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/*
* The Mana World
* Copyright 2004 The Mana World Development Team
*
* This file is part of The Mana World.
*
* The Mana World is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* any later version.
*
* The Mana World is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with The Mana World; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* $Id$
*/
#include "ambientoverlay.h"
#include "image.h"
#include "../graphics.h"
AmbientOverlay::AmbientOverlay(Image *img, float parallax,
float scrollX, float scrollY, float speedX, float speedY):
mImage(img), mParallax(parallax),
mScrollX(scrollX), mScrollY(scrollY),
mSpeedX(speedX), mSpeedY(speedY)
{
mImage->incRef();
}
AmbientOverlay::~AmbientOverlay()
{
mImage->decRef();
}
void AmbientOverlay::update(int timePassed, float dx, float dy)
{
// Self scrolling of the overlay
mScrollX -= mSpeedX * timePassed / 10;
mScrollY -= mSpeedY * timePassed / 10;
// Parallax scrolling
mScrollX += dx * mParallax;
mScrollY += dy * mParallax;
int imgW = mImage->getWidth();
int imgH = mImage->getHeight();
// Wrap values
while (mScrollX > imgW)
mScrollX -= imgW;
while (mScrollX < 0)
mScrollX += imgW;
while (mScrollY > imgH)
mScrollY -= imgH;
while (mScrollY < 0)
mScrollY += imgH;
}
void AmbientOverlay::draw(Graphics *graphics, int x, int y)
{
graphics->drawImagePattern(mImage, (int)(-mScrollX), (int)(-mScrollY),
x + (int)mScrollX, y + (int)mScrollY);
}
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