Scatter (sometimes) draw line incorrectly through markers

[eulerreich]

If I zoom in on a scatter plot of 'markers+lines', sometimes the line isn't drawn correctly through the markers.

I've been having this issue since before 1.9.x and now I'm on 1.9.3 and it's still there.

[etpinard]

Copied from https://github.com/plotly/plotly.js/blob/master/CONTRIBUTING.md#opening-issues :

Bug reports must be accompanied with a reproducible example. We recommend using
codepen, jsfiddle or jsbin to share your example.

[etpinard]

@eulerreich or in your case a reproducible python code snippet OR a https://plot.ly URL.

[eulerreich]

Here's an URL

[etpinard]

@eulerreich that plot is private. Could you share it with me at etienne@plot.ly. Thanks.

[etpinard]

@eulerreich Looks like you have (maybe accidentally) deleted the plot's associated grid or made it private. I can't see your graph's data.

[eulerreich]

I realized that and sent you a second copy of it? Did you get that second
one?
On Dec 18, 2015 3:13 PM, "Étienne Tétreault-Pinard" <
notifications@github.com> wrote:

@eulerreich https://github.com/eulerreich Looks like you have (maybe
accidentally) deleted the plot's associated grid or made it private. I
can't see your graph's data.

—
Reply to this email directly or view it on GitHub
#108 (comment).

[etpinard]

@eulerreich Could you resend me the working copy?

[eulerreich]

I just resent it.

On Mon, Dec 21, 2015 at 8:47 AM, Étienne Tétreault-Pinard <
notifications@github.com> wrote:

@eulerreich https://github.com/eulerreich Could you resend me the
working copy?

—
Reply to this email directly or view it on GitHub
#108 (comment).

[etpinard]

@eulerreich Bug confirmed (in both the latest Chrome and Firefox). Thanks for this report.

Here's a minimal example showing the bug: http://codepen.io/etpinard/pen/KVNwQR

No obvious reason why this bug could happen comes to mind.

Maybe some rounding error in the line decimation algorithm (cc @alexcjohnson ) ?

Note that hover picks out the 'correct' value:

With mode: 'markers+lines':

With mode: 'lines':

[etpinard]

fixed via #353