1. 
   
2. 
   
3. import processing.serial.*;
4. Serial port;
5. int x=0;
6. int y=0;
7. int i=0; 
8.  
9. void setup(){
10.      size(45,45);
11.      port = new Serial(this,Serial.list()[1], 9600);
12.             }
13. 
    
14. 
    
15. void draw() {
16.   
17.         while (port.available() > 0) {
18. 
    
19.          String inByteRED = port.readStringUntil(10);
20.          if (inByteRED != null) {
21.          int numRed=int(inByteRED);
22.          println("inByteRED");
23.          println(numRed);
24.        }
25.          
26.          String inByteGREEN = port.readStringUntil(10);
27.          if (inByteGREEN != null) {
28.          int numGreen=int(inByteGREEN);
29.          println("inByteGREEN");
30.          println(numGreen);
31.         }
32. 
    
33.          String inByteBLUE = port.readStringUntil(10);
34.          if (inByteBLUE != null) {
35.          int numBlue=int(inByteBLUE);
36.          println("inByteBLUE");
37.          println(numBlue);
38.         }
39.         
40.         }
41.  port.clear();
42. }
43. 
    

I have the piece of code below. After a number of steps lets say, after drawing 100 lines, I would like to delete the line that I drew first then the second etc. and my script continues infinitely by drawing and deleting.Can somebody suggest how I can achieve this?any hints highly appreciated.