Added pixelRatio option to override canvas upscaling. Resolves #876, test included...

[dygraphs.git] / src / dygraph.js

diff --git a/src/dygraph.js b/src/dygraph.js
index ba44739..531191f 100644 (file)
--- a/src/dygraph.js
+++ b/src/dygraph.js
@@ -861,7 +861,9 @@ Dygraph.prototype.resizeElements_ = function() {
   this.graphDiv.style.width = this.width_ + "px";
   this.graphDiv.style.height = this.height_ + "px";
 
-  var canvasScale = utils.getContextPixelRatio(this.canvas_ctx_);
+  var pixelRatioOption = this.getNumericOption('pixelRatio')
+
+  var canvasScale = pixelRatioOption || utils.getContextPixelRatio(this.canvas_ctx_);
   this.canvas_.width = this.width_ * canvasScale;
   this.canvas_.height = this.height_ * canvasScale;
   this.canvas_.style.width = this.width_ + "px";    // for IE
@@ -870,7 +872,7 @@ Dygraph.prototype.resizeElements_ = function() {
     this.canvas_ctx_.scale(canvasScale, canvasScale);
   }
 
-  var hiddenScale = utils.getContextPixelRatio(this.hidden_ctx_);
+  var hiddenScale = pixelRatioOption || utils.getContextPixelRatio(this.hidden_ctx_);
   this.hidden_.width = this.width_ * hiddenScale;
   this.hidden_.height = this.height_ * hiddenScale;
   this.hidden_.style.width = this.width_ + "px";    // for IE