// draw the controller with all its arcs
void ArcBall::draw (double aspect)
{
if(dragging)
drawOuterRing(); // draw edges
drawResultArc();
drawConstraints();
drawDragArc();
}
void ColorWheel::paintEvent(QPaintEvent*) {
QPainter painter(this);
painter.setRenderHint(QPainter::Antialiasing);
QStyleOption opt;
opt.initFrom(this);
// use the following lines to obtain the background color of the widget
//QBrush background = opt.palette.window();
//wheel.fill(background.color());
drawOuterRing(painter);
painter.drawImage(squareRegion_.boundingRect(), squareImage_);
drawIndicator(painter);
drawPicker(painter);
style()->drawPrimitive(QStyle::PE_Widget, &opt, &painter, this);
}
