Fix problem with colz drawing

Use correct min/max values to estimate labels widths.
Still room for improvement

Author: linev

changes.md

@@ -1,7 +1,7 @@
 # JSROOT changelog
 
 ## Changes in master
-1. Let use HTML element pointer in JSROOT.draw function like:
+1.  Let use HTML element pointer in JSROOT.draw function like:
 
        JSROOT.draw(document.getElementsByTagName("div")[0], obj, "hist");
 
@@ -59,16 +59,16 @@
 8. Fix problem with GetBBox - it only can be used for visible elements in mozilla.    
 9. Support drawing of fit parameters in stat box, use (as far as possible) stat and
    fit format for statistic display 
-10.Implement 'g' formatting kind for stat box output - one need to checks 
-   significant digits when producing output.  
-11.Support new draw options for TGraph: 'C', 'B1', '0', '2', '3', '4', '[]'
-12.Primary support for STL containers in IO part. Allows to read ROOT6 TF1.
-13.Full support of TGraphBentErrors
-14.Support objects drawing from JSON files in default user interface, including
-   monitoring. One could open file from link like: 
-      https://root.cern.ch/js/dev/?json=demo/canvas_tf1.json 
-15.Introduce JSROOT.FFormat function to convert numeric values into string according
-   format like 6.4g or 5.7e. Used for statistic display.
+10. Implement 'g' formatting kind for stat box output - one need to checks 
+    significant digits when producing output.  
+11. Support new draw options for TGraph: 'C', 'B1', '0', '2', '3', '4', '[]'
+12. Primary support for STL containers in IO part. Allows to read ROOT6 TF1.
+13. Full support of TGraphBentErrors
+14. Support objects drawing from JSON files in default user interface, including
+    monitoring. One could open file from link like: 
+       https://root.cern.ch/js/dev/?json=demo/canvas_tf1.json 
+15. Introduce JSROOT.FFormat function to convert numeric values into string according
+    format like 6.4g or 5.7e. Used for statistic display.
 
 
 ## Changes in 3.5

scripts/JSRootPainter.js

@@ -6357,7 +6357,7 @@
       var axisfont = JSROOT.Painter.getFontDetails(axis['fLabelFont'], axis['fLabelSize'] * height);
 
       var ticks = d3.scale.linear().clamp(true)
-                  .domain([ this.minbin, this.maxbin ])
+                  .domain([ this.gminbin, this.gmaxbin ])
                   .range([ height, 0 ]).nice().ticks(axis['fNdiv'] % 100);
 
       var maxlen = 0;
@@ -6366,7 +6366,7 @@
          if (len > maxlen) maxlen = len;
       }
 
-      var rel = (maxlen + axisOffset) / width;
+      var rel = (maxlen + 5 + axisOffset) / width;
 
       if (pal['fX2NDC'] + rel > 0.98) {
          var shift = pal['fX2NDC'] + rel - 0.98;
@@ -6876,6 +6876,7 @@
       // check if we need to create palette
       if ((this.FindPalette() == null) && this.create_canvas && (this.options.Zscale > 0)) {
          // create pallette
+
          var shrink = this.CreatePalette(0.04);
          this.svg_frame().property('frame_painter').Shrink(0, shrink);
          this.svg_frame().property('frame_painter').Redraw();