creating custom curve style

[kja]

Hi I am having a problem making my own QwtPlotCurve style. I want to make dotted lines like this post http://www.qtcentre.org/threads/2017...ht=dottedlines but I can't figure out how to call my new curve style.

My question is how do I actually call my style?

right now I put the built in curve styles into a list of styles like this

QwtPlotCurve::CurveStyle Styles[] = { QwtPlotCurve::Lines, QwtPlotCurve::Sticks, QwtPlotCurve::Steps, QwtPlotCurve::Dots};
  for( int i = 0; i < 4; i++)
    this->Styles[i] = Styles[i];

QwtPlotCurve::CurveStyle Styles[] = { QwtPlotCurve::Lines, QwtPlotCurve::Sticks, QwtPlotCurve::Steps, QwtPlotCurve::Dots};
  for( int i = 0; i < 4; i++)
    this->Styles[i] = Styles[i];

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am I supposed to add QwtPlotCurve::UserCurve into that list, and if so how do I make sure it calls my reimplemented drawCurve? I think I am missing something basic.

Another idea that I had was to just call my class when I try to set the style

curve->setStyle(dotLines->DottedLines);

curve->setStyle(dotLines->DottedLines);

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but I get the error 'QwtPlotCurve::setStyle' : cannot convert parameter 1 from 'DotLines::curveStyle' to 'QwtPlotCurve::CurveStyle'

which confuses me because my class DotLines inherits from QwtPlotCurve

class DotLines : public QwtPlotCurve{
  public:
 
  enum curveStyle
  {
    DottedLines = QwtPlotCurve::UserCurve + 1000
  };
 
 
  virtual void drawCurve( QPainter * painter, int style, const QwtScaleMap &xMap, const QwtScaleMap &yMap, const QRectF &canvasRect, int from, int to) const{
    if( style < QwtPlotCurve ::UserCurve )
      QwtPlotCurve::drawCurve(painter, style, xMap, yMap, canvasRect, from, to );
  }else{
      /// make dotted lines
  }
 
};

class DotLines : public QwtPlotCurve{
  public:
  
  enum curveStyle
  {
    DottedLines = QwtPlotCurve::UserCurve + 1000
  };


  virtual void drawCurve( QPainter * painter, int style, const QwtScaleMap &xMap, const QwtScaleMap &yMap, const QRectF &canvasRect, int from, int to) const{
    if( style < QwtPlotCurve ::UserCurve )
      QwtPlotCurve::drawCurve(painter, style, xMap, yMap, canvasRect, from, to );
  }else{
      /// make dotted lines
  }
  
};

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Any Ideas? Thanks

[Uwe]

Well. this is more a C++ beginner question, than Qwt related. The simple answer is: use casts.

Uwe