QwtPlot::setPlotLayout(..)

とりあえず使い方

#include "main.h"

#include <qwt_plot_curve.h>
#include <qwt_symbol.h>
#include <qwt_plot_layout.h>
#include <qwt_plot.h>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    //MainWindow w;
    //w.show();

    QwtPlot *plot = new QwtPlot;
    plot->setTitle("Title");                //グラフのタイトル
    plot->setFooter("Footer");
    plot->setCanvasBackground(QBrush(Qt::white));//キャンバスの背景　青

    plot->setAxisTitle(0,"[kw]");       // y軸のタイトル
    plot->setAxisTitle(2,"Time [Sec]");

    plot->setAxisScale( QwtPlot::yLeft, 0.0, 10.0 );
    plot->setAxisScale( QwtPlot::xBottom, 0.0, 5.0 );

    QwtPlotCurve *curve = new QwtPlotCurve();
    curve->setTitle( "Some Points" );
    curve->setPen( Qt::blue, 4 ),
            curve->setRenderHint( QwtPlotItem::RenderAntialiased, true );

    QwtSymbol *symbol = new QwtSymbol( QwtSymbol::Ellipse,
        QBrush( Qt::yellow ), QPen( Qt::red, 2 ), QSize( 8, 8 ) );
    curve->setSymbol( symbol );

    QPolygonF points;
    points << QPointF( 0.0, 4.4 ) << QPointF( 1.0, 3.0 )
           << QPointF( 2.0, 4.5 ) << QPointF( 3.0, 6.8 )
           << QPointF( 4.0, 7.9 ) << QPointF( 5.0, 7.1 );
    curve->setSamples( points );
    curve->attach( plot );

    QwtPlotLayout *qwtLayout = plot->plotLayout();
    qwtLayout->setCanvasMargin(100,QwtPlot::yLeft);

    //plot->setPlotLayout(qwtLayout);

    //plot->replot();

    plot->resize( 600, 400 );
    plot->show();
    return a.exec();
}


void MyMain::setValueToTheLabel(double value)
{
    qDebug() << QString::number( value );
}