Create endless grid spiral in java -

i want create endless spiral in java this:

i want send integer 1-∞ number , it's spiral map. example:

getxzformap(0); ----> (0;0)

getxzformap(5); ----> (-1;0)

came code now, not know how go further:

public int[] getxzformap(int i){      int[] k = new int[2];      if(i > 0){          double s = i/8;         int stage = (int) math.ceil(s);         int corner_size = ((stage*8)+4)/4;        }     else{         k[0] = 0;         k[1] = 0;     }      return k; } 

import java.util.scanner;  class spiral  {     private static string getxzformap(int np)     {                  // (dx, dy) vector - direction in move right         int dx = 0;         int dy = 1;         // length of current segment         int segment_length = 1;          // current position (x, y) , how of current segment passed         int x = 0;         int y = 0;         int segment_passed = 0;         if (np == 0){             return ("(" + y + ";" + x + ")");         }         (int n = 0; n < np; ++n) {             // make step, add 'direction' vector (dx, dy) current position (x, y)             x += dx;             y += dy;             ++segment_passed;              if (segment_passed == segment_length) {                 // done current segment                 segment_passed = 0;                  // 'rotate' directions                 int buffer = dy;                 dy = -dx;                 dx = buffer;                  // increase segment length if necessary                 if (dx == 0) {                     ++segment_length;                 }             }         }         return("(" + y + ";" + x + ")");     }      public static void main(string[] args){          scanner sc = new scanner(system.in);         int number_of_points = integer.valueof(args[0]);   // or delete line           string spiral_map = getxzformap(number_of_points); // , put int here         system.out.println(spiral_map);     }  } 

adapted answer: algorithm iterating on outward spiral on discrete 2d grid origin

demo:

$ java spiral 0 (0;0) $ java spiral 5 (-1;0)