Update charted to 0.4.8 and roll

packages/charted/lib/charts/cartesian_renderers/line_chart_renderer.dart

Index: packages/charted/lib/charts/cartesian_renderers/line_chart_renderer.dart
diff --git a/packages/charted/lib/charts/cartesian_renderers/line_chart_renderer.dart b/packages/charted/lib/charts/cartesian_renderers/line_chart_renderer.dart
index 4806d2d8c45c52ef70795607bf0a4c83c8c2a6c7..b904327b1c59322d5a71f1211a5a658cb93150c9 100644
--- a/packages/charted/lib/charts/cartesian_renderers/line_chart_renderer.dart
+++ b/packages/charted/lib/charts/cartesian_renderers/line_chart_renderer.dart
@@ -1,4 +1,3 @@
-//
 // Copyright 2014 Google Inc. All rights reserved.
 //
 // Use of this source code is governed by a BSD-style
@@ -12,6 +11,7 @@ class LineChartRenderer extends CartesianRendererBase {
   final Iterable<int> dimensionsUsingBand = const [];
 
   final bool alwaysAnimate;
+  final bool showHoverCardOnTrackedDataPoints;
   final bool trackDataPoints;
   final bool trackOnDimensionAxis;
   final int quantitativeScaleProximity;
@@ -30,6 +30,7 @@ class LineChartRenderer extends CartesianRendererBase {
 
   LineChartRenderer(
       {this.alwaysAnimate: false,
+      this.showHoverCardOnTrackedDataPoints: false,
       this.trackDataPoints: true,
       this.trackOnDimensionAxis: false,
       this.quantitativeScaleProximity: 5});
@@ -114,10 +115,10 @@ class LineChartRenderer extends CartesianRendererBase {
 
   @override
   void dispose() {
+    _disposer.dispose();
     if (root == null) return;
     root.selectAll('.line-rdr-line').remove();
     root.selectAll('.line-rdr-point').remove();
-    _disposer.dispose();
   }
 
   @override
@@ -166,7 +167,7 @@ class LineChartRenderer extends CartesianRendererBase {
     _trackingPointsCreated = true;
   }
 
-  void _showTrackingCircles(int row) {
+  void _showTrackingCircles(ChartEvent event, int row) {
     if (_trackingPointsCreated == false) {
       _createTrackingCircles();
     }
@@ -197,19 +198,31 @@ class LineChartRenderer extends CartesianRendererBase {
           ..setProperty('visibility', 'hidden');
       }
     });
+
+    if (showHoverCardOnTrackedDataPoints) {
+      var firstMeasureColumn = series.measures.first;
+      mouseOverController.add(new DefaultChartEventImpl(
+          event.source, area, series, row, firstMeasureColumn, 0));
+      _savedOverRow = row;
+      _savedOverColumn = firstMeasureColumn;
+    }
   }
 
-  void _hideTrackingCircles() {
+  void _hideTrackingCircles(ChartEvent event) {
     root.selectAll('.line-rdr-point')
       ..style('opacity', '0.0')
       ..style('visibility', 'hidden');
+    if (showHoverCardOnTrackedDataPoints) {
+      mouseOutController.add(new DefaultChartEventImpl(
+          event.source, area, series, _savedOverRow, _savedOverColumn, 0));
+    }
   }
 
   int _getNearestRowIndex(num x) {
-    var lastSmallerValue = 0;
+    double lastSmallerValue = 0.0;
     var chartX = x - area.layout.renderArea.x;
     for (var i = 0; i < _xPositions.length; i++) {
-      var pos = _xPositions[i];
+      double pos = _xPositions[i].toDouble();
       if (pos < chartX) {
         lastSmallerValue = pos;
       } else {
@@ -226,19 +239,24 @@ class LineChartRenderer extends CartesianRendererBase {
     _disposer.add(area.onMouseMove.listen((ChartEvent event) {
       if (area.layout.renderArea.contains(event.chartX, event.chartY)) {
         var row = _getNearestRowIndex(event.chartX);
-        window.animationFrame.then((_) => _showTrackingCircles(row));
+        window.animationFrame.then((_) {
+          _showTrackingCircles(event, row);
+        });
       } else {
-        _hideTrackingCircles();
+        _hideTrackingCircles(event);
       }
     }));
     _disposer.add(area.onMouseOut.listen((ChartEvent event) {
-      _hideTrackingCircles();
+      _hideTrackingCircles(event);
     }));
   }
 
   void _mouseClickHandler(d, int i, Element e) {
     if (area.state != null) {
-      area.state.select(int.parse(e.dataset['column']));
+      var selectedColumn = int.parse(e.dataset['column']);
+      area.state.isSelected(selectedColumn)
+          ? area.state.unselect(selectedColumn)
+          : area.state.select(selectedColumn);
     }
     if (mouseClickController != null && e.tagName == 'circle') {
       var row = int.parse(e.dataset['row']),