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myScale = new QwtScaleWidget;
myScaleDraw = new QwtScaleDraw;
myScale->setScaleDraw(myScaleDraw);

void QwtPlotItem::setYAxis (int axis); 
// axis = QwtPlot::yLeft or QwtPlot::yRight

--> d_data->canvasRect.setRect(39,50,1097,560);
yLeft[0] x=0.000000 y=50.000000 w=39.000000 h=560.000000
yBottom[20] x=39.000000 y=610.000000 w=1097.000000 h=27.000000
Left 0 Valid
Left 1 INValid
Left 2 INValid
Left 3 INValid
Left 4 INValid
Left 5 INValid
Left 6 INValid
Left 7 INValid
Left 8 INValid
Left 9 INValid

curv2 = new QwtPlotCurve(QString("U2(t)"));
curv2->attach(myPlot);

ошибка: 'class QwtPlot' has no member named 'setAxes'

QwtPlotItem::setAxes

int xb = QwtPlot::xBottom;
int yl = QwtPlot::yLeft;
curv1->setAxes(xb,yl);
ui->myPlot->enableAxis(yl);
int xb2 = QwtPlot::xBottom;
int yl2 = QwtPlot::yLeft;
curv2->setAxes(xb2,yl2);
ui->myPlot->enableAxis(yl2);

Index: qwt_plot.h
===================================================================
--- qwt_plot.h	(revision 1014)
+++ qwt_plot.h	(working copy)
@@ -74,25 +74,19 @@
         READ grabProperties WRITE applyProperties )
 
 public:
-    //! \brief Axis index
-    enum Axis
-    {
-        //! Y axis left of the canvas
-        yLeft,
 
-        //! Y axis right of the canvas
-        yRight,
+    static const int axisCntBySide = 10;
+    static const int yLeft         = 0;
+    static const int yLeftMax      = yLeft      + axisCntBySide - 1;
+    static const int yRight        = yLeftMax   + 1;
+    static const int yRightMax     = yRight     + axisCntBySide - 1;
+    static const int xBottom       = yRightMax  + 1;
+    static const int xBottomMax    = xBottom    + axisCntBySide - 1;
+    static const int xTop          = xBottomMax + 1;
+    static const int xTopMax       = xTop       + axisCntBySide - 1;
+    static const int axisCnt       = xTopMax    + 1;
 
-        //! X axis below the canvas
-        xBottom,
 
-        //! X axis above the canvas
-        xTop,
-
-        //! Number of axes
-        axisCnt
-    };
-
     /*!
         Position of the legend, relative to the canvas.

    
    curv1 = new QwtPlotCurve("Amplitude");
    curv1->setRenderHint(QwtPlotItem::RenderAntialiased);
    curv1->setPen(QPen(Qt::red));
    int xb = QwtPlot::xBottom;
    int yl = QwtPlot::yLeft;
    curv1->setAxes(xb,yl);
    myPlot->enableAxis(yl);
   curv1->attach(myPlot);
///////
   curv2 = new QwtPlotCurve("Amplitude");
   curv2->setRenderHint(QwtPlotItem::RenderAntialiased);
   curv2->setPen(QPen(Qt::green));
   int xb2 = QwtPlot::xBottom;
   int yl2 = QwtPlot::yLeft+1;
   curv2->setAxes(xb2,yl2);
   myPlot->enableAxis(yl2);
   curv2->attach(myPlot);

    d_zoomer[0] = new Zoomer( xb, yl,
    myPlot->canvas());
    d_zoomer[0]->setRubberBand(QwtPicker::RectRubberBand);
    d_zoomer[0]->setRubberBandPen(QColor(Qt::green));
    d_zoomer[0]->setTrackerMode(QwtPicker::ActiveOnly);
    d_zoomer[0]->setTrackerPen(QColor(Qt::white));

    d_zoomer[1] = new Zoomer(QwtPlot::xTop, QwtPlot::yRight,
         myPlot->canvas());

    d_zoomer1[0] = new Zoomer( xb2, yl2,
        myPlot->canvas());
    d_zoomer1[0]->setRubberBand(QwtPicker::RectRubberBand);
    d_zoomer1[0]->setRubberBandPen(QColor(Qt::green));
    d_zoomer1[0]->setTrackerMode(QwtPicker::ActiveOnly);
    d_zoomer1[0]->setTrackerPen(QColor(Qt::white));

    d_zoomer1[1] = new Zoomer(QwtPlot::xTop, QwtPlot::yRight,
         myPlot->canvas());