bugfixes

src/modules/Dynamic/Module.js

@@ -54,6 +54,22 @@ module.exports = function Dynamic(options,UI) {
       ]
     }
 
+    // via P5js: https://github.com/processing/p5.js/blob/2920492842aae9a8bf1a779916893ac19d65cd38/src/math/calculation.js#L461-L472
+    function map(n, start1, stop1, start2, stop2, withinBounds) {
+      var newval = (n - start1) / (stop1 - start1) * (stop2 - start2) + start2;
+      if (!withinBounds) {
+        return newval;
+      }
+      // also via P5js: https://github.com/processing/p5.js/blob/2920492842aae9a8bf1a779916893ac19d65cd38/src/math/calculation.js#L116-L119
+      function constrain(n, low, high) {
+        return Math.max(Math.min(n, high), low);
+      };
+      if (start2 < stop2) {
+        return constrain(newval, start2, stop2);
+      } else {
+        return constrain(newval, stop2, start2);
+      }
+    };
 
     function output(image,datauri,mimetype){