src/elements/wire.c


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#include <element.h>
 
int update_WIRE(UPDATE_FUNC_ARGS) {
    int s,r,rx,ry,count;    
    /*
    0:  wire
    1:  spark head
    2:  spark tail
    
    tmp is previous state, ctype is current state
    */
    //parts[i].tmp=parts[i].ctype;
    parts[i].ctype=0;
    if(parts[i].tmp==1)
	{
		parts[i].ctype=2;
	}
    if(parts[i].tmp==2)
	{
		parts[i].ctype=0;
	}
    
    count=0;
    for(rx=-1; rx<2; rx++)
        for(ry=-1; ry<2; ry++)
        {
            if(x+rx>=0 && y+ry>0 && x+rx<XRES && y+ry<YRES && (rx || ry))
            {
                r = pmap[y+ry][x+rx];
				if ((r>>8)>=NPART || !r)
					continue;
                if((r&0xFF)==PT_SPRK && parts[r>>8].ctype==PT_PSCN){parts[i].ctype=1; parts[r>>8].life=0; return 0;}
				else if((r&0xFF)==PT_NSCN && parts[i].tmp==1){create_part(-1, x+rx, y+ry, PT_SPRK);}
                else if((r&0xFF)==PT_WIRE && parts[r>>8].tmp==1 && !parts[i].tmp){count++;}
            }
        }
    if(count==1 || count==2)
        parts[i].ctype=1;
	return 0;
}