Chart.js: Make minBarLength work for data that's only <= 0

[nielsjakob]

Feature Proposal

If I set minBarLength = 1 and I have a bar chart with data [0, 12.5], the first bar will be displayed as a very short bar:

If, however, my data is [0, -12.5], the first bar is invisible:

Feature Use Case

This would be great for bar charts that may display only data thats <= 0.

[nielsjakob]

This is how the minBarLength is drawn right now:

This is what I imagine might be better, although I feel that this might be rather complex to implement:

PS: This is weird: on desktop, the photos are rotated by 90° but not on mobile.. apologies for that

[kurkle]

Seems like its the opposite in master compared to latest

[benmccann]

The behavior on latest seems correct to me. The behavior on master does not

[kurkle]

Both seem incorrect to me, minBarLength should be min length in any direction.

[benmccann]

Isn't that what it is on latest? I don't understand what exactly is wrong about it

[kurkle]

Oh, I had messed with the pen. it had '-0.001' onstead of 0.

[etimberg]

For the behaviour on master, seems like we need to decide what to do when the value is the base value.

I think the most intuitive would be:

• base is value scale start: positive
• base is value scale end: negative
• base is in the middle (the samples above): go positive

@benmccann @kurkle how do you feel about solving this for v3? I think we should because it's gotten worse than v2.9.3

[fds-github]

When the base is in the middle, how about half above the base, half below?