Roll Observatory packages and add a roll script

packages/charted/examples/charts/renderers/demo_bar_charts.dart

Index: packages/charted/examples/charts/renderers/demo_bar_charts.dart
diff --git a/packages/charted/examples/charts/renderers/demo_bar_charts.dart b/packages/charted/examples/charts/renderers/demo_bar_charts.dart
new file mode 100644
index 0000000000000000000000000000000000000000..8cb1f5a9cac65da33cd9cb0f51973e5dc664e94c
--- /dev/null
+++ b/packages/charted/examples/charts/renderers/demo_bar_charts.dart
@@ -0,0 +1,103 @@
+
+library charted.demo.charts.bar_charts;
+
+import "dart:html";
+import "package:charted/charts/charts.dart";
+import "../demo_charts.dart";
+
+void drawSimpleBarChart(String selector, bool grouped) {
+  var wrapper = document.querySelector(selector),
+      areaHost = wrapper.querySelector('.chart-host'),
+      legendHost = wrapper.querySelector('.chart-legend-host');
+
+  var series = new ChartSeries(
+          "one", grouped ? [2, 3] : [2], new BarChartRenderer()),
+      config = new ChartConfig([series], [0])
+        ..legend = new ChartLegend(legendHost),
+      data = new ChartData(ORDINAL_DATA_COLUMNS, ORDINAL_DATA),
+      state = new ChartState();
+
+  var area = new CartesianArea(areaHost, data, config, state: state);
+
+  createDefaultCartesianBehaviors().forEach((behavior) {
+    area.addChartBehavior(behavior);
+  });
+  area.draw();
+}
+
+void drawHorizontalBarChart(String selector, bool grouped) {
+  var wrapper = document.querySelector(selector),
+      areaHost = wrapper.querySelector('.chart-host'),
+      legendHost = wrapper.querySelector('.chart-legend-host');
+
+  var series = new ChartSeries(
+          "one", grouped ? [2, 3] : [2], new BarChartRenderer()),
+      config = new ChartConfig([series], [0])
+        ..legend = new ChartLegend(legendHost)
+        ..isLeftAxisPrimary = true,
+      data = new ChartData(ORDINAL_DATA_COLUMNS, ORDINAL_DATA),
+      state = new ChartState();
+
+  var area = new CartesianArea(areaHost, data, config, state: state);
+
+  createDefaultCartesianBehaviors().forEach((behavior) {
+    area.addChartBehavior(behavior);
+  });
+  area.draw();
+}
+
+void drawChartWithNegativeNumbers(String selector, bool grouped) {
+  var wrapper = document.querySelector(selector),
+      areaHost = wrapper.querySelector('.chart-host'),
+      legendHost = wrapper.querySelector('.chart-legend-host');
+
+  var series = new ChartSeries(
+          "one", grouped ? [2, 3] : [2], new BarChartRenderer()),
+      config = new ChartConfig([series], [0])
+        ..legend = new ChartLegend(legendHost),
+      data = new ChartData(ORDINAL_DATA_COLUMNS, ORDINAL_DATA_WITH_NEGATIVE),
+      state = new ChartState();
+
+  var area = new CartesianArea(areaHost, data, config, state: state);
+
+  createDefaultCartesianBehaviors().forEach((behavior) {
+    area.addChartBehavior(behavior);
+  });
+  area.draw();
+}
+
+void drawHorizontalChartWithNegativeNumbers(String selector, bool grouped) {
+  var wrapper = document.querySelector(selector),
+      areaHost = wrapper.querySelector('.chart-host'),
+      legendHost = wrapper.querySelector('.chart-legend-host');
+
+  var series = new ChartSeries(
+          "one", grouped ? [2, 3] : [2], new BarChartRenderer()),
+      config = new ChartConfig([series], [0])
+        ..legend = new ChartLegend(legendHost)
+        ..isLeftAxisPrimary = true,
+      data = new ChartData(ORDINAL_DATA_COLUMNS, ORDINAL_DATA_WITH_NEGATIVE),
+      state = new ChartState();
+
+  var area = new CartesianArea(areaHost, data, config, state: state);
+
+  createDefaultCartesianBehaviors().forEach((behavior) {
+    area.addChartBehavior(behavior);
+  });
+  area.draw();
+}
+
+main() {
+  drawSimpleBarChart('#simple-bar-chart', false);
+  drawHorizontalBarChart('#horizontal-bar-chart', false);
+  drawChartWithNegativeNumbers('#simple-with-negative-numbers', false);
+  drawHorizontalChartWithNegativeNumbers(
+      '#horizontal-with-negative-numbers', false);
+
+  drawSimpleBarChart('#grouped-bar-chart', true);
+  drawHorizontalBarChart('#horizontal-grouped-bar-chart', true);
+  drawChartWithNegativeNumbers('#grouped-with-negative-numbers', true);
+  drawHorizontalChartWithNegativeNumbers(
+      '#horizontal-grouped-with-negative-numbers', true);
+}
+