tv.dyndns.kishibe.qmaclone.client.geom.Point.java Source code

Introduction

Here is the source code for tv.dyndns.kishibe.qmaclone.client.geom.Point.java

Source

//The MIT License
//
//Copyright (c) 2009 nodchip
//
//Permission is hereby granted, free of charge, to any person obtaining a copy
//of this software and associated documentation files (the "Software"), to deal
//in the Software without restriction, including without limitation the rights
//to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
//copies of the Software, and to permit persons to whom the Software is
//furnished to do so, subject to the following conditions:
//
//The above copyright notice and this permission notice shall be included in
//all copies or substantial portions of the Software.
//
//THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
//IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
//FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
//AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
//LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
//OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
//THE SOFTWARE.
package tv.dyndns.kishibe.qmaclone.client.geom;

import java.util.List;

import com.google.common.base.Objects;
import com.google.common.base.Strings;
import com.google.common.collect.Lists;

public class Point implements Cloneable {
    public static final int INVALID = -1;
    public final int x;
    public final int y;

    public Point(int x, int y) {
        this.x = x;
        this.y = y;
    }

    /**
     * ????????????null?
     * 
     * @param s
     *            
     * @return ????????{@code null}
     */
    public static Point fromString(String s) {
        if (Strings.isNullOrEmpty(s)) {
            return null;
        }

        List<Double> values = Lists.newArrayList();
        for (String value : s.split(" ")) {
            try {
                values.add(Double.valueOf(value));
            } catch (NumberFormatException e) {
                return null;
            }
        }

        if (values.size() != 2) {
            return null;
        }

        int xx = (int) Math.rint(values.get(0));
        int yy = (int) Math.rint(values.get(1));
        return new Point(xx, yy);
    }

    @Override
    public String toString() {
        return x + " " + y;
    }

    public Point minus(Point rh) {
        return new Point(x - rh.x, y - rh.y);
    }

    public int norm() {
        return x * x + y * y;
    }

    @Override
    public boolean equals(Object obj) {
        if (!(obj instanceof Point)) {
            return false;
        }
        Point rh = (Point) obj;
        return x == rh.x && y == rh.y;
    }

    @Override
    public int hashCode() {
        return Objects.hashCode(x, y);
    }

    public boolean isValid() {
        return !(x == INVALID || y == INVALID);
    }
}