tween.hpp

#pragma once

#include <glm/glm.hpp>

template<typename T>
class Tween {
	public:
		Tween(float speed = 1.0)
		: _value(T()),
		  _target(T()),
		  _speed(speed) {
		}

		const T & getValue() const {
			return _value;
		}

		float getDistance() const {
			return glm::distance(_value, _target);
		}

		void reset(T value) {
			_value = value;
			_target = value;
		}

		void setTarget(T target) {
			_target = target;
		}

		void update(float delta) {
			const float amount = glm::clamp(delta * _speed, 0.0f, 0.5f);
			_value = glm::mix(_value, _target, amount);
		}

	private:
		T _value;
		T _target;
		float _speed;
};