[PyQt] Re: QGraphicsScene addLine, addRect draw order scrambled in Qt 4.4.3 on mac ?

denis denis-bz-py at t-online.de
Tue Jun 9 10:41:37 BST 2009


bug: some addLines are hidden by previous addRects in Qt 4.4.3 + mac too,
differently in C and PyQt.  The C testcase is below, please forward
(Nokia doesn't seem to respond to bugs that don't show up on handys :)
Thanks, cheers

// QGraphicsScene: some addLines are hidden by previous addRects
    // C: 150 line under most rects, others ok
    // pyqt: 0 120 150
// qt-mac-opensource-src-4.4.3 PyQt-mac-gpl-4.4.4 macosx 10.4.11, ppc, GEForce2
// denis-bz-py at t-online.de 9jun

#include <cmath>
#include <QtGui>

int main( int argc, char* argv[] )
{
    qDebug() << "qVersion:" << qVersion();
    QApplication app( argc, argv );
        // zz.eqargs( ++ argv );  // args test=1 x=3 ... => Zval( x ) ...
    int Size = 10;
    int x0 = -500, y0 = -500, x1 = 500, y1 = 500;
    QRectF scenerect( x0, y0, x1, y1 );
    QGraphicsScene* scene = new QGraphicsScene( scenerect );
    QGraphicsView* view = new QGraphicsView( scene );
    view->centerOn( 0, 0 );  // ?

    for( int j = x0/2;  j < x1/2;  j += Size ){
    for( int k = y0/2;  k < y1/2;  k += Size ){
        scene->addRect( j, k, Size-1, Size-1, Qt::NoPen, QBrush( "palegreen" ));
    }
    }
    for( int angle = 0;  angle < 180;  angle += 30 ){
        float c = cos( angle * M_PI / 180 ) * x1;
        float s = sin( angle * M_PI / 180 ) * y1;
        scene->addLine( -c, -s, c, s, QPen( "black" ));
    }

    view->show();
    return app.exec();
}






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