Cocos2dx-无法设置速度= 0.0 [英] Cocos2dx - Unable to set velocity = 0.0
问题描述
我正在用cocos2dx做台球游戏.
首先,我使用此参数PhysicsMaterial(1.0f, 1.0f, 0.8f)
设置edgeBox
然后这两个球PhysicsMaterial(1.0f, 1.0f, 0.5f)
I'm making an pool game with cocos2dx.
First, i setup the edgeBox with this parameters PhysicsMaterial(1.0f, 1.0f, 0.8f)
And then these 2 balls PhysicsMaterial(1.0f, 1.0f, 0.5f)
在更新功能上,我希望通过不增加重力来逐渐降低球的运动时间(例如使地面产生摩擦)
physicsBody->setLinearDamping(0.3);
On the update function, i want slow down balls time by time without gravity (like making ground friction) by adding
physicsBody->setLinearDamping(0.3);
在更新功能上,我设置了最小速度,如果每个球的速度低于15,则将速度重置为0,0
On the update function, i set the minimum velocity, if the velocity of each ball reaches lower than 15, reset velocity to 0,0
auto MV = 15;
auto v1 = player1->getPhysicsBody()->getVelocity();
auto v2 = player2->getPhysicsBody()->getVelocity();
if (v1.x > MV || v1.x < -MV ||
v1.y > MV || v1.y < -MV) {
} else if(v1 != Vec2(0,0)) {
player1->getPhysicsBody()->setVelocity(Vec2(0,0));
CCLOG("sx 1 : %f %f",v1.x,v1.y);
}
if (v2.x > MV || v2.x < -MV ||
v2.y > MV || v2.y < -MV) {
} else if(v2 != Vec2(0,0)) {
player2->getPhysicsBody()->setVelocity(Vec2(0,0));
CCLOG("sx 2 : %f %f",v2.x,v2.y);
}
一切正常,除非球靠近墙或彼此相邻.我看到了这些物体上的蓝色小胶,这是建立联系的时间.
Everything works fine except when the balls stand next to the wall or each other. I see the small blue glue to these objects, this is when the contact has been made.
在这种情况下,我无法将速度设置为0,0. 我认为某种力量会不断改变速度.您可以看到下面的图片,看到蓝色的胶水,并像永远一样将速度设置为0.0.
And in these situation, i can't set the velocity to 0,0. I think there is some kind of force constantly changing the velocity. You can see the image below to see the blue glue and keep setting velocity = 0.0 like forever.
推荐答案
在将速度设置为零之前首先重置力:player2->getPhysicsBody()->resetForces();
Firstly reset forces before setting velocity to zero: player2->getPhysicsBody()->resetForces();
重力也可能是物体继续运动的原因. 因此,您可以将整个物理学世界的引力设置为零.例如:
Also gravity can be a cause that bodies continue to move. So you can set gravity to zero for whole physics world. For example:
auto scene = Scene::createWithPhysics();
scene->getPhysicsWorld()->setGravity(Vec2(0, 0));
或仅针对特定身体:
player2->getPhysicsBody()->setGravityEnable(false);
或者您可以自定义速度函数:
or you can customize velocity function:
#include "chipmunk.h"
cocos2d::PhysicsBody * pBody = player2->getPhysicsBody();
pBody->getCPBody()->velocity_func = customVelFunc;
其中customVelFunc
可以定义为:
void customVelFunc(cpBody *body, cpVect gravity, cpFloat damping, cpFloat dt)
{
cpBodyUpdateVelocity(body, cpvzero, damping, dt);
}
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