基于cocos2dx的RPG简单实用算法之3 - 多角色跟随阵型移动

1. 确定到一个阵型中心对象。

也许是一个英雄，也可以是一个隐藏的对象。也就是下文种的 GridCenter

2. 预先计算号每个阵型“槽” 相对中心对象的 向量。

void GameControlManager::startGridMode()
{
if(m_MainScene->heroList.empty())
return;
m_IsStartGridMode = true;
Point GridCenter = findGridCenter();
if(memberNumber == 1)
return;
else if(memberNumber == 2)
{
// 0
// 1
originRelativeVec[0] = Vec2(0,Grid_Slot_Radius);
originRelativeVec[1] = Vec2(0,-Grid_Slot_Radius);
}
else if(memberNumber == 3)
{
Point firstPos = GridCenter + Vec2(0,Grid_Slot_Radius);
Point secondPos = firstPos.rotateByAngle(GridCenter,CC_DEGREES_TO_RADIANS(-120));
Point thirdPos = secondPos.rotateByAngle(GridCenter,CC_DEGREES_TO_RADIANS(-120));

// 0
//
// 1 2
originRelativeVec[0] = firstPos - GridCenter;
originRelativeVec[1] = secondPos - GridCenter;
originRelativeVec[2] = thirdPos - GridCenter;
}
else if(memberNumber == 4)
{
Point firstPos = GridCenter + Vec2(0,CC_DEGREES_TO_RADIANS(-90));
Point thirdPos = secondPos.rotateByAngle(GridCenter,CC_DEGREES_TO_RADIANS(-90));
Point fourthPos = thirdPos.rotateByAngle(GridCenter,CC_DEGREES_TO_RADIANS(-90));

// 0 战士
// 1 2 猎人 法师
// 3 牧师
originRelativeVec[0] = firstPos - GridCenter;
originRelativeVec[1] = fourthPos - GridCenter;
originRelativeVec[2] = secondPos - GridCenter;
originRelativeVec[3] = thirdPos - GridCenter;
}

//认领slot位置
int slotIndex = 0;
int minSpeed = 999;
for(auto hero : m_MainScene->heroList) //已经排序
{
if(!hero->getIsAlly() && !hero->getIsDead())
{
hero->setSlotIndex(slotIndex);
slotIndex ++;

auto actorInfo = GameData::getActorInfoFromMap(hero->getUnitID());
if(actorInfo->speed < minSpeed)
minSpeed = actorInfo->speed;
}
}

3. 根据一号英雄相对中心对象的方向来确定阵型初始朝向

Point firstmanPos = m_MainScene->heroList.front()->getCenterPoint();
// crossover_point(firstmanPos,GridCenter,)

Vec2 heroVec = firstmanPos - GridCenter;
heroVec.normalize();
m_GridAngle = getDirectionByChief(heroVec);

for(int index = 0; index < memberNumber; index++)
{
Vec2 cur = originRelativeVec[index];
Point curPoint = cur + GridCenter;
curPoint = curPoint.rotateByAngle(GridCenter,m_GridAngle);
cur = curPoint - GridCenter;
slotRelativeVec[index] = cur;
}

4. 所有英雄各就各位

for(auto hero : m_MainScene->heroList)
{
if(!hero->getIsAlly() && !hero->getIsDead())
{
Vec2 curVec = slotRelativeVec[hero->getSlotIndex()];
Point des = GridCenter + curVec;
hero->setDestinationPoint(des);
}
}
....
}

5. 当阵型移动，根据 ”中心对象“相对目的地位置 targetPos来更新阵型朝向角度GridAngle

再根据GridAngle刷新 每个槽的相对向量 cur

void GameControlManager::setGridDirection(Point targetPos)
{
//更新阵型朝向
auto GridCenter = getGridCenter();
Vec2 chiefVec = targetPos - GridCenter;
chiefVec.normalize();
m_GridAngle = getDirectionByChief(chiefVec);
for(int index = 0; index < memberNumber; index++)
{
Vec2 cur = originRelativeVec[index];
Point curPoint = cur + m_gridObject->getPosition();
curPoint = curPoint.rotateByAngle(m_gridObject->getPosition(),m_GridAngle); //在原基础上旋转
cur = curPoint - m_gridObject->getPosition();
slotRelativeVec[index] = cur;
}
m_gridObject->setRotation(CC_RADIANS_TO_DEGREES(-m_GridAngle));
}

6. 每一帧让角色移动到自己对应的槽

void GameControlManager::updateGridDirection() { Point slot = getSlotPosByIndex(hero->getSlotIndex()); if(hero->getCenterPoint().distance(slot) > getElasticRange()) { hero->moveToward(slot); } }

（编辑：李大同）

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