Roll Observatory packages and add a roll script

charted/lib/charts/cartesian_renderers/bubble_chart_renderer.dart

-/*
- * 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;
-
-class BubbleChartRenderer extends CartesianRendererBase {
-  final Iterable<int> dimensionsUsingBand = const[];
-  final double maxBubbleRadius;
-  final bool alwaysAnimate;
-
-  Element _host;
-  Selection _group;
-  SelectionScope _scope;
-
-  @override
-  final String name = "bubble-rdr";
-
-  BubbleChartRenderer({
-      this.maxBubbleRadius: 20.0,
-      this.alwaysAnimate: false});
-
-  /*
-   * BubbleChart needs two dimension axes.
-   */
-  @override
-  bool prepare(ChartArea area, ChartSeries series) {
-    _ensureAreaAndSeries(area, series);
-    return area is CartesianArea && area.useTwoDimensionAxes == true;
-  }
-
-  @override
-  void draw(Element element, {Future schedulePostRender}) {
-    assert(series != null && area != null);
-    assert(element != null && element is GElement);
-
-    if (_scope == null) {
-      _host = element;
-      _scope = new SelectionScope.element(element);
-      _group = _scope.selectElements([_host]);
-    }
-
-    var geometry = area.layout.renderArea,
-        bubbleRadiusScale = area.measureScales(series).first,
-        xDimensionScale = area.dimensionScales.first,
-        yDimensionScale = area.dimensionScales.last,
-        theme = area.theme,
-        bubbleRadiusFactor =
-            maxBubbleRadius / min([geometry.width, geometry.height]);
-
-    String color(i) => theme.getColorForKey(series.measures.elementAt(i));
-
-    // Measure values used to set size of the bubble.
-    var columns = [];
-    for (int m in series.measures) {
-      columns.add(new List.from(
-          area.data.rows.map((Iterable row) => row.elementAt(m))));
-    }
-
-    // Dimension values used to position the bubble.
-    var xDimensionIndex = area.config.dimensions.first,
-        yDimensionIndex = area.config.dimensions.last,
-        xDimensionVals = [],
-        yDimensionVals = [];
-    for (var row in area.data.rows) {
-      xDimensionVals.add(row.elementAt(xDimensionIndex));
-      yDimensionVals.add(row.elementAt(yDimensionIndex));
-    }
-
-    var group = _group.selectAll('.measure-group').data(columns);
-    group.enter.append('g')..classed('measure-group');
-    group.each((d, i, e) {
-      e.style.setProperty('fill', color(i));
-      e.attributes['data-column'] = series.measures.elementAt(i);
-    });
-    group.exit.remove();
-
-    var measures = group.selectAll('.bubble').dataWithCallback(
-        (d, i, e) => columns[i]);
-
-    measures.enter.append('circle')..classed('bubble');
-    measures.each((d, i, e) {
-      e.attributes
-        ..['transform'] = 'translate('
-            '${xDimensionScale.scale(xDimensionVals[i])},'
-            '${yDimensionScale.scale(yDimensionVals[i])})'
-        ..['r'] = '${bubbleRadiusScale.scale(d) * bubbleRadiusFactor}'
-        ..['data-row'] = i;
-    });
-    measures.exit.remove();
-    handleStateChanges([]);
-  }
-
-  @override
-  void dispose() {
-    if (_group == null) return;
-    _group.selectAll('.row-group').remove();
-  }
-
-  @override
-  double get bandInnerPadding => 1.0;
-
-  @override
-  double get bandOuterPadding =>
-      area.theme.getDimensionAxisTheme().axisOuterPadding;
-
-  @override
-  Extent get extent {
-    assert(series != null && area != null);
-    var rows = area.data.rows,
-        max = rows[0][series.measures.first],
-        min = max;
-
-    rows.forEach((row) {
-      series.measures.forEach((idx) {
-        if (row[idx] > max) max = row[idx];
-        if (row[idx] < min) min = row[idx];
-      });
-    });
-    return new Extent(min, max);
-  }
-
-  @override
-  void handleStateChanges(List<ChangeRecord> changes) {
-    var groups = host.querySelectorAll('.bar-rdr-rowgroup');
-    if (groups == null || groups.isEmpty) return;
-
-    for(int i = 0, len = groups.length; i < len; ++i) {
-      var group = groups.elementAt(i),
-          bars = group.querySelectorAll('.bar-rdr-bar'),
-          row = int.parse(group.dataset['row']);
-
-      for(int j = 0, barsCount = bars.length; j < barsCount; ++j) {
-        var bar = bars.elementAt(j),
-            column = int.parse(bar.dataset['column']),
-            color = colorForValue(column, row);
-
-        bar.classes.removeAll(ChartState.VALUE_CLASS_NAMES);
-        bar.classes.addAll(stylesForValue(column, row));
-        bar.style
-          ..setProperty('fill', color)
-          ..setProperty('stroke', color);
-      }
-    }
-  }
-
-  void _event(StreamController controller, data, int index, Element e) {
-    if (controller == null) return;
-    var rowStr = e.parent.dataset['row'];
-    var row = rowStr != null ? int.parse(rowStr) : null;
-    controller.add(
-        new DefaultChartEventImpl(_scope.event, area, series, row, index, data));
-  }
-}