Map function worked in Processing 2 and early 3.. But broke in 3.5.3. Need guidance

Processing Electronics (Arduino, etc.)
2
  • Mutating the sketch’s main canvas outside the “Animation Thread” crashes the program! :boom:
  • Callback serialEvent() is run by the Serial’s Thread btW. :warning:
  • So even calling something like background() can be fatal! :fearful:
  • Actually, due to a bad design, any Processing function which depends on color() will get wrong results when they’re multithreading invoked! :bug:
  • So any canvas mutating operations should be moved to draw() or called by it. :face_with_monocle:
  • Here’s a post link for a bare minimum Serial data receiver demo: :angel: 
/**
 * Efficient Serial Reading (v1.02)
 * GoToLoop (2016-Jan-19)
 *
 * Forum.Processing.org/two/discussion/14534/
 * myport-available-always-0#Item_1
 *
 * Forum.Processing.org/two/discussion/16618/
 * processing-with-arduino-void-serialevent#Item_5
 *
 * Discourse.Processing.org/t/
 * map-function-worked-in-processing-2-and-early-3-
 * but-broke-in-3-5-3-need-guidance/11371/2
 */
 
import processing.serial.Serial;
 
static final int PORT_INDEX = 0, BAUDS = 9600;
String myString = "";
 
void setup() {
  noLoop();
  final String[] ports = Serial.list();
  printArray(ports);
  new Serial(this, ports[PORT_INDEX], BAUDS).bufferUntil(ENTER);
}
 
void draw() {
  println(myString);
}
 
void serialEvent(final Serial s) {
  myString = s.readString().trim();
  redraw = true;
}
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