Problem with qwtplot update/ destruction

Dear,

I am using a qwt plot and I want to update/or delete on a button click... problem is that i cannot delete the axis scales and when I create new it gets overwrite as shown in pic below.

Attachment 12141

Code:

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#include "subwindow_uwi.h"
#include "ui_subwindow_uwi.h"
#include <qwt_scale_draw.h>
#include "dmg_eva.h"
#include <QMessageBox>
#include "plot_frm.h"
 
 
class MyScaleDraw1: public QwtScaleDraw
{
public:
    MyScaleDraw1()
    {
        setTickLength( QwtScaleDiv::MajorTick, 10 );
        setTickLength( QwtScaleDiv::MinorTick, 2 );
        setTickLength( QwtScaleDiv::MediumTick, 0 );
 
        setLabelRotation( 0 );
        setLabelAlignment( Qt::AlignLeft | Qt::AlignVCenter );
        setSpacing( 10 );
    }
 
    virtual QwtText label( double value ) const
    {
        QwtText h=QwtText(QString::number((value*info_Inspection.scanInterval.toFloat())-(info_Inspection.Width.toInt()/2)));
        return h;
    }
};
 
class MyScaleDraw2: public QwtScaleDraw
{
public:
    MyScaleDraw2()
    {
        setTickLength( QwtScaleDiv::MajorTick, 2 );
        setTickLength( QwtScaleDiv::MinorTick, 0 );
        setTickLength( QwtScaleDiv::MediumTick, 0 );
        setLabelRotation( 0 );
        setLabelAlignment( Qt::AlignLeft | Qt::AlignVCenter );
        setSpacing( 10 );
    }
 
    virtual QwtText label( double value ) const
    {
        QwtText h=QwtText(QString::number((value*25/(info_FPGA.s_points/2))-12.5,'f',1));
        return h;
    }
};
 
subwindow_uwi::subwindow_uwi(QWidget *parent) :
    QDialog(parent),
    ui(new Ui::subwindow_uwi)
{
    ui->setupUi(this);
}
 
subwindow_uwi::~subwindow_uwi()
{
    delete ui;
}
 
void subwindow_uwi::setframe()
{
	d_plot_WavenumberSpectrum = new plot_frm( ui->WavenumberSpectrum );
	d_plot_WavenumberSpectrum->setGeometry(20,20,400,320);
	d_plot_WavenumberSpectrum->updateGeometry();
	d_plot_WavenumberSpectrum->updateAxes();
	d_plot_WavenumberSpectrum->setcolorbarmax(9);
	d_plot_WavenumberSpectrum->setAxisScaleDraw( QwtPlot::xBottom, new MyScaleDraw1() );
	d_plot_WavenumberSpectrum->setAxisScaleDraw( QwtPlot::yLeft, new MyScaleDraw2() );
}
 
void subwindow_uwi::on_PB_delete()
{
    delete d_plot_WavenumberSpectrum;
 
}
 
void subwindow_uwi::on_PB_WavenumberSpectrum_clicked()
{
    QMessageBox msgb;
 
    if(run_wavenumber_vs_frequency_read() != SIPIF_ERR_OK )
    {  msgb.setText("Cannot read");   msgb.exec();
    }
 
    setframe();
 
}

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Best Regards,

HAIDER

In line 79, you call setFrame() (which creates a new d_plot_WavenumberSpectrum), but you do not delete the old one. So you probably have two plots on top of each other and that is why it looks like there are two sets of axes. I think there are actually two complete plots, but because the center part is a spectrogram one of these covers up the other.

I also have a delete button. and I first delete before making new one