139 lines
3.6 KiB
C++
139 lines
3.6 KiB
C++
/***************************************************************************
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alienBlaster
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Copyright (C) 2004
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Paul Grathwohl, Arne Hormann, Daniel Kuehn, Soenke Schwardt
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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***************************************************************************/
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#include "background.h"
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#include "global.h"
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#include "surfaceDB.h"
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#include "SDL.h"
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#include <iostream>
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using namespace std;
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Background::Background() {
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minTileWidth = 9999999;
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minTileHeight = 9999999;
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tilesPerLine = 0;
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tilesPerColumn = 0;
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step = 0;
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}
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void Background::clearTileList() {
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tileNames.clear();
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tilesPerLine = 0;
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tilesPerColumn = 0;
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}
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void Background::addTile( string tilename ) {
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tileNames.push_back( tilename );
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}
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void Background::generateBackground( int length ) {
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tileSurfaces.clear();
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minTileWidth = 9999999;
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minTileHeight = 9999999;
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// load all tiles
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vector< SdlCompat_AcceleratedSurface* > tmpTiles;
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for(int i=tileNames.size()-1; i>=0; i--) {
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SdlCompat_AcceleratedSurface *tile = surfaceDB.loadSurface( tileNames[i] );
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if (tile != NULL) {
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tmpTiles.push_back( tile );
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if (tile->w < minTileWidth) {
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minTileWidth = tile->w;
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}
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if (tile->h < minTileHeight) {
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minTileHeight = tile->h;
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}
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}
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}
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// calculate tiles per line and tiles per row
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tilesPerLine = SCREEN_WIDTH / minTileWidth;
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if (SCREEN_WIDTH % minTileWidth) {
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tilesPerLine++;
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}
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tilesPerColumn = SCREEN_HEIGHT / minTileHeight;
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if (SCREEN_HEIGHT % minTileHeight) {
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tilesPerColumn++;
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}
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int rows = length / minTileHeight;
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if (length % minTileHeight) {
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rows++;
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}
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// cout << "Background: minTileWidth=" << minTileWidth << " minTileHeight=" << minTileHeight << " rows=" << rows << endl;
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// generate random background
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for(int i=rows*tilesPerLine; i; i--) {
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tileSurfaces.push_back( tmpTiles[ rand() % tmpTiles.size() ] );
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}
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}
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void Background::draw( SdlCompat_AcceleratedSurface* screen ) {
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step = (step+1) % (tilesPerColumn*minTileHeight);
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draw( screen, step );
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}
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void Background::draw( SdlCompat_AcceleratedSurface* screen, int step ) {
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if (step < 0) {
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step *= -1;
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}
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int startLine = (step / minTileHeight);
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int offset = (step % minTileHeight);
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SDL_Rect srcRect;
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srcRect.x = 0;
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srcRect.y = 0;
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SDL_Rect dstRect;
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for(int y = 0; y < tilesPerColumn+1; y++) {
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for(int x = 0; x < tilesPerLine; x++) {
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int diffX = SCREEN_WIDTH - x * minTileWidth;
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if ( diffX >= minTileWidth ) {
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srcRect.w = minTileWidth;
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} else {
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srcRect.w = diffX;
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}
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dstRect.w = srcRect.w;
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if (y==0) {
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int diffY = -(offset - minTileHeight);
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srcRect.h = diffY;
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} else {
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srcRect.h = minTileHeight;
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}
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dstRect.h = srcRect.h;
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dstRect.x = x * minTileWidth;
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dstRect.y = SCREEN_HEIGHT + offset - (y+1) * minTileHeight;
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SDL_BlitSurface( tileSurfaces[ ((y+startLine)*tilesPerLine+x) % tileSurfaces.size()] , &srcRect, screen, &dstRect );
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}
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}
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}
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