Javafx 简明教程

JavaFX - Pause Transition

暂停转换是一种由 JavaFX 提供的转换，它会在继续按顺序执行其他转换前，暂停动画一段时间。

可以通过两种方式对 JavaFX 节点应用多个转换：顺序地或并行地。当顺序应用时，你还可以暂停动画一段时间，然后再应用另一个转换。这有助于在需要以更清晰的方式查看所应用转换的情况下。

让我们在本章中进一步了解这种转换。

Pause Transition

PauseTransition 类属于 javafx.animation 包，并在按顺序对 JavaFX 节点应用多个转换时使用。此类在每次转换后都会暂停动画指定持续时间。应用于该节点的所有转换都是此类及其节点属性的子转换（前提是未指定它们自己的节点属性）。

Example

以下是演示 JavaFX 中暂停转换的程序。将此代码保存在名为 PauseTransitionExample.java 的文件中。

import javafx.animation.PauseTransition;
import javafx.animation.ScaleTransition;
import javafx.animation.SequentialTransition;
import javafx.animation.TranslateTransition;

import javafx.application.Application;
import static javafx.application.Application.launch;

import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.paint.Color;
import javafx.scene.shape.Circle;

import javafx.stage.Stage;
import javafx.util.Duration;

public class PauseTransitionExample extends Application {
   @Override
   public void start(Stage stage) {
      //Drawing a Circle
      Circle circle = new Circle();

      //Setting the position of the circle
      circle.setCenterX(150.0f);
      circle.setCenterY(135.0f);

      //Setting the radius of the circle
      circle.setRadius(50.0f);

      //Setting the color of the circle
      circle.setFill(Color.BROWN);

      //Setting the stroke width of the circle
      circle.setStrokeWidth(20);

      //Creating a Pause Transition
      PauseTransition pauseTransition = new PauseTransition();

      //Setting the duration for the transition
      pauseTransition.setDuration(Duration.millis(1000));

      //Creating Translate Transition
      TranslateTransition translateTransition = new TranslateTransition();

      //Setting the duration for the transition
      translateTransition.setDuration(Duration.millis(1000));

      //Setting the node of the transition
      translateTransition.setNode(circle);

      //Setting the value of the transition along the x axis
      translateTransition.setByX(300);

      //Setting the cycle count for the stroke
      translateTransition.setCycleCount(5);

      //Setting auto reverse value to true
      translateTransition.setAutoReverse(false);

      //Creating scale Transition
      ScaleTransition scaleTransition = new ScaleTransition();

      //Setting the duration for the transition
      scaleTransition.setDuration(Duration.millis(1000));

      //Setting the node for the transition
      scaleTransition.setNode(circle);

      //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 Sequential transition to the circle
      SequentialTransition sequentialTransition = new SequentialTransition(
         circle, translateTransition, pauseTransition, scaleTransition );

      //Playing the animation
      sequentialTransition.play();

      //Creating a Group object
      Group root = new Group(circle);

      //Creating a scene object
      Scene scene = new Scene(root, 600, 300);

      //Setting title to the Stage
      stage.setTitle("Pause 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已保存的 java 文件。

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

执行后，上述程序会生成如下所示的 JavaFX 窗口。

pause transition