子弹类：
Bullet* Bullet::create(float attack,Vec2 startPos,Vec2 endPos)
{
Bullet* pRet = new Bullet();
pRet->_attack = attack; //攻击力
pRet->_startPos = startPos; //起点和终点
pRet->_endPos = endPos;
if (pRet && pRet->init())
{
pRet->autorelease();
return pRet;
}
else
{
delete pRet;
pRet = NULL;
return NULL;
}
}
bool Bullet::init()
{
if (!Layer::init())
{
return false;
}
Size visibleSize = Director::getInstance()->getVisibleSize();
_bullet = Sprite::create("pd/baizhanche.png");
Vec2 dtPos = _endPos - _startPos;
float rotation = CC_RADIANS_TO_DEGREES(Vec2::angle(dtPos,Vec2(1,0))); //弧度转为角度，现在是点击点与起点和横轴的夹角
if (dtPos.y > 0) //点击的点在武将位置的上方
rotation = -rotation;
float dt = _endPos.distance(_startPos);
_bullet->setRotation(_bullet->getRotation() + rotation);
this->setPosition(_startPos);
_bullet->setPosition(Vec2(0,0));
auto done = CallFuncN::create([=](Ref* ref)
{
this->removeFromParentAndCleanup(true);
});
this->runAction(Sequence::create(MoveBy::create(2,dtPos*(visibleSize.width * 2 / dt)),done,NULL));
addChild(_bullet,0);
return true;
}
Rect Bullet::getRect()
{
<span style="white-space:pre"> </span>Rect a = _bullet->getTextureRect();
<span style="white-space:pre"> </span>float minX = this->getPosition().x - a.getMaxX() * 0.5; //最左的边
<span style="white-space:pre"> </span>float minY = this->getPosition().y - a.getMaxY() * 0.5; //最下的边
<span style="white-space:pre"> </span>Rect b = Rect(minX,minY,a.getMaxX(),a.getMaxY());
<span style="white-space:pre"> </span>return b;
}
另如果想实现匀速运动（因为MoveTo MoveBy都是按照固定的时间来运动）：
void Bullet::kaihuo(Point pos)
{
float xdistance = (pos.x - this->getPosition().x);
float ydistance = (pos.y - this->getPosition().y);
_radii = atan2(ydistance,xdistance);
scheduleUpdate();
}
void Bullet::update(float dt)
{
_time += dt;
this->setPosition(Vec2(_pos.x + BULLETSPEED * _time * cos(_radii),_pos.y + BULLETSPEED * _time * sin(_radii)));
}
另：
getBoundingBox 中得 Size.width .height 显示图片真实大小 (考虑缩放和不缩放)
getContentSize 纹理图片大小
getTextureRect 当前的纹理在总纹理的位置 (不考虑 缩放不缩放)
图片有缩放 就用 getBoundingBox ，不考虑缩放用 getContentSize
