/*
 * $RCSfile$
 *
 * Copyright 2005-2008 Sun Microsystems, Inc.  All Rights Reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Sun designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Sun in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
 * CA 95054 USA or visit www.sun.com if you need additional information or
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 *
 * $Revision$
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 * $State$
 */

package javax.vecmath;

import java.lang.Math;

/**
 * A 2-element tuple represented by signed integer x,y
 * coordinates.
 *
 * @since vecmath 1.4
 */
public abstract class Tuple2i implements java.io.Serializable, Cloneable {

    static final long serialVersionUID = -3555701650170169638L;

    /**
     * The x coordinate.
     */
    public int x;

    /**
     * The y coordinate.
     */
    public int y;


    /**
     * Constructs and initializes a Tuple2i from the specified
     * x and y coordinates.
     * @param x the x coordinate
     * @param y the y coordinate
     */
    public Tuple2i(int x, int y) {
	this.x = x;
	this.y = y;
    }


    /**
     * Constructs and initializes a Tuple2i from the array of length 2.
     * @param t the array of length 2 containing x and y in order.
     */
    public Tuple2i(int[] t) {
	this.x = t[0];
	this.y = t[1];
    }


    /**
     * Constructs and initializes a Tuple2i from the specified Tuple2i.
     * @param t1 the Tuple2i containing the initialization x and y
     * data.
     */
    public Tuple2i(Tuple2i t1) {
	this.x = t1.x;
	this.y = t1.y;
    }


    /**
     * Constructs and initializes a Tuple2i to (0,0).
     */
    public Tuple2i() {
	this.x = 0;
	this.y = 0;
    }


    /**
     * Sets the value of this tuple to the specified x and y
     * coordinates.
     * @param x the x coordinate
     * @param y the y coordinate
     */
    public final void set(int x, int y) {
	this.x = x;
	this.y = y;
    }


    /**
     * Sets the value of this tuple to the specified coordinates in the
     * array of length 2.
     * @param t the array of length 2 containing x and y in order.
     */
    public final void set(int[] t) {
	this.x = t[0];
	this.y = t[1];
    }


    /**
     * Sets the value of this tuple to the value of tuple t1.
     * @param t1 the tuple to be copied
     */
    public final void set(Tuple2i t1) {
	this.x = t1.x;
	this.y = t1.y;
    }


    /**
     * Copies the values of this tuple into the array t.
     * @param t is the array
     */
    public final void get(int[] t) {
	t[0] = this.x;
	t[1] = this.y;
    }


    /**
     * Copies the values of this tuple into the tuple t.
     * @param t is the target tuple
     */
    public final void get(Tuple2i t) {
	t.x = this.x;
	t.y = this.y;
    }


    /**
     * Sets the value of this tuple to the sum of tuples t1 and t2.
     * @param t1 the first tuple
     * @param t2 the second tuple
     */
    public final void add(Tuple2i t1, Tuple2i t2) {
	this.x = t1.x + t2.x;
	this.y = t1.y + t2.y;
    }


    /**
     * Sets the value of this tuple to the sum of itself and t1.
     * @param t1 the other tuple
     */
    public final void add(Tuple2i t1) {
	this.x += t1.x;
	this.y += t1.y;
    }


    /**
     * Sets the value of this tuple to the difference
     * of tuples t1 and t2 (this = t1 - t2).
     * @param t1 the first tuple
     * @param t2 the second tuple
     */
    public final void sub(Tuple2i t1, Tuple2i t2) {
	this.x = t1.x - t2.x;
	this.y = t1.y - t2.y;
    }


    /**
     * Sets the value of this tuple to the difference
     * of itself and t1 (this = this - t1).
     * @param t1 the other tuple
     */
    public final void sub(Tuple2i t1) {
	this.x -= t1.x;
	this.y -= t1.y;
    }


    /**
     * Sets the value of this tuple to the negation of tuple t1.
     * @param t1 the source tuple
     */
    public final void negate(Tuple2i t1) {
	this.x = -t1.x;
	this.y = -t1.y;
    }


    /**
     * Negates the value of this tuple in place.
     */
    public final void negate() {
	this.x = -this.x;
	this.y = -this.y;
    }


    /**
     * Sets the value of this tuple to the scalar multiplication
     * of tuple t1.
     * @param s the scalar value
     * @param t1 the source tuple
     */
    public final void scale(int s, Tuple2i t1) {
	this.x = s*t1.x;
	this.y = s*t1.y;
    }


    /**
     * Sets the value of this tuple to the scalar multiplication
     * of the scale factor with this.
     * @param s the scalar value
     */
    public final void scale(int s) {
	this.x *= s;
	this.y *= s;
    }


    /**
     * Sets the value of this tuple to the scalar multiplication
     * of tuple t1 plus tuple t2 (this = s*t1 + t2).
     * @param s the scalar value
     * @param t1 the tuple to be multipled
     * @param t2 the tuple to be added
     */
    public final void scaleAdd(int s, Tuple2i t1, Tuple2i t2) {
	this.x = s*t1.x + t2.x;
	this.y = s*t1.y + t2.y;
    }


    /**
     * Sets the value of this tuple to the scalar multiplication
     * of itself and then adds tuple t1 (this = s*this + t1).
     * @param s the scalar value
     * @param t1 the tuple to be added
     */
    public final void scaleAdd(int s, Tuple2i t1) {
        this.x = s*this.x + t1.x;
        this.y = s*this.y + t1.y;
    }


    /**
     * Returns a string that contains the values of this Tuple2i.
     * The form is (x,y).
     * @return the String representation
     */
    public String toString() {
        return "(" + this.x + ", " + this.y + ")";
    }


    /**
     * Returns true if the Object t1 is of type Tuple2i and all of the
     * data members of t1 are equal to the corresponding data members in
     * this Tuple2i.
     * @param t1  the object with which the comparison is made
     */
    public boolean equals(Object t1) {
        try {
	    Tuple2i t2 = (Tuple2i) t1;
	    return(this.x == t2.x && this.y == t2.y);
        }
        catch (NullPointerException e2) {
	    return false;
	}
        catch (ClassCastException e1) {
	    return false;
	}
    }


    /**
     * Returns a hash code value based on the data values in this
     * object.  Two different Tuple2i objects with identical data values
     * (i.e., Tuple2i.equals returns true) will return the same hash
     * code value.  Two objects with different data members may return the
     * same hash value, although this is not likely.
     * @return the integer hash code value
     */
    public int hashCode() {
	long bits = 1L;
	bits = 31L * bits + (long)x;
	bits = 31L * bits + (long)y;
	return (int) (bits ^ (bits >> 32));
    }


    /**
     *  Clamps the tuple parameter to the range [low, high] and
     *  places the values into this tuple.
     *  @param min   the lowest value in the tuple after clamping
     *  @param max  the highest value in the tuple after clamping
     *  @param t   the source tuple, which will not be modified
     */
    public final void clamp(int min, int max, Tuple2i t) {
        if( t.x > max ) {
	    x = max;
        } else if( t.x < min ) {
	    x = min;
        } else {
	    x = t.x;
        }

        if( t.y > max ) {
	    y = max;
        } else if( t.y < min ) {
	    y = min;
        } else {
	    y = t.y;
        }
    }


    /**
     *  Clamps the minimum value of the tuple parameter to the min
     *  parameter and places the values into this tuple.
     *  @param min   the lowest value in the tuple after clamping
     *  @param t   the source tuple, which will not be modified
     */
    public final void clampMin(int min, Tuple2i t) {
        if( t.x < min ) {
	    x = min;
        } else {
	    x = t.x;
        }

        if( t.y < min ) {
	    y = min;
        } else {
	    y = t.y;
        }
    }


    /**
     *  Clamps the maximum value of the tuple parameter to the max
     *  parameter and places the values into this tuple.
     *  @param max   the highest value in the tuple after clamping
     *  @param t   the source tuple, which will not be modified
     */
    public final void clampMax(int max, Tuple2i t) {
        if( t.x > max ) {
	    x = max;
        } else {
	    x = t.x;
        }

        if( t.y > max ) {
	    y = max;
        } else {
	    y = t.y;
        }
    }


    /**
     *  Sets each component of the tuple parameter to its absolute
     *  value and places the modified values into this tuple.
     *  @param t   the source tuple, which will not be modified
     */
    public final void absolute(Tuple2i t) {
	x = Math.abs(t.x);
	y = Math.abs(t.y);
    }


    /**
     *  Clamps this tuple to the range [low, high].
     *  @param min  the lowest value in this tuple after clamping
     *  @param max  the highest value in this tuple after clamping
     */
    public final void clamp(int min, int max) {
	if( x > max ) {
	    x = max;
        } else if( x < min ) {
	    x = min;
        }

        if( y > max ) {
	    y = max;
        } else if( y < min ) {
	    y = min;
        }
    }


    /**
     *  Clamps the minimum value of this tuple to the min parameter.
     *  @param min   the lowest value in this tuple after clamping
     */
    public final void clampMin(int min) {
	if (x < min)
	    x=min;

	if (y < min)
	    y = min;
    }


    /**
     *  Clamps the maximum value of this tuple to the max parameter.
     *  @param max   the highest value in the tuple after clamping
     */
    public final void clampMax(int max) {
	if (x > max)
	    x = max;

	if (y > max)
	    y = max;
    }


    /**
     *  Sets each component of this tuple to its absolute value.
     */
    public final void absolute() {
	x = Math.abs(x);
	y = Math.abs(y);
    }

    /**
     * Creates a new object of the same class as this object.
     *
     * @return a clone of this instance.
     * @exception OutOfMemoryError if there is not enough memory.
     * @see java.lang.Cloneable
     */
    public Object clone() {
	// Since there are no arrays we can just use Object.clone()
	try {
	    return super.clone();
	} catch (CloneNotSupportedException e) {
	    // this shouldn't happen, since we are Cloneable
	    throw new InternalError();
	}
    }


    /**
	 * Get the <i>x</i> coordinate.
	 * 
	 * @return the x coordinate.
	 * 
	 * @since vecmath 1.5
	 */
	public final int getX() {
		return x;
	}


	/**
	 * Set the <i>x</i> coordinate.
	 * 
	 * @param x  value to <i>x</i> coordinate.
	 * 
	 * @since vecmath 1.5
	 */
	public final void setX(int x) {
		this.x = x;
	}


	/**
	 * Get the <i>y</i> coordinate.
	 * 
	 * @return  the <i>y</i> coordinate.
	 * 
	 * @since vecmath 1.5
	 */
	public final int getY() {
		return y;
	}


	/**
	 * Set the <i>y</i> coordinate.
	 * 
	 * @param y value to <i>y</i> coordinate.
	 * 
	 * @since vecmath 1.5
	 */
	public final void setY(int y) {
		this.y = y;
	}
}