/**
* 引数の条件に合致した置き石を返します。
*
* @param sgfSize
* @param handicap
* @throws IllegalArgumentException sgfSizeが正方形以外でnumberが2以上の場合
* @return 置き石の座標。NOT NULL
*/
private static Set<SgfPoint> composeHandicapStone(SgfSize sgfSize, Handicap handicap) {
int hd = handicap.getIntValue();
if (hd < 2) {
return Collections.emptySet();
}
if (sgfSize.width() != sgfSize.height()) {
throw new IllegalArgumentException();
}
Set<SgfPoint> pointSet = new HashSet<SgfPoint>(9);
final int size = sgfSize.width();
int left = size + 1, middle = size + 1, right = size + 1;
if (size < 9) {
left = size / 5 + 1;
right = size - left + 1;
middle = size / 2 + 1;
} else if (size < 13) {
left = 3;
right = size - left + 1;
middle = size / 2 + 1;
} else {
left = 4;
right = size - left + 1;
middle = size / 2 + 1;
}
switch (hd) {
case 9:
pointSet.add(SgfPoint.create(sgfSize, middle, left));
pointSet.add(SgfPoint.create(sgfSize, middle, right));
case 7:
pointSet.add(SgfPoint.create(sgfSize, right, middle));
pointSet.add(SgfPoint.create(sgfSize, left, middle));
case 5:
pointSet.add(SgfPoint.create(sgfSize, middle, middle));
case 4:
pointSet.add(SgfPoint.create(sgfSize, right, right));
case 3:
pointSet.add(SgfPoint.create(sgfSize, left, left));
case 2:
pointSet.add(SgfPoint.create(sgfSize, right, left));
pointSet.add(SgfPoint.create(sgfSize, left, right));
break;
case 8:
pointSet.add(SgfPoint.create(sgfSize, middle, left));
pointSet.add(SgfPoint.create(sgfSize, middle, right));
case 6:
pointSet.add(SgfPoint.create(sgfSize, right, middle));
pointSet.add(SgfPoint.create(sgfSize, left, middle));
pointSet.add(SgfPoint.create(sgfSize, right, right));
pointSet.add(SgfPoint.create(sgfSize, left, left));
pointSet.add(SgfPoint.create(sgfSize, right, left));
pointSet.add(SgfPoint.create(sgfSize, left, right));
}
return pointSet;
}
