Drawing Rectangle with only 2 corners rounded in Qt

Question

I am working on an application where I need to fill the color for the Pixmap using Painter. Pixmap is of type rectangle with (bottom edge) 2 rounded corners. Top 2 corners a

Answer 1

To extend the answer of Romha Korev. Here an example of a box with only rounded top corners (top left, top right). The rectangles in the corners are calculated based on the main rectangle!

qreal left = 5;
qreal top = 10;
qreal width = 100;
qreal height = 20;
QRectF rect(left, top, width, height);

QPainterPath path;
path.setFillRule( Qt::WindingFill );
path.addRoundedRect(rect, 5, 5 );
qreal squareSize = height/2;
path.addRect( QRect( left, top+height-squareSize, squareSize, squareSize) ); // Bottom left
path.addRect( QRect( (left+width)-squareSize, top+height-squareSize, squareSize, squareSize) ); // Bottom right
painter->drawPath( path.simplified() ); // Draw box (only rounded at top)

Answer 2

You can use QPainterPath for that :

    QPainterPath path;
    path.setFillRule( Qt::WindingFill );
    path.addRoundedRect( QRect(50,50, 200, 100), 20, 20 );
    path.addRect( QRect( 200, 50, 50, 50 ) ); // Top right corner not rounded
    path.addRect( QRect( 50, 100, 50, 50 ) ); // Bottom left corner not rounded
    painter.drawPath( path.simplified() ); // Only Top left & bottom right corner rounded

Answer 3

You can use stylesheets (on runtime or loading the file qss). You could manage to do it very easily:

QString str = "bottom-right-radius: 10px; top-right-radius: 0px....";
box->setStylesheet(str);

I suppose the box is a pixmap inside a QLabel ( label->setPixmap(...) )

OR

Set the object name to something (the label), and then use the

QLabel#name { bottom-right-radius: 10px... }

In a stylesheet you load.

Check this site out. It helps: http://border-radius.com/