Move code into src/

[dygraphs.git] / src / datahandler / default.js

diff --git a/src/datahandler/default.js b/src/datahandler/default.js
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+/**
+ * @license
+ * Copyright 2013 David Eberlein (david.eberlein@ch.sauter-bc.com)
+ * MIT-licensed (http://opensource.org/licenses/MIT)
+ */
+
+/**
+ * @fileoverview DataHandler default implementation used for simple line charts.
+ * @author David Eberlein (david.eberlein@ch.sauter-bc.com)
+ */
+
+(function() {
+
+/*global Dygraph:false */
+"use strict";
+
+/**
+ * @constructor
+ * @extends Dygraph.DataHandler
+ */
+Dygraph.DataHandlers.DefaultHandler = function() {
+};
+
+var DefaultHandler = Dygraph.DataHandlers.DefaultHandler;
+DefaultHandler.prototype = new Dygraph.DataHandler();
+
+/** @inheritDoc */
+DefaultHandler.prototype.extractSeries = function(rawData, i, options) {
+  // TODO(danvk): pre-allocate series here.
+  var series = [];
+  var logScale = options.get('logscale');
+  for ( var j = 0; j < rawData.length; j++) {
+    var x = rawData[j][0];
+    var point = rawData[j][i];
+    if (logScale) {
+      // On the log scale, points less than zero do not exist.
+      // This will create a gap in the chart.
+      if (point <= 0) {
+        point = null;
+      }
+    }
+    series.push([ x, point ]);
+  }
+  return series;
+};
+
+/** @inheritDoc */
+DefaultHandler.prototype.rollingAverage = function(originalData, rollPeriod,
+    options) {
+  rollPeriod = Math.min(rollPeriod, originalData.length);
+  var rollingData = [];
+
+  var i, j, y, sum, num_ok;
+  // Calculate the rolling average for the first rollPeriod - 1 points
+  // where
+  // there is not enough data to roll over the full number of points
+  if (rollPeriod == 1) {
+    return originalData;
+  }
+  for (i = 0; i < originalData.length; i++) {
+    sum = 0;
+    num_ok = 0;
+    for (j = Math.max(0, i - rollPeriod + 1); j < i + 1; j++) {
+      y = originalData[j][1];
+      if (y === null || isNaN(y))
+        continue;
+      num_ok++;
+      sum += originalData[j][1];
+    }
+    if (num_ok) {
+      rollingData[i] = [ originalData[i][0], sum / num_ok ];
+    } else {
+      rollingData[i] = [ originalData[i][0], null ];
+    }
+  }
+
+  return rollingData;
+};
+
+/** @inheritDoc */
+DefaultHandler.prototype.getExtremeYValues = function(series, dateWindow,
+    options) {
+  var minY = null, maxY = null, y;
+  var firstIdx = 0, lastIdx = series.length - 1;
+
+  for ( var j = firstIdx; j <= lastIdx; j++) {
+    y = series[j][1];
+    if (y === null || isNaN(y))
+      continue;
+    if (maxY === null || y > maxY) {
+      maxY = y;
+    }
+    if (minY === null || y < minY) {
+      minY = y;
+    }
+  }
+  return [ minY, maxY ];
+};
+
+})();