Hello,I have a problem in use of Qt::ConicalGradientPattern.please help me.thank you very very much.
Qt Code: 
  1. #ifndef PAINT_H
  2. #define PAINT_H
  3.  
  4. #include <QtWidgets>
  5.  
  6. class Lines : public QWidget
  7. {
  8.   Q_OBJECT
  9.  
  10.   public:
  11.     Lines(QWidget *parent = 0);
  12.  
  13.   protected:
  14.     void paintEvent(QPaintEvent *event);
  15.     void drawLines(QPainter *qp);
  16.  
  17. };
  18. #endif // PAINT_H
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Qt Code: 
  1. #include "lines.h"
  2. #include <QPainter>
  3.  
  4.  
  5. Lines::Lines(QWidget *parent)
  6.     : QWidget(parent)
  7. {
  8.  
  9. }
  10.  
  11. void Lines::paintEvent(QPaintEvent *e)
  12. {
  13.   Q_UNUSED(e);
  14.   QPainter qp(this);
  15.   drawLines(&qp);
  16. }
  17.  
  18. void Lines::drawLines(QPainter *qp)
  19. {QPen pen(Qt::black, 100, Qt::SolidLine);
  20. qp->fillRect(500,500,200,200,Qt::ConicalGradientPattern	);
  21. qp->setPen(pen);
  22. qp->drawLine(100,100,100,100);
  23.  
  24. }
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The error is: QBrush: Wrong use of a gradient pattern