/** Decodes a symbol given any point (cx, cy) inside the center circle (bulls-eye) of the code. */
public int decode(Scanner scanner, int cx, int cy) {
int up =
(scanner.ydist(cx, cy, -1) + scanner.ydist(cx - 1, cy, -1) + scanner.ydist(cx + 1, cy, -1));
int down =
(scanner.ydist(cx, cy, 1) + scanner.ydist(cx - 1, cy, 1) + scanner.ydist(cx + 1, cy, 1));
int left =
(scanner.xdist(cx, cy, -1) + scanner.xdist(cx, cy - 1, -1) + scanner.xdist(cx, cy + 1, -1));
int right =
(scanner.xdist(cx, cy, 1) + scanner.xdist(cx, cy - 1, 1) + scanner.xdist(cx, cy + 1, 1));
this.x = cx;
this.y = cy;
this.x += (right - left) / 6.0f;
this.y += (down - up) / 6.0f;
this.unit = readUnit(scanner);
this.code = -1;
if (unit < 0) return -1;
int c = 0;
int maxc = 0;
float arca;
float maxa = 0;
float maxu = 0;
// -----------------------------------------
// Try different unit and arc adjustments,
// save the one that produces a maximum
// confidence reading...
// -----------------------------------------
for (int u = -2; u <= 2; u++) {
for (int a = 0; a < 10; a++) {
arca = a * ARC * 0.1f;
c = readCode(scanner, unit + (unit * 0.05f * u), arca);
if (c > maxc) {
maxc = c;
maxa = arca;
maxu = unit + (unit * 0.05f * u);
}
}
}
// One last call to readCode to reset orientation and code
if (maxc > 0) {
unit = maxu;
readCode(scanner, unit, maxa);
this.code = rotateLowest(code, maxa);
}
return this.code;
}
