How to draw a rect with only the bottom left border rounded?

[Ylvy]

How i could draw a rounded rect where only its bottom-left border has a radius of 8px?

My attempt resulted in this weird thing:

I'm trying to achieve something like this (without stylesheet)

class Widget : public QWidget
{
public:
    Widget(QWidget* parent) : QWidget(parent) {};
protected:

    void paintEvent(QPaintEvent *event) override 
    {
        QPainter painter(this);
        painter.setRenderHint(QPainter::Antialiasing, true);

        QRect rect(100, 100, 300, 100);
        QPainterPath path;
        path.moveTo(rect.left(), rect.top());

        path.lineTo(rect.right(), rect.top());
        path.lineTo(rect.right(), rect.bottom());
        path.lineTo(rect.left() + 8, rect.bottom());
        path.arcTo(QRectF(rect.bottomLeft() - QPointF(0, 8), QSizeF(16, 16)), 90, 90);
        path.lineTo(rect.left(), rect.top());

        painter.setPen(Qt::red);
        painter.setBrush(Qt::black);
        painter.drawPath(path);
    }
};

[Ylvy]

I got it working, only the bottom left corner rounded:

path.moveTo(mrect.bottomLeft() + QPointF(borderRadius, 0));
path.lineTo(mrect.bottomRight());
path.lineTo(mrect.topRight());
path.lineTo(mrect.topLeft());
path.lineTo(mrect.bottomLeft() + QPointF(0, -borderRadius));
path.quadTo(mrect.bottomLeft(), mrect.bottomLeft() + QPointF(borderRadius, 0));

[mpergand]

@Ylvy
try for angles (not tested)
-45, -225

path.moveTo(rect.left(), rect.top());
path.lineTo(rect.right(), rect.top());
path.lineTo(rect.right(), rect.bottom());
path.lineTo(rect.left() +16, rect.bottom());
path.arcTo(QRectF(rect.bottomLeft() +QPoint(0,-16), QSizeF(16,16)), -90,-90);
path.lineTo(rect.left(), rect.top());

[Ylvy]

I got it working, only the bottom left corner rounded:

path.moveTo(mrect.bottomLeft() + QPointF(borderRadius, 0));
path.lineTo(mrect.bottomRight());
path.lineTo(mrect.topRight());
path.lineTo(mrect.topLeft());
path.lineTo(mrect.bottomLeft() + QPointF(0, -borderRadius));
path.quadTo(mrect.bottomLeft(), mrect.bottomLeft() + QPointF(borderRadius, 0));