Issues when upgrading Qwt from 6.0.2 to 6.1.0

[freshairfly]

Hi All,

First of all, Qwt is an excellent plot library.
I met two issues when I'm trying upgrade qwt from 6.0.2 to 6.1.0.
1. X axis zoom only (see pic please). I overwritten drawRubberBand of QwtPlotZoomer. But it doens't work with Qwt-6.1.0.
zoomer.png

void TrendPlotZoomer::drawRubberBand(QPainter* painter) const
{
    const QPolygon pa = adjustedPoints(pickedPoints());
    if (pa.count() < 2)
        return;
 
    const QPoint& p1 = pa.first();
    const QPoint& p2 = pa.last();
 
    QRect rect = QRect(p1, p2).normalized();
    QRectF prect = pickArea().boundingRect();
    rect.setY(prect.y());
    rect.setHeight(prect.height());
 
    if (painter->pen().color() != Qt::color1) {
 
        QColor color = painter->pen().color();
        color.setAlpha(50);
        painter->setBrush(color);
    }
    else {
        painter->setBrush(painter->pen().color());
    }
 
    QwtPainter::drawRect(painter, rect);
}

void TrendPlotZoomer::drawRubberBand(QPainter* painter) const
{
    const QPolygon pa = adjustedPoints(pickedPoints());
    if (pa.count() < 2)
        return;

    const QPoint& p1 = pa.first();
    const QPoint& p2 = pa.last();

    QRect rect = QRect(p1, p2).normalized();
    QRectF prect = pickArea().boundingRect();
    rect.setY(prect.y());
    rect.setHeight(prect.height());

    if (painter->pen().color() != Qt::color1) {

        QColor color = painter->pen().color();
        color.setAlpha(50);
        painter->setBrush(color);
    }
    else {
        painter->setBrush(painter->pen().color());
    }

    QwtPainter::drawRect(painter, rect);
}

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2. How to hide the frame line of canvas in 6.1.0?
With 6.0.2, I did like this:

canvas()->setLineWidth(0);
    canvas()->setFrameStyle(QFrame::StyledPanel | QFrame::Plain);

canvas()->setLineWidth(0);
    canvas()->setFrameStyle(QFrame::StyledPanel | QFrame::Plain);

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Althrough the canvas is an instance of QFrame, I want to how to turn off the frame line elegantly.

[Uwe]

1. X axis zoom only (see pic please). I overwritten drawRubberBand of QwtPlotZoomer. But it doens't work with Qwt-6.1.0..

What exactly means "doesn't work" ?

2. How to hide the frame line of canvas in 6.1.0?

In Qwt 6.1 you can have a QwtPlotCanvas or a QwtPlotGLCanvas, where QWidget is the common base class. That's why QwtPlot::canvas() returns a QWidget now.
You might use use a dynamic_cast - or like it is done in the examples:

QwtPlotCanvas *canvas = new QwtPlotCanvas();
canvas->setXYZ(...);
 
plot->setCanvas( canvas );

QwtPlotCanvas *canvas = new QwtPlotCanvas();
canvas->setXYZ(...);

plot->setCanvas( canvas );

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Uwe

[freshairfly]

Uwe,

Thanks for your reply.
"Doesn't work" means doesn't draw the "rubber band" same as 6.0.2.
To zoom on X axis only, when user dragging the mouse, the "Rubber Band" should be full of canvas on Y direction with semitransparent background (just like the pic of previsous post).

The code I posted previous did work as I expected. But when I upgrade the Qwt to 6.1.0. The "Rubber Band" looks like this:
zoomer_new.png
I debug the code, and I found setClipPath&setClipRect in QwtWidgetOverlay should be the reason. So my question is how to draw the "Rubber Band" same as Qwt6.0.2 exactly.

[freshairfly]

Uwe,

The issue was resolved via overwritting the rubberBandMask() of the zoomer.

Thanks again.