diff options
Diffstat (limited to 'kscreensaver/kdesavers/firesaverwriter.cpp')
| -rw-r--r-- | kscreensaver/kdesavers/firesaverwriter.cpp | 247 |
1 files changed, 247 insertions, 0 deletions
diff --git a/kscreensaver/kdesavers/firesaverwriter.cpp b/kscreensaver/kdesavers/firesaverwriter.cpp new file mode 100644 index 00000000..07209884 --- /dev/null +++ b/kscreensaver/kdesavers/firesaverwriter.cpp @@ -0,0 +1,247 @@ +/*************************************************************************** + * Copyright (C) 2004 by E.Ros * + * rosenric@dei.unipd.it * + * * + * This program 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 * + * (at your option) any later version. * + * * + ***************************************************************************/ + +#include <math.h> +#include <stdlib.h> +#include <qimage.h> +#include <qgl.h> +#include <qfile.h> +#include <qstring.h> +#include <kdebug.h> +#include <kstandarddirs.h> +#include <kdeversion.h> +#include <klocale.h> +#include "firesaverwriter.h" + + +/* Word: SINGLE WORD */ + +Word::Word( const char * _text, QMap<char, Symbol *> * sMap, float _scale ) + : width(0), scale(_scale), cX(0), cY(0), vScale(0), vX(0), vY(0), + activateTime(0.0), lifeTime(2), currentTime(0) +{ + for ( ; *_text != 0 && *_text != ' '; _text++ ) + { + char c = *_text; + if ( !sMap->contains(c) ) //search for a symbol in the map + continue; + Symbol * symbol = (*sMap)[c]; //get the symbol* + width += symbol->scale; //increase word's half-width + symbolList.append( symbol ); //insert it to the list + } + color[0] = 0; + color[1] = 0.8 * drand48(); + color[2] = 0.2 + 0.8 * drand48(); + color[3] = 1; +} + +inline void Word::renderWord( double dT ) +{ + if ( (currentTime += dT) < activateTime ) + return; + + //update coloring + if ( activateTime >= 0 ) { + if ( currentTime < activateTime + 0.4 ) + color[3] = (currentTime - activateTime) / 0.4; + else + color[3] = 1 - (currentTime - activateTime - 0.4) / (lifeTime - 0.4); + } else + color[3] = 1 - currentTime / lifeTime; + + //word's global transforms + glPushMatrix(); + glTranslatef( cX - scale * width, cY, 0 ); + glScalef( scale, scale, 1 ); + glColor4fv( color ); + + //for each symbol draw it! + Symbol * symbol = symbolList.first(); + for( ; symbol; symbol = symbolList.next() ) + symbol->renderSymbol(); + glPopMatrix(); + + //physical update to position and scale + cX += vX * dT; + cY += vY * dT; + scale += scale * vScale * dT; +} + +inline bool Word::isDead() +{ + if ( activateTime > 0 ) + return (currentTime - activateTime) >= lifeTime; + return currentTime >= lifeTime; +} + + + +/* Writer: engine that spawns and manages words */ + +Writer::Writer( QString descFileName ) + : numTextures(0) +{ + wordList.setAutoDelete( true ); + + if ( !loadMap( descFileName ) ) + return; + + QString welcomeString = i18n("Welcome to KDE %1.%2.%3") + .arg(KDE_VERSION_MAJOR) + .arg(KDE_VERSION_MINOR) + .arg(KDE_VERSION_RELEASE); + spawnWords(welcomeString, Fun1); +} + +Writer::~ Writer() +{ + glDeleteTextures( numTextures, texArray ); + wordList.clear(); + QMap<char, Symbol *>::Iterator it = symbolMap.begin(); + for ( ; it != symbolMap.end(); ++it ) + delete (Symbol *)it.data(); +} + +void Writer::spawnWords( QString phrase, effectType fX ) +{ + int wordCount = 0; + float xCenter = 0, + yCenter = drand48()*40 - 20, + wordsWidth = 0; + QPtrList<Word> localWords; + while ( phrase.length() > 0 ) + { + QString letters = phrase.section(" ",0,0); + Word * word = new Word( letters.latin1(), &symbolMap ); + wordList.append( word ); + localWords.append( word ); + word->cX = xCenter; + word->cY = yCenter; + switch ( fX ) { + case Fun1:{ + float angle = 2*M_PI * drand48(), + module = 0.25 * (drand48() + drand48()); + word->vX = module * cos( angle ); + word->vY = module * sin( angle ); + word->vScale = 0.6; + word->scale = 0.7 + 0.3*(drand48() + drand48());} + word->activateTime = 0.3 * wordCount; + //fall to the case below for word spacing + default: + case NoEffect: + wordsWidth += word->width; + word->cX += wordsWidth; + wordsWidth += word->width + 1; + break; + case Sequence: + word->lifeTime = 1.2; + word->activateTime = 0.6 + 0.9 * wordCount; +// word->vY = -5; + break; + } + wordCount ++; + phrase.remove(0, letters.length() + 1); + } + if ( localWords.count() < 1 ) + return; + //some computations to 'center' the string + float displace = -(wordsWidth - 1) / 2; + Word * word = localWords.first(); + for( ; word; word = localWords.next() ) + word->cX += displace; +} + +void Writer::render( double dT ) +{ + if ( !numTextures ) + return; + + glEnable( GL_TEXTURE_2D ); + + glPushMatrix(); + glScalef( 0.6, 0.6, 1.0 ); + Word * word = wordList.first(); + while( word ) { + word->renderWord( dT ); + if ( word->isDead() ) { + wordList.remove(); + word = wordList.current(); + } else + word = wordList.next(); + } + glPopMatrix(); +} + +/* loadMap() + * parses the description file to create the internal symbols map. + * This map is then used when building words. + **/ +bool Writer::loadMap( QString descFile ) +{ + QFile desc( locate("data","kfiresaver/"+descFile) ); + if ( !desc.open( IO_ReadOnly ) ) + return false; + + unsigned int currentNumber; + float xres = 0, yres = 0; + bool generatedFirst = false; + + while ( !desc.atEnd() ) + { + QString line; + int count = desc.readLine( line, 100 ); + //skip comments / invalid lines + if ( count < 6 || line.at(0) == '#') + continue; + //load texture maps + if ( line.at(0) == '"' && numTextures < 15 ) + { + //load and generate texture + QString fileName = line.section("\"", 1,1 ); + QImage tmp; + if ( !tmp.load( locate("data","kfiresaver/"+fileName) ) ) { + kdWarning() << "can't load filename:" << fileName << endl; + generatedFirst = false; + continue; + } + glGenTextures( 1, ¤tNumber ); + texArray[ numTextures++ ] = currentNumber; + glBindTexture(GL_TEXTURE_2D, currentNumber); + glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR ); + glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR ); + QImage texture = QGLWidget::convertToGLFormat( tmp ); + xres = (float)texture.width(); + yres = (float)texture.height(); + glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, (int)xres, (int)yres, 0, + GL_RGBA, GL_UNSIGNED_BYTE, texture.bits()); + generatedFirst = true; + continue; + } + if ( !generatedFirst ) + continue; + if ( line.contains(' ') != 4 ) { + kdWarning() << "wrong line on symbols.desc (4 spaces expected):" << endl; + kdWarning() << " '" << line << "'" << endl; + continue; + } + //parse the line describing a symbol and create it + char p = *(line.latin1()); + if ( symbolMap.contains(p) ) + continue; + float left = (float)(line.section(" ",1,1).toInt())/xres, + top = (float)(line.section(" ",2,2).toInt())/yres, + right = (float)(line.section(" ",3,3).toInt() + 1)/xres, + bottom = (float)(line.section(" ",4,4).toInt() + 1)/yres; + symbolMap[p] = new Symbol( currentNumber, left,top,right,bottom ); + } + + return symbolMap.size() > 0; +} |