Antialiasing does not work with QGraphicsView
-
I have a simple application using Qt 5.0.1, it looks like:
@
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
m_Settings = new QSettings();// Create the tab widget to hold all the editable documents in the center/*
setTabPosition( Qt::AllDockWidgetAreas, QTabWidget::North );// Recent file action
for (int i = 0; i < MaxRecentFiles; ++i) {
m_RecentFileActions[i] = new QAction(this);
m_RecentFileActions[i]->setVisible(false);
connect(m_RecentFileActions[i], SIGNAL(triggered()),
this, SLOT(openRecentFile()));
}// Recent file menu
QMenu fileMenu = ui->menuFile;
m_SeparatorAction = fileMenu->addSeparator();
for (int i = 0; i < MaxRecentFiles; ++i)
fileMenu->addAction(m_RecentFileActions[i]);
updateRecentFileActions();
/
QGraphicsView view = new QGraphicsView( this );
view->setRenderHint( QPainter::HighQualityAntialiasing, true );
this->setCentralWidget( view );
view->setScene( new QGraphicsScene() );
QGraphicsScene theScene( view->scene() );
theScene->setSceneRect( -200, -200, 400, 400 );
QGraphicsLineItem* newItem = new QGraphicsLineItem();
theScene->addItem( newItem );
newItem->setLine( -50, -50, 30, 50 );
}MainWindow::~MainWindow()
{
delete ui;
}
@The line renders extremely ugly and aliased. Why is this?
Chris
-
This would have fixed it:
@
view->setRenderHints( QPainter::Antialiasing | QPainter::HighQualityAntialiasing );
@It appears that asking for high quality antialiasing doesn't imply that you want antialiasing which is kind of odd but it works and is really nice now.