联盟运作（Union Operation）

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2023-12-01

此操作将两个或多个形状作为输入，并返回它们占用的区域，如下所示。

您可以使用名为union()的方法对形状执行并集操作。由于这是一个静态方法，您应该使用类名（Shape或其子类）来调用它，如下所示。

Shape shape = Shape.subtract(circle1, circle2);

例子 (Example)

以下是联合操作的示例。在这里，我们绘制两个圆圈并对它们执行并集操作。将此代码保存在名为unionExample.java的文件中。

import javafx.application.Application; 
import javafx.scene.Group; 
import javafx.scene.Scene; 
import javafx.scene.paint.Color; 
import javafx.stage.Stage; 
import javafx.scene.shape.Circle; 
import javafx.scene.shape.Shape; 
public class UnionExample extends Application {  
   @Override 
   public void start(Stage stage) { 
      //Drawing Circle1 
      Circle circle1 = new Circle();         
      //Setting the position of the circle 
      circle1.setCenterX(250.0f); 
      circle1.setCenterY(135.0f); 
      //Setting the radius of the circle 
      circle1.setRadius(100.0f); 
      //Setting the color of the circle 
      circle1.setFill(Color.DARKSLATEBLUE);     
      //Drawing Circle2 
      Circle circle2 = new Circle();         
      //Setting the position of the circle 
      circle2.setCenterX(350.0f);
      circle2.setCenterY(135.0f); 
      //Setting the radius of the circle 
      circle2.setRadius(100.0f); 
      //Setting the color of the circle  
      circle2.setFill(Color.BLUE);  
      //Performing union operation on the circle 
      Shape shape = Shape.union(circle1, circle2); 
      //Setting the fill color to the result 
      shape.setFill(Color.DARKSLATEBLUE); 
      //Creating a Group object  
      Group root = new Group(shape); 
      //Creating a scene object 
      Scene scene = new Scene(root, 600, 300);  
      //Setting title to the Stage 
      stage.setTitle("Union Example"); 
      //Adding scene to the stage  
      stage.setScene(scene); 
      //Displaying the contents of the stage 
      stage.show(); 
   }      
   public static void main(String args[]){ 
      launch(args); 
   } 
}

使用以下命令从命令提示符编译并执行保存的java文件。

javac UnionExample.java 
java UnionExample

执行时，上面的程序生成一个显示以下输出的JavaFX窗口 -