QBrush pattern problem

[jacek]

Indeed, it behaves strange. Especially when you resize the widget. It might be a result of some round-off errors, but IMO you should show this example to the Trolls.

Below is a working example:

#include <QApplication>
#include <QPainter>
#include <QWidget>
 
class Test : public QWidget
{
   protected:
      void paintEvent( QPaintEvent * )
      {
          QPainter painter(this);
          painter.setPen(Qt::red);
 
          QBrush brush(Qt:: Dense6Pattern);
          brush.setColor(Qt::blue);
          painter.setBrush(brush);
 
          painter.setWindow(0, 0, 1000, 1000); // try to comment out this line
          painter.drawRect(50, 50, 100, 200);
 
          painter.setWindow(0, 0, 2000, 2000);
          painter.drawRect(500, 100, 200, 400);
 
          painter.setWindow(0, 0, 3000, 3000);
          painter.drawRect(1350, 150, 300, 600);
 
          painter.setWindow(0, 0, 4000, 4000);
          painter.drawRect(2600, 200, 400, 800);
 
          painter.setWindow(0, 0, 5000, 5000);
          painter.drawRect(4250, 250, 500, 1000);
      }
};
 
int main( int argc, char **argv )
{
   QApplication app( argc, argv );
 
   Test t;
   t.show();
 
   return app.exec();
}

#include <QApplication>
#include <QPainter>
#include <QWidget>

class Test : public QWidget
{
   protected:
      void paintEvent( QPaintEvent * )
      {
          QPainter painter(this);
          painter.setPen(Qt::red);

          QBrush brush(Qt:: Dense6Pattern);
          brush.setColor(Qt::blue);
          painter.setBrush(brush);

          painter.setWindow(0, 0, 1000, 1000); // try to comment out this line
          painter.drawRect(50, 50, 100, 200);

          painter.setWindow(0, 0, 2000, 2000);
          painter.drawRect(500, 100, 200, 400);

          painter.setWindow(0, 0, 3000, 3000);
          painter.drawRect(1350, 150, 300, 600);

          painter.setWindow(0, 0, 4000, 4000);
          painter.drawRect(2600, 200, 400, 800);

          painter.setWindow(0, 0, 5000, 5000);
          painter.drawRect(4250, 250, 500, 1000);
      }
};

int main( int argc, char **argv )
{
   QApplication app( argc, argv );

   Test t;
   t.show();

   return app.exec();
}

To copy to clipboard, switch view to plain text mode