QwtDial - multiple Background color

[Maximus2]

Hi guys,

Here is my current QwtDial
Here is what I would like (forgive my painting skills)

I can put one color that fit the circle totally but I'm failing at using multiple color at the same time.

QPalette palette;
palette.setColor( QPalette::WindowText, QColor(89, 130, 67) );   //GREEN 90-270
palette.setColor( QPalette::WindowText, QColor(35, 53, 216) );   //BLUE 0-90
palette.setColor( QPalette::WindowText, QColor(168, 18, 18) );   //RED 270-360

QPalette palette;
palette.setColor( QPalette::WindowText, QColor(89, 130, 67) );   //GREEN 90-270
palette.setColor( QPalette::WindowText, QColor(35, 53, 216) );   //BLUE 0-90
palette.setColor( QPalette::WindowText, QColor(168, 18, 18) );   //RED 270-360

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I'm using the DialBox example modified for my need found in the qwt/examples
Thanks if you can give a hand to a Qwt newbie!

[Uwe]

You have to overload drawScaleContents using QPainter::drawPie().

Uwe

[Maximus2]

Thanks for your answer, I will try that and post the resulting code when it's working

[Edit]

Got it to work, QPainter is really powerfull ! (see code below)

//////////////////////////////////////////////////////////////////////////////////////////////////
/*!
  Draw the contents inside the scale
  Paints nothing.
 
  \param painter Painter
  \param center Center of the contents circle
  \param radius Radius of the contents circle
*///////////////////////////////////////////////////////////////////////////////////////////////////
void myQwtDial::drawScaleContents( QPainter *painter, const QPointF &center, double radius ) const {
 
 
 
    qDebug() << "X: " << center.x() << "Y : " << center.y();
    qDebug() << "RADIUS" << radius;
 
 
    QRectF rectangle(center.x()-radius, center.y()-radius, radius*2, radius*2);
 
 
    painter->setBrush(QBrush(Qt::darkGreen));
    painter->drawPie(rectangle, (0 * 16), (180 * 16) );
 
    painter->setBrush(QBrush(Qt::blue));
    painter->drawPie(rectangle, (180 * 16), (90 * 16) );
 
    painter->setBrush(QBrush(Qt::red));
    painter->drawPie(rectangle, (270 * 16), (90 * 16) );
 
}

//////////////////////////////////////////////////////////////////////////////////////////////////
/*!
  Draw the contents inside the scale
  Paints nothing.

  \param painter Painter
  \param center Center of the contents circle
  \param radius Radius of the contents circle
*///////////////////////////////////////////////////////////////////////////////////////////////////
void myQwtDial::drawScaleContents( QPainter *painter, const QPointF &center, double radius ) const {



    qDebug() << "X: " << center.x() << "Y : " << center.y();
    qDebug() << "RADIUS" << radius;


    QRectF rectangle(center.x()-radius, center.y()-radius, radius*2, radius*2);


    painter->setBrush(QBrush(Qt::darkGreen));
    painter->drawPie(rectangle, (0 * 16), (180 * 16) );

    painter->setBrush(QBrush(Qt::blue));
    painter->drawPie(rectangle, (180 * 16), (90 * 16) );

    painter->setBrush(QBrush(Qt::red));
    painter->drawPie(rectangle, (270 * 16), (90 * 16) );

}

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[Maximus2]

Last questions,

1- Would it be possible to cut the QwtDial in half like this?

2- Would it be possible to hide the black line in the circle, see example here, I guess QPainter add it automatically when using drawPie()?
[ANSWER : Use "painter->setPen( Qt::NoPen )" on your painter, simple!]

Thank you!