JDK8/Java8源码在线阅读
/*
* Copyright (c) 1995, 2008, Oracle and/or its affiliates. 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. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package java.awt;
import java.awt.geom.Point2D;
import java.beans.Transient;
/**
* A point representing a location in {@code (x,y)} coordinate space,
* specified in integer precision.
*
* @author Sami Shaio
* @since 1.0
*/
public class Point extends Point2D implements java.io.Serializable {
/**
* The X coordinate of this <code>Point</code>.
* If no X coordinate is set it will default to 0.
*
* @serial
* @see #getLocation()
* @see #move(int, int)
* @since 1.0
*/
public int x;
/**
* The Y coordinate of this <code>Point</code>.
* If no Y coordinate is set it will default to 0.
*
* @serial
* @see #getLocation()
* @see #move(int, int)
* @since 1.0
*/
public int y;
/*
* JDK 1.1 serialVersionUID
*/
private static final long serialVersionUID = -5276940640259749850L;
/**
* Constructs and initializes a point at the origin
* (0, 0) of the coordinate space.
* @since 1.1
*/
public Point() {
this(0, 0);
}
/**
* Constructs and initializes a point with the same location as
* the specified <code>Point</code> object.
* @param p a point
* @since 1.1
*/
public Point(Point p) {
this(p.x, p.y);
}
/**
* Constructs and initializes a point at the specified
* {@code (x,y)} location in the coordinate space.
* @param x the X coordinate of the newly constructed <code>Point</code>
* @param y the Y coordinate of the newly constructed <code>Point</code>
* @since 1.0
*/
public Point(int x, int y) {
this.x = x;
this.y = y;
}
/**
* {@inheritDoc}
* @since 1.2
*/
public double getX() {
return x;
}
/**
* {@inheritDoc}
* @since 1.2
*/
public double getY() {
return y;
}
/**
* Returns the location of this point.
* This method is included for completeness, to parallel the
* <code>getLocation</code> method of <code>Component</code>.
* @return a copy of this point, at the same location
* @see java.awt.Component#getLocation
* @see java.awt.Point#setLocation(java.awt.Point)
* @see java.awt.Point#setLocation(int, int)
* @since 1.1
*/
@Transient
public Point getLocation() {
return new Point(x, y);
}
/**
* Sets the location of the point to the specified location.
* This method is included for completeness, to parallel the
* <code>setLocation</code> method of <code>Component</code>.
* @param p a point, the new location for this point
* @see java.awt.Component#setLocation(java.awt.Point)
* @see java.awt.Point#getLocation
* @since 1.1
*/
public void setLocation(Point p) {
setLocation(p.x, p.y);
}
/**
* Changes the point to have the specified location.
* <p>
* This method is included for completeness, to parallel the
* <code>setLocation</code> method of <code>Component</code>.
* Its behavior is identical with <code>move(int, int)</code>.
* @param x the X coordinate of the new location
* @param y the Y coordinate of the new location
* @see java.awt.Component#setLocation(int, int)
* @see java.awt.Point#getLocation
* @see java.awt.Point#move(int, int)
* @since 1.1
*/
public void setLocation(int x, int y) {
move(x, y);
}
/**
* Sets the location of this point to the specified double coordinates.
* The double values will be rounded to integer values.
* Any number smaller than <code>Integer.MIN_VALUE</code>
* will be reset to <code>MIN_VALUE</code>, and any number
* larger than <code>Integer.MAX_VALUE</code> will be
* reset to <code>MAX_VALUE</code>.
*
* @param x the X coordinate of the new location
* @param y the Y coordinate of the new location
* @see #getLocation
*/
public void setLocation(double x, double y) {
this.x = (int) Math.floor(x+0.5);
this.y = (int) Math.floor(y+0.5);
}
/**
* Moves this point to the specified location in the
* {@code (x,y)} coordinate plane. This method
* is identical with <code>setLocation(int, int)</code>.
* @param x the X coordinate of the new location
* @param y the Y coordinate of the new location
* @see java.awt.Component#setLocation(int, int)
*/
public void move(int x, int y) {
this.x = x;
this.y = y;
}
/**
* Translates this point, at location {@code (x,y)},
* by {@code dx} along the {@code x} axis and {@code dy}
* along the {@code y} axis so that it now represents the point
* {@code (x+dx,y+dy)}.
*
* @param dx the distance to move this point
* along the X axis
* @param dy the distance to move this point
* along the Y axis
*/
public void translate(int dx, int dy) {
this.x += dx;
this.y += dy;
}
/**
* Determines whether or not two points are equal. Two instances of
* <code>Point2D</code> are equal if the values of their
* <code>x</code> and <code>y</code> member fields, representing
* their position in the coordinate space, are the same.
* @param obj an object to be compared with this <code>Point2D</code>
* @return <code>true</code> if the object to be compared is
* an instance of <code>Point2D</code> and has
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