設置佈局後的JavaFX碰撞

Question

在我使用setLayoutX和setLayoutY設置我的節點的佈局之後，我嘗試使用node.getBoundsInParent().intersects檢查衝突，但衝突回來，好像節點從未移動過一樣。佈局是否正確改變？我需要以其他方式更新物理位置嗎？

Answer 1

這似乎應該工作。我可能會操縱行的startX，startY，endX和endY屬性，而不是layoutX和layoutY，因爲我認爲這更直觀。但是要麼改變父屬性的邊界。

下面是一些測試代碼：

import java.util.stream.Stream; 

import javafx.application.Application; 
import javafx.collections.FXCollections; 
import javafx.geometry.Insets; 
import javafx.geometry.Pos; 
import javafx.scene.Scene; 
import javafx.scene.control.Button; 
import javafx.scene.control.ComboBox; 
import javafx.scene.control.Label; 
import javafx.scene.layout.BorderPane; 
import javafx.scene.layout.HBox; 
import javafx.scene.layout.Pane; 
import javafx.scene.paint.Color; 
import javafx.scene.shape.Line; 
import javafx.stage.Stage; 

public class LineTest extends Application { 

    @Override 
    public void start(Stage primaryStage) { 
     Pane pane = new Pane(); 
     Line line1 = new Line(50, 50, 150, 150); 
     line1.setStroke(Color.RED); 

     Line line2 = new Line(200, 150, 300, 50); 
     line2.setStroke(Color.BLUE); 

     pane.getChildren().addAll(line1, line2); 

     ComboBox<Integer> choice = new ComboBox<>(FXCollections.observableArrayList(0, 100)); 
     choice.getSelectionModel().selectedItemProperty().addListener((obs, oldValue, newValue) -> line1.setLayoutX(newValue)); 

     Button showValuesButton = new Button("Show all values"); 
     showValuesButton.setOnAction(event -> { 
      Stream.of(line1, line2).forEach(line -> { 
       System.out.printf("Layout x,y: [%.1f, %.1f]%n", line.getLayoutX(), line.getLayoutY()); 
       System.out.printf("Start: [%.1f, %.1f] End: [%.1f, %.1f]%n", line.getStartX(), line.getStartY(), line.getEndX(), line.getEndY()); 
       System.out.printf("Bounds in parent: %s%n", line.getBoundsInParent()); 

      }); 
      System.out.println("Bounds intersect? "+line1.getBoundsInParent().intersects(line2.getBoundsInParent())); 
     }); 

     HBox controls = new HBox(5, new Label("Red layout x:"), choice, showValuesButton); 
     controls.setAlignment(Pos.CENTER); 
     controls.setPadding(new Insets(5)); 

     BorderPane root = new BorderPane(); 
     root.setCenter(pane); 
     root.setBottom(controls); 

     Scene scene = new Scene(root, 600, 400); 
     primaryStage.setScene(scene); 
     primaryStage.show(); 

    } 

    public static void main(String[] args) { 
     launch(args); 
    } 
}