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Ugly rendering in WCartesianChart
Added by Manuel Weichselbaumer over 1 year ago
Hi there,
i already noticed that a WCartesianChart renders fonts and lines in a worse quality than in a regular WPaintedWidget where i override:
void paintEvent(Wt::WPaintDevice *paintDevice)
I tried to override WCartesianChart::paintEvent() where i do my custom drawing like i did in a regular WPaintedWidget. However, quality is much worse in WCartesianChart.
Is there a different renderer used? How could i overcome this?
BR
Manuel
I checked the anti-aliasing setting and tried all combinations. I also tried several browser combinations. However, all with the same effect.
You can have a closer look, to the bars i am trying to render.
On the left side, it is the WCartesianChart, where i draw the bars to. On the right, the bars (test and icons) are drawn using WPaintedWidget.
As you can see, the text is also rendered blurry (in contrast to the other texts next to the icons).
Is there any kind of scaling happening? Is it also blurry when you do right click -> save image as and then view the resulting PNG file at 100% scaling?
The chart is placed within a BoxLayout. I now set the size to a fixed size using the resize() call.
There is something else: the brush of the graph (semi-transparent orange area) is not always painted. So, depending in the browser window size the filling gets painted or not (only for chrome. working with safari, though).
Saving as PNG only works for me when using Chrome. The Png does not look blurry, however resolution seems to be too low.
Yes, apparently, there is some kind of scaling applied. However, i cannot figure out, what the difference with WPaintedWidget is...