wall generation

int radius = getWidth()/2;
int precis = 16;
for(int dir=0;dir<360;dir+=360/precis) {
    int i=(int) Math.floor(x+Math.cos(Math.toRadians(dir))*radius);
    int j=(int) Math.floor(z+Math.sin(Math.toRadians(dir))*radius);
    buildWall(world, i, j, y, theme, random);
}