// scrolls the map one pixel left
bool CMap::scrollLeft(const bool force)
{
if( !force && findVerticalScrollBlocker((m_scrollx)<<STC) )
return false;
const int squareSize = gVideoDriver.getScrollSurface()->w;
if( m_scrollx > 32 )
{
m_scrollx--;
gVideoDriver.mpVideoEngine->UpdateScrollBufX(m_scrollx, squareSize-1);
if (m_scrollpix==0)
{ // need to draw a new stripe
if(m_mapx>0) m_mapx--;
if (m_mapxstripepos == 0)
{
m_mapxstripepos = (squareSize - 16);
}
else
{
m_mapxstripepos -= 16;
}
drawVstripe(m_mapxstripepos, m_mapx);
m_scrollpix = 15;
} else m_scrollpix--;
refreshVisibleArea();
return true;
}
return false;
}
// scrolls the map one pixel left
bool CMap::scrollLeft(const bool force)
{
if( m_scrollx > 32 )
{
m_scrollx--;
m_scrollx_buf = m_scrollx&511;
if (m_scrollpix==0)
{ // need to draw a new stripe
if(m_mapx>0) m_mapx--;
if (m_mapxstripepos == 0)
{
m_mapxstripepos = (512 - 16);
}
else
{
m_mapxstripepos -= 16;
}
drawVstripe(m_mapxstripepos, m_mapx);
m_scrollpix = 15;
} else m_scrollpix--;
}
return true;
}
// scrolls the map one pixel right
bool CMap::scrollRight(const bool force)
{
const int res_width = gVideoDriver.getGameResolution().w;
if( !force && findVerticalScrollBlocker((m_scrollx+res_width)<<STC) )
return false;
const int squareSize = gVideoDriver.getScrollSurface()->w;
if(m_scrollx < ((m_width-2)<<4) - res_width)
{
m_scrollx++;
gVideoDriver.mpVideoEngine->UpdateScrollBufX(m_scrollx, squareSize-1);
m_scrollpix++;
if (m_scrollpix >= 16)
{ // need to draw a new stripe
const int totalNumTiles = squareSize/16;
drawVstripe(m_mapxstripepos, m_mapx + totalNumTiles);
m_mapx++;
m_mapxstripepos += 16;
if (m_mapxstripepos >= squareSize) m_mapxstripepos = 0;
m_scrollpix = 0;
}
refreshVisibleArea();
return true;
}
return false;
}
// scrolls the map one pixel right
bool CMap::scrollRight(const bool force)
{
if(m_scrollx < ((m_width-2)<<4) - g_pVideoDriver->getGameResolution().w)
{
m_scrollx++;
m_scrollx_buf = m_scrollx&511;
m_scrollpix++;
if (m_scrollpix>=16)
{ // need to draw a new stripe
drawVstripe(m_mapxstripepos, m_mapx + 32);
m_mapx++;
m_mapxstripepos += 16;
if (m_mapxstripepos >= 512) m_mapxstripepos = 0;
m_scrollpix = 0;
}
}
return true;
}
