upw.c

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/*****************************************************************************
 * ugBASIC - an isomorphic BASIC language compiler for retrocomputers        *
 *****************************************************************************
 * Copyright 2021-2026 Marco Spedaletti (asimov@mclink.it)
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
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 * http://www.apache.org/licenses/LICENSE-2.0
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 * See the License for the specific language governing permissions and
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/****************************************************************************
 * INCLUDE SECTION 
 ****************************************************************************/
 
#include "../../ugbc.h"
 
/****************************************************************************
 * CODE SECTION 
 ****************************************************************************/

/* <usermanual>
@keyword UPW
 
@english
 
''UPW'' allows the programmer to scroll up a section of the text screen from ''x,y''
with the ''width'' and the ''height'', including the colors, line by line. The new 
lines inserted are filled in the bottom line with the correspondent character
that exit from the top.
 
Note that this command uses console #3 to store the current console values, in order to 
restore them after scrolling. So it cannot be used by the program.
 
@italian
 
''UPW'' consente al programmatore di scorrere verso l'alto una sezione dello schermo 
di testo da ''x,y'' con la ''width'' e l''height'', inclusi i colori, riga per riga. 
Le nuove righe inserite vengono riempite nella riga inferiore con il carattere che
esce dal bordo inferiore.
 
Da notare che questo comando utilizza la console nr. 3 per stoccare i valori della 
console attuale, al fine di ripristinarli al termine dello scorrimento. Quindi non 
può essere utilizzata dal programma.
 
@syntax UPW y, x, width, height
 
@example UPW 1, 1, 10, 10
 
@seeAlso UPB
 
@target all
</usermanual> */
void upw( Environment * _environment, char * _line, char * _column, char * _width, char * _height ) {
 
    Variable * column = variable_retrieve_or_define( _environment, _column, VT_BYTE, 0 );
    Variable * line = variable_retrieve_or_define( _environment, _line, VT_BYTE, 0 );
    Variable * width = variable_retrieve_or_define( _environment, _width, VT_BYTE, _environment->screenTilesWidth );
    Variable * height = variable_retrieve_or_define( _environment, _height, VT_BYTE, _environment->screenTilesHeight  );
 
    Variable * x2 = variable_add( _environment, column->name, width->name );
    Variable * y2 = variable_add( _environment, line->name, height->name );
 
    variable_decrement( _environment, x2->name );
    variable_decrement( _environment, y2->name );
    
    int previous = _environment->activeConsole.id;
    console_save( _environment, 3 );
    console_vars( _environment, _column, _line, x2->name, y2->name );
    text_vscroll_screen( _environment, -1, 1 );
    console_restore( _environment, previous );
 
 
}