From e11c15fd04a8848a1fe695bfb1892571ff06deb5 Mon Sep 17 00:00:00 2001
From: David Moena <dmoena@gmail.com>
Date: Thu, 14 Jun 2012 17:53:20 -0400
Subject: [PATCH] added support for labelsKMG2 to handle very small numbers
 (mili, micro, nano...)

---
 dygraph-tickers.js   | 15 +++++++++++++++
 tests/labelsKMB.html | 11 ++++++++++-
 2 files changed, 25 insertions(+), 1 deletion(-)

diff --git a/dygraph-tickers.js b/dygraph-tickers.js
index b9815fe..20a7519 100644
--- a/dygraph-tickers.js
+++ b/dygraph-tickers.js
@@ -168,6 +168,7 @@ Dygraph.numericTicks = function(a, b, pixels, opts, dygraph, vals) {
   // Add formatted labels to the ticks.
   var k;
   var k_labels = [];
+  var m_labels = [];
   if (opts("labelsKMB")) {
     k = 1000;
     k_labels = [ "K", "M", "B", "T", "Q" ];
@@ -176,6 +177,7 @@ Dygraph.numericTicks = function(a, b, pixels, opts, dygraph, vals) {
     if (k) Dygraph.warn("Setting both labelsKMB and labelsKMG2. Pick one!");
     k = 1024;
     k_labels = [ "k", "M", "G", "T", "P", "E" ];
+    m_labels = [ "m", "u", "n", "p", "f", "a", "z", "y" ];
   }
 
   var formatter = opts('axisLabelFormatter');
@@ -199,6 +201,19 @@ Dygraph.numericTicks = function(a, b, pixels, opts, dygraph, vals) {
         }
       }
     }
+    if(opts("labelsKMG2")){
+      tickV = String(tickV.toExponential());
+      if(tickV.split('e-').length === 2 && tickV.split('e-')[1] >= 3){
+        if(tickV.split('e-')[1] % 3 > 0) {
+          label = Dygraph.round_(tickV.split('e-')[0] /
+              Math.pow(10,(tickV.split('e-')[1] % 3)),
+              opts('digitsAfterDecimal'));
+        } else {
+          label = Number(tickV.split('e-')[0]).toFixed(2);
+        }
+        label += m_labels[Math.floor(tickV.split('e-')[1] / 3) - 1];
+      }
+    }
     ticks[i].label = label;
   }
 
diff --git a/tests/labelsKMB.html b/tests/labelsKMB.html
index 0093b06..1a4d5c9 100644
--- a/tests/labelsKMB.html
+++ b/tests/labelsKMB.html
@@ -23,6 +23,9 @@
     <p>labelsKMG2 with yValueFormatter:</p>
     <div id="labelsKMG2yValueFormatter" style="width:600px; height: 300px;"></div>
 
+    <p>labelsKMG2 with very small numbers:</p>
+    <div id="labelsKMG2SmallNumbers" style="width:600px; height: 300px;"></div>
+
     <p>The curves are exponentials. Zooming in should reveal each of the 'K',
     'M', 'B', etc. labels.</p>
 
@@ -32,9 +35,10 @@
         return Math.round(num * shift)/shift;
       };
 
-      var data = [];
+      var data = [], smalldata = [];
       for (var i = 0, n = 1; i < 63; i++, n *= 2) {
         data.push([i, n]);
+        smalldata.push([i, Math.pow(10,-n)]);
       }
 
       var suffixes = ['', 'k', 'M', 'G', 'T'];
@@ -61,6 +65,11 @@
         yValueFormatter: formatValue,
         labels: ['Base', 'Power']
       });
+
+      var g4 = new Dygraph(document.getElementById("labelsKMG2SmallNumbers"), smalldata, {
+        labelsKMG2: true,
+        labels: ['Base', 'Power']
+      });
     </script>
   </body>
 </html>
-- 
2.7.4