CircleComponent.cpp

#include "CircleComponent.h"
#include "Actor.h"

CircleComponent::CircleComponent(class Actor* owner)
	:Component(owner)
	, mRadius(0.0f)
{

}

const Vector2& CircleComponent::GetCenter() const
{
	return mOwner->GetPosition();
}

float CircleComponent::GetRadius() const
{
	return mOwner->GetScale() * mRadius;
}

// REFERENCE: p 62 Game Programming in C++ Sanjay Madhav
// Circle-Versus-Circle Intersection
// Two circles intersect with each other if and only if the distance between their centers is less than or equal to the sum of their radii.

bool Intersect(const CircleComponent& a, const CircleComponent& b)
{
	// Calculate distance squared
	Vector2 diff = a.GetCenter() - b.GetCenter();
	float distSq = diff.LengthSq();

	// Calculate sum of radii squared
	float radiiSq = a.GetRadius() + b.GetRadius();
	radiiSq *= radiiSq;

	return distSq <= radiiSq;
}

ASDF