Method RayCast

DynamicsB2World.go:977–1003

(callback B2RaycastCallback, point1 B2Vec2, point2 B2Vec2)

}

func (world *B2World) RayCast(callback B2RaycastCallback, point1 B2Vec2, point2 B2Vec2) {

	// B2TreeRayCastCallback
	wrapper := func(input B2RayCastInput, nodeId int) float64 {

		userData := world.M_contactManager.M_broadPhase.GetUserData(nodeId)
		proxy := userData.(*B2FixtureProxy)
		fixture := proxy.Fixture
		index := proxy.ChildIndex
		output := MakeB2RayCastOutput()
		hit := fixture.RayCast(&output, input, index)

		if hit {
			fraction := output.Fraction
			point := B2Vec2Add(B2Vec2MulScalar((1.0-fraction), input.P1), B2Vec2MulScalar(fraction, input.P2))
			return callback(fixture, point, output.Normal, fraction)
		}

		return input.MaxFraction
	}

	input := MakeB2RayCastInput()
	input.MaxFraction = 1.0
	input.P1 = point1
	input.P2 = point2
	world.M_contactManager.M_broadPhase.RayCast(wrapper, input)
}

// void (world *B2World) DrawShape(b2Fixture* fixture, const b2Transform& xf, const b2Color& color)
// {