Qt Qwt打点画图

class="baidu_pl">

class="article_content clearfix">

class="htmledit_views">

源程序：FunCurve.h

class="language-cpp">#ifndef FUNCURVE_H
#define FUNCURVE_H

#include <QMainWindow>
#include <qwt_class="tags" href="/tags/PLOT.html" title=plot>plot_curve.h>
#include <QVector>
#include <qwt_symbol.h>

namespace Ui {
class FunCurve;
}

class FunCurve : public QMainWindow
{
    Q_OBJECT
    
public:
    explicit FunCurve(QWidget *parent = 0);
    ~FunCurve();
    
private:
    Ui::FunCurve *class="tags" href="/tags/UI.html" title=ui>ui;
    QwtPlotCurve *  curve;
    QVector<double> xData;
    QVector<double> yData;
};

#endif // FUNCURVE_H

FunCurve.cpp

class="language-cpp">#include "funcurve.h"
#include "class="tags" href="/tags/UI.html" title=ui>ui_funcurve.h"
FunCurve::FunCurve(QWidget *parent) :
    QMainWindow(parent),
    class="tags" href="/tags/UI.html" title=ui>ui(new Ui::FunCurve)
{
    class="tags" href="/tags/UI.html" title=ui>ui->setupUi(this);
    class="tags" href="/tags/UI.html" title=ui>ui->class="tags" href="/tags/PLOT.html" title=plot>plot->setCanvasBackground(Qt::green);
    curve = new QwtPlotCurve();
    curve->attach(this->class="tags" href="/tags/UI.html" title=ui>ui->class="tags" href="/tags/PLOT.html" title=plot>plot);
    class="tags" href="/tags/UI.html" title=ui>ui->class="tags" href="/tags/PLOT.html" title=plot>plot->setAxisScale(QwtPlot::xBottom, 0.0, 10.0);
    class="tags" href="/tags/UI.html" title=ui>ui->class="tags" href="/tags/PLOT.html" title=plot>plot->setAxisScale(QwtPlot::yLeft, 0.0, 10.0);
    class="tags" href="/tags/UI.html" title=ui>ui->class="tags" href="/tags/PLOT.html" title=plot>plot->setAxisTitle(QwtPlot::xBottom,"x   -->");
    class="tags" href="/tags/UI.html" title=ui>ui->class="tags" href="/tags/PLOT.html" title=plot>plot->setAxisTitle(QwtPlot::yLeft,"y   -->");
    for(int x=0;x<100;x++)
    {
       xData.append((double)x);
       yData.append((double)x);
    }
    curve->setSymbol(new QwtSymbol(QwtSymbol::Cross, Qt::NoBrush,
        QPen(Qt::black), QSize(5, 5) ) );
    curve->setPen(QColor(Qt::darkGreen));
    curve->setStyle(QwtPlotCurve::Lines);
    curve->setCurveAttribute(QwtPlotCurve::Fitted);
    /*
    d_curves[i].setSymbol(new QwtSymbol(QwtSymbol::Ellipse, Qt::yellow,
        QPen(Qt::blue), QSize(5, 5) ) );
    d_curves[i].setPen(QColor(Qt::red));
    d_curves[i].setStyle(QwtPlotCurve::Sticks);
    i++;
    d_curves[i].setPen(QColor(Qt::darkBlue));
    d_curves[i].setStyle(QwtPlotCurve::Lines);   //*qwtexample中的实例，画图样式
    i++;
    d_curves[i].setPen(QColor(Qt::darkBlue));
    d_curves[i].setStyle(QwtPlotCurve::Lines);
    d_curves[i].setRenderHint(QwtPlotItem::RenderAntialiased);
    i++;
    d_curves[i].setPen(QColor(Qt::darkCyan));
    d_curves[i].setStyle(QwtPlotCurve::Steps);
    i++;
    d_curves[i].setSymbol(new QwtSymbol(QwtSymbol::XCross, Qt::NoBrush,
        QPen(Qt::darkMagenta), QSize(5, 5) ) );
    d_curves[i].setStyle(QwtPlotCurve::NoCurve);
    */
    curve->setRawSamples(&xData[0], &yData[0], xData.size());
    class="tags" href="/tags/UI.html" title=ui>ui->class="tags" href="/tags/PLOT.html" title=plot>plot->reclass="tags" href="/tags/PLOT.html" title=plot>plot();
}
FunCurve::~FunCurve()
{
    delete class="tags" href="/tags/UI.html" title=ui>ui;
}