JavaFX - 并行转换

正如我们之前学到的，JavaFX 允许您在节点上应用多个转换。这可以通过一次应用一个转换（称为顺序转换）或一次应用多个转换（称为并行转换）来完成。

并行转换顾名思义，是在单个对象上同时应用多个转换。例如，应用这些转换的 JavaFX 节点可以在从一个位置移动到另一个位置的同时增长大小。这可以通过同时应用缩放和平移转换来实现。

让我们在本节中详细了解有关并行转换的更多信息。

并行转换

ParallelTransition 类用于在 JavaFX 节点上并行播放多个转换。此类属于 javafx.animation 包。应用于节点的所有转换都是此类的子转换，它们继承其 node 属性；如果未指定其节点属性。

示例

以下程序演示了 JavaFX 中的并行转换。将此代码保存在名为 parallelTransitionExample.java 的文件中。

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); 
   } 
}

使用以下命令从命令提示符编译并执行保存的 java 文件。

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

输出

执行上述程序后，将生成一个如下所示的 JavaFX 窗口。