clean kfet statistic.js

- no longer dictToArray where it isn't necessary (because already an
  array)
- fix chart height:
  - previous charts were causing bugs
  - height is fixed (even with window resizing)
- clean whitespaces

kfet/static/kfet/js/statistic.js

@@ -1,10 +1,10 @@
 (function($){
     window.StatsGroup = function (url, target) {
         // a class to properly display statictics
-        
+
         // url : points to an ObjectResumeStat that lists the options through JSON
         // target : element of the DOM where to put the stats
-        
+
         var self = this;
         var element = $(target);
         var content = $("<div>");
@@ -22,21 +22,21 @@
             return array;
         }
 
-        function handleTimeChart (dict) {
+        function handleTimeChart (data) {
             // reads the balance data and put it into chartjs formatting
-            var data = dictToArray(dict, 0);
+            chart_data = new Array();
             for (var i = 0; i < data.length; i++) {
                 var source = data[i];
-                data[i] = { x: new Date(source.at),
+                chart_data[i] = { x: new Date(source.at),
                             y: source.balance,
                             label: source.label }
             }
-            return data;
+            return chart_data;
         }
-        
+
         function showStats () {
             // CALLBACK : called when a button is selected
-            
+
             // shows the focus on the correct button
             buttons.find(".focus").removeClass("focus");
             $(this).addClass("focus");
@@ -50,14 +50,14 @@
 
             var chart_datasets = [];
             var charts = dictToArray(data.charts);
-            
+
             // are the points indexed by timestamps?
             var is_time_chart = data.is_time_chart || false;
 
             // reads the charts data
             for (var i = 0; i < charts.length; i++) {
                 var chart = charts[i];
-                
+
                 // format the data
                 var chart_data =  is_time_chart ? handleTimeChart(chart.values) : dictToArray(chart.values, 1);
 
@@ -77,6 +77,7 @@
             var chart_options =
                 {
                     responsive: true,
+                    maintainAspectRatio: false,
                     tooltips: {
                         mode: 'index',
                         intersect: false,
@@ -129,25 +130,25 @@
                     type: 'line',
                     options: chart_options,
                     data: {
-                        labels: dictToArray(data.labels, 1),
+                        labels: (data.labels || []).slice(1),
                         datasets: chart_datasets,
                     }
                 };
 
             // saves the previous charts to be destroyed
             var prev_chart = content.children();
-            
+
+            // clean
+            prev_chart.remove();
+
             // creates a blank canvas element and attach it to the DOM
-            var canvas = $("<canvas height='70'>");
+            var canvas = $("<canvas height='250'>");
             content.append(canvas);
 
             // create the chart
             var chart = new Chart(canvas, chart_model);
-            
-            // clean
-            prev_chart.remove();
         }
-        
+
         // initialize the interface
         function initialize (data) {
             // creates the bar with the buttons
@@ -158,7 +159,7 @@
 
             var to_click;
             var context = data.stats;
-            
+
             for (var i = 0; i < context.length; i++) {
                 // creates the button
                 var btn_wrapper = $("<div>",