Some helper functions needed for better scales.

diff --git a/src/Chart.Core.js b/src/Chart.Core.js
index 939fecf2910bcfea210ee2549db54ee1eadcfa58..f60d7c2e7e07672bda6ddcbbf906f5179bd755d2 100755 (executable)
--- a/src/Chart.Core.js
+++ b/src/Chart.Core.js
@@ -360,6 +360,9 @@
         toRadians = helpers.radians = function(degrees) {
             return degrees * (Math.PI / 180);
         },
+               toDegrees = helpers.toDegrees = function(radians) {
+                       return radians * (180 / Math.PI);
+               },
         // Gets the angle from vertical upright to the point about a centre.
         getAngleFromPoint = helpers.getAngleFromPoint = function(centrePoint, anglePoint) {
             var distanceFromXCenter = anglePoint.x - centrePoint.x,
@@ -479,6 +482,36 @@
             };
 
         },
+               // Implementation of the nice number algorithm used in determining where axis labels will go
+               niceNum = helpers.niceNum = function(range, round) {
+                       var exponent = Math.floor(Math.log10(range));
+                       var fraction = range / Math.pow(10, exponent);
+                       var niceFraction;
+                       
+                       if (round) {
+                               if (fraction < 1.5) {
+                                       niceFraction = 1;
+                               } else if (fraction < 3) {
+                                       niceFraction = 2;
+                               } else if (fraction < 7) {
+                                       niceFraction = 5;
+                               } else {
+                                       niceFraction = 10;
+                               }
+                       } else {
+                               if (fraction <= 1.0) {
+                                       niceFraction = 1;
+                               } else if (fraction <= 2) {
+                                       niceFraction = 2;
+                               } else if (fraction <= 5) {
+                                       niceFraction = 5;
+                               } else {
+                                       niceFraction = 10;
+                               }
+                       }
+                       
+                       return niceFraction * Math.pow(10, exponent);
+               },
         /* jshint ignore:start */
         // Blows up jshint errors based on the new Function constructor
         //Templating methods