JavaFX節點隨機移動

Question

我想製作一個「矩形」&每次涉及它的起始位置時，將它的座標更改爲隨機位置。首先，我甚至不知道是否可以這樣做，如果是這樣的話，我想要一個它如何工作的例子。 JavaFX對我來說是一件新事物，所以我對它不瞭解很多，所以我將它移動到了一個隨機位置（矩形），它無限循環，這很好，但不是我所需要的：D。

public class Java2 extends Application { 


    public static final int PANEL_WIDTH = 600; 
    public static final int PANEL_HEIGHT = 600; 




    @Override 
    public void start(Stage primaryStage) { 

     Random ran = new Random(); 

     int loc= ran.nextInt(600 - 300 + 1) + 300; //min=300 , max=600 

     Rectangle rekt = new Rectangle(20, 20); 

     Pane root = new Pane(); 

     root.getChildren().add(rekt); 

     Scene scene = new Scene(root, PANEL_WIDTH, PANEL_HEIGHT); 




PathTransition pathTransition = new PathTransition(); 
Path path = new Path(); 

path.getElements().add(new MoveTo(20,20)); 
path.getElements().add(new LineTo(loc,600)); 


pathTransition.setDuration(javafx.util.Duration.millis(4000)); 
pathTransition.setPath(path); 
pathTransition.setNode(rekt); 
    pathTransition.setOrientation(
PathTransition.OrientationType.ORTHOGONAL_TO_TANGENT); 
pathTransition.setCycleCount(Timeline.INDEFINITE); 
pathTransition.setAutoReverse(true); 
pathTransition.play(); 






     primaryStage.setTitle("Hello World!"); 
     primaryStage.setScene(scene); 
     primaryStage.show(); 
     r1.requestFocus(); 
    } 

    /** 
    * @param args the command line arguments 
    */ 
    public static void main(String[] args) { 
     launch(args); 
    } 

} 

Answer 1

可以使用PathTransition的setOnFinished方法，並在那裏添加一個新的路徑，並再次播放路徑轉換。

我將週期數設置爲2.週期1是一個方向，但由於您已啓用自動反向，因此週期2是回到原點的方向。

完成後，會設置一條新路徑，並再次播放過渡。

import javafx.animation.PathTransition; 
import javafx.application.Application; 
import javafx.scene.Scene; 
import javafx.scene.layout.Pane; 
import javafx.scene.shape.LineTo; 
import javafx.scene.shape.MoveTo; 
import javafx.scene.shape.Path; 
import javafx.scene.shape.Rectangle; 
import javafx.stage.Stage; 

public class Java2 extends Application { 

    public static final int PANEL_WIDTH = 600; 
    public static final int PANEL_HEIGHT = 600; 

    Random ran = new Random(); 

    @Override 
    public void start(Stage primaryStage) { 

     Rectangle rekt = new Rectangle(20, 20); 

     Pane root = new Pane(); 

     root.getChildren().add(rekt); 

     Scene scene = new Scene(root, PANEL_WIDTH, PANEL_HEIGHT); 

     PathTransition pathTransition = new PathTransition(); 

     pathTransition.setDuration(javafx.util.Duration.millis(500)); 
     pathTransition.setPath(createPath()); 
     pathTransition.setNode(rekt); 
     pathTransition.setOrientation(PathTransition.OrientationType.ORTHOGONAL_TO_TANGENT); 
     pathTransition.setCycleCount(2); 
     pathTransition.setAutoReverse(true); 
     pathTransition.setOnFinished(e -> { 

      pathTransition.setPath(createPath()); 
      pathTransition.play(); 

     }); 
     pathTransition.play(); 

     primaryStage.setTitle("Hello World!"); 
     primaryStage.setScene(scene); 
     primaryStage.show(); 
    } 

    private Path createPath() { 

     int loc = ran.nextInt(600 - 300 + 1) + 300; // min=300 , max=600 

     Path path = new Path(); 

     path.getElements().add(new MoveTo(20, 20)); 
     path.getElements().add(new LineTo(loc, 600)); 

     return path; 

    } 

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

}