施加脉冲时身体不稳定运动(Cocos2d-Box2d)

发布于 2024-10-04 04:12:23 字数 533 浏览 4 评论 0原文

基本上我试图以特定的角度对圆形物体施加脉冲。但身体却朝着不稳定的方向移动。任何人都可以帮助我吗？

b2Vec2 v1 = bombbody->GetPosition();
b2Vec2 v2 = arrowPoint;//Value got from touch
b2Vec2 final = v2-v1;
float angle1 = CC_RADIANS_TO_DEGREES(atan2(final.y,final.x));
float factor = sqrt(final.x/PTM_RATIO * final.x/PTM_RATIO + final.y/PTM_RATIO * final.y/PTM_RATIO);
b2Vec2 ImpulseVector = b2Vec2(cos(angle1)*factor,sin(angle1)*factor);
b2Vec2 PointVector = bombbody->GetPosition();
bombbody->ApplyLinearImpulse(ImpulseVector,PointVector);

原文

Basically i am trying to apply impulse to a round body in a specific angle.
But the body moves in a erratic direction.
Can anyone please help me.

b2Vec2 v1 = bombbody->GetPosition();
b2Vec2 v2 = arrowPoint;//Value got from touch
b2Vec2 final = v2-v1;
float angle1 = CC_RADIANS_TO_DEGREES(atan2(final.y,final.x));
float factor = sqrt(final.x/PTM_RATIO * final.x/PTM_RATIO + final.y/PTM_RATIO * final.y/PTM_RATIO);
b2Vec2 ImpulseVector = b2Vec2(cos(angle1)*factor,sin(angle1)*factor);
b2Vec2 PointVector = bombbody->GetPosition();
bombbody->ApplyLinearImpulse(ImpulseVector,PointVector);

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梦年海沫深 2024-10-11 04:12:23

您应该使用 b2Body::GetWorldCenter 作为 b2Body::ApplyLinearImpulse 的第二个参数：

  b2Vec2 PointVector = bombbody->GetWorldCenter();
  bombbody->ApplyLinearImpulse(ImpulseVector,PointVector);

根据在 Box2D 论坛上发帖，GetPosition 不能与强制一起使用的原因是强制起作用与身体的质心，它可能并不总是与其位置相同。

You should use b2Body::GetWorldCenter for the second parameter of b2Body::ApplyLinearImpulse:

  b2Vec2 PointVector = bombbody->GetWorldCenter();
  bombbody->ApplyLinearImpulse(ImpulseVector,PointVector);

According to a post at Box2D forum, the reason why GetPosition doesn't work with force is that the force works with the body's center of mass, which might not always be the same as its position.

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