qgraphicscene mac ppc 10.4渲染错误,rects隐藏后面的行?

当你加入…然后添加行…对于一个qgraphicscene,你会期望直线被画在矩形上,对吧?在qt 4.4.3,mac ppc 10.4.11中, 一些 在下面的测试用例中,行不是。我想这是一个qt/mac库/显卡交互 所以,如果能说“干净的……”,任何人都会感激的。
谢谢,干杯

// QGraphicsScene mac rendering bug: some addLines are hidden by previous addRects
    // C: 150 line is hidden under most rects, others ok
    // pyqt: other lines are hidden
// qt-mac-opensource-src-4.4.3 PyQt-mac-gpl-4.4.4 macosx 10.4.11, ppc, GEForce2 mx
// denis-bz-gg@t-online.de 9jun

#include <cmath>
#include <QtGui>

int main( int argc, char* argv[] )
{
    qDebug() << "qVersion:" << qVersion();
    QApplication app( argc, argv );
    int Size = 10;  // changes what's hidden
    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( 100, 100 );  // ?

    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();
}