gesture control interface

Hello everyone;
currently I'm making a gestural interface & for that I'm feeding a data from the Arduino serially to the  processing & making a blob for the tracking purpose. I need the mouse cursor to follow the blob . Down here is the code with out cursor following function.:

1. import fullscreen.*;
2. import processing.serial.*;
3. FullScreen fs;
4. Serial port;
5. String X_data = "";
6. String Y_data = "";
7. String data = "";
8.  
9. int index= 0;
10. int x = 0;
11. int y = 0;
12. PFont font;
13. PImage img;
14. void setup()
15. {
16.   size(1400, 770);
17.  
18.   fs = new FullScreen(this);
19.   fs.enter();
20.  
21.   img = loadImage("heading.png");
22.  
23.   port = new Serial(this, "COM3", 9600);
24.   port.bufferUntil('.');
25.  
26.   font = loadFont("AgencyFB-Reg-30.vlw");
27.   textFont(font, 30);
28.  
29.   smooth();
30.   noStroke();
31. }
32. void draw()
33. {
34.   //background(140, 140, 140);
35.   background(0);
36.  
37.   //image(img, 25, 10, img.width/2, img.height/2);
38.  
39.  ////////////////////////////////////////////
40.  
41.   fill(30, 30, 30);
42.   rect(20, 50, 260, 40);
43.  
44.   fill(255);
45.   text("X : ", 45, 81);
46.   fill(5, 130, 255);
47.   text(x, 75, 82);
48.  
49.   fill(255);
50.   text("Y : ", 165, 81);
51.   fill(5, 130, 255);
52.   text(y, 195, 82);
53.  
54.   fill(128, 0, 0);
55.   ellipse(250, 70, 15, 15);
56.  
57.   fill(128, 0, 0);
58.   ellipse(x, y, 15, 15);
59. }
60. void serialEvent (Serial port)
61. {
62.   data = port.readStringUntil('.');
63.   data = data.substring(0, data.length() - 1);
64.  
65.   index = data.indexOf(",");
66.   X_data = data.substring(0, index);
67.   X_data = trim(X_data);
68.   x = int(X_data);
69.  
70.   Y_data = data.substring(index+1, data.length());
71.   Y_data = trim(Y_data);
72.   y = int(Y_data);
73. }

Can anybody help me with this?
Advanced thanks  

& here is the snap shot of the tracking interface: