From e03d443c0a280d8303fc608c917ad2563ca154f1 Mon Sep 17 00:00:00 2001
From: Wim Bruynooghe <wim@wimme.net>
Date: Mon, 19 Nov 2012 15:10:41 +0100
Subject: [PATCH] Range selector: stepplots and fix for gaps in data

- The range selector used to draw always a line chart, now it will also draw a step plot like the main graph when this option is enabled
- When there are gaps in the data, the range selector drew skew lines. Now, during a gap the line will be drawn at the bottom.
---
 dygraph-range-selector.js | 30 +++++++++++++++++++++++++++---
 1 file changed, 27 insertions(+), 3 deletions(-)

diff --git a/dygraph-range-selector.js b/dygraph-range-selector.js
index e2973b0..5b43d5d 100644
--- a/dygraph-range-selector.js
+++ b/dygraph-range-selector.js
@@ -480,6 +480,8 @@ DygraphRangeSelector.prototype.drawMiniPlot_ = function() {
     return;
   }
 
+  var stepPlot = this.attr_('stepPlot');
+
   var combinedSeriesData = this.computeCombinedSeriesAndLimits_();
   var yRange = combinedSeriesData.yMax - combinedSeriesData.yMin;
 
@@ -494,15 +496,37 @@ DygraphRangeSelector.prototype.drawMiniPlot_ = function() {
   var canvasWidth = this.canvasRect_.w - margin;
   var canvasHeight = this.canvasRect_.h - margin;
 
+  var prevX = null, prevY = null;
+
   ctx.beginPath();
   ctx.moveTo(margin, canvasHeight);
   for (var i = 0; i < combinedSeriesData.data.length; i++) {
     var dataPoint = combinedSeriesData.data[i];
-    var x = (dataPoint[0] - xExtremes[0])*xFact;
-    var y = canvasHeight - (dataPoint[1] - combinedSeriesData.yMin)*yFact;
+    var x = ((dataPoint[0] !== null) ? ((dataPoint[0] - xExtremes[0])*xFact) : NaN);
+    var y = ((dataPoint[1] !== null) ? (canvasHeight - (dataPoint[1] - combinedSeriesData.yMin)*yFact) : NaN);
     if (isFinite(x) && isFinite(y)) {
+      if(prevX === null) {
+  	    ctx.lineTo(x, canvasHeight);
+	    }
+	    else if (stepPlot) {
+		    ctx.lineTo(x, prevY);
+	    }
       ctx.lineTo(x, y);
-    }
+      prevX = x;
+	    prevY = y;
+    }
+    else {
+	    if(prevX !== null) {
+		    if (stepPlot) {
+			    ctx.lineTo(x, prevY);
+		      ctx.lineTo(x, canvasHeight);
+		    }
+		    else {
+		      ctx.lineTo(prevX, canvasHeight);
+		    }
+	    }
+	    prevX = prevY = null;
+	  }
   }
   ctx.lineTo(canvasWidth, canvasHeight);
   ctx.closePath();
-- 
2.7.4