Roll Observatory packages and add a roll script

packages/charted/examples/selection/transitions_demo.dart

Index: packages/charted/examples/selection/transitions_demo.dart
diff --git a/packages/charted/examples/selection/transitions_demo.dart b/packages/charted/examples/selection/transitions_demo.dart
new file mode 100644
index 0000000000000000000000000000000000000000..1585a5bd83b7f574904264e665a3c2aa27cdcf51
--- /dev/null
+++ b/packages/charted/examples/selection/transitions_demo.dart
@@ -0,0 +1,219 @@
+/*
+ * 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
+ */
+library charted.demos.transitions;
+
+import 'package:charted/charted.dart';
+
+void main() {
+  SelectionScope scope = new SelectionScope.selector('.wrapper');
+
+
+  Selection svg = scope.append('svg:svg')
+      ..style('width', '4000px')
+      ..style('height', '4000px');
+
+  Selection g1 = svg.append('g');
+  g1.attr('transform', 'translate(30, 30)');
+
+  SvgLine line = new SvgLine();
+
+  List lineData = [
+      [ [0, 10], [400, 10] ],
+      [ [0, 50], [400, 50] ],
+      [ [0, 90], [400, 90] ],
+      [ [0, 130], [400, 130] ]
+  ];
+  DataSelection lines = g1.selectAll('.line').data(lineData);
+
+  lines.enter.append('path');
+  lines
+      ..attrWithCallback('d', (d, i, e) => line.path(d, i, e))
+      ..classed('line');
+  lines.exit.remove();
+
+
+  var text1 = g1.append('text');
+  text1..attr('x', 0)
+       ..attr('y', 0)
+       ..text('Transition cubic-in-out');
+  var text2 = g1.append('text');
+  text2..attr('x', 0)
+       ..attr('y', 40)
+       ..text('Transition cubic-in');
+  var text3 = g1.append('text');
+  text3..attr('x', 0)
+       ..attr('y', 80)
+       ..text('Transition cubic-out');
+  var text4 = g1.append('text');
+  text4..attr('x', 0)
+       ..attr('y', 120)
+       ..text('Transition cubic-out-in');
+
+  var circle = g1.append('circle');
+  circle
+      ..attr('cx', 0)
+      ..attr('cy', 10)
+      ..attr('r', 4)
+      ..classed('circle');
+
+  // Doing transition for first circle with sub transition selection.
+  Transition t1 = new Transition(g1);
+  t1.duration(4000);
+  t1.select('.circle').attr('cx', 400);
+
+  var circle2 = g1.append('circle');
+  circle2
+      ..attr('cx', 0)
+      ..attr('cy', 50)
+      ..attr('r', 4);
+
+  Transition t2 = new Transition(circle2);
+  t2
+      ..ease = clampEasingFn(identityFunction(easeCubic()))
+      ..attr('cx', 400)
+      ..duration(4000);
+
+  var circle3 = g1.append('circle');
+  circle3
+      ..attr('cx', 0)
+      ..attr('cy', 90)
+      ..attr('r', 4);
+
+  Transition t3 = new Transition(circle3);
+  t3
+      ..ease = clampEasingFn(reverseEasingFn(easeCubic()))
+      ..attr('cx', 400)
+      ..duration(4000);
+
+  var circle4 = g1.append('circle');
+  circle4
+      ..attr('cx', 0)
+      ..attr('cy', 130)
+      ..attr('r', 4);
+
+  Transition t4 = new Transition(circle4);
+  t4
+      ..ease = clampEasingFn(reflectReverseEasingFn(easeCubic()))
+      ..attr('cx', 400)
+      ..duration(4000);
+
+
+  Color dotColor1 = new Color.fromRgba(10, 255, 0, 1.0);
+  Color dotColor2 = new Color.fromRgba(40, 0, 255, 1.0);
+  String shape1 = 'M50 100 L50 200 L100 200 Z';
+  String shape2 = 'M900 0 L750 200 L900 200 Z';
+
+  Selection g2 = svg.append('g');
+
+  var text5 = g2.append('text');
+  text5..attr('x', 0)
+       ..attr('y', 0)
+       ..text('Transition shape and color');
+
+  g2.attr('transform', 'translate(30, 200)');
+  g2.attr('width', '1000');
+  g2.attr('height', '400');
+  Selection shape = g2.append('path');
+  shape
+      ..attr('d', shape1)
+      ..attr('fill', dotColor1);
+
+  Transition t5 = new Transition(shape);
+  t5.duration(4000);
+  t5.attr('d', shape2);
+  t5.attr('fill', dotColor2);
+
+  Selection g3 = svg.append('g');
+  var text6 = g3.append('text');
+  text6..attr('x', 0)
+       ..attr('y', 0)
+       ..text('Transition delay');
+
+  g3.attr('transform', 'translate(30, 450)');
+  g3.attr('width', '1000');
+  g3.attr('height', '1000');
+
+  Selection rect = g3.append('rect');
+  rect
+      ..attr('x', 0)
+      ..attr('y', 10)
+      ..attr('width', 40)
+      ..attr('height', 40)
+      ..attr('fill', '#FF0000');
+
+  Transition t6 = new Transition(rect);
+  t6.duration(4000);
+  t6.delay(4000);
+  t6.attr('x', 400);
+  t6.attr('fill', '#00FF00');
+
+  var t7 = t6.transition();
+  t7.attr('y', 400);
+  t7.attr('fill', '#0000FF');
+
+  var t8 = t7.transition();
+  t8.attr('x', 0);
+  t8.attr('fill', '#FF00FF');
+
+  var t9 = t8.transition();
+  t9.attr('y', 10);
+  t9.attr('fill', '#FF0000');
+
+  Selection g4 = svg.append('g');
+  DataSelection bars =
+      g4.selectAll('bar').data([120, 160, 210, 260]);
+  g4.attr('transform', 'translate(30, 850)');
+  bars.enter.append('rect');
+  bars
+      ..attrWithCallback('x', (d,i,e) => i * 150)
+      ..attr('y', 350)
+      ..attr('width', 100)
+      ..attr('height', 0)
+      ..style('fill', '#6699FF');
+  bars.exit.remove();
+
+  var t = bars.transition();
+  t.duration(1000);
+  t.delayWithCallback((d, i, c) => i * 200);
+  t.attrTween('y', (d, i, attr) => createStringInterpolator(
+      attr, (350 - d).toString()));
+  t.attrTween('height', (d, i, attr) => createStringInterpolator(attr, d.toString()));
+
+  var color = t.transition();
+  color.delayWithCallback((d, i, c) => i * 200);
+  color.styleTween('fill',
+      (d, i, style) => createStringInterpolator(style, '#CC0088'));
+
+  Color hslColor1 = new Color.fromRgba(10, 255, 0, 1.0);
+  Color hslColor2 = new Color.fromRgba(40, 0, 255, 1.0);
+  Selection g5 = svg.append('g');
+  var text7 = g5.append('text');
+  text7..attr('x', 0)
+       ..attr('y', 0)
+       ..text('HSL Color Transition with Transform');
+
+  g5.attr('transform', 'translate(30, 1300)');
+
+  Selection rect2 = g5.append('rect');
+  rect2
+      ..attr('x', 0)
+      ..attr('y', 10)
+      ..attr('width', 200)
+      ..attr('height', 60);
+  rect2.transition()
+      ..attrTween('fill', (d, i, e) {
+        return createHslColorInterpolator(hslColor1, hslColor2);})
+      ..duration(2000);
+
+  rect2.transition()
+      ..attrTween('transform', (d, i, e) => createTransformInterpolator(
+          "translate(10,10)rotate(30)skewX(0.5)scale(1,1)",
+          "translate(100,100)rotate(360)skewX(45)scale(3,3)"))
+      ..duration(5000);
+}
+