Some clarification on qtableview cell geometry needed

[andi456]

Hi,

trying to taylor the stardelegate example to my needs, I'm struggling to get the geometry right. I created a rather simple shape (reminding of a wand) to replace the stars.

But, I guess, the procedure for creating the wand is a little too complicated for a qtableview cell or something like that. I filled to vector with cosine and sine values respectively to draw some radial rays so to say:

            QPen pen(Qt::black, 0.15); //in order to replace painter->drawPolygon(starPolygon, Qt::WindingFill);
            painter->setPen(pen);
            int h = rect.height() / (2 * PaintingScaleFactor);
            int w = rect.width() / (2 * PaintingScaleFactor);
            painter->translate(h, w);
            double grad = 135;
            painter->rotate(grad);
            for (unsigned int j=0; j<kosinusvec.size(); ++j) {
                QLineF l;
                l.setLine(kosinusvec[j], sinusvec[j], kosinusvec[j]*1.5, sinusvec[j])*1.5;
                painter->drawLine(l);
            }

This worked quite well for drawing on a single widget. But does seem to involve too much transformation for a viable result in a qtableview, I suppose.

Should I produce a image beforehand and then fit it into the cell or rather parts of it?

Kind regards,

Andreas

Edit: typos

[andi456]

To be clear: The shape is being drawn but a few lines down on the qtableview. So there must be something wrong with the coordinates.

[Christian Ehrlicher]

@andi456 said in Some clarification on qtableview cell geometry needed:

there must be something wrong with the coordinates.

painter->rotate(135);

Yes, you rotate the already translated painter so everything is painted down right

[andi456]

Ok, got rid of the transformations (rotate and translate), which does give better results, which still need some tinkering, however.

After some fiddling with the drawing, I finally got an acceptable result. Avoiding transformations seems to be a good advice, when it comes to drawings in table cells and similar entities.