Drawing a disk shape

This has per say nothing to do whit bukkitplugins but related never the less.
I have tryed to to generate circles out wards but the results in holes, so i thought i look at the //cyl from world edit(fantastic plugin ) but got some interesting results to say the least http://imgur.com/um7mZ.

Code:

 public int makeCylinder(Vector pos, int radius,int height,Player player)
  {
  int x = 0;
  int z = radius;
  int d = (5 - radius * 4) / 4;
  int affected = 0;

  if (height == 0)
    return 0;
  if (height < 0) {
    height = -height;
    pos = pos.subtract(new Vector(0, height, 0));
  }

  if (pos.getBlockY() - height - 1 < 0)
    height = pos.getBlockY() + 1;
  else if (pos.getBlockY() + height - 1 > 127) {
    height = 127 - pos.getBlockY() + 1;
  }

  affected += makeCylinderPoints(pos, x, z, height,player);

  while (x < z) {
    x++;

    if (d >= 0) {
      z--;
      d += 2 * (x - z) + 1;
    } else {
      d += 2 * x + 1;
    }

    affected += makeCylinderPoints(pos, x, z, height,player);
  }

  return affected;
  }
    private int makeCylinderPoints(Vector center, int x, int z,int height,Player player)
  {
    int affected = 0;
    Vector pos;
    if (x == z) {
        for (int y = 0; y < height; y++)
        {
            for (int z2 = -z; z2 <= z; z2++) {
                pos=center.add(new Vector(x,y,z2));
                player.getWorld().getBlockAt(pos.getBlockX(),pos.getBlockY(),pos.getBlockZ()).getFace(BlockFace.DOWN, 1).setType(Material.CLAY);
                pos=center.add(new Vector(-x,y,z2));
                player.getWorld().getBlockAt(pos.getBlockX(),pos.getBlockY(),pos.getBlockZ()).getFace(BlockFace.DOWN, 1).setType(Material.CLAY);
                affected += 2;
            }
        }
    }
    else if (x < z) {
        for (int y = 0; y < height; y++) {
            for (int x2 = -x; x2 <= x; x2++) {
                for (int z2 = -z; z2 <= z; z2++) {
                    pos=center.add(new Vector(x2,y,z2));
                    player.getWorld().getBlockAt(pos.getBlockX(),pos.getBlockY(),pos.getBlockZ()).getFace(BlockFace.DOWN, 1).setType(Material.CLAY);
                    affected++;
                }
                pos=center.add(new Vector(z,y,x2));
                player.getWorld().getBlockAt(pos.getBlockX(),pos.getBlockY(),pos.getBlockZ()).getFace(BlockFace.DOWN, 1).setType(Material.CLAY);
                pos=center.add(new Vector(-z,y,x2));
                player.getWorld().getBlockAt(pos.getBlockX(),pos.getBlockY(),pos.getBlockZ()).getFace(BlockFace.DOWN, 1).setType(Material.CLAY);
                affected += 2;
            }
        }
    }
    return affected;
  }

Thats code i'm using, if some one cud give me some pointer's id appreciate it.

I also tried to calculate what i should render in a square by applying some geometry but i din't get a good circle from that.

Code:

private void RenderCircle(int blockX, int blockZ, int Radian, Player player) {
        int startx,startz;
        player.sendMessage("in RenderCircle");
            for (int i = blockX-Radian; i <= Radian+blockX; i++) {
                for (int j = blockZ-Radian; j < Radian+blockZ; j++) {
                    player.sendMessage("genChunk bool: "+Chunkgen.genchunk);
                       if (Chunkgen.genchunk==true) {
                           int hyp=(int) Math.rint(Math.sqrt(Math.pow(Math.abs(i-blockX), 2)+Math.pow(Math.abs(j-blockZ), 2)));
                           player.sendMessage("Radina: "+Radian+" Hyp:"+hyp);
                           player.sendMessage("Shuld generating chunk: "+i+":"+j);
                           if(hyp<=Radian)
                           {
                               player.sendMessage("generating chunk: "+i+":"+j);
                               player.getWorld().getBlockAt(i,player.getLocation().getBlockY(),j).getFace(BlockFace.DOWN, 1).setType(Material.BRICK);
                        }
                    }else{
                        lastPoint = new Point(i,j);
                        break;
                    }
                }
                if(Radian-blockX==i)
                    lastPoint=null;
                if (Chunkgen.genchunk==false)
                    break;
            }
    }