JavaFX | Point2D 类
Point2D 类是 JavaFX 的一部分。这个类定义了空间中的一个二维点。点 2D 类通过它的 x，y 坐标来表示 2D 点。它继承了 java.lang.Object 类。 本班建造师:
- 点 2D(双 x，双 y) :用指定的 x 和 y 坐标创建点 2D 对象。
常用方法:
| 方法 | 说明 | | --- | --- | | 距离(双 x1，双 y1) | 计算该点和点(x1，y1)之间的距离。 | | 距离(点 2D p) | 计算该点和点 p 之间的距离。 | | 等于(java.lang.Object obj) | 返回该对象是否等于指定对象 | | getX（） | 返回点的 x 坐标 | | 盖蒂（） | 返回点的 y 坐标 | | hashCode() | 返回该点的哈希代码值。 |以下程序将说明 Point2D 类的使用:
1.Java 程序创建一个点 2D 对象并显示其坐标并找到其与原点的距离:在该程序中，我们使用其 x，y 坐标作为参数创建了一个名为 point2d_1 的 point 2D 对象。我们将使用 getX() 、 getY() 函数获得 x、y 的值，然后显示它。我们也在计算这些点离原点的距离。
Java 语言(一种计算机语言，尤用于创建网站)
// Java program to create a point 2D
// object and display its coordinates
// and find its distance from origin
import javafx.geometry.Point2D;
public class Point2D_1 {
// Main Method
public static void main(String args[])
{
// Create a point2D object
Point2D point2d_1 = new Point2D(20.0f, 150.0f);
double x, y;
// get the coordinates of the point
x = point2d_1.getX();
y = point2d_1.getY();
// display the coordinates of the point
System.out.println("x coordinate = " + x
+ ", y coordinate = " + y);
// print its distance from origin
System.out.println("distance from origin = "
+ point2d_1.distance(0, 0));
}
}
输出:
x coordinate = 20.0, y coordinate = 150.0
distance from origin = 151.32745950421557
2.Java 程序创建 3 个 Point2D 对象，并显示它们的坐标和与原点的距离，并检查这 3 个点中的哪一个相似以及它们在两个点之间的距离:在该程序中，我们通过传递其 x，y 坐标作为参数来创建名为 point2d_1 、 point2d_2 、 point2d_3 的 3 个 Point2D 对象。我们使用 getX() 、 getY() 函数得到 x、y 值，然后显示出来。我们还计算了该点与原点的距离，并显示了三个点的距离。我们还使用 equals() 功能显示任意两点是否相等，使用 distance() 功能显示两点之间的距离。
Java 语言(一种计算机语言，尤用于创建网站)
// Java program to create 3 Point2D objects and display
// their coordinates and distance from origin and
// check which of the 3 points are similar and
// their distances between two points
import javafx.geometry.Point2D;
public class Point2D_2 {
// Main Method
public static void main(String args[])
{
// Create three point2D objects
Point2D point2d_1 = new Point2D(120.0f, 50.0f);
Point2D point2d_2 = new Point2D(120.0f, 50.0f);
Point2D point2d_3 = new Point2D(200.0f, 120.0f);
// Display the coordinates of the 3 points
display(point2d_1);
display(point2d_2);
display(point2d_3);
// Check whether any point is equal to other or not
System.out.println("Point 1 equals Point 2 = "
+ point2d_1.equals(point2d_2));
System.out.println("Point 2 equals Point 3 = "
+ point2d_2.equals(point2d_3));
System.out.println("Point 3 equals Point 1 = "
+ point2d_3.equals(point2d_1));
// distance between two points
System.out.println("Distance between point 1 and point 2 = "
+ point2d_1.distance(point2d_2));
System.out.println("Distance between point 2 and point 3 = "
+ point2d_2.distance(point2d_3));
System.out.println("Distance between point 3 and point 1 = "
+ point2d_3.distance(point2d_1));
}
// display method
public static void display(Point2D point2d)
{
double x, y;
// get the coordinates of the point
x = point2d.getX();
y = point2d.getY();
// display the coordinates of the point
System.out.println("x coordinate = " + x
+ ", y coordinate = " + y);
// print its distance from origin
System.out.println("Distance from origin = "
+ point2d.distance(0, 0));
}
}
输出:
x coordinate = 120.0, y coordinate = 50.0
Distance from origin = 130.0
x coordinate = 120.0, y coordinate = 50.0
Distance from origin = 130.0
x coordinate = 200.0, y coordinate = 120.0
Distance from origin = 233.23807579381202
Point 1 equals Point 2 = true
Point 2 equals Point 3 = false
Point 3 equals Point 1 = false
Distance between point 1 and point 2 = 0.0
Distance between point 2 and point 3 = 106.30145812734649
Distance between point 3 and point 1 = 106.30145812734649
注意:上述程序可能无法在在线 IDE 中运行。请使用离线编译器。 参考:https://docs . Oracle . com/JavaFX/2/API/JavaFX/geometry/point2d . html
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