X-Git-Url: https://adrianiainlam.tk/git/?a=blobdiff_plain;f=plugins%2Frange-selector.js;fp=plugins%2Frange-selector.js;h=8e74ad90b5789d72599043db6a2bd975a50aa45d;hb=e146f6144b47eab0b66f8fd9cb8d84c4615098e6;hp=3a70e7d9ce5fcb5c7f437aa9c39107667411f3cf;hpb=0a0885d1383321a67155fcf1cb12c583cdd89ef2;p=dygraphs.git

diff --git a/plugins/range-selector.js b/plugins/range-selector.js
index 3a70e7d..8e74ad9 100644
--- a/plugins/range-selector.js
+++ b/plugins/range-selector.js
@@ -594,6 +594,13 @@ rangeSelector.prototype.drawMiniPlot_ = function() {
     var dataPoint = combinedSeriesData.data[i];
     var x = ((dataPoint[0] !== null) ? ((dataPoint[0] - xExtremes[0])*xFact) : NaN);
     var y = ((dataPoint[1] !== null) ? (canvasHeight - (dataPoint[1] - combinedSeriesData.yMin)*yFact) : NaN);
+
+    // Skip points that don't change the x-value. Overly fine-grained points
+    // can cause major slowdowns with the ctx.fill() call below.
+    if (!stepPlot && prevX !== null && Math.round(x) == Math.round(prevX)) {
+      continue;
+    }
+
     if (isFinite(x) && isFinite(y)) {
       if(prevX === null) {
         ctx.lineTo(x, canvasHeight);