screen_vertical_scroll.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
 *
 * 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
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 *----------------------------------------------------------------------------
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 * (la "Licenza"); è proibito usare questo file se non in conformità alla
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/****************************************************************************
 * INCLUDE SECTION 
 ****************************************************************************/
 
#include "../../ugbc.h"
 
/****************************************************************************
 * CODE SECTION 
 ****************************************************************************/

/* <usermanual>
@keyword SCREEN VERTICAL SCROLL
</usermanual> */
void screen_vertical_scroll( Environment * _environment, int _displacement ) {
 
    
 
    char displacementString[MAX_TEMPORARY_STORAGE]; sprintf( displacementString, "#$%2.2x", ( _displacement - 4 ) > 0 ? ( _displacement - 4 ) : ( 4 - _displacement ) );
 
    gtia_vertical_scroll( _environment, displacementString );
 
}

/* <usermanual>
@keyword SCREEN VERTICAL SCROLL
</usermanual> */
void screen_vertical_scroll_var( Environment * _environment, char * _displacement ) {
 
    Variable * displacement = variable_retrieve( _environment, _displacement );
 
    gtia_vertical_scroll( _environment, displacement->realName );
 
}