Colours used: ticks to match bin boundaries

[rolyp]

Y-axis ticks should match bin boundaries. Might have to draw these manually, since there isn't a way to get at the bin boundaries (unless you set them yourself, in which case you know them already).

• experiment with using mark_tick and encode to draw ticks
• set ticks to reasonable width ❌ minimum width is too thick 🤦
• try mark_line ❌ same problem with line thickness
• try strokeWidth instead of thickness ❌ same problem
• try mark_rect and set y2 to y + 1 ❌ y is domain units, so 1 typically inappropriate value

[rolyp]

@edwardchalstrey1 Just to report on my experiments with this last week: I was able to use mark_line and mark_tick to implement our own tick marks. However, using strokeWidth or thickness I wasn't able to make the line thin enough for it to serve as a tick mark. My guess is that these are intended as "plotting" features, not axis-rendering features, and by design are drawn with a minimum thickness.

I also tried mark_rect to draw a "small rectangle" in lieu of a tick. This doesn't quite work either: it's not clear what to set the height of the rectangle to be (which must be expressed in units corresponding to the data domain). If it's too small, then the rectangle doesn't render at all (it doesn't have a minimum visual height of, say, 1 pixel).

Summary: this may also turn out to be a hard-to-resolve problem.

[edwardchalstrey1]

have removed bug as this doesn't break anything, think design-challenge more appropriate here!

[rolyp]

@edwardchalstrey1 Makes sense to me!