From 8743766d218c41cfa19caa45e0686d102ba085f8 Mon Sep 17 00:00:00 2001
From: Andrew Pikul <ajpikul@gmail.com>
Date: Tue, 26 Dec 2023 01:48:56 -0300
Subject: [PATCH] Make tickmode proportional calculate reversed axes

---
 src/plots/cartesian/axes.js | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/src/plots/cartesian/axes.js b/src/plots/cartesian/axes.js
index 70f67a7fa8e..6ffed585e41 100644
--- a/src/plots/cartesian/axes.js
+++ b/src/plots/cartesian/axes.js
@@ -951,17 +951,17 @@ axes.calcTicks = function calcTicks(ax, opts) {
         if (mockAx.tickmode === 'array' ||  mockAx.tickmode === 'proportional') {
 
           // Mapping proportions to array:
-          var valsProp
-          var proportionalVals
-          var mappedVals
+          var valsProp, proportionalVals, mappedVals;
           var distance = maxRange - minRange;
+          if (axrev) distance *= -1;
           if (mockAx.tickmode === 'proportional') {
             valsProp = major ? Lib.nestedProperty(ax, "tickvals") : Lib.nestedProperty(ax.minor, "tickvals")
             proportionalVals = valsProp.get()
-            mappedVals = proportionalVals.map(function(v) { return minRange+(distance*v) })
+            mappedVals = proportionalVals.map(function(v) { return maxRange + (distance*v) })
             valsProp.set(mappedVals)
           }
-          // Original
+
+          // Original 'array' only code
           if(major) {
               tickVals = [];
               ticksOut = arrayTicks(ax);