kscreensaver/kdesavers/firesaverwriter.h

   1 /***************************************************************************
   2  *   Copyright (C) 2004 by E.Ros                                           *
   3  *   rosenric@dei.unipd.it                                                 *
   4  *                                                                         *
   5  *   This program is free software; you can redistribute it and/or modify  *
   6  *   it under the terms of the GNU General Public License as published by  *
   7  *   the Free Software Foundation; either version 2 of the License, or     *
   8  *   (at your option) any later version.                                   *
   9  *                                                                         *
  10  ***************************************************************************/
  11
  12 #ifndef FIRESAVER_WRITER_H
  13 #define FIRESAVER_WRITER_H
  14
  15 #include <qgl.h>
  16 #include <q3ptrlist.h>
  17 #include <qmap.h>
  18 #include <qstring.h>
  19
  20 class Symbol
  21 {
  22     public:
  23         Symbol( unsigned int textureNumber, float l, float t, float r, float b )
  24             : scale((r - l) / (b - t)), texNum(textureNumber), L(l), T(1-t), R(r), B(1-b)
  25         {
  26             v1[0] = -scale;     v1[1] =  1;
  27             v2[0] = -scale;     v2[1] = -1;
  28             v3[0] = scale;      v3[1] =  1;
  29             v4[0] = scale;      v4[1] = -1;
  30         }
  31
  32         float scale;
  33
  34         inline void renderSymbol()
  35         {
  36             //draw the symbol and update "cursor"'s position
  37             glBindTexture( GL_TEXTURE_2D, texNum );
  38             glTranslatef( scale, 0, 0 );
  39             glBegin( GL_TRIANGLE_STRIP );
  40              glTexCoord2f( L, T );
  41              glVertex2fv( v1 );
  42              glTexCoord2f( L, B );
  43              glVertex2fv( v2 );
  44              glTexCoord2f( R, T );
  45              glVertex2fv( v3 );
  46              glTexCoord2f( R, B );
  47              glVertex2fv( v4 );
  48             glEnd();
  49             glTranslatef( scale, 0, 0 );
  50         }
  51
  52     private:
  53         float v1[2], v2[2], v3[2], v4[2];
  54         unsigned int texNum;    //number of texture to activate
  55         float L, T, R, B;       //coordinates for mapping
  56 };
  57
  58
  59 class Word
  60 {
  61     friend class Writer;
  62     public:
  63         Word( const char * text, QMap<char, Symbol *> * map, float scale = 1.0 );
  64
  65         inline void renderWord( double dT );
  66         inline bool isDead();
  67
  68     private:
  69         float width, scale, cX, cY;
  70         float vScale, vX, vY;
  71         float activateTime, lifeTime, currentTime;
  72         float color[4];
  73         Q3PtrList<Symbol> symbolList;
  74 };
  75
  76
  77 /*
  78  *
  79  **/
  80 class Writer
  81 {
  82     public:
  83         Writer( QString descFileName );
  84         ~Writer();
  85
  86         //types of effects implemented
  87         enum effectType { NoEffect = 0, Sequence, Fun1, Fun2 };
  88
  89         //call this function to add a sentence to the renderer
  90         void spawnWords( QString phrase, effectType fx = NoEffect );
  91
  92         //called to get the words on screen using OpenGL
  93         //Note: the context must be set up. Words are drawn on XY plane
  94         //inside a rectangle with 10 units's side.
  95         void render( double dT );
  96
  97     private:
  98         //misc utility functions
  99         bool loadMap( QString );
 100
 101         //texture 'references' used by GL to delete allocated textures
 102         int numTextures;
 103         unsigned int texArray[16];
 104
 105         //list of words and map of symbols
 106         Q3PtrList<Word> wordList;
 107         QMap<char, Symbol *> symbolMap;
 108
 109         //disables standard constructor
 110         Writer();
 111 };
 112
 113 #endif