Roll Observatory packages and add a roll script

charted/lib/charts/behaviors/mouse_tracker.dart

Index: charted/lib/charts/behaviors/mouse_tracker.dart
diff --git a/charted/lib/charts/behaviors/mouse_tracker.dart b/charted/lib/charts/behaviors/mouse_tracker.dart
deleted file mode 100644
index 822a278209e3b5593153a1fc6bf10c919b926061..0000000000000000000000000000000000000000
--- a/charted/lib/charts/behaviors/mouse_tracker.dart
+++ /dev/null
@@ -1,120 +0,0 @@
-//
-// Copyright 2014 Google Inc. All rights reserved.
-//
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file or at
-// https://developers.google.com/open-source/licenses/bsd
-//
-
-part of charted.charts;
-
-/// A behavior that tracks mouse pointer and paints a dashed line to
-/// the axes from the current pointer location.
-class MouseTracker implements ChartBehavior {
-  ChartArea _area;
-  Rect _rect;
-
-  Element _markerX;
-  Element _markerY;
-
-  bool _showMarkerX = true;
-  bool _showMarkerY = true;
-  bool _showing;
-
-  Element _lower;
-
-  StreamSubscription _mouseMoveSubscription;
-  StreamSubscription _mouseInSubscription;
-  StreamSubscription _mouseOutSubscription;
-
-  void init(ChartArea area, Selection upper, Selection lower) {
-    _area = area;
-    _lower = lower.first;
-
-    if (area is CartesianArea) {
-      _mouseInSubscription = _area.onMouseOver.listen(_show);
-      _mouseOutSubscription = _area.onMouseOut.listen(_hide);
-    }
-  }
-
-  void dispose() {
-    if (_mouseInSubscription != null) _mouseInSubscription.cancel();
-    if (_mouseOutSubscription != null) _mouseOutSubscription.cancel();
-    if (_mouseMoveSubscription != null) _mouseOutSubscription.cancel();
-    if (_markerX != null) _markerX.remove();
-    if (_markerY != null) _markerY.remove();
-  }
-
-  void _show(ChartEvent e) {
-    if (_mouseMoveSubscription != null) return;
-    _create();
-    _visibility(true);
-    _mouseMoveSubscription = _area.onMouseMove.listen(_update);
-  }
-
-  void _hide(ChartEvent e) {
-    if (_showing != true) return;
-    _visibility(false);
-    _mouseMoveSubscription.cancel();
-    _mouseMoveSubscription = null;
-  }
-
-  void _visibility(bool show) {
-    if (_showing == show) return;
-    var value = show ? 'visible' : 'hidden';
-    if (_markerX != null) {
-      _markerX.style.visibility = value;
-    }
-    if (_markerY != null) {
-      _markerY.style.visibility = value;
-    }
-  }
-
-  bool _isRenderArea(ChartEvent e) =>
-      _rect != null && _rect.contains(e.chartX, e.chartY);
-
-  void _create() {
-    if (_rect == null) {
-      var renderArea = _area.layout.renderArea;
-      _rect = new Rect(
-          renderArea.x, renderArea.y, renderArea.width, renderArea.height);
-    }
-    if (_showMarkerX && _markerX == null) {
-      _markerX = new LineElement();
-      _markerX.attributes
-        ..['x1'] = '0'
-        ..['y1'] = _rect.y.toString()
-        ..['x2'] = '0'
-        ..['y2'] = (_rect.y + _rect.height).toString()
-        ..['class'] = 'axis-marker axis-marker-x';
-      _lower.append(_markerX);
-    }
-    if (_showMarkerY && _markerY == null) {
-      _markerY = new LineElement();
-      _markerY.attributes
-        ..['x1'] = _rect.x.toString()
-        ..['y1'] = '0'
-        ..['x2'] = (_rect.x + _rect.width).toString()
-        ..['y2'] = '0'
-        ..['class'] = 'axis-marker axis-marker-y';
-      _lower.append(_markerY);
-    }
-    _visibility(false);
-  }
-
-  void _update(ChartEvent e) {
-    if (!_isRenderArea(e)) {
-      _visibility(false);
-    } else {
-      _visibility(true);
-      window.requestAnimationFrame((_) {
-        if (_showMarkerX) {
-          _markerX.attributes['transform'] = 'translate(${e.chartX},0)';
-        }
-        if (_showMarkerY) {
-          _markerY.attributes['transform'] = 'translate(0,${e.chartY})';
-        }
-      });
-    }
-  }
-}