Java Vector vectorDir(int vert, int horiz)

Description

vector Dir

License

Open Source License

Declaration

public static int vectorDir(int vert, int horiz) 

Method Source Code

//package com.java2s;
//it under the terms of the GNU Affero General Public License as published by

public class Main {
    private static final int VERTICAL_COMPONENT[] = { 0, 1, 1, 0, 5, 5, 5, 0, 1 };
    private static final int HORIZONTAL_COMPONENT[] = { 0, 0, 3, 3, 3, 0, 7, 7, 7 };
    /** Lookup table with combined v/h directions using {@code h+v%3} as index. */
    private static final int VECTOR_LOOKUP[] = { 0, 1, 5, 3, 2, 4, -1, 7, 8, 6 };

    public static int vectorDir(int vert, int horiz) {
        int v = verticalDir(vert);
        int h = horizontalDir(horiz);
        if (vert != v && horiz != h) {
            throw new IllegalArgumentException("Invalid directions");
        }/*  www.  j  av  a 2s . c  om*/
        return VECTOR_LOOKUP[h + v % 3];
    }

    /**
     * Extracts the vertical component of the direction
     * @return NORTH, SOUTH or CENTER
     */
    public static int verticalDir(int direction) {
        checkDirection(direction);
        return VERTICAL_COMPONENT[direction];
    }

    /**
     * Extracts the horizontal component of the direction.
     * @return WEST, EAST or CENTER.
     */
    public static int horizontalDir(int direction) {
        checkDirection(direction);
        return HORIZONTAL_COMPONENT[direction];
    }

    private static void checkDirection(int direction) {
        if (direction < 0 || direction > 8) {
            throw new IllegalArgumentException("Argument (" + direction + ") must be a Swing direction constant");
        }
    }
}

Related

1. vector_norm(double[] vec)
2. vector_sum(double[] v, double[] w)
3. vectorAbsoluteValue(double X, double Y, double Z)
4. vectorCos(int[] d1, int[] d2)
5. vectorDiff(final double[] vecOne, final double[] vecTwo)
6. vectorDistance(double[] vec1, double[] vec2, double power)
7. vectorIndexToUpperTriangularIndices(int numberOfRows, int index)
8. vectorKLDivergence(double v1[], double v2[])
9. vectorL2Norm(double[] v)