></a>00340 <span class="keyword"></span>{
<a name="l00341"></a>00341     <span class="keywordflow">return</span> d_minValue; 
<a name="l00342"></a>00342 }   
<a name="l00343"></a>00343 
<a name="l00348"></a><a class="code" href="class_qwt_double_range.html#d1efbcbf29dbc74f3f378292b76b007b">00348</a> <span class="keywordtype">bool</span> <a class="code" href="class_qwt_double_range.html#d1efbcbf29dbc74f3f378292b76b007b">QwtDoubleRange::periodic</a>()<span class="keyword"> const </span>
<a name="l00349"></a>00349 <span class="keyword"></span>{ 
<a name="l00350"></a>00350     <span class="keywordflow">return</span> d_periodic; 
<a name="l00351"></a>00351 }
<a name="l00352"></a>00352 
<a name="l00354"></a><a class="code" href="class_qwt_double_range.html#c12a5c43dc5839913379982ec40a39d8">00354</a> <span class="keywordtype">int</span> <a class="code" href="class_qwt_double_range.html#c12a5c43dc5839913379982ec40a39d8">QwtDoubleRange::pageSize</a>()<span class="keyword"> const </span>
<a name="l00355"></a>00355 <span class="keyword"></span>{ 
<a name="l00356"></a>00356     <span class="keywordflow">return</span> d_pageSize; 
<a name="l00357"></a>00357 }
<a name="l00358"></a>00358 
<a name="l00360"></a><a class="code" href="class_qwt_double_range.html#7777cf257c812579c4891512f1b6cad0">00360</a> <span class="keywordtype">double</span> <a class="code" href="class_qwt_double_range.html#7777cf257c812579c4891512f1b6cad0">QwtDoubleRange::value</a>()<span class="keyword"> const </span>
<a name="l00361"></a>00361 <span class="keyword"></span>{ 
<a name="l00362"></a>00362     <span class="keywordflow">return</span> d_value; 
<a name="l00363"></a>00363 }
<a name="l00364"></a>00364 
<a name="l00374"></a><a class="code" href="class_qwt_double_range.html#705b76d28882d37bc5313d6c38c9a720">00374</a> <span class="keywordtype">double</span> <a class="code" href="class_qwt_double_range.html#705b76d28882d37bc5313d6c38c9a720">QwtDoubleRange::exactValue</a>()<span class="keyword"> const </span>
<a name="l00375"></a>00375 <span class="keyword"></span>{ 
<a name="l00376"></a>00376     <span class="keywordflow">return</span> d_exactValue; 
<a name="l00377"></a>00377 }
<a name="l00378"></a>00378 
<a name="l00380"></a><a class="code" href="class_qwt_double_range.html#595c04ed863eb7f0adaf94440087fe0a">00380</a> <span class="keywordtype">double</span> <a class="code" href="class_qwt_double_range.html#595c04ed863eb7f0adaf94440087fe0a">QwtDoubleRange::exactPrevValue</a>()<span class="keyword"> const </span>
<a name="l00381"></a>00381 <span class="keyword"></span>{ 
<a name="l00382"></a>00382     <span class="keywordflow">return</span> d_exactPrevValue; 
<a name="l00383"></a>00383 }
<a name="l00384"></a>00384 
<a name="l00386"></a><a class="code" href="class_qwt_double_range.html#38768187bef94dd5e5a2c8664746b365">00386</a> <span class="keywordtype">double</span> <a class="code" href="class_qwt_double_range.html#38768187bef94dd5e5a2c8664746b365">QwtDoubleRange::prevValue</a>()<span class="keyword"> const </span>
<a name="l00387"></a>00387 <span class="keyword"></span>{ 
<a name="l00388"></a>00388     <span class="keywordflow">return</span> d_prevValue; 
<a name="l00389"></a>00389 }
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