/**
* 按照权重随机一个对象
*
* @param objList
* @param objWeight
* @return
*/
public static <T> T randonWeightObject(List<T> objList, List<Integer> objWeight) {
if (objList == null || objWeight == null || objList.size() != objWeight.size()) {
throw new RuntimeException("random weight object exception");
}
// 累加权重
int totalWeight = 0;
List<Integer> fmtWeight = new ArrayList<Integer>(objWeight.size());
for (int i = 0; i < objWeight.size(); i++) {
totalWeight += objWeight.get(i);
fmtWeight.add(totalWeight);
}
try {
int randomWeight = GameRand.randInt(1, totalWeight);
for (int i = 0; i < fmtWeight.size(); i++) {
if (randomWeight <= fmtWeight.get(i)) {
return objList.get(i);
}
}
} catch (Exception e) {
GameMonitor.catchException(e);
}
return null;
}
/**
* 队列乱序
*
* @param objList
*/
public static <T> void randomOrder(List<T> objList, int calcTimes) {
for (int i = 0; i < calcTimes; i++) {
for (int j = 0; j < objList.size(); j++) {
try {
int exchangeIdx = GameRand.randInt(0, objList.size() - 1);
if (exchangeIdx != j) {
T obj = objList.get(j);
objList.set(j, objList.get(exchangeIdx));
objList.set(exchangeIdx, obj);
}
} catch (Exception e) {
GameMonitor.catchException(e);
}
}
}
}
/**
* 按照权重随机n个对象
*
* @param objList
* @param objWeight
* @return
*/
public static <T> List<T> randonWeightObject(
List<T> objList, List<Integer> objWeight, int count) {
if (objList == null
|| objWeight == null
|| count <= 0
|| objList.size() != objWeight.size()
|| count > objList.size()) {
throw new RuntimeException("random weight object exception");
}
List<Integer> objWeightStub = new ArrayList<Integer>(objWeight.size());
objWeightStub.addAll(objWeight);
List<T> selObjList = new ArrayList<T>(count);
while (selObjList.size() < count) {
// 累加权重
int totalWeight = 0;
List<Integer> fmtWeight = new ArrayList<Integer>(objWeightStub.size());
for (int i = 0; i < objWeightStub.size(); i++) {
totalWeight += objWeightStub.get(i);
fmtWeight.add(totalWeight);
}
try {
int randomWeight = GameRand.randInt(1, totalWeight);
for (int i = 0; i < fmtWeight.size(); i++) {
if (randomWeight <= fmtWeight.get(i)) {
selObjList.add(objList.get(i));
objWeightStub.set(i, 0);
break;
}
}
} catch (Exception e) {
GameMonitor.catchException(e);
}
}
return selObjList;
}