JavaFX - 並行轉換

正如我們之前學到的，JavaFX 允許您在節點上應用多個轉換。這可以透過一次應用一個轉換（稱為順序轉換）或一次應用多個轉換（稱為並行轉換）來完成。

並行轉換顧名思義，是在單個物件上同時應用多個轉換。例如，應用這些轉換的 JavaFX 節點可以在從一個位置移動到另一個位置的同時增長大小。這可以透過同時應用縮放和平移轉換來實現。

讓我們在本節中詳細瞭解有關並行轉換的更多資訊。

並行轉換

ParallelTransition 類用於在 JavaFX 節點上並行播放多個轉換。此類屬於 javafx.animation 包。應用於節點的所有轉換都是此類的子轉換，它們繼承其 node 屬性；如果未指定其節點屬性。

示例

以下程式演示了 JavaFX 中的並行轉換。將此程式碼儲存在名為 parallelTransitionExample.java 的檔案中。

import javafx.animation.ParallelTransition; 
import javafx.animation.PathTransition; 
import javafx.animation.ScaleTransition; 
import javafx.animation.TranslateTransition; 

import javafx.application.Application; 

import javafx.scene.Group; 
import javafx.scene.Scene; 
import javafx.scene.paint.Color;  
import javafx.scene.shape.CubicCurveTo; 
import javafx.scene.shape.MoveTo; 
import javafx.scene.shape.Path; 
import javafx.scene.shape.Rectangle; 

import javafx.stage.Stage; 
import javafx.util.Duration; 
         
public class parallelTransitionExample extends Application { 
   @Override 
   public void start(Stage stage) {      
      //Drawing a Rectangle 
      Rectangle rectangle = new Rectangle(); 
      
      //Setting the position of the rectangle 
      rectangle.setX(75.0f); 
      rectangle.setY(75.0f); 
      
      //Setting the width of the rectangle 
      rectangle.setWidth(100.0f); 
      
      //Setting the height of the rectangle 
      rectangle.setHeight(100.0f);      
      
      //setting the color of the rectangle 
      rectangle.setFill(Color.BLUEVIOLET); 
      
      //Instantiating the path class 
      Path path = new Path(); 
      
      //Creating the MoveTo path element 
      MoveTo moveTo = new MoveTo(100, 150); 
      
      //Creating the Cubic curve path element 
      CubicCurveTo cubicCurveTo = new CubicCurveTo(400, 40, 175, 250, 500, 150); 
      
      //Adding the path elements to Observable list of the Path class 
      path.getElements().add(moveTo); 
      path.getElements().add(cubicCurveTo);     
       
      //Creating Path Transition  
      PathTransition pathTransition = new PathTransition(); 
      
      //Setting the duration of the transition 
      pathTransition.setDuration(Duration.millis(1000)); 
      
      //Setting the node for the transition 
      pathTransition.setNode(rectangle); 
      
      //Setting the path for the transition  
      pathTransition.setPath(path); 
      
      //Setting the orientation of the path 
      pathTransition.setOrientation(
         PathTransition.OrientationType.ORTHOGONAL_TO_TAN GENT); 
      
      //Setting the cycle count for the transition 
      pathTransition.setCycleCount(5); 
      
      //Setting auto reverse value to false 
      pathTransition.setAutoReverse(false); 
      
      //Playing the animation 
      pathTransition.play();         
       
      //Creating Translate Transition 
      TranslateTransition translateTransition = new TranslateTransition(); 
      
      //Setting the duration for the transition 
      translateTransition.setDuration(Duration.millis(1000)); 
      
      //Setting the node for the transition 
      translateTransition.setNode(rectangle); 
      
      //Setting the axis and length of the transition 
      translateTransition.setByX(300); 
      
      //Setting the cycle count of the transition 
      translateTransition.setCycleCount(5); 
      
      //Setting auto reverse value to false 
      translateTransition.setAutoReverse(false);  
       
      //Creating scale Transition 
      ScaleTransition scaleTransition = new ScaleTransition(); 
      
      //Setting the duration for the transition  
      translateTransition.setDuration(Duration.millis(1000)); 
      
      //Setting the node for the transition 
      translateTransition.setNode(rectangle); 
      
      //Setting the dimensions for scaling 
      scaleTransition.setByY(1.5); 
      scaleTransition.setByX(1.5); 
      
      //Setting the cycle count for the translation  
      scaleTransition.setCycleCount(5); 
      
      //Setting auto reverse value to true 
      scaleTransition.setAutoReverse(false);       
       
      //Applying parallel Translation to the circle 
      ParallelTransition parallelTransition = new ParallelTransition(
         rectangle, pathTransition, translateTransition, scaleTransition ); 
      
      //Playing the animation 
      parallelTransition.play(); 
         
      //Creating a Group object  
      Group root = new Group(rectangle); 
         
      //Creating a scene object 
      Scene scene = new Scene(root, 600, 300); 
      
      //Setting title to the Stage 
      stage.setTitle("Parallel Transition 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); 
   } 
}

使用以下命令從命令提示符編譯並執行儲存的 java 檔案。

javac --module-path %PATH_TO_FX% --add-modules javafx.controls parallelTransitionExample.java 
java --module-path %PATH_TO_FX% --add-modules javafx.controls parallelTransitionExample 

輸出

執行上述程式後，將生成一個如下所示的 JavaFX 視窗。