I'd like to get this app working with my arduino:

2. import toxi.geom.*;
3. import toxi.geom.mesh2d.*;
4.  
5. // empty voronoi mesh container
6. Voronoi voronoi = new Voronoi();
7.  
8. // switches
9. boolean doShowPoints = false;
10. boolean doShowDelaunay;
11.  
12. void setup() {
13.   size(600, 600);
14.   smooth();
15.   textFont(createFont("SansSerif", 10));
16. }
17.  
18. void draw() {
19.   background(255);
20.   stroke(0);
21.   noFill();
22.  
23.   // draw delaunay triangulation
24.   if (doShowDelaunay) {
25.     stroke(0, 0, 255, 50);
26.     beginShape(TRIANGLES);
27.     for (Triangle2D t : voronoi.getTriangles()) {
28.       triangle(t.a.x, t.a.y, t.b.x, t.b.y, t.c.x, t.c.y);
29.     }
30.     endShape();
31.   }else {
32.     // draw all voronoi polygons, clip them if needed...
33.     for (Polygon2D poly : voronoi.getRegions()) {
34.       beginShape();
35.       for(Vec2D vector : poly.vertices){
36.         vertex(vector.x,vector.y);
37.       }
38.       endShape(CLOSE);
39.     }
40.   }
41.   // draw original points added to voronoi
42.   if (doShowPoints) {
43.     fill(255, 0, 255);
44.     noStroke();
45.     for (Vec2D c : voronoi.getSites()) {
46.       ellipse(c.x, c.y, 5, 5);
47.     }
48.   }
49. 
    
50.    
51.   if(!online)saveFrame("frame.png");
52. }
53.  
54. void keyPressed() {
55.   switch(key) {
56.   case 'x':
57.     voronoi = new Voronoi();
58.     break;
59.   case 'r':
60.     for (int i = 0; i < 10; i++) {
61.       voronoi.addPoint(new Vec2D(random(width), random(height)));
62.     }
63.     break;
64.   }
65. }

I've already written a code for arduino that writes 'r' and 'x' while pressing down buttons. But I don't know how to get the two codes working together.

Here is the arduino code:

2. int swiPin [] = {2, 3};
3. boolean currentButtonVal[2];
4. 
   
5. //Grouping of combinations
6. int groupA;
7. 
   
8. void setup(){
9.   for(int x = 0; x<2; x++){
10.    pinMode(swiPin[x], INPUT);
11.    digitalWrite(swiPin[x], HIGH);
12.    currentButtonVal[x] = HIGH;
13.   }
14.   Serial.begin(9600);
15. }
16. 
    
17. void check_fingering(){
18.    //Check keys pressed
19.    groupA = 1*(!debounce(0)) + 2*(!debounce(1)) + 4*(!debounce(2)) + 8*(!debounce(3));
20. }
21. 
    
22. boolean debounce(int thisButton) {
23.   boolean current = digitalRead(swiPin[thisButton]);
24.   if (currentButtonVal[thisButton] != current) {
25.     delay(5);
26.     current = digitalRead(swiPin[thisButton]);
27.   }
28.   currentButtonVal[thisButton] = current;  // store new state for your pin
29.   return current;
30. }
31. 
    
32. void loop(){
33.   check_fingering();
34.   if (groupA == 1){
35.   Serial.println("x");
36.   Serial.flush();
37.   }
38.   else if (groupA == 2){
39.   Serial.println("r");
40.   Serial.flush();
41.   }
42.  
43. }

Thank you for your help.