Fixed the issue with DPI. See issue: CodingTrain/website-archive#574

Author: gruselhaus

CodingChallenges/CC_093_DoublePendulum_p5.js/sketch.js

@@ -23,6 +23,8 @@ let buffer;
 
 function setup() {
   createCanvas(500, 300);
+  //Issue with wrong rendering on a retina Mac. See Issue: https://github.com/CodingTrain/website/issues/574
+  pixelDensity(1);
   a1 = PI / 2;
   a2 = PI / 2;
   cx = width / 2;