Build with support of negative fNdivisions

Author: linev

build/jsroot.js

@@ -14,7 +14,7 @@ const version_id = 'dev',
 
 /** @summary version date
   * @desc Release date in format day/month/year like '14/04/2022' */
-version_date = '10/03/2026',
+version_date = '8/04/2026',
 
 /** @summary version id and date
   * @desc Produced by concatenation of {@link version_id} and {@link version_date}
@@ -81644,8 +81644,12 @@ class JSRootMenu {
    addTAxisMenu(EAxisBits, painter, faxis, kind, axis_painter, frame_painter) {
       const is_gaxis = faxis._typename === clTGaxis;
 
-      this.add('Divisions', () => this.input('Set Ndivisions', faxis.fNdivisions, 'int', 0).then(val => {
-         faxis.fNdivisions = val; painter.interactiveRedraw('pad', `exec:SetNdivisions(${val})`, kind);
+      this.add('Divisions', () => this.input('Set Ndivisions', is_gaxis ? faxis.fNdiv : faxis.fNdivisions, 'int').then(val => {
+         if (is_gaxis)
+            faxis.fNdiv = val;
+         else
+            faxis.fNdivisions = val;
+         painter.interactiveRedraw('pad', `exec:SetNdivisions(${val})`, kind);
       }));
 
       if (kind !== 'v') {
@@ -82990,7 +82994,7 @@ const AxisPainterMethods = {
 
    /** @summary Produce axis ticks */
    produceTicks(ndiv, ndiv2) {
-      if (!this.noticksopt) {
+      if (!this.noticksopt && !this.exact_ticks) {
          const total = ndiv * (ndiv2 || 1);
 
          if (this.log)
@@ -83263,14 +83267,18 @@ class TAxisPainter extends ObjectPainter {
       else
          this.gr = this.func;
 
-      delete this.format;// remove formatting func
+      delete this.format; // remove formatting func
 
       let ndiv = 508;
       if (this.is_gaxis)
          ndiv = axis.fNdiv;
       else if (axis)
-         ndiv = axis.fNdivisions ? Math.max(axis.fNdivisions, 4) : 0;
+         ndiv = axis.fNdivisions;
 
+      this.exact_ticks = ndiv < 0;
+      if (this.exact_ticks)
+         ndiv = Math.abs(ndiv);
+      ndiv = Math.max(ndiv, 4);
       this.nticks = ndiv % 100;
       this.nticks2 = (ndiv % 10000 - this.nticks) / 100;
       this.nticks3 = Math.floor(ndiv / 10000);

changes.md

@@ -21,11 +21,12 @@
 1. Let define alternative draw function #378
 1. Implement padsN draw option for `THStack` and `TMultiGraph`
 1. Support custom click handler for `TGraph` https://root-forum.cern.ch/t/64744
+1. Correctly draw axis ticks when `fNdivisions` is negative
 1. Use `resvg-js` backend for PNG support in node.js #391, thanks to https://github.com/OmarMesqq
-1. Remove support for deprectaed `TH1K` class
 1. Introduce `settings.ServerTimeout` global timeout for THttpServer operations
 1. Let set custom color palette with `setColorPalette` function
 1. Upgrade three.js r180 -> r183
+1. Remove support for deprectaed `TH1K` class
 1. Fix - paint frame border mode/size from `TCanvas`
 1. Fix - interactivity for TH3 palette drawing #398
 

modules/core.mjs

@@ -6,7 +6,7 @@ const version_id = 'dev',
 
 /** @summary version date
   * @desc Release date in format day/month/year like '14/04/2022' */
-version_date = '10/03/2026',
+version_date = '8/04/2026',
 
 /** @summary version id and date
   * @desc Produced by concatenation of {@link version_id} and {@link version_date}