Java中使用java.awt.geom.Point2D进行坐标相关的计算(距离、平方等)

太过爱你忘了你带给我的痛 2023-09-30 14:39 2阅读 0赞

## 场景 ##

在Java中需要对坐标点进行一些计算和判断。

比如计算两点之间的距离、距离的平方、两点是否相等、坐标赋值、克隆等。

可以使用Java自带的java.awt.Point2D的相关API。

API文档：

[Point2D (Java Platform SE 8 )][Point2D _Java Platform SE 8]

常用方法

<table> 
 <tbody> 
 <tr> 
 <th>变量和类型</th> 
 <th>方法</th> 
 <th>描述</th> 
 </tr> 
 <tr> 
 <td><code><a href="https://nowjava.com/docs/java-api-11/java.base/java/lang/Object.html" title="Object" rel="nofollow">Object</a></code></td> 
 <th><code><a href="https://nowjava.com/docs/java-api-11/java.desktop/java/awt/geom/Point2D.html#clone%28%29" title="clone" rel="nofollow">clone</a>()</code></th> 
 <td> 创建与此对象具有相同类并具有相同内容的新对象。 </td> 
 </tr> 
 <tr> 
 <td><code>double</code></td> 
 <th><code><a href="https://nowjava.com/docs/java-api-11/java.desktop/java/awt/geom/Point2D.html#distance%28double,double%29" title="distance" rel="nofollow">distance</a>(double&nbsp;px, double&nbsp;py)</code></th> 
 <td> 返回此&nbsp;<code>Point2D</code>到指定点的距离。 </td> 
 </tr> 
 <tr> 
 <td><code>static double</code></td> 
 <th><code><a href="https://nowjava.com/docs/java-api-11/java.desktop/java/awt/geom/Point2D.html#distance%28double,double,double,double%29" title="distance" rel="nofollow">distance</a>(double&nbsp;x1, double&nbsp;y1, double&nbsp;x2, double&nbsp;y2)</code></th> 
 <td> 返回两点之间的距离。 </td> 
 </tr> 
 <tr> 
 <td><code>double</code></td> 
 <th><code><a href="https://nowjava.com/docs/java-api-11/java.desktop/java/awt/geom/Point2D.html#distance%28java.awt.geom.Point2D%29" title="distance" rel="nofollow">distance</a>(<a href="https://nowjava.com/docs/java-api-11/java.desktop/java/awt/geom/Point2D.html" title="Point2D" rel="nofollow">Point2D</a>&nbsp;pt)</code></th> 
 <td> 返回此&nbsp;<code>Point2D</code>到指定的&nbsp;<code>Point2D</code>的距离。 </td> 
 </tr> 
 <tr> 
 <td><code>double</code></td> 
 <th><code><a href="https://nowjava.com/docs/java-api-11/java.desktop/java/awt/geom/Point2D.html#distanceSq%28double,double%29" title="distanceSq" rel="nofollow">distanceSq</a>(double&nbsp;px, double&nbsp;py)</code></th> 
 <td> 返回从此&nbsp;<code>Point2D</code>到指定点的距离的平方。 </td> 
 </tr> 
 <tr> 
 <td><code>static double</code></td> 
 <th><code><a href="https://nowjava.com/docs/java-api-11/java.desktop/java/awt/geom/Point2D.html#distanceSq%28double,double,double,double%29" title="distanceSq" rel="nofollow">distanceSq</a>(double&nbsp;x1, double&nbsp;y1, double&nbsp;x2, double&nbsp;y2)</code></th> 
 <td> 返回两点之间距离的平方。 </td> 
 </tr> 
 <tr> 
 <td><code>double</code></td> 
 <th><code><a href="https://nowjava.com/docs/java-api-11/java.desktop/java/awt/geom/Point2D.html#distanceSq%28java.awt.geom.Point2D%29" title="distanceSq" rel="nofollow">distanceSq</a>(<a href="https://nowjava.com/docs/java-api-11/java.desktop/java/awt/geom/Point2D.html" title="Point2D" rel="nofollow">Point2D</a>&nbsp;pt)</code></th> 
 <td> 返回从此&nbsp;<code>Point2D</code>到指定的&nbsp;<code>Point2D</code>的距离的平方。 </td> 
 </tr> 
 <tr> 
 <td><code>boolean</code></td> 
 <th><code><a href="https://nowjava.com/docs/java-api-11/java.desktop/java/awt/geom/Point2D.html#equals%28java.lang.Object%29" title="equals" rel="nofollow">equals</a>(<a href="https://nowjava.com/docs/java-api-11/java.base/java/lang/Object.html" title="Object" rel="nofollow">Object</a>&nbsp;obj)</code></th> 
 <td> 确定两个点是否相等。 </td> 
 </tr> 
 <tr> 
 <td><code>abstract double</code></td> 
 <th><code><a href="https://nowjava.com/docs/java-api-11/java.desktop/java/awt/geom/Point2D.html#getX%28%29" title="getX" rel="nofollow">getX</a>()</code></th> 
 <td> 以&nbsp;<code>double</code>精度返回此&nbsp;<code>Point2D</code>的X坐标。 </td> 
 </tr> 
 <tr> 
 <td><code>abstract double</code></td> 
 <th><code><a href="https://nowjava.com/docs/java-api-11/java.desktop/java/awt/geom/Point2D.html#getY%28%29" title="getY" rel="nofollow">getY</a>()</code></th> 
 <td> 以&nbsp;<code>double</code>精度返回此&nbsp;<code>Point2D</code>的Y坐标。 </td> 
 </tr> 
 <tr> 
 <td><code>int</code></td> 
 <th><code><a href="https://nowjava.com/docs/java-api-11/java.desktop/java/awt/geom/Point2D.html#hashCode%28%29" title="hashCode" rel="nofollow">hashCode</a>()</code></th> 
 <td> 返回此&nbsp;<code>Point2D</code>的哈希&nbsp;<code>Point2D</code>&nbsp;。 </td> 
 </tr> 
 <tr> 
 <td><code>abstract void</code></td> 
 <th><code><a href="https://nowjava.com/docs/java-api-11/java.desktop/java/awt/geom/Point2D.html#setLocation%28double,double%29" title="setLocation" rel="nofollow">setLocation</a>(double&nbsp;x, double&nbsp;y)</code></th> 
 <td> 将此&nbsp;<code>Point2D</code>的位置设置为指定的&nbsp;<code>double</code>坐标。 </td> 
 </tr> 
 <tr> 
 <td><code>void</code></td> 
 <th><code><a href="https://nowjava.com/docs/java-api-11/java.desktop/java/awt/geom/Point2D.html#setLocation%28java.awt.geom.Point2D%29" title="setLocation" rel="nofollow">setLocation</a>(<a href="https://nowjava.com/docs/java-api-11/java.desktop/java/awt/geom/Point2D.html" title="Point2D" rel="nofollow">Point2D</a>&nbsp;p)</code></th> 
 <td> 将此&nbsp;<code>Point2D</code>的位置设置为与指定的&nbsp;<code>Point2D</code>对象相同的坐标。 </td> 
 </tr> 
 </tbody> 
</table>

注：

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## 实现 ##

1、坐标对象声明赋值

Point2D.Double point1 = new Point2D.Double(200.22555d,546545.454455d);
            Point2D.Double point2 = new Point2D.Double(25656.22555d,151545.4556748d);

2、计算两点之间的距离

//计算两点之间的距离
            Point2D.Double point1 = new Point2D.Double(200.22555d,546545.454455d);
            Point2D.Double point2 = new Point2D.Double(25656.22555d,151545.4556748d);
            //System.out.println("两点之间的距离"+point1.distance(point2));

3、分别获取x和y

System.out.println("获取x和y"+point1.getX()+" "+point1.getY());

4、两点之间距离的平方

System.out.println("两点之间距离的平方"+point1.distanceSq(point2));

5、两点是否相等

System.out.println("两点是否相等"+point1.equals(point2));

6、返回哈希Point2D

System.out.println("返回此 Point2D的哈希Point2D"+point1.hashCode());

7、设置为指定的坐标

//point1.setLocation(point2);
            //System.out.println("将此 Point2D的位置设置为与指定的 Point2D对象相同的坐标"+point1);

8、克隆

Point2D.Double point3 = (Point2D.Double) point1.clone();
            System.out.println(point3);

[Point2D _Java Platform SE 8]: https://docs.oracle.com/javase/8/docs/api/java/awt/geom/Point2D.html
[CSDN_-C_SpringBoot]: https://blog.csdn.net/badao_liumang_qizhi