How to drag and throw a physics body in the direction of swipe?

cocos2d-x C++
1

My question is same as in the title. I’m making a board game with dice. I want to drag and throw (fling) the dice in the direction user swipes and speed must be according to the user’s swipe speed. I’m using cocos2d-x 3.8 c++, default physics; chipmunk. Any help from you guys will be much appreciated.

2

Don’t have much idea about Chipmunk, but the below fragment should get you started. Sorry for the clumsy code though (am at office :grimacing: ):

// HelloWorld.h
float swipeTime;		// Delta Time
float swipeDistance;

// HelloWorld.cpp
HelloWorld::init(){
	swipeTime = -1;
	swipeDistance = 0;
	this->scheduleUpdate();
}

HelloWorld::update(float dt){
	if(swipeTime > -1){	// Starts counting frames since touch
		swipeTime++;	// Increments by 1 for every frame (which is 0.0167 seconds @ 60 fps)
	}
}

HelloWorld::onTouchesStart(touches, event){
	swipeTime = 0;
}

HelloWorld::onTouchesEnded(touches, event){
	swipeDistance	 = touch[0]->getLocationInView()->distance(touch[0]->getStartLocationInView());
	float swipeAngle = touch[0]->getLocationInView()->getAngle(touch[0]->getStartLocationInView());
	float swipeSpeed = swipeDistance/(swipeTime * 0.0167f);
	swipeTime = -1;
}