Please Help "collision chipmunk"

cocos2d-x C++
1

i have a box how do collision with sides left and right sprite give (game over)
and on the top no

i have this code
sorry my english
bool PlayScene::onCollisionBegin(PhysicsContact &contact){

auto shapeA = contact.getShapeA();
auto nodeA = shapeA->getBody()->getNode();

auto shapeB = contact.getShapeB();
auto nodeB = shapeB->getBody()->getNode();


  if ((nodeA->getTag() == TagOfSprite::ROCK_SPRITE && nodeB->getTag() == TagOfSprite::RUNNER_SPRITE)
           || (nodeB->getTag() == TagOfSprite::ROCK_SPRITE && nodeA->getTag() == TagOfSprite::RUNNER_SPRITE))

       {

           log("==game over");
       }

return true;

}

where find tutorials on how use chipmunk in cocos2d-x 3.x and examples in cocos2d-x 3.x

2

Your code seems alright, what exactly is the problem?

Check out the Programmer’s Guide and the cpp-tests

@SonarSystems has good video tutorials on pretty much everything cocos2d-x.

3

I guess your collision filters are not properly set.

Have you at least debugged it and see if the code reach the OnCollisionBegin code?

I think there are chipmunk samples in the cpp_tests

4

how to do this, collision in chipmunk…
please code in c++

fa8ef8e865609306.png1354×531

5

I’m not sure how it will work but I guess you’ll have to check the angle of the collision normal?

I’ve not worked with physics so I can’t say. Maybe someone more experienced with physics can help out.

6

yea friend

7

I looked up the API and I guess it will be something like this -

auto normal = contact.getContactData()->normal;

This will give you a vec2.
Then you can use -

auto angle = normal->getAngle();

Which will give you the angle (in radians) with respect to the X axis as a float.
You can then check the angle to see if it hit from the side or from the top.

I hope that helps :slight_smile: