code: function blockTicks (d) {
      const k = (d.end - d.start) / d.len
      return range(0, d.len, conf.ticks.spacing).map((v, i) => {
        return {
          angle: v * k + d.start,
          label: displayLabel(v, i)
        }
      })
    }
docs: Returns an array of tick angles and labels, given a block.