screen_vertical_scroll.c

Go to the documentation of this file.

/*****************************************************************************
 * 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
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *----------------------------------------------------------------------------
 * Concesso in licenza secondo i termini della Licenza Apache, versione 2.0
 * (la "Licenza"); è proibito usare questo file se non in conformità alla
 * Licenza. Una copia della Licenza è disponibile all'indirizzo:
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Se non richiesto dalla legislazione vigente o concordato per iscritto,
 * il software distribuito nei termini della Licenza è distribuito
 * "COSÌ COM'È", SENZA GARANZIE O CONDIZIONI DI ALCUN TIPO, esplicite o
 * implicite. Consultare la Licenza per il testo specifico che regola le
 * autorizzazioni e le limitazioni previste dalla medesima.
 ****************************************************************************/
 
/****************************************************************************
 * INCLUDE SECTION 
 ****************************************************************************/
 
#include "../../ugbc.h"
 
/****************************************************************************
 * CODE SECTION 
 ****************************************************************************/

/* <usermanual>
@keyword SCREEN VERTICAL SCROLL
 
@english
Performs an hardware scroll of the screen. The scroll is always in 
the direction from bottom to up, so with a displacement of 0 the 
screen is exactly as it would be without scrolling while with the 
value 7 you would have a scroll of 7 pixels upwards.
 
@italian
Esegue uno scorrimento hardware dello schermo. Lo scorrimento è sempre
dal basso verso l'alto, quindi con uno spostamento di 0 lo schermo è 
esattamente come sarebbe senza scrolling, mentre con il valore 7 
si avrebbe uno scroll di 7 pixel verso l'alto.
 
@syntax SCREEN VERTICAL SCROLL [integer]
 
@example SCREEN VERTICAL SCROLL 3
 
@target c64
</usermanual> */
void screen_vertical_scroll( Environment * _environment, int _displacement ) {
 
    
 
    char displacementString[MAX_TEMPORARY_STORAGE]; sprintf( displacementString, "#$%2.2x", _displacement );
 
    vic2_vertical_scroll( _environment, displacementString );
 
}

/* <usermanual>
@keyword SCREEN VERTICAL SCROLL
 
@syntax SCREEN VERTICAL SCROLL [expression]
 
@example SCREEN VERTICAL SCROLL newScrolling
</usermanual> */
void screen_vertical_scroll_var( Environment * _environment, char * _displacement ) {
 
    
 
    Variable * displacement = variable_retrieve( _environment, _displacement );
 
    vic2_vertical_scroll( _environment, displacement->realName );
 
}