The Mana World: tmw/src/imageparticle.cpp Source File

00001 /*
00002  *  The Mana World
00003  *  Copyright (C) 2006  The Mana World Development Team
00004  *
00005  *  This file is part of The Mana World.
00006  *
00007  *  This program is free software; you can redistribute it and/or modify
00008  *  it under the terms of the GNU General Public License as published by
00009  *  the Free Software Foundation; either version 2 of the License, or
00010  *  any later version.
00011  *
00012  *  This program is distributed in the hope that it will be useful,
00013  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00015  *  GNU General Public License for more details.
00016  *
00017  *  You should have received a copy of the GNU General Public License
00018  *  along with this program; if not, write to the Free Software
00019  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
00020  */
00021 
00022 #include "imageparticle.h"
00023 
00024 #include "graphics.h"
00025 
00026 #include "resources/image.h"
00027 
00028 ImageParticle::ImageParticle(Map *map, Image *image):
00029     Particle(map),
00030     mImage(image)
00031 {
00032     if (mImage)
00033         mImage->incRef();
00034 }
00035 
00036 ImageParticle::~ImageParticle()
00037 {
00038     if (mImage)
00039         mImage->decRef();
00040 }
00041 
00042 void ImageParticle::draw(Graphics *graphics, int offsetX, int offsetY) const
00043 {
00044     if (!mAlive)
00045         return;
00046 
00047     int screenX = (int) mPos.x + offsetX - mImage->getWidth() / 2;
00048     int screenY = (int) mPos.y - (int)mPos.z + offsetY - mImage->getHeight()/2;
00049 
00050     // Check if on screen
00051     if (screenX + mImage->getWidth() < 0 ||
00052             screenX > graphics->getWidth() ||
00053             screenY + mImage->getHeight() < 0 ||
00054             screenY > graphics->getHeight())
00055     {
00056         return;
00057     }
00058 
00059     float alphafactor = mAlpha;
00060 
00061     if (mLifetimeLeft > -1 && mLifetimeLeft < mFadeOut)
00062         alphafactor *= (float) mLifetimeLeft / (float) mFadeOut;
00063 
00064     if (mLifetimePast < mFadeIn)
00065         alphafactor *= (float) mLifetimePast / (float) mFadeIn;
00066 
00067     mImage->setAlpha(alphafactor);
00068     graphics->drawImage(mImage, screenX, screenY);
00069 }