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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><meta http-equiv="Content-Type" content="text/html;charset=iso-8859-1"><title>Qwt User's Guide: QwtPlot Class Reference</title><link href="doxygen.css" rel="stylesheet" type="text/css"><link href="tabs.css" rel="stylesheet" type="text/css"></head><body><!-- Generated by Doxygen 1.4.6 --><div class="tabs"> <ul> <li><a href="index.html"><span>Main Page</span></a></li> <li id="current"><a href="classes.html"><span>Classes</span></a></li> <li><a href="files.html"><span>Files</span></a></li> <li><a href="pages.html"><span>Related Pages</span></a></li> </ul></div><div class="tabs"> <ul> <li><a href="classes.html"><span>Alphabetical List</span></a></li> <li><a href="annotated.html"><span>Class List</span></a></li> <li><a href="hierarchy.html"><span>Class Hierarchy</span></a></li> <li><a href="functions.html"><span>Class Members</span></a></li> </ul></div><h1>QwtPlot Class Reference</h1><!-- doxytag: class="QwtPlot" --><!-- doxytag: inherits="QwtPlotDict" -->Inheritance diagram for QwtPlot:<p><center><img src="class_qwt_plot__inherit__graph.png" border="0" usemap="#_qwt_plot__inherit__map" alt="Inheritance graph"></center><map name="_qwt_plot__inherit__map"><area href="class_qwt_plot_dict.html" shape="rect" coords="7,8,97,32" alt=""></map><center><font size="2">[<a href="graph_legend.html">legend</a>]</font></center>Collaboration diagram for QwtPlot:<p><center><img src="class_qwt_plot__coll__graph.png" border="0" usemap="#_qwt_plot__coll__map" alt="Collaboration graph"></center><map name="_qwt_plot__coll__map"><area href="class_qwt_plot_dict.html" shape="rect" coords="7,8,97,32" alt=""></map><center><font size="2">[<a href="graph_legend.html">legend</a>]</font></center><a href="class_qwt_plot-members.html">List of all members.</a><hr><a name="_details"></a><h2>Detailed Description</h2>A 2-D plotting widget. <p><a class="el" href="class_qwt_plot.html">QwtPlot</a> is a widget for plotting two-dimensional graphs. An unlimited number of plot items can be displayed on its canvas. Plot items might be curves (<a class="el" href="class_qwt_plot_curve.html">QwtPlotCurve</a>), markers (<a class="el" href="class_qwt_plot_marker.html">QwtPlotMarker</a>), the grid (<a class="el" href="class_qwt_plot_grid.html">QwtPlotGrid</a>), or anything else derived from <a class="el" href="class_qwt_plot_item.html">QwtPlotItem</a>. A plot can have up to four axes, with each plot item attached to an x- and a y axis. The scales at the axes can be explicitely set (<a class="el" href="class_qwt_scale_div.html">QwtScaleDiv</a>), or are calculated from the plot items, using algorithms (<a class="el" href="class_qwt_scale_engine.html">QwtScaleEngine</a>) which can be configured separately for each axis.<p><div align="center"><img src="plot.png" alt="plot.png"></div><p><dl compact><dt><b>Example</b></dt><dd>The following example shows (schematically) the most simple way to use <a class="el" href="class_qwt_plot.html">QwtPlot</a>. By default, only the left and bottom axes are visible and their scales are computed automatically. <div class="fragment"><pre class="fragment">#include <qwt_plot.h>#include <qwt_plot_curve.h>QwtPlot *myPlot;double x[100], y1[100], y2[100]; // x and y valuesmyPlot = new QwtPlot("Two Curves", parent);// add curvesQwtPlotCurve *curve1 = new QwtPlotCurve("Curve 1");QwtPlotCurve *curve2 = new QwtPlotCurve("Curve 2");getSomeValues(x, y1, y2);// copy the data into the curvescurve1->setData(x, y1, 100);curve2->setData(x, y2, 100);curve1->attach(myPlot);curve2->attach(myPlot);// finally, refresh the plotmyPlot->replot();</pre></div> </dd></dl><p><p>Definition at line <a class="el" href="qwt__plot_8h-source.html#l00077">77</a> of file <a class="el" href="qwt__plot_8h-source.html">qwt_plot.h</a>.<table border="0" cellpadding="0" cellspacing="0"><tr><td></td></tr><tr><td colspan="2"><br><h2>Public Types</h2></td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">enum </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_plot.html#81df699dcf9dde0752c0726b5f31e271">Axis</a> { <br> <b>yLeft</b>, <br> <b>yRight</b>, <br> <b>xBottom</b>, <br> <b>xTop</b>, <br> <b>axisCnt</b><br> }</td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">enum </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_plot.html#31aacb65b5c049dde8c34a0d8482661b">LegendPosition</a> { <br> <b>LeftLegend</b>, <br> <b>RightLegend</b>, <br> <b>BottomLegend</b>, <br> <b>TopLegend</b>, <br> <b>ExternalLegend</b><br> }</td></tr><tr><td colspan="2"><br><h2>Public Slots</h2></td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_plot.html#e2191d8ad33164b83aa2a14563f132a5">clear</a> ()</td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">virtual void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_plot.html#7b094e29b8e92b00e36517d0d7633c4b">replot</a> ()</td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_plot.html#ea78ab565d05b69b8730a4af2a11f07e">autoRefresh</a> ()</td></tr><tr><td colspan="2"><br><h2>Signals</h2></td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_plot.html#52b75d5548fbe04539b6297de53a2222">legendClicked</a> (<a class="el" href="class_qwt_plot_item.html">QwtPlotItem</a> *plotItem)</td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_plot.html#bd9e17629dd7c142fed017ea5e347149">legendChecked</a> (<a class="el" href="class_qwt_plot_item.html">QwtPlotItem</a> *plotItem, bool on)</td></tr><tr><td colspan="2"><br><h2>Public Member Functions</h2></td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_plot.html#cde7121614da027e9a1dbc4591613ca7">QwtPlot</a> (QWidget *=NULL)</td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_plot.html#12888a2101ba2091db0e4710c6a109cb">QwtPlot</a> (const <a class="el" href="class_qwt_text.html">QwtText</a> &title, QWidget *p=NULL)</td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">virtual </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_plot.html#2b60620e3681810946dcc66002aad016">~QwtPlot</a> ()</td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="e7e93c7112d16cbd299cf3cbc0bf9f9f"></a><!-- doxytag: member="QwtPlot::applyProperties" ref="e7e93c7112d16cbd299cf3cbc0bf9f9f" args="(const QString &)" -->void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_plot.html#e7e93c7112d16cbd299cf3cbc0bf9f9f">applyProperties</a> (const QString &)</td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="fd1c65720e19e50aa083dabd5bbf88e8"></a><!-- doxytag: member="QwtPlot::grabProperties" ref="fd1c65720e19e50aa083dabd5bbf88e8" args="() const " -->QString </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_plot.html#fd1c65720e19e50aa083dabd5bbf88e8">grabProperties</a> () const </td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_plot.html#654934ec2ad167101dacb5174f5172d6">setAutoReplot</a> (bool tf=true)</td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_plot.html#f14053ca41be0f9c6f820ed3c4379831">autoReplot</a> () const </td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_plot.html#db2f14174770601e55d6822437c3fe26">print</a> (QPaintDevice &p, const <a class="el" href="class_qwt_plot_print_filter.html">QwtPlotPrintFilter</a> &=<a class="el" href="class_qwt_plot_print_filter.html">QwtPlotPrintFilter</a>()) const </td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">virtual void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_plot.html#2170b35727d35c9b9f4031f490789adc">print</a> (QPainter *, const QRect &rect, const <a class="el" href="class_qwt_plot_print_filter.html">QwtPlotPrintFilter</a> &=<a class="el" href="class_qwt_plot_print_filter.html">QwtPlotPrintFilter</a>()) const </td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="el" href="class_qwt_plot_layout.html">QwtPlotLayout</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_plot.html#9156b14a6f67f6279a16fea063ce1d14">plotLayout</a> ()</td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">const <a class="el" href="class_qwt_plot_layout.html">QwtPlotLayout</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_plot.html#6abb53bb19d8e931ba49bf439779f0ac">plotLayout</a> () const </td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_plot.html#26f01ba1c3c85308db6cac67c5f1159c">setMargin</a> (int margin)</td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_plot.html#546ff473d973512141cc974e3609ad14">margin</a> () const </td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_plot.html#9a7f0b219b404e5bed5dfca26c5c06a7">setTitle</a> (const QString &)</td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_plot.html#032ced8ddfad7483a372214954203719">setTitle</a> (const <a class="el" href="class_qwt_text.html">QwtText</a> &t)</td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="el" href="class_qwt_text.html">QwtText</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_plot.html#1ae4b2e10f6691b7f1a14af70f743e2c">title</a> () const </td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="el" href="class_qwt_text_label.html">QwtTextLabel</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_plot.html#c39356b86ed70ebf256a8ae964910206">titleLabel</a> ()</td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">const <a class="el" href="class_qwt_text_label.html">QwtTextLabel</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_plot.html#bea1bb53b3f08fb085a1d954eb199078">titleLabel</a> () const </td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="el" href="class_qwt_plot_canvas.html">QwtPlotCanvas</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_plot.html#afcc82150034fbeb393ceb9f54ba2f1a">canvas</a> ()</td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">const <a class="el" href="class_qwt_plot_canvas.html">QwtPlotCanvas</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_plot.html#31bea08461f58028fec6c2882f9a125c">canvas</a> () const </td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_plot.html#1a56902d2109fcf709ad1dbd35f0b859">setCanvasBackground</a> (const QColor &c)</td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">const QColor & </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_plot.html#99109068ad7749dfe28074abe3cc49af">canvasBackground</a> () const </td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_plot.html#5af96e90be286753d524bdb042917618">setCanvasLineWidth</a> (int w)</td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_plot.html#200c23f4574d857afc3f457999fcd0ce">canvasLineWidth</a> () const </td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">virtual <a class="el" href="class_qwt_scale_map.html">QwtScaleMap</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_plot.html#ff5efd21f11ec91fb8f791799cb4db2f">canvasMap</a> (int axisId) const </td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">double </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_plot.html#b98066e62e3a9f574f8f1d482974ef5c">invTransform</a> (int axisId, int pos) const </td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_plot.html#fea608e3f40d0148aac5822f46fcb67a">transform</a> (int axisId, double value) const </td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="619b65bb95090ab5a528e33a5014ae4f"></a><!-- doxytag: member="QwtPlot::axisScaleEngine" ref="619b65bb95090ab5a528e33a5014ae4f" args="(int axisId)" --><a class="el" href="class_qwt_scale_engine.html">QwtScaleEngine</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_plot.html#619b65bb95090ab5a528e33a5014ae4f">axisScaleEngine</a> (int axisId)</td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="3e29973bcd6c879056ad655de8f667d8"></a><!-- doxytag: member="QwtPlot::axisScaleEngine" ref="3e29973bcd6c879056ad655de8f667d8" args="(int axisId) const " -->const <a class="el" href="class_qwt_scale_engine.html">QwtScaleEngine</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_plot.html#3e29973bcd6c879056ad655de8f667d8">axisScaleEngine</a> (int axisId) const </td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="bf09452377b53e584a5086354a134d78"></a><!-- doxytag: member="QwtPlot::setAxisScaleEngine" ref="bf09452377b53e584a5086354a134d78" args="(int axisId, QwtScaleEngine *)" -->void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_plot.html#bf09452377b53e584a5086354a134d78">setAxisScaleEngine</a> (int axisId, <a class="el" href="class_qwt_scale_engine.html">QwtScaleEngine</a> *)</td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_plot.html#8138eee4eb6989a1f6d93bd34b9c4cfa">setAxisAutoScale</a> (int axisId)</td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_plot.html#112a1bc0b4f7132b10bc5b4efae45686">axisAutoScale</a> (int axisId) const </td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_plot.html#b644f7a0a0566ff776c89cc225ce37d7">enableAxis</a> (int axisId, bool tf=true)</td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_plot.html#ac5107a1ec8836b53f084a5b1bb8cc43">axisEnabled</a> (int axisId) const </td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_plot.html#9a14e57652c016f40388a68e556917e3">setAxisFont</a> (int axisId, const QFont &f)</td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">QFont </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_plot.html#637e2261d7722f00b2ce2bacadca8ffa">axisFont</a> (int axisId) const </td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_plot.html#cef5ea818944b93b8695d0c16924eed6">setAxisScale</a> (int axisId, double min, double max, double step=0)</td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_plot.html#2365da57b983eb39752fa4f6378c225a">setAxisScaleDiv</a> (int axisId, const <a class="el" href="class_qwt_scale_div.html">QwtScaleDiv</a> &)</td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_plot.html#956a14b08e016eb83768ff4187d3849d">setAxisScaleDraw</a> (int axisId, <a class="el" href="class_qwt_scale_draw.html">QwtScaleDraw</a> *)</td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">const <a class="el" href="class_qwt_scale_div.html">QwtScaleDiv</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_plot.html#596fc7e7960324ddc949c36242c5e6d6">axisScaleDiv</a> (int axisId) const </td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="el" href="class_qwt_scale_div.html">QwtScaleDiv</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_plot.html#f20f32c68fdd8ae4adfeabf21eb6068b">axisScaleDiv</a> (int axisId)</td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">const <a class="el" href="class_qwt_scale_draw.html">QwtScaleDraw</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_plot.html#2ff0d0733c0ce8bb275cfde23bf9736c">axisScaleDraw</a> (int axisId) const </td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="el" href="class_qwt_scale_draw.html">QwtScaleDraw</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_plot.html#bbb49f1730c3ea9f636c032f81e5a87e">axisScaleDraw</a> (int axisId)</td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">const <a class="el" href="class_qwt_scale_widget.html">QwtScaleWidget</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_plot.html#6b495d9b17962be6e098026441a1f7b8">axisWidget</a> (int axisId) const </td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="el" href="class_qwt_scale_widget.html">QwtScaleWidget</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_plot.html#e3386e1d38f70864c4c019c0eb6a3d9d">axisWidget</a> (int axisId)</td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_plot.html#19f1b67fa79b80c712cf5f52b97ea0c5">setAxisLabelAlignment</a> (int axisId, Qt::Alignment)</td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_plot.html#d5fa7aa01c88eab38ad64b131584f977">setAxisLabelRotation</a> (int axisId, double rotation)</td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_plot.html#5d60f1836e05e5cc5c7fe9570d6a608a">setAxisTitle</a> (int axisId, const QString &)</td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_plot.html#d134a193ab40ce33743365558d0303c4">setAxisTitle</a> (int axisId, const <a class="el" href="class_qwt_text.html">QwtText</a> &)</td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="el" href="class_qwt_text.html">QwtText</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_plot.html#7807148d386457345025571e2a8e0983">axisTitle</a> (int axisId) const </td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_plot.html#a45b271684d6202061f1afcfa70e7cf6">setAxisMaxMinor</a> (int axisId, int maxMinor)</td></tr>⌨️ 快捷键说明
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