From a72d5b4143226e55cdddd207f198f2e571496a52 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Christoph=20N=C3=B6lle?=
 <19640096+cnoelle@users.noreply.github.co>
Date: Tue, 23 Aug 2022 10:10:24 +0200
Subject: [PATCH] LineUtils: support decreasing axis ticks

---
 src/LineUtils.ts | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/LineUtils.ts b/src/LineUtils.ts
index 039c7ed..26dd329 100644
--- a/src/LineUtils.ts
+++ b/src/LineUtils.ts
@@ -193,6 +193,9 @@ class AxesMgmt {
     }
 
     private static _getTicks(valueRange: [number, number], numTicks: number): [Array<number>, number] {
+        const reverse: boolean = valueRange[0] > valueRange[1];
+        if (reverse)
+            valueRange = [valueRange[1], valueRange[0]];
         const length: number = Math.abs(valueRange[1] - valueRange[0]);
         const l: number = length/(numTicks-1);
         const tenBase: number = Math.round(Math.log(l) / AxesMgmt._LOG_10); // log with base 10 of l
@@ -212,6 +215,8 @@ class AxesMgmt {
             start += proposedDistance;
         }
         const decimals = proposedDistance >= 1 ? 0 : -Math.floor(Math.log(proposedDistance)/AxesMgmt._LOG_10);
+        if (reverse)
+            ticks.reverse();
         return [ticks, decimals];
     }