class_qwt_plot_zoomer.html

QWT5.01用于Qt开发的二维图形库程序

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Zoom in or out. 
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Activate a rectangle on the zoom stack with an offset relative to the current position. Negative values of offest will zoom out, positive zoom in. A value of 0 zooms out to the zoom base.<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
  <table border="0" cellspacing="2" cellpadding="0">
    <tr><td valign="top"></td><td valign="top"><em>offset</em>&nbsp;</td><td>Offset relative to the current position of the zoom stack. </td></tr>
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<dl compact><dt><b>Note:</b></dt><dd>The zoomed signal is emitted. </dd></dl>
<dl compact><dt><b>See also:</b></dt><dd><a class="el" href="class_qwt_plot_zoomer.html#63797aa3b9e540a2c5f539fa34a05fbc">zoomRectIndex()</a> </dd></dl>

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Definition at line <a class="el" href="qwt__plot__zoomer_8cpp-source.html#l00319">319</a> of file <a class="el" href="qwt__plot__zoomer_8cpp-source.html">qwt_plot_zoomer.cpp</a>.
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References <a class="el" href="qwt__plot__zoomer_8cpp-source.html#l00343">rescale()</a>, <a class="el" href="class_qwt_plot_zoomer.html#e4e9b90ccfb97f4eae54c667f79644ff">zoomed()</a>, and <a class="el" href="qwt__plot__zoomer_8cpp-source.html#l00258">zoomRect()</a>.    </td>
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<a class="anchor" name="eeed51dfa01136f00961e679dcbb9d9d"></a><!-- doxytag: member="QwtPlotZoomer::zoom" ref="eeed51dfa01136f00961e679dcbb9d9d" args="(const QwtDoubleRect &amp;)" --><p>
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          <td class="md" nowrap valign="top">void QwtPlotZoomer::zoom           </td>
          <td class="md" valign="top">(&nbsp;</td>
          <td class="md" nowrap valign="top">const QwtDoubleRect &amp;&nbsp;</td>
          <td class="mdname1" valign="top" nowrap> <em>rect</em>          </td>
          <td class="md" valign="top">&nbsp;)&nbsp;</td>
          <td class="md" nowrap><code> [virtual, slot]</code></td>
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Zoom in. 
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Clears all rectangles above the current position of the zoom stack and pushs the intersection of <a class="el" href="class_qwt_plot_zoomer.html#ef67ca3d673cbd6063f0574621c808ae">zoomRect()</a> and the normalized rect on it.<p>
<dl compact><dt><b>Note:</b></dt><dd>If the maximal stack depth is reached, zoom is ignored. <p>
The zoomed signal is emitted. </dd></dl>

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Definition at line <a class="el" href="qwt__plot__zoomer_8cpp-source.html#l00282">282</a> of file <a class="el" href="qwt__plot__zoomer_8cpp-source.html">qwt_plot_zoomer.cpp</a>.
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References <a class="el" href="qwt__plot__zoomer_8cpp-source.html#l00343">rescale()</a>, <a class="el" href="class_qwt_plot_zoomer.html#e4e9b90ccfb97f4eae54c667f79644ff">zoomed()</a>, and <a class="el" href="qwt__plot__zoomer_8cpp-source.html#l00258">zoomRect()</a>.
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Referenced by <a class="el" href="qwt__plot__zoomer_8cpp-source.html#l00575">end()</a>, <a class="el" href="qwt__plot__zoomer_8cpp-source.html#l00145">setMaxStackDepth()</a>, <a class="el" href="qwt__plot__zoomer_8cpp-source.html#l00429">widgetKeyPressEvent()</a>, and <a class="el" href="qwt__plot__zoomer_8cpp-source.html#l00406">widgetMouseReleaseEvent()</a>.    </td>
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<a class="anchor" name="ec745fbace2e6d1e69e7d9be0368bd8e"></a><!-- doxytag: member="QwtPlotZoomer::zoomBase" ref="ec745fbace2e6d1e69e7d9be0368bd8e" args="() const " --><p>
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          <td class="md" nowrap valign="top">QwtDoubleRect QwtPlotZoomer::zoomBase           </td>
          <td class="md" valign="top">(&nbsp;</td>
          <td class="mdname1" valign="top" nowrap>          </td>
          <td class="md" valign="top">&nbsp;)&nbsp;</td>
          <td class="md" nowrap> const</td>
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<p>
<dl compact><dt><b>Returns:</b></dt><dd>Initial rectangle of the zoomer </dd></dl>
<dl compact><dt><b>See also:</b></dt><dd><a class="el" href="class_qwt_plot_zoomer.html#7a1711597f441223efdb7d9931fe19b9">setZoomBase()</a>, <a class="el" href="class_qwt_plot_zoomer.html#ef67ca3d673cbd6063f0574621c808ae">zoomRect()</a> </dd></dl>

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Definition at line <a class="el" href="qwt__plot__zoomer_8cpp-source.html#l00190">190</a> of file <a class="el" href="qwt__plot__zoomer_8cpp-source.html">qwt_plot_zoomer.cpp</a>.
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Referenced by <a class="el" href="qwt__plot__zoomer_8cpp-source.html#l00467">move()</a>.    </td>
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<a class="anchor" name="e4e9b90ccfb97f4eae54c667f79644ff"></a><!-- doxytag: member="QwtPlotZoomer::zoomed" ref="e4e9b90ccfb97f4eae54c667f79644ff" args="(const QwtDoubleRect &amp;rect)" --><p>
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          <td class="md" nowrap valign="top">void QwtPlotZoomer::zoomed           </td>
          <td class="md" valign="top">(&nbsp;</td>
          <td class="md" nowrap valign="top">const QwtDoubleRect &amp;&nbsp;</td>
          <td class="mdname1" valign="top" nowrap> <em>rect</em>          </td>
          <td class="md" valign="top">&nbsp;)&nbsp;</td>
          <td class="md" nowrap><code> [signal]</code></td>
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<p>
A signal emitting the <a class="el" href="class_qwt_plot_zoomer.html#ef67ca3d673cbd6063f0574621c808ae">zoomRect()</a>, when the plot has been zoomed in or out.<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
  <table border="0" cellspacing="2" cellpadding="0">
    <tr><td valign="top"></td><td valign="top"><em>rect</em>&nbsp;</td><td>Current zoom rectangle. </td></tr>
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Referenced by <a class="el" href="qwt__plot__zoomer_8cpp-source.html#l00282">zoom()</a>.    </td>
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<a class="anchor" name="ef67ca3d673cbd6063f0574621c808ae"></a><!-- doxytag: member="QwtPlotZoomer::zoomRect" ref="ef67ca3d673cbd6063f0574621c808ae" args="() const " --><p>
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          <td class="md" nowrap valign="top">QwtDoubleRect QwtPlotZoomer::zoomRect           </td>
          <td class="md" valign="top">(&nbsp;</td>
          <td class="mdname1" valign="top" nowrap>          </td>
          <td class="md" valign="top">&nbsp;)&nbsp;</td>
          <td class="md" nowrap> const</td>
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<p>
Rectangle at the current position on the zoom stack.<p>
<dl compact><dt><b>See also:</b></dt><dd><a class="el" href="class_qwt_plot_zoomer.html#63797aa3b9e540a2c5f539fa34a05fbc">QwtPlotZoomer::zoomRectIndex()</a>, <a class="el" href="class_qwt_plot_picker.html#4bdeadb4e7a794bab248d1e2a2c76345">QwtPlotZoomer::scaleRect()</a>. </dd></dl>

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Definition at line <a class="el" href="qwt__plot__zoomer_8cpp-source.html#l00258">258</a> of file <a class="el" href="qwt__plot__zoomer_8cpp-source.html">qwt_plot_zoomer.cpp</a>.
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Referenced by <a class="el" href="qwt__plot__zoomer_8cpp-source.html#l00575">end()</a>, <a class="el" href="qwt__plot__zoomer_8cpp-source.html#l00467">move()</a>, and <a class="el" href="qwt__plot__zoomer_8cpp-source.html#l00282">zoom()</a>.    </td>
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<a class="anchor" name="63797aa3b9e540a2c5f539fa34a05fbc"></a><!-- doxytag: member="QwtPlotZoomer::zoomRectIndex" ref="63797aa3b9e540a2c5f539fa34a05fbc" args="() const " --><p>
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          <td class="md" nowrap valign="top">uint QwtPlotZoomer::zoomRectIndex           </td>
          <td class="md" valign="top">(&nbsp;</td>
          <td class="mdname1" valign="top" nowrap>          </td>
          <td class="md" valign="top">&nbsp;)&nbsp;</td>
          <td class="md" nowrap> const</td>
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<dl compact><dt><b>Returns:</b></dt><dd>Index of current position of zoom stack. </dd></dl>

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Definition at line <a class="el" href="qwt__plot__zoomer_8cpp-source.html#l00266">266</a> of file <a class="el" href="qwt__plot__zoomer_8cpp-source.html">qwt_plot_zoomer.cpp</a>.    </td>
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<a class="anchor" name="bbd7fe8750c177a82f80ea91611909fd"></a><!-- doxytag: member="QwtPlotZoomer::zoomStack" ref="bbd7fe8750c177a82f80ea91611909fd" args="() const " --><p>
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          <td class="md" nowrap valign="top">const QwtZoomStack &amp; QwtPlotZoomer::zoomStack           </td>
          <td class="md" valign="top">(&nbsp;</td>
          <td class="mdname1" valign="top" nowrap>          </td>
          <td class="md" valign="top">&nbsp;)&nbsp;</td>
          <td class="md" nowrap> const</td>
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<p>
Return the zoom stack. <a class="el" href="class_qwt_plot_zoomer.html#bbd7fe8750c177a82f80ea91611909fd">zoomStack()</a>[0] is the zoom base, <a class="el" href="class_qwt_plot_zoomer.html#bbd7fe8750c177a82f80ea91611909fd">zoomStack()</a>[1] the first zoomed rectangle. 
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Definition at line <a class="el" href="qwt__plot__zoomer_8cpp-source.html#l00181">181</a> of file <a class="el" href="qwt__plot__zoomer_8cpp-source.html">qwt_plot_zoomer.cpp</a>.    </td>
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