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.

Untitled.jpg

Qt Code: 
  1. #include "subwindow_uwi.h"
  2. #include "ui_subwindow_uwi.h"
  3. #include <qwt_scale_draw.h>
  4. #include "dmg_eva.h"
  5. #include <QMessageBox>
  6. #include "plot_frm.h"
  7.  
  8.  
  9. class MyScaleDraw1: public QwtScaleDraw
  10. {
  11. public:
  12.     MyScaleDraw1()
  13.     {
  14.         setTickLength( QwtScaleDiv::MajorTick, 10 );
  15.         setTickLength( QwtScaleDiv::MinorTick, 2 );
  16.         setTickLength( QwtScaleDiv::MediumTick, 0 );
  17.  
  18.         setLabelRotation( 0 );
  19.         setLabelAlignment( Qt::AlignLeft | Qt::AlignVCenter );
  20.         setSpacing( 10 );
  21.     }
  22.  
  23.     virtual QwtText label( double value ) const
  24.     {
  25.         QwtText h=QwtText(QString::number((value*info_Inspection.scanInterval.toFloat())-(info_Inspection.Width.toInt()/2)));
  26.         return h;
  27.     }
  28. };
  29.  
  30. class MyScaleDraw2: public QwtScaleDraw
  31. {
  32. public:
  33.     MyScaleDraw2()
  34.     {
  35.         setTickLength( QwtScaleDiv::MajorTick, 2 );
  36.         setTickLength( QwtScaleDiv::MinorTick, 0 );
  37.         setTickLength( QwtScaleDiv::MediumTick, 0 );
  38.         setLabelRotation( 0 );
  39.         setLabelAlignment( Qt::AlignLeft | Qt::AlignVCenter );
  40.         setSpacing( 10 );
  41.     }
  42.  
  43.     virtual QwtText label( double value ) const
  44.     {
  45.         QwtText h=QwtText(QString::number((value*25/(info_FPGA.s_points/2))-12.5,'f',1));
  46.         return h;
  47.     }
  48. };
  49.  
  50. subwindow_uwi::subwindow_uwi(QWidget *parent) :
  51.     QDialog(parent),
  52.     ui(new Ui::subwindow_uwi)
  53. {
  54.     ui->setupUi(this);
  55. }
  56.  
  57. subwindow_uwi::~subwindow_uwi()
  58. {
  59.     delete ui;
  60. }
  61.  
  62. void subwindow_uwi::setframe()
  63. {
  64. 	d_plot_WavenumberSpectrum = new plot_frm( ui->WavenumberSpectrum );
  65. 	d_plot_WavenumberSpectrum->setGeometry(20,20,400,320);
  66. 	d_plot_WavenumberSpectrum->updateGeometry();
  67. 	d_plot_WavenumberSpectrum->updateAxes();
  68. 	d_plot_WavenumberSpectrum->setcolorbarmax(9);
  69. 	d_plot_WavenumberSpectrum->setAxisScaleDraw( QwtPlot::xBottom, new MyScaleDraw1() );
  70. 	d_plot_WavenumberSpectrum->setAxisScaleDraw( QwtPlot::yLeft, new MyScaleDraw2() );
  71. }
  72.  
  73. void subwindow_uwi::on_PB_delete()
  74. {
  75.     delete d_plot_WavenumberSpectrum;
  76.  
  77. }
  78.  
  79. void subwindow_uwi::on_PB_WavenumberSpectrum_clicked()
  80. {
  82.  
  83.     if(run_wavenumber_vs_frequency_read() != SIPIF_ERR_OK )
  84.     {  msgb.setText("Cannot read");   msgb.exec();
  85.     }
  86.  
  87.     setframe();
  88.  
  89. }
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Best Regards,

HAIDER