Help with changing axis scale with QwtSpectrogram

[Uwe]

X-AXIS: 0 to 2048us with step 2us
Y-AXIS: -2560 to 2560Hz with step 20Hz

Then you have to write:

DSPFunc::DSPFunc()
{
    setInterval( Qt::XAxis, QwtInterval( 0.0, 2048.0 ) );
    setInterval( Qt::YAxis, QwtInterval( -2560, 2560 ) );
}

DSPFunc::DSPFunc()
{
    setInterval( Qt::XAxis, QwtInterval( 0.0, 2048.0 ) );
    setInterval( Qt::YAxis, QwtInterval( -2560, 2560 ) );
}

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and

double DSPFunc::value( double x, double y ) const
{
    const int ix = x / 2;
    const int iy = ( 2560 + y ) / 20;
 
    if ( ix < 0 || iy < 0 || ... )
        return qQNaN();
 
    return Abs[ix][iy];
}
 
QRectF DspFunc::pixelHint( const QRectF & ) const
{
    return QRectF( 0.0, 0.0, 2.0, 20.0 );
}

double DSPFunc::value( double x, double y ) const
{
    const int ix = x / 2;
    const int iy = ( 2560 + y ) / 20;

    if ( ix < 0 || iy < 0 || ... )
        return qQNaN();

    return Abs[ix][iy];
}

QRectF DspFunc::pixelHint( const QRectF & ) const
{
    return QRectF( 0.0, 0.0, 2.0, 20.0 );
}

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