--- /dev/null
+/**
+ * @license
+ * Copyright 2013 David Eberlein (david.eberlein@ch.sauter-bc.com)
+ * MIT-licensed (http://opensource.org/licenses/MIT)
+ */
+
+/**
+ * @fileoverview DataHandler base implementation for the "bar"
+ * data formats. This implementation must be extended and the
+ * extractSeries and rollingAverage must be implemented.
+ * @author David Eberlein (david.eberlein@ch.sauter-bc.com)
+ */
+
+(function() {
+
+/*global Dygraph:false */
+/*global DygraphLayout:false */
+"use strict";
+
+/**
+ * @constructor
+ * @extends {Dygraph.DataHandler}
+ */
+Dygraph.DataHandlers.BarsHandler = function() {
+ Dygraph.DataHandler.call(this);
+};
+Dygraph.DataHandlers.BarsHandler.prototype = new Dygraph.DataHandler();
+
+// alias for the rest of the implementation
+var BarsHandler = Dygraph.DataHandlers.BarsHandler;
+
+// TODO(danvk): figure out why the jsdoc has to be copy/pasted from superclass.
+// (I get closure compiler errors if this isn't here.)
+/**
+ * @override
+ * @param {!Array.<Array>} rawData The raw data passed into dygraphs where
+ * rawData[i] = [x,ySeries1,...,ySeriesN].
+ * @param {!number} seriesIndex Index of the series to extract. All other
+ * series should be ignored.
+ * @param {!DygraphOptions} options Dygraph options.
+ * @return {Array.<[!number,?number,?]>} The series in the unified data format
+ * where series[i] = [x,y,{extras}].
+ */
+BarsHandler.prototype.extractSeries = function(rawData, seriesIndex, options) {
+ // Not implemented here must be extended
+};
+
+/**
+ * @override
+ * @param {!Array.<[!number,?number,?]>} series The series in the unified
+ * data format where series[i] = [x,y,{extras}].
+ * @param {!number} rollPeriod The number of points over which to average the data
+ * @param {!DygraphOptions} options The dygraph options.
+ * TODO(danvk): be more specific than "Array" here.
+ * @return {!Array.<[!number,?number,?]>} the rolled series.
+ */
+BarsHandler.prototype.rollingAverage =
+ function(series, rollPeriod, options) {
+ // Not implemented here, must be extended.
+};
+
+/** @inheritDoc */
+BarsHandler.prototype.onPointsCreated_ = function(series, points) {
+ for (var i = 0; i < series.length; ++i) {
+ var item = series[i];
+ var point = points[i];
+ point.y_top = NaN;
+ point.y_bottom = NaN;
+ point.yval_minus = Dygraph.DataHandler.parseFloat(item[2][0]);
+ point.yval_plus = Dygraph.DataHandler.parseFloat(item[2][1]);
+ }
+};
+
+/** @inheritDoc */
+BarsHandler.prototype.getExtremeYValues = function(series, dateWindow, options) {
+ var minY = null, maxY = null, y;
+
+ var firstIdx = 0;
+ var lastIdx = series.length - 1;
+
+ for ( var j = firstIdx; j <= lastIdx; j++) {
+ y = series[j][1];
+ if (y === null || isNaN(y)) continue;
+
+ var low = series[j][2][0];
+ var high = series[j][2][1];
+
+ if (low > y) low = y; // this can happen with custom bars,
+ if (high < y) high = y; // e.g. in tests/custom-bars.html
+
+ if (maxY === null || high > maxY) maxY = high;
+ if (minY === null || low < minY) minY = low;
+ }
+
+ return [ minY, maxY ];
+};
+
+/** @inheritDoc */
+BarsHandler.prototype.onLineEvaluated = function(points, axis, logscale) {
+ var point;
+ for (var j = 0; j < points.length; j++) {
+ // Copy over the error terms
+ point = points[j];
+ point.y_top = DygraphLayout.calcYNormal_(axis, point.yval_minus, logscale);
+ point.y_bottom = DygraphLayout.calcYNormal_(axis, point.yval_plus, logscale);
+ }
+};
+
+})();