Or directly, without putting them in an array, something like this...

1.   String[] Greenline = loadStrings("Greenline.txt");
2.   // etc.
3.   beginShape();
4.   for (int i=0; i<Greenline.length; i++) {
5.     float[] values = float(split(Greenline[i], "," )); // not recommended, should be done once in setup()
   
6.     vertex(values[0],1000-values[1]);
7.   }
8.   endShape();

Note that you must do the loading in setup() once (for example loading images, fonts, textfiles). And you should pre-compute everything else you can do once in setup() as well (for example splitting strings, turning them into floats etc.). You should only do the things you need to do continuously in draw() (for example drawing the shape from the coordinates).

ONLY ONE DOT IS BEING DRAW.... BUT NO LINE.... WONDERING WHY...

WHOLE CODE:

2. Regions regions;
3. //Attractors[] attractors = new Attractors[1000];
4. //AtLines[] atLines = new AtLines[1000];
5. 
   
6. void setup() {
7.   size(1200, 1000);
8.   smooth();
9. //  for(int i = 0; i<attractors.length;i++){
10.  // attractors[i] = new Attractors();
11.   //atLines[i] = new AtLines();
12.  // }
13.   background(255);
14. }
15. 
    
16. void draw() {
17. 
    
18.   
19.   
20. 
    
21.   String[] Churhes = loadStrings("Churhes.txt"); 
22.   String[] Mosque = loadStrings("Mosque.txt"); 
23.   String[] Greenline = loadStrings("Greenline.txt"); 
24.   String[] Suni_siitai_line = loadStrings("Suni_siitai_line.txt"); 
25.   
26. 
    
27.   
28. stroke(1);    
29. beginShape();
30. 
    
31.   for (int j=0; j<Greenline.length; j++) {
32.     float[] values = float(split(Greenline[j], "," )); // not recommended, should be done once in setup()
33.     vertex(values[0],1000-values[1]);
34. //  }
35.   endShape();
36. 
    
37.   }
38. }

ANY REASON WHY VECTORS INSTEAD OF PIXEL COORDINATES?

The reason I am using capslock, is that my keyboard is broken, sometimes it randomly procuces key "q", it is so annoying....:)