Linear Interpolator C++ class for graphics programming

Interpolator.cpp

#include "Interpolator.h"


bool Interpolator::Set(float aStartValue, float aEndValue, float aDuration)
{
	bool isValidArgs = true;
	startValue = aStartValue;
	endValue = aEndValue;
	if (aDuration <= 0) {
		duration = 0;
		isValidArgs = false;
	}
	else {
		duration = aDuration;
	}
	deltaValue = endValue - startValue;
	elapsedTime = 0;
	currentValue = startValue;
	return isValidArgs;
}

float Interpolator::Update(float deltaTime)
{
	elapsedTime += deltaTime;
	if (elapsedTime >= duration) {
		elapsedTime = duration;
		currentValue = endValue;
		return endValue;
	}
	currentValue = 
		startValue
		+ deltaValue * (elapsedTime / duration);
	return currentValue;
}

float Interpolator::GetCurrentValue() const
{
	return currentValue;
}

bool Interpolator::IsEndValueReached() const
{
	return (elapsedTime >= duration);
}

void Interpolator::Reset()
{
	elapsedTime = 0;
	currentValue = startValue;
}

Interpolator.h

#ifndef _INTERPOLATOR_H_
#define _INTERPOLATOR_H_

class Interpolator
{
private:
	float startValue;
	float endValue;
	float deltaValue;
	float duration;
	float elapsedTime;
	float currentValue;
public:
	bool Set(float aStartValue, float aEndValue, float aDuration);
	float Update(float deltaTime);
	float GetCurrentValue() const;
	bool IsEndValueReached() const;
	void Reset();
};

#endif