解释 JavaFX 中 2D 形状的联合操作

javaobject oriented programmingprogramming更新于 2025/10/11 21:32:17

此操作将两个或多个形状作为输入，并返回它们合并后所占的面积，如下所示。

javafx.scene.shape.Shape 类的 union()(静态)方法接受两个 Shape 对象并返回给定对象的联合操作的结果。

示例

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 JavaFXUnionExample extends Application {
   public void start(Stage stage) {
      //绘制圆圈 1
      Circle circle1 = new Circle();
      circle1.setCenterX(230.0f);
      circle1.setCenterY(100.0f);
      circle1.setRadius(75.0f);
      circle1.setFill(Color.DARKRED);
      //绘制圆2
      Circle circle2 = new Circle();
      circle2.setCenterX(280.0f);
      circle2.setCenterY(170.0f);
      circle2.setRadius(75.0f);
      circle2.setFill(Color.DARKRED);
      //绘制圆3
      Circle circle3 = new Circle();
      circle3.setCenterX(330.0f);
      circle3.setCenterY(100.0f);
      circle3.setRadius(75.0f);
      circle3.setFill(Color.DARKRED);
      //联合操作
      Shape union = Shape.union(circle1, circle2);
      union = Shape.union(union, circle3);
      union.setFill(Color.RED);
      //设置舞台
      Group root = new Group(circle1, circle2, circle3, union);
      Scene scene = new Scene(root, 595, 300);
      stage.setTitle("Union Operation");
      stage.setScene(scene);
      stage.show();
   }
   public static void main(String args[]){
      launch(args);
   }
}