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Background.cpp
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Background.cpp
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/***************************************************************************
Background.cpp - description
-------------------
begin : Sun Jan 11 2004
copyright : (C) 2004 by upi
email : upi@feel
***************************************************************************/
#include "Background.h"
#include "SDL.h"
#include "sge_surface.h"
#include "gfx.h"
#include "common.h"
#include <string>
#include <fstream>
Background::Background()
{
m_bOK = false;
m_iNumber = 0;
}
Background::~Background()
{
Clear();
}
void Background::Clear()
{
for( LayerIterator it=m_aLayers.begin(); it!=m_aLayers.end(); ++it )
{
BackgroundLayer& roLayer = *it;
if ( roLayer.m_poSurface )
{
SDL_FreeSurface( roLayer.m_poSurface );
roLayer.m_poSurface = NULL;
}
}
m_aLayers.clear();
m_bOK = false;
m_iNumber = 0;
}
void Background::Load( int a_iBackgroundNumber )
{
char acFilename[FILENAME_MAX+1];
// 1. Try loading a description-based background.
sprintf( acFilename, "%s/gfx/level%d.desc", DATADIR, a_iBackgroundNumber );
std::ifstream oInput( acFilename );
if ( !oInput.is_open() )
{
// Description-based background not found. Try simple image-based
// background.
sprintf( acFilename, "level%d.png", a_iBackgroundNumber );
SDL_Surface* poImage = LoadBackground( acFilename, 64 );
if ( NULL == poImage )
{
// Couldn't load background.
return;
}
BackgroundLayer oLayer;
oLayer.m_poSurface = poImage;
oLayer.m_iXOffset = 0;
oLayer.m_iYOffset = 0;
oLayer.m_dDistance = 1.0;
m_aLayers.push_back( oLayer );
m_iNumber = a_iBackgroundNumber;
m_bOK = true;
return;
}
// 2. Parse description.
int iNumLayers;
oInput >> iNumLayers;
for ( int i=0; i<iNumLayers; ++i )
{
BackgroundLayer oLayer;
std::string sFilename;
oInput >> sFilename >> oLayer.m_iXOffset >> oLayer.m_iYOffset >> oLayer.m_dDistance;
oLayer.m_poSurface = LoadBackground( sFilename.c_str(), 64, 0 );
if ( NULL == oLayer.m_poSurface )
{
continue;
}
m_aLayers.push_back( oLayer );
}
m_bOK = m_aLayers.size() > 0;
m_iNumber = m_bOK ? a_iBackgroundNumber : 0;
}
bool Background::IsOK()
{
return m_bOK;
}
void Background::Draw( int a_iXPosition, int a_iYPosition )
{
for ( LayerIterator it = m_aLayers.begin(); it != m_aLayers.end(); ++it )
{
BackgroundLayer& roLayer = *it;
sge_Blit( roLayer.m_poSurface, gamescreen,
0, 0, // source position
roLayer.m_iXOffset - (int)( ((double)a_iXPosition) * roLayer.m_dDistance ),
roLayer.m_iYOffset - (int)( ((double)a_iYPosition) * roLayer.m_dDistance ),
SCREENWIDTH*3 + 100, SCREENHEIGHT + 100 );
}
}

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