any hint on how to wrap around? i.e, when the object leaves the edge of the window, it emerges form the opposite edge

1. PVector pos, dir;
2.  
3. void setup() {
4.   size(600, 600);
5.   pos = new PVector(width/2, height/2);
6.   dir = new PVector(0, -10);
7.   strokeWeight(3);
8.   smooth();
9. }
10.  
11. void draw() {
12.   background(255);
13.   translate(pos.x, pos.y);
14.   rotate(atan2(dir.y, dir.x));
15.   triangle(-10, -15, -10, 15, 20, 0);
16. }
17.  
18. void keyPressed() {
19.   if (keyCode == UP) { pos.add(dir); wrap(); }
20.   if (keyCode == DOWN) { pos.sub(dir); wrap(); }
21.   if (keyCode == LEFT) { rotate2D(dir, radians(-5)); }
22.   if (keyCode == RIGHT) { rotate2D(dir, radians(5)); }
23. }
24.  
25. void wrap() {
26.   if (pos.x > width) { pos.x = 0; }
27.   if (pos.x < 0) { pos.x = width; }
28.   if (pos.y > height) { pos.y = 0; }
29.   if (pos.y < 0) { pos.y = height; }
30. }
31.  
32. void rotate2D(PVector v, float theta) {
33.   float xTemp = v.x;
34.   v.x = v.x*cos(theta) - v.y*sin(theta);
35.   v.y = xTemp*sin(theta) + v.y*cos(theta);
36. }