jmove.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.
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/****************************************************************************
 * INCLUDE SECTION 
 ****************************************************************************/
 
 #include "../../ugbc.h"
 
 /****************************************************************************
  * CODE SECTION 
  ****************************************************************************/
 
 /* <usermanual>
 @keyword JMOVE
 
 @english
 
 The ''JMOVE'' command allows you to update two variables (abscissa and ordinate) 
 according to the detected position of the joystick. In addition to indicating the 
 variables that will be updated, it is possible to indicate the minimum and maximum 
 movement limits. If the variables are already beyond the limits, no updates will 
 be made. Note that, to support a range that starts from zero (0), you need to use 
 a signed data type to represent the coordinates.
 
 @italian
 
Il comando JMOVE permette di aggiornare due variabili (ascissa e ordinata) secondo 
la posizione rilevata del joystick. Oltre ad indicare le variabili che saranno 
oggetto di aggiornamento, è possibile indicare i limiti minimo e massimo di 
movimento. Se le variabili sono già oltre i limiti, non saranno effettuati 
aggiornamenti. Si noti che, per supportare un intervallo che parte da zero (0), è 
necessario utilizzare un tipo di dati con segno per rappresentare le coordinate.
 
@syntax JMOVE [port,]x,y,minx,maxx,miny,maxy[,stepx,stepy]
@syntax JMOVE [port,]x,y,min,max
 
@example JMOVE 0, playerX, playerY, 0, 10, 0, 42
 
@target all
</usermanual> */
 
void jmove( Environment * _environment, char * _port, char * _x, char * _y, char * _minx, char * _maxx, char * _miny, char *_maxy, char * _xstep, char * _ystep  ) {
 
    MAKE_LABEL
 
    Variable * x = variable_retrieve( _environment, _x );
    Variable * y = variable_retrieve( _environment, _y );
 
    Variable * xstep = NULL;
    if ( _xstep ) {
        xstep = variable_retrieve( _environment, _xstep );
    } else {
        xstep = variable_temporary( _environment, VT_BYTE, "(xstep)" );
        variable_store( _environment, xstep->name, 1 );
    }
 
    Variable * ystep = NULL;
    if ( _ystep ) {
        ystep = variable_retrieve( _environment, _ystep );
    } else {
        ystep = variable_temporary( _environment, VT_BYTE, "(ystep)" );
        variable_store( _environment, ystep->name, 1 );
    }
 
    Variable * result = variable_temporary( _environment, VT_SBYTE, "(compare)" );
    
    Variable * joymove = joydir_semivars( _environment, _port );
 
    char detectedLabel[MAX_TEMPORARY_STORAGE]; sprintf(detectedLabel, "%sdetected", label );
    char detectedDownLabel[MAX_TEMPORARY_STORAGE]; sprintf(detectedDownLabel, "%sdetecteddown", label );
    char detectedLeftLabel[MAX_TEMPORARY_STORAGE]; sprintf(detectedLeftLabel, "%sdetectedleft", label );
    char detectedRightLabel[MAX_TEMPORARY_STORAGE]; sprintf(detectedRightLabel, "%sdetectedright", label );
 
    variable_compare_and_branch_const( _environment, joymove->name, 2, detectedDownLabel, 0 );
    add_complex_vars( _environment, y->name, ystep->name, _miny, _maxy, 1 );    
    cpu_jump( _environment, detectedLabel );
 
    cpu_label( _environment, detectedDownLabel );
    variable_compare_and_branch_const( _environment, joymove->name, 1, detectedLeftLabel, 0 );
    add_complex_vars( _environment, y->name, variable_complement_const( _environment, ystep->name, 0 )->name, _miny, _maxy, 1 );    
    cpu_jump( _environment, detectedLabel );
 
    cpu_label( _environment, detectedLeftLabel );
    variable_compare_and_branch_const( _environment, joymove->name, 8,  detectedRightLabel, 0 );
    add_complex_vars( _environment, x->name, xstep->name, _minx, _maxx, 1 );    
    cpu_jump( _environment, detectedLabel );
 
    cpu_label( _environment, detectedRightLabel );
    variable_compare_and_branch_const( _environment, joymove->name, 4,  detectedLabel, 0 );
    add_complex_vars( _environment, x->name,  variable_complement_const( _environment, xstep->name, 0 )->name, _minx, _maxx, 1 );    
 
    cpu_label( _environment, detectedLabel );
 
}