Trying to set color

[ManiRon]

I am trying to draw an arc when we slide the slider i will draw the arc with Red color . Now when i set the backgroud color of the ui to black the arc which i draw is not visible. My code:

this->setStyleSheet("background-color:black;");
//this->setBackgroundRole(QPalette::Foreground);
QPainter p(this);
QPen pen;
pen.setWidth(10);
pen.setColor(Qt::red);
p.setPen(pen);

p.setRenderHint(QPainter::Antialiasing);

QRectF rectangle(ui->LB_Progress->x()-20, ui->LB_Progress->y()-20, 80.0, 80.0);
//to understand these magic numbers, look drawArc method in Qt doc
 int startAngle = -(270 * 16);
 int spanAngle =-(progress * 360 * 16);

p.drawArc(rectangle, startAngle, spanAngle);

p.drawText(rectangle,Qt::AlignCenter,QString::number(progress*100)+" %");

[SGaist]

Hi,

Why are you using a stylesheet since you do the painting yourself ?
Start by filling the widget in black and then paint the rest over it.

[ManiRon]

@SGaist said in Trying to set color:

how to do that sir,
I am not getting your point

[ManiRon]

@SGaist

Sir i used something like this and it worked

 QPalette pal(this->palette());
 QColor color(Qt::black);
 pal.setColor (QPalette::Background, color);
 this->setAutoFillBackground (true);
 this->setPalette(pal);

Instead of using stylesheet for filling background i used this type to fill my widget background.

[mrjj]

@ManiRon
Hi
Since you already have a paintEvent,
all you need to paint it black is
p.setBrush(Qt::black);
p.drawRect( rect () );