From 5954ef32fc6381e328c6cdd435f5c82a8aba6a5a Mon Sep 17 00:00:00 2001
From: Dan Vanderkam <danvk@google.com>
Date: Thu, 17 Dec 2009 07:27:31 -0800
Subject: [PATCH] Patch from ComSubVie to add fillGraph attribute

---
 dygraph-canvas.js | 51 ++++++++++++++++++++++++++++++++++++++++++++++++++-
 dygraph.js        |  3 ++-
 2 files changed, 52 insertions(+), 2 deletions(-)

diff --git a/dygraph-canvas.js b/dygraph-canvas.js
index c3a8296..3db31a7 100644
--- a/dygraph-canvas.js
+++ b/dygraph-canvas.js
@@ -446,6 +446,7 @@ DygraphCanvasRenderer.prototype._renderLineChart = function() {
   var colorCount = this.options.colorScheme.length;
   var colorScheme = this.options.colorScheme;
   var errorBars = this.layout.options.errorBars;
+  var fillGraph = this.layout.options.fillGraph;
 
   var setNames = [];
   for (var name in this.layout.datasets) {
@@ -488,7 +489,7 @@ DygraphCanvasRenderer.prototype._renderLineChart = function() {
         var point = this.layout.points[j];
         count++;
         if (point.name == setName) {
-          if (!point.y || isNaN(point.y)) {
+          if (!isOK(point.y)) {
             prevX = -1;
             continue;
           }
@@ -510,6 +511,54 @@ DygraphCanvasRenderer.prototype._renderLineChart = function() {
       }
       ctx.fill();
     }
+  } else if (fillGraph) {
+    for (var i = 0; i < setCount; i++) {
+      var setName = setNames[i];
+      var setNameLast;
+      if (i>0) setNameLast = setNames[i-1];
+      var color = colorScheme[i % colorCount];
+
+      // setup graphics context
+      ctx.save();
+      ctx.strokeStyle = color;
+      ctx.lineWidth = this.options.strokeWidth;
+      var prevX = -1;
+      var prevYs = [-1, -1];
+      var count = 0;
+      var yscale = this.layout.yscale;
+      // should be same color as the lines but only 15% opaque.
+      var rgb = new RGBColor(color);
+      var err_color = 'rgba(' + rgb.r + ',' + rgb.g + ',' + rgb.b + ',0.15)';
+      ctx.fillStyle = err_color;
+      ctx.beginPath();
+      for (var j = 0; j < this.layout.points.length; j++) {
+        var point = this.layout.points[j];
+        count++;
+        if (point.name == setName) {
+          if (!isOK(point.y)) {
+            prevX = -1;
+            continue;
+          }
+          var pX = 1.0 + this.layout.minyval * this.layout.yscale;
+          if (pX < 0.0) pX = 0.0;
+          else if (pX > 1.0) pX = 1.0;
+          var newYs = [ point.y, pX ];
+          newYs[0] = this.area.h * newYs[0] + this.area.y;
+          newYs[1] = this.area.h * newYs[1] + this.area.y;
+          if (prevX >= 0) {
+            ctx.moveTo(prevX, prevYs[0]);
+            ctx.lineTo(point.canvasx, newYs[0]);
+            ctx.lineTo(point.canvasx, newYs[1]);
+            ctx.lineTo(prevX, prevYs[1]);
+            ctx.closePath();
+          }
+          prevYs[0] = newYs[0];
+          prevYs[1] = newYs[1];
+          prevX = point.canvasx;
+        }
+      }
+      ctx.fill();
+    }
   }
 
   for (var i = 0; i < setCount; i++) {
diff --git a/dygraph.js b/dygraph.js
index bc5e408..10f3b4e 100644
--- a/dygraph.js
+++ b/dygraph.js
@@ -112,7 +112,8 @@ Dygraph.DEFAULT_ATTRS = {
   errorBars: false,
   fractions: false,
   wilsonInterval: true,  // only relevant if fractions is true
-  customBars: false
+  customBars: false,
+  fillGraph: false
 };
 
 // Various logging levels.
-- 
2.7.4