dynamically remove data from chart. Auto rotate x-scale labels.

Author: aaronhayes

lib/core.js

@@ -43,6 +43,7 @@ module.exports = {
         dataKey = dataKey || dataKeys[chart.name];
         updatePoints(nextProps, chart, dataKey);
         chart.scale.xLabels = nextProps.data.labels;
+        chart.scale.calculateXLabelRotation();
         chart.update();
       }
     };
@@ -92,6 +93,9 @@ var updatePoints = function(nextProps, chart, dataKey) {
       chart.segments[segmentIndex].value = segment.value;
     });
   } else {
+    while (chart.scale.xLabels.length > nextProps.data.labels.length) {
+      chart.removeData();
+    }
     nextProps.data.datasets.forEach(function(set, setIndex) {
       set.data.forEach(function(val, pointIndex) {
         if (typeof(chart.datasets[setIndex][dataKey][pointIndex]) == "undefined") {