// ----------------------------------------------------------------

// From Game Programming in C++ by Sanjay Madhav

// Copyright (C) 2017 Sanjay Madhav. All rights reserved.

//

// Released under the BSD License

// See LICENSE in root directory for full details.

// ----------------------------------------------------------------

#pragma once

#include "CameraComponent.h"

class FollowCamera : public CameraComponent

{

public:

FollowCamera(class Actor* owner);

void Update(float deltaTime) override;

void SnapToIdeal();

void SetHorzDist(float dist) { mHorzDist = dist; }

void SetVertDist(float dist) { mVertDist = dist; }

void SetTargetDist(float dist) { mTargetDist = dist; }

void SetSpringConstant(float spring) { mSpringConstant = spring; }

TypeID GetType() const override { return TFollowCamera; }

void LoadProperties(const rapidjson::Value& inObj) override;

void SaveProperties(rapidjson::Document::AllocatorType& alloc,

rapidjson::Value& inObj) const override;

private:

Vector3 ComputeCameraPos() const;

// Actual position of camera

Vector3 mActualPos;

// Velocity of actual camera

Vector3 mVelocity;

// Horizontal follow distance

float mHorzDist;

// Vertical follow distance

float mVertDist;

// Target distance

float mTargetDist;

// Spring constant (higher is more stiff)

float mSpringConstant;

};