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.

diff --git a/dygraph-range-selector.js b/dygraph-range-selector.js
index e2973b0..5b43d5d 100644 (file)
--- 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();