// vector.cpp

// includes

#include "piece.h"
#include "square.h"
#include "util.h"
#include "vector.h"

// variables

int Distance[DeltaNb];

// functions

void vector_init()
    {
    int delta;
    int x, y;
    int dist, tmp;

    // Distance[]

    for ( delta = 0; delta < DeltaNb; delta++ )
        Distance[delta] = -1;

    for ( y = -7; y <= +7; y++ )
        {
        for ( x = -7; x <= +7; x++ )
            {

            delta = y * 16 + x;
            ASSERT(delta_is_ok(delta));

            dist = 0;

            tmp = x;

            if( tmp < 0 )
                tmp = -tmp;

            if( tmp > dist )
                dist = tmp;

            tmp = y;

            if( tmp < 0 )
                tmp = -tmp;

            if( tmp > dist )
                dist = tmp;

            Distance[DeltaOffset + delta] = dist;
            }
        }
    }

// delta_is_ok()

bool delta_is_ok( int delta )
    {
    if( delta < -119 || delta > +119 )
        return false;

    if( (delta & 0xF) == 8 )
        return false;

    return true;
    }

// inc_is_ok()

bool inc_is_ok( int inc )
    {

    int dir;

    for ( dir = 0; dir < 8; dir++ )
        {
        if( KingInc[dir] == inc )
            return true;
        }

    return false;
    }

// end of vector.cpp
