Star.cpp

#include "Star.h"

bool Star::sScroll = false;

void Star::Scroll(bool b)
{
	sScroll = b;
}

Star::Star(int layer)
	: Texture("stars.png", 0,0,4,4)
{
	mTimer = Timer::Instance();
	int starColor = rand() % 4;
	mClipRect.x = starColor * 4;
	Pos(Vector2(rand() % Graphics::Instance()->SCREEN_WIDTH, rand() % Graphics::Instance()->SCREEN_HEIGHT));
	
	mFlickerTimer = 0.0f;
	mFlickerSpeed = 0.15f + ((float)rand() / RAND_MAX) * 0.45f;

	float invLayer = 1.0f / layer;
	Scale(VEC2_ONE * invLayer);

	mScrollSpeed = 4.0f / layer;
}

Star::~Star()
{
	mTimer = NULL;
}

void Star::ScrollStar()
{
	Translate(VEC2_UP * mScrollSpeed, world);
	Vector2 pos = Pos(local);
	if (pos.y > Graphics::Instance()->SCREEN_HEIGHT)
	{
		pos.y = 0.0f;
		pos.x = rand() % Graphics::Instance()->SCREEN_WIDTH;
		Pos(pos);
	}
}

void Star::Update()
{
	mFlickerTimer += mTimer->DeltaTime();
	if (mFlickerTimer >= mFlickerSpeed)
	{
		mVisible = !mVisible;
		mFlickerTimer = 0.0f;
	}
	if (sScroll)
	{
		ScrollStar();
	}
}

void Star::Render()
{
	if (mVisible)
	{
		Texture::Render();
	}
}