Hi

I wanna load a txt file and write some more data to it. I would need to combine the vals[0] with x.[i]... (i guess).
But I am not sure how to to bring them together, so that if I save and start the sketch again, x[] or y[] are getting always bigger... Simplified, draw, save, load and continue to draw...
Right now, I am just able to load the drawing from the previous running... but not to add more to the file...

1. int[] x = new int[0];
2. int[] y = new int[0];
3. String[] loadLines;
4. float [] vals;
5. void setup() {
6.   size(300, 300);
7. }
8. void draw() {
9.   background(204);
10.   stroke(0);
11.   noFill();
12.  
13.   beginShape();
14.   loadLines = loadStrings("lines.txt");
15.   for(int i = 0; i < loadLines.length; i++){
16.      vals = float(split(loadLines[i], "\t"));
17.      vertex(vals[0], vals[1]);  
18.   }
19.   endShape();
20.  
21.   beginShape();
22.   for (int i = 0; i < x.length; i++) {
23.     vertex(x[i], y[i]);
24.   }
25.   endShape();
26.  
27.   if (x.length >= 1) {
28.     stroke(255);
29.     line(mouseX, mouseY, x[x.length-1], y[x.length-1]);
30.   }
31. }
32. void mousePressed() {
33.   x = append(x, mouseX);
34.   y = append(y, mouseY); 
35. }
36. void keyPressed() {
    
37.   String[] lines = new String[x.length];
38.   for (int i = 0; i < x.length; i++) {
39.     lines[i] = x[i] +"\t" + y[i]; // "\t"
40.   }
41.   saveStrings("lines.txt", lines);
42.   exit(); // Stop the program
43. }

thanks!!!