Ticks are unexpected with stepSize value.

[otistav]

Expected Behavior

Expect to see 5 equal ticks with same range value, defined in 'stepSize' property (in my case, 18)

Current Behavior

First tick has value of 16, then 4 ticks with value 18 and then last tick with value of 2.

Steps to Reproduce (for bugs)

Create linear chart with following configuration: https://codepen.io/otistav/pen/abOKvNG
stepSize property should be value (max - min) / 5 (I expect to see 5 equal intervals) and, probably, both of max and min properties should not be exactly divisible by stepSize (in my case, 20/18 != integer value and 110/18 != integer value)

Environment

• Chart.js version: 2.9.3
• Browser name and version: Chrome, v81.0.4044.69
• Link to your project: https://codepen.io/otistav/pen/abOKvNG

[kurkle]

Looks like the steps begin from 0 even though you have min defined.

[otistav]

Looks like the steps begin from 0 even though you have min defined.

Maybe there is some option to define start of ticks? Or this is unresolved issue?

[benmccann]

I wonder if perhaps niceNum is being called irrespective of whether the user passed in min and max values (though there are cases where that might be helpful. e.g. when the zoom plugin specifies min and max values)

Another way you could solve this is by specifying your own tick building function in the options:

           afterBuildTicks() {
             return [20, 38, 56, 74, 92, 110];
           }

[etimberg]

This is fixed in v3.0.0-alpha: https://jsfiddle.net/1tvhu4q8/

Edit: the fix was in #6966