Move code into src/

[dygraphs.git] / src / datahandler / bars-custom.js

diff --git a/src/datahandler/bars-custom.js b/src/datahandler/bars-custom.js
new file mode 100644 (file)
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--- /dev/null
+++ b/src/datahandler/bars-custom.js
@@ -0,0 +1,103 @@
+/**
+ * @license
+ * Copyright 2013 David Eberlein (david.eberlein@ch.sauter-bc.com)
+ * MIT-licensed (http://opensource.org/licenses/MIT)
+ */
+
+/**
+ * @fileoverview DataHandler implementation for the custom bars option.
+ * @author David Eberlein (david.eberlein@ch.sauter-bc.com)
+ */
+
+(function() {
+
+/*global Dygraph:false */
+"use strict";
+
+/**
+ * @constructor
+ * @extends Dygraph.DataHandlers.BarsHandler
+ */
+Dygraph.DataHandlers.CustomBarsHandler = function() {
+};
+
+var CustomBarsHandler = Dygraph.DataHandlers.CustomBarsHandler;
+CustomBarsHandler.prototype = new Dygraph.DataHandlers.BarsHandler();
+
+/** @inheritDoc */
+CustomBarsHandler.prototype.extractSeries = function(rawData, i, options) {
+  // TODO(danvk): pre-allocate series here.
+  var series = [];
+  var x, y, point;
+  var logScale = options.get('logscale');
+  for ( var j = 0; j < rawData.length; j++) {
+    x = rawData[j][0];
+    point = rawData[j][i];
+    if (logScale && point !== null) {
+      // On the log scale, points less than zero do not exist.
+      // This will create a gap in the chart.
+      if (point[0] <= 0 || point[1] <= 0 || point[2] <= 0) {
+        point = null;
+      }
+    }
+    // Extract to the unified data format.
+    if (point !== null) {
+      y = point[1];
+      if (y !== null && !isNaN(y)) {
+        series.push([ x, y, [ point[0], point[2] ] ]);
+      } else {
+        series.push([ x, y, [ y, y ] ]);
+      }
+    } else {
+      series.push([ x, null, [ null, null ] ]);
+    }
+  }
+  return series;
+};
+
+/** @inheritDoc */
+CustomBarsHandler.prototype.rollingAverage =
+    function(originalData, rollPeriod, options) {
+  rollPeriod = Math.min(rollPeriod, originalData.length);
+  var rollingData = [];
+  var y, low, high, mid,count, i, extremes;
+
+  low = 0;
+  mid = 0;
+  high = 0;
+  count = 0;
+  for (i = 0; i < originalData.length; i++) {
+    y = originalData[i][1];
+    extremes = originalData[i][2];
+    rollingData[i] = originalData[i];
+
+    if (y !== null && !isNaN(y)) {
+      low += extremes[0];
+      mid += y;
+      high += extremes[1];
+      count += 1;
+    }
+    if (i - rollPeriod >= 0) {
+      var prev = originalData[i - rollPeriod];
+      if (prev[1] !== null && !isNaN(prev[1])) {
+        low -= prev[2][0];
+        mid -= prev[1];
+        high -= prev[2][1];
+        count -= 1;
+      }
+    }
+    if (count) {
+      rollingData[i] = [
+          originalData[i][0],
+          1.0 * mid / count, 
+          [ 1.0 * low / count,
+            1.0 * high / count ] ];
+    } else {
+      rollingData[i] = [ originalData[i][0], null, [ null, null ] ];
+    }
+  }
+
+  return rollingData;
+};
+
+})();