Code for Processing

/*

import processing.serial.*;

Serial myPort;

int r;

void setup() {

 println("Start15:59, 23 November 2021 (UTC)15:59, 23 November 2021 (UTC)15:59, 23 November 2021 (UTC)15:59, 23 November 2021 (UTC)15:59, 23 November 2021 (UTC)15:59, 23 November 2021 (UTC)15:59, 23 November 2021 (UTC)~~");

 size(600, 600);        // window size

 randomSeed(second());  // initialize random number

 r = width;

 println(Serial.list());

 myPort = new Serial(this, Serial.list()[2], 9600);
 myPort.bufferUntil('\n');                          // store data in buffer
 

}

void draw()

{ 
 background(255);

 fill(random(0,255), random(0,255), random(0,255));  // fill with random color

 ellipse(width/2, height/2, r, r);                       // draw a circle

 line(width/2, 0, width/2, height);                  // draw a line

 line(0, height/2, width, height/2);                 // draw a line

 fill(0, 120);                                                  // black, transparency 120

 textAlign(CENTER, CENTER);

 textSize(r/2);

 text(r, width/2, height/2);                         // express distance in the window

(스케치 실행창에 거리측정값 표현)

}

void serialEvent(Serial p) { // Read Serial port value

 String response = p.readStringUntil('\n').trim();   // Read Stored Data

 r = int(response);

 r = constrain(r, 5, width) ;                        // r is MIN: 5 ~ MAX: width

}

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