How to eliminate unwanted lines in line chart? (bug)

[fogcity]

I've got a strange problem with unwanted horizontal lines in my line chart:

http://jsfiddle.net/8LJwx/

Note that the problem goes away when i remove the ROTATION parameter from the x-axis labels,
OR when i remove the CATEGORIES parameter from the x-axis labels.

It's hard to debug this problem when it goes away when I remove seemingly unrelated parameters.

It looks like a bug?

Here is another test case, I can't seem to get rid of the extra lines no matter what i change:

http://jsfiddle.net/8Nr46/

[levipage]

http://jsfiddle.net/8Nr46/18/

Getting rid of tickPixelInterval seems to solve the problem for me. But yeh, looks like a bug. The tickPixelInterval parameter is mostly useless since it ignores it most of the time anyway.

[levipage]

I take that back actually... once I changed the chart height the problem showed up again:
http://jsfiddle.net/8Nr46/22/

[fogcity]

Sounds like this is a bug? Any idea when it might be fixed?

[hfrntt]

In your examples - if you enable chart title it'll look correct. I reported an issue here: https://github.com/highslide-software/h ... /issue/150

[fogcity]

Thanks for being so responsive. It's great working with a product that's so well supported.

[fogcity]

In your examples - if you enable chart title it'll look correct. I reported an issue here: https://github.com/highslide-software/h ... /issue/150

note that the above mentioned page includes a link to an example of the problem, but the link appears to be incorrect.

[fogcity]

In your examples - if you enable chart title it'll look correct. I reported an issue here: https://github.com/highslide-software/h ... /issue/150

Update:

It doesn't look like enabling the chart title is a valid workaround to the problem.

Here is an example of a chart with the problem. It has the default chart title:

http://jsfiddle.net/bfQeJ/985/

Another example of a chart with the problem. It has a specific (non-empty) chart title:

http://jsfiddle.net/bfQeJ/986/

Any idea when this might get fixed?

[torstein.honsi]

The chart title itself isn't directly related to the issue - the problem is to find the right number of ticks for the given plot height. When toggling the chart title, in your example you hit a blind spot where the algorithm breaks. It only happens when using multiple (unlinked) axes. We'll try to fix this before the next maintenance release.

[RMillard]

Whilst not the cause above using startOnTick: false, for multiple y axis results in additional lines also.

[fogcity]

We'll try to fix this before the next maintenance release.

Looks like this was not fixed in the latest release. Any idea when a fix will be made available?

[fogcity]

bump

[levipage]

bump

Apparently making new chart types is more important than fixing existing ones that don't work correctly. Very frustrating.

[fogcity]

while i am frustrated about this bug, it's mostly because it's basically the only blemish that remains on an otherwise stellar product. so i don't resent the appearance of new features (some of which i have used myself) even though this bug remains unfixed. for the cost (free or close to free), highcharts is a stellar software package and the support is better than many products i've worked with that cost far more.

that said, this should really be fixed some time soon

[torstein.honsi]

It's a bit hard to understand this issue - we can't just increase the number of ticks on the linked axis, as it will cause the extremes to become wrong. And we currently don't have a way to force it into a certain number of ticks. In theory it could cause the linked axis to have ticks like 0, 16.67, 33.33 etc.

Instead I recommend you hide the grid lines on the linked axis by setting gridLineWidth to 0: http://jsfiddle.net/highcharts/bfQeJ/1750/