plotly_custom_tick_labels.nim

import plotly, random, sequtils
import json # to modify json
import strformat # to format the tick texts

# let's assume the 28 correspond to 28 inches and we want to print the
# x axis values in pixels using a dpi of 72.27
var zs = newSeqWith(28, newSeq[float32](28))
for x in 0 ..< 28:
  for y in 0 ..< 28:
    zs[x][y] = rand(1.0)

# create a heatmap and convert to a `PlotJson` object
let plt = heatmap(zs).toPlotJson
# replace the existing layout["xaxis"] with custom vals
plt.layout["xaxis"] = %* {
  "tickvals" : toSeq(0 .. 27),
  "ticktext" : toSeq(0 .. 27).mapIt(&"{it.float * 72.27:.2f}"),
  "title" : "inches -> pixels"
}
plt.show()