From f032c51dd2d8d17c30f8f55cf55d663b1f9df066 Mon Sep 17 00:00:00 2001
From: Adam Vartanian <flooey@google.com>
Date: Thu, 4 Mar 2010 14:45:50 -0500
Subject: [PATCH] Add connectSeparatedPoints option to ignore points with no
 value. Created color-by-name map to look up colors, since not all datasets
 have a point at each timestamp, so we can no longer rely on dataset index.

---
 dygraph-canvas.js | 11 ++++++++---
 dygraph.js        | 19 ++++++++++++-------
 2 files changed, 20 insertions(+), 10 deletions(-)

diff --git a/dygraph-canvas.js b/dygraph-canvas.js
index 979688d..2c18345 100644
--- a/dygraph-canvas.js
+++ b/dygraph-canvas.js
@@ -463,6 +463,11 @@ DygraphCanvasRenderer.prototype._renderLineChart = function() {
   }
   var setCount = setNames.length;
 
+  this.colors = {}
+  for (var i = 0; i < setCount; i++) {
+    this.colors[setNames[i]] = colorScheme[i % colorCount];
+  }
+
   // Update Points
   // TODO(danvk): here
   for (var i = 0; i < this.layout.points.length; i++) {
@@ -482,7 +487,7 @@ DygraphCanvasRenderer.prototype._renderLineChart = function() {
 
     for (var i = 0; i < setCount; i++) {
       var setName = setNames[i];
-      var color = colorScheme[i % colorCount];
+      var color = this.colors[setName];
 
       // setup graphics context
       ctx.save();
@@ -531,7 +536,7 @@ DygraphCanvasRenderer.prototype._renderLineChart = function() {
       var setName = setNames[i];
       var setNameLast;
       if (i>0) setNameLast = setNames[i-1];
-      var color = colorScheme[i % colorCount];
+      var color = this.colors[setName];
 
       // setup graphics context
       ctx.save();
@@ -579,7 +584,7 @@ DygraphCanvasRenderer.prototype._renderLineChart = function() {
 
   for (var i = 0; i < setCount; i++) {
     var setName = setNames[i];
-    var color = colorScheme[i%colorCount];
+    var color = this.colors[setName];
 
     // setup graphics context
     context.save();
diff --git a/dygraph.js b/dygraph.js
index e45fc47..6aa6bf4 100644
--- a/dygraph.js
+++ b/dygraph.js
@@ -116,6 +116,7 @@ Dygraph.DEFAULT_ATTRS = {
   customBars: false,
   fillGraph: false,
   fillAlpha: 0.15,
+  connectSeparatedPoints: false,
 
   stackedGraph: false,
   hideOverlayOnMouseOut: true
@@ -885,7 +886,7 @@ Dygraph.prototype.mouseMove_ = function(event) {
   var idx = -1;
   for (var i = 0; i < points.length; i++) {
     var dist = Math.abs(points[i].canvasx - canvasx);
-    if (dist > minDist) break;
+    if (dist > minDist) continue;
     minDist = dist;
     idx = i;
   }
@@ -957,7 +958,7 @@ Dygraph.prototype.updateSelection_ = function() {
         replace += "<br/>";
       }
       var point = this.selPoints_[i];
-      var c = new RGBColor(this.colors_[i%clen]);
+      var c = new RGBColor(this.plotter_.colors_[point.name]);
       replace += " <b><font color='" + c.toHex() + "'>"
               + point.name + "</font></b>:"
               + this.round_(point.yval, 2);
@@ -967,10 +968,10 @@ Dygraph.prototype.updateSelection_ = function() {
     // Draw colored circles over the center of each selected point
     ctx.save();
     for (var i = 0; i < this.selPoints_.length; i++) {
-      if (!isOK(this.selPoints_[i%clen].canvasy)) continue;
+      if (!isOK(this.selPoints_[i].canvasy)) continue;
       ctx.beginPath();
-      ctx.fillStyle = this.colors_[i%clen];
-      ctx.arc(canvasx, this.selPoints_[i%clen].canvasy, circleSize,
+      ctx.fillStyle = this.plotter_.colors_[this.selPoints_[i].name];
+      ctx.arc(canvasx, this.selPoints_[i].canvasy, circleSize,
               0, 2 * Math.PI, false);
       ctx.fill();
     }
@@ -1471,6 +1472,8 @@ Dygraph.prototype.drawGraph_ = function(data) {
   this.setColors_();
   this.attrs_['pointSize'] = 0.5 * this.attr_('highlightCircleSize');
 
+  var connectSeparatedPoints = this.attr_('connectSeparatedPoints');
+
   // For stacked series.
   var cumulative_y = [];
   var stacked_datasets = [];
@@ -1481,8 +1484,10 @@ Dygraph.prototype.drawGraph_ = function(data) {
 
     var series = [];
     for (var j = 0; j < data.length; j++) {
-      var date = data[j][0];
-      series[j] = [date, data[j][i]];
+      if (data[j][i] || !connectSeparatedPoints) {
+        var date = data[j][0];
+        series[j] = [date, data[j][i]];
+      }
     }
     series = this.rollingAverage(series, this.rollPeriod_);
 
-- 
2.7.4