public float generate(CA c, int start, int end, boolean stopOnSame, boolean over, Updater u) {
if (_b == null || _b.getWidth() != c.getWidth() || _b.getHeight() != c.getHeight()) {
_b = new CA(c.getWidth(), c.getHeight());
}
int times = end - start;
CA b1 = c, b2 = _b; // double buffer
// int[] sur = new int[_len*_len];
int[] sur = new int[_len - 1];
int dim = _len;
int offset = (dim - 1) / 2;
Selector sel = selector();
for (int t = 0; t < times; t++) {
for (int x = 0; x < b1.getWidth(); x++) {
for (int y = 0; y < b1.getHeight(); y++) {
int idx = 0;
int dx = x - offset;
int dy = y - offset;
if (false
&& dx >= 0
&& dy >= 0
&& dx + dim < b1.getWidth()
&& dy + dim < b1.getHeight()) {
b1.getBlock(sur, dx, dy, _len);
} else {
for (int i = x - 1; i <= x + 1; i++) {
for (int j = y - 1; j <= y + 1; j++) {
sur[idx++] = get(b1, i, j);
}
}
}
int n = sel.next(sur, 0);
if (n != -1) {
b2.set(x, y, _colors[n]);
if (_interceptor != null) {
_interceptor.set(x, y, _colors[n]);
}
// System.err.print(" "+n);
}
/*
int dx = x - offset;
int dy = y - offset;
if(dx>=0&&dy>=0&&dx+dim<b1.getWidth()&&dy+dim<b1.getHeight()) {
b1.getBlock(sur, dx, dy, _len);
}
int n = sel.next(sur, 0);
if(n!=-1) {
b2.set(x, y, n);
}
*/
}
}
// swap
CA temp = b1;
b1 = b2;
b2 = temp;
}
c.setData(b1.getData());
// System.err.print(".");
return 0f;
}