FastLine - Gaps in the line

[Loz]

I've just updated the source from the version released on 23rd September 2008 to the latest version.

It was a fairly smooth update but there seems to be a change in how the FastLine series is being rendered. It may well be a new feature / property that's been added that I need to change.

It's causing series data that has many data points to be rendered in a non-continuous way causing gaps in the line. It used to work fine. When I zoom in it's all ok, but in zooming back out the gaps re-appear.

I've uploaded a screenshot of both a small and larger chart that shows the problem.

[Sandra]

Hello Loz,


I could see your issue in the imatges, but we needs a simple example for reproduce problem here.

Please, could you send us a simple example project we can run "as-is" to reproduce the problem here?You can either post your files at news://www.steema.net/steema.public.attachments newsgroup or at our upload page.



Thanks,

[Loz]

I have found that it's caused by FastLine.DrawAllPoints being set to false.

It's always been set this way. I assumed it worked out which points needed to be drawn depending on the resolution and this helped with performance.

This is the first time we've seen a change in the behaviour.

I'm still investigating but I noticed there was a variable called DrawBetweenPoints but it does seem to be enabled. I’ll keep looking into it.

If I set DrawAllPoints to true it does work but it doesn’t look as good as it did previously and I suspect it may be slower.

[Loz]

I've also noticed there's a new function called IsNewPixelPosition within FastLine.cs

My guess is that the method used to determine which pixels are drawn for a given x , y at the given chart / screen resolution has changed. I thought to begin with that a function linking each of the pixels together is missing but it doesn't look to be as simple as that.

I'm uploading a test app written using Studio 2008 now.

[Yeray]

Hi Loz,

Yes you are right. I've added it to the wish list to be fixed asap (TF02014122).

[Loz]

I've just seen that a major new version has been released.

Will the bug we've identified be fixed in version 3.5x or will fixes only be done in the new version 4.x?

[Narcís]

Hi Loz,

v3 update builds with some bug fixes will still be published. However, at the present moment, I'm not able to tell you when this will be fixed and in which version. I recommend you to be aware at this forum or subscribe to our RSS news feed for new release announcements and which bugs are fixed on each release.