bool BaseDemo::onTouchBegan(Touch* touch, Event* event)
{
auto location = touch->getLocation();
auto shapeArr = _world->getShapes(location);
PhysicsBody* body = nullptr;
for(auto& obj : shapeArr)
{
if((obj->getBody()->getTag() & DRAG_BODYS_TAG) != 0)
{
body = obj->getBody();
break;
}
}
if(body != nullptr)
{
Node* mouse = Node::create();
mouse->setPhysicsBody(PhysicsBody::create(PHYSICS_INFINITY, PHYSICS_INFINITY));
mouse->getPhysicsBody()->setDynamic(false);
mouse->setPosition(location);
this->addChild(mouse);
PhysicsJointPin* joint = PhysicsJointPin::construct(mouse->getPhysicsBody(), body, location);
joint->setMaxForce(5000.0f * body->getMass());
_world->addJoint(joint);
_mouses.insert(std::make_pair(touch->getID(), mouse));
return true;
}
return false;
}
bool HelloWorld::onTouchBegan(cocos2d::Touch *touch, cocos2d::Event *event)
{
CCLOG("%s", "touch");
auto location = touch->getLocation();
auto arr = _scene->getPhysicsWorld()->getShapes(location);//从物理世界得到多边形
PhysicsBody *body = nullptr;
for (auto &obj : arr)
{
if ((obj->getBody()->getTag() & DRAG_BODYS_TAG) != 0) //得到刚体
{
body = obj->getBody();
break;
}
}
if (body != nullptr)
{
//创建一个刚体
Node *mouse = Node::create();
mouse->setPhysicsBody(PhysicsBody::create(PHYSICS_INFINITY, PHYSICS_INFINITY));
mouse->getPhysicsBody()->setDynamic(false);
mouse->setPosition(location);
this->addChild(mouse);
body->setLinearDamping(0.0f);
//用图钉关节与点中刚体绑定 赋予力 可以拖动
PhysicsJointPin *joint = PhysicsJointPin::construct(mouse->getPhysicsBody(), body, location);
joint->setMaxForce(5000.0f * body->getMass());
_scene->getPhysicsWorld()->addJoint(joint);
_mouses.insert(std::make_pair(touch->getID(), mouse));
return true;
}
return false;
}
PhysicsJointPin* PhysicsJointPin::construct(PhysicsBody* a, PhysicsBody* b, const Vec2& anchr)
{
PhysicsJointPin* joint = new (std::nothrow) PhysicsJointPin();
if (joint && joint->init(a, b, anchr))
{
return joint;
}
CC_SAFE_DELETE(joint);
return nullptr;
}
void PivotJointScene::onEnter()
{
BaseDemo::onEnter();
auto visibleSize = VisibleRect::getVisibleRect().size;
float pierPosY = 100.0f;
Sprite* bridgePierL = createBox(Point(visibleSize.width/2 - 400, pierPosY), Size(40, 40));
Sprite* bridgePierR = createBox(Point(visibleSize.width/2 + 400, pierPosY), Size(40, 40));
bridgePierL->setRotation(0);
bridgePierR->setRotation(0);
bridgePierL->getPhysicsBody()->setDynamic(false);
bridgePierR->getPhysicsBody()->setDynamic(false);
bridgePierL->getPhysicsBody()->setTag(0);
bridgePierR->getPhysicsBody()->setTag(0);
this->addChild(bridgePierL);
this->addChild(bridgePierR);
float ballRadius = 40.0f;
Sprite* fallingBall = createBall(Point(visibleSize.width/2, visibleSize.height-ballRadius), ballRadius);
this->addChild(fallingBall);
Vector<Sprite*> bamboos;
for (int i = 0; i < BAMBOO_SEGMENTS_NUM; i++)
{
auto box = createBox(Point(bridgePierL->getPositionX() + BAMBOO_SEGMENT_SIZE.width * i, pierPosY), BAMBOO_SEGMENT_SIZE);
box->setRotation(0);
this->addChild(box);
bamboos.pushBack(box);
}
PhysicsJointPin* pinJointL = PhysicsJointPin::construct(bridgePierL->getPhysicsBody(), bamboos.front()->getPhysicsBody(),bridgePierL->getPosition());
PhysicsJointPin* pinJointR = PhysicsJointPin::construct(bridgePierR->getPhysicsBody(), bamboos.back()->getPhysicsBody(),bridgePierR->getPosition());
pinJointL->setCollisionEnable(false);
pinJointR->setCollisionEnable(false);
_world->addJoint(pinJointL);
_world->addJoint(pinJointR);
for (int i = 0; i < BAMBOO_SEGMENTS_NUM - 1; i++)
{
auto body1 = bamboos.at(i)->getPhysicsBody();
auto body2 = bamboos.at(i+1)->getPhysicsBody();
PhysicsJointPin* pivotJointUp = PhysicsJointPin::construct(body1, body2, bamboos.at(i+1)->getPosition() + Point(-BAMBOO_SEGMENT_SIZE.width/2, BAMBOO_SEGMENT_SIZE.height/2));
PhysicsJointPin* pivotJointDown = PhysicsJointPin::construct(body1, body2, bamboos.at(i+1)->getPosition() + Point(-BAMBOO_SEGMENT_SIZE.width/2, -BAMBOO_SEGMENT_SIZE.height/2));
PhysicsJointRotarySpring* springJoint = PhysicsJointRotarySpring::construct(body1, body2, 2000, 0.8f);
pivotJointUp->setCollisionEnable(false);
pivotJointDown->setCollisionEnable(false);
springJoint->setCollisionEnable(false);
_world->addJoint(pivotJointUp);
_world->addJoint(pivotJointDown);
_world->addJoint(springJoint);
}
}
