tile_belong.c

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/*****************************************************************************
 * ugBASIC - an isomorphic BASIC language compiler for retrocomputers        *
 *****************************************************************************
 * Copyright 2021-2026 Marco Spedaletti (asimov@mclink.it)
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/****************************************************************************
 * INCLUDE SECTION 
 ****************************************************************************/
 
#include "../../ugbc.h"
#include "../../libs/stb_image.h"
 
/****************************************************************************
 * CODE SECTION 
 ****************************************************************************/

/* <usermanual>
@keyword TILE BELONG TO
 
@english
The ''TILE ... BELONG TO ... '' command allows you to check if a certain ''TILE'' belongs 
to the set of tiles that make up a TILES. In general, ''TILES'' are made up of multiple 
simple tiles and, when drawn, actually occupy multiple tiles. This command allows you to 
make distinctions.
 
@italian
Il comando ''TILE ... BELONG TO ...'' permette di verificare se un determinato ''TILE'' 
appartiene all'insieme dei tiles che compongono un ''TILES''. In generale, i ''TILES''
sono formati da più tile semplici e, quando vengono disegnati, occupano effettivamente 
più tile. Questo comando consente di effettuare distinzioni.
 
@syntax = TILE tile BELONG TO tiles
 
@example = TILE tile BELONG TO multitiles
 
@target all
</usermanual> */
Variable * tile_belong( Environment * _environment, char * _tile, char * _tiles ) {
 
    MAKE_LABEL
 
    outhead1("%sbelong:", label );
 
    Variable * tile = variable_retrieve_or_define( _environment, _tile, VT_TILE, 0 );
    Variable * tiles = variable_retrieve_or_define( _environment, _tiles, VT_TILES, 0 );
 
    Variable * curTile = variable_temporary( _environment, VT_BYTE, "(tile)" ); 
    cpu_move_8bit( _environment, tile->realName, curTile->realName );
 
    Variable * minTile = variable_cast( _environment, tile_get_first( _environment, _tiles )->name, VT_WORD ); 
    Variable * tileWidth = tile_get_width( _environment, _tiles ); 
    Variable * tileHeight = tile_get_height( _environment, _tiles ); 
    Variable * maxTile = variable_mul( _environment, tileWidth->name, tileHeight->name ); 
 
    variable_add_inplace_vars( _environment, maxTile->name, minTile->name );
 
    return variable_and( _environment, 
                            variable_greater_than( _environment, curTile->name, minTile->name, 1 )->name,
                            variable_less_than( _environment, curTile->name, maxTile->name, 1 )->name
                            );       
 
}