Hi,

I am having trouble draw a polyline from a vector of QPointF which is calculated in another class "getAvgHighTempVec".

Here is my code:

Qt Code: 
  1. // main.cpp
  2.     size_t qpoint_size = c.getAvgHighTempVec().size();
  3.     QVector<QPointF> points(qpoint_size);
  4.  
  5.     for(size_t i=0; i < qpoint_size; i++){
  6.        points[i].setX(i);
  7.        points[i].setY(c.getAvgHighTempVec().at(i));
  8.      }
  9.  
  10.     weatherStationGUI.draw(points);
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Qt Code: 
  1. //weatherstationgui.h
  2. namespace Ui {
  3. class weatherstationgui;
  4. }
  5. class weatherstationgui : public QMainWindow
  6. {
  7.     Q_OBJECT
  8.  
  9. public:
  10.     explicit weatherstationgui(QWidget *parent = 0);
  11.     ~weatherstationgui();
  12.  
  13.     void draw( QVector<QPointF>  dataIn);
  14.  
  15. private:
  16.     Ui::weatherstationgui *ui;
  17.  
  18.     QVector<QPointF>  wellData;
  19.  
  20. protected:
  21.     // paint method
  22.     void paintEvent(QPaintEvent *event);
  23. };
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Qt Code: 
  1. //weatherstationgui.cpp
  2. void weatherstationgui::draw(QVector<QPointF>  dataIn){
  3.    wellData = dataIn;
  4.    update();
  5. }
  6.  
  7. void weatherstationgui::paintEvent(QPaintEvent *event){
  8.  
  9.     // create a painter
  10.     QPainter painter(this);
  11.  
  12.     painter.drawPolyline(wellData.data(), static_cast<int>(wellData.size()));
  13. }
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In the debugger I can see 'wellData' indeed has the correct QPointF points values, but it just doesn't draw on the main window.

Is there anything wrong with my code?

Thanks