JavaFX 矩形宽度动画 [英] JavaFX rectangle width animation

问题描述

只是一个问题...是否可以将矩形宽度的变化显示为动画?矩形本身是一个状态栏，所以在 x 方向上的缩放不能完成这项工作.

谢谢

解决方案

一种方法是在

<小时>

SSCCE:

public class RectangleWidthAnimation extends Application{@覆盖public void start(Stage primaryStage) 抛出异常 {矩形 statusBar = new Rectangle(300, 100);Button animationButton = new Button("动画宽度减少25");animationButton.setOnAction(event -> {System.out.println("动画开始:width = " + statusBar.getWidth());KeyValue widthValue = new KeyValue(statusBar.widthProperty(), statusBar.getWidth() - 25);KeyFrame frame = new KeyFrame(Duration.seconds(2), widthValue);时间线时间线 = 新时间线(帧)；时间线.播放()；timeline.setOnFinished(finishedEvent -> System.out.println("动画结束:width = " + statusBar.getWidth()));});VBox 容器 = new VBox(10, statusBar, animationButton);//使用这些对齐进行实验container.setAlignment(Pos.CENTER);//container.setAlignment(Pos.CENTER_LEFT);//container.setAlignment(Pos.CENTER_RIGHT);primaryStage.setScene(new Scene(container, 350, 150));primaryStage.show();}}

<小时>上述的替代方法可能是使用转换，您可以阅读关于 这里

just a question... is it possible to show the change of the width of a rectangle as an animation? The rectangle itself is a statusbar so a scale in both x directions does not do the job.

thx

解决方案

One method would be to animate the width modification within a Timeline as opposed to scaling in both directions. You can simulate the direction by modifying the alignment of the Rectangle's parent

Alignment values:

• Pos.CENTER : Appears as though the change is occurring in both directions
• Pos.CENTER_LEFT: Appears as though the change is occurring from the right
• Pos.CENTER_RIGHT: Appears as though the change is occurring from the left

By experimenting with alignments you can choose the one that best fits your current status bar

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Visual representation:

Order of alignment: Right | Center | Left

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SSCCE:

public class RectangleWidthAnimation extends Application{
    @Override
    public void start(Stage primaryStage) throws Exception {
        Rectangle statusBar = new Rectangle(300, 100);
        Button animationButton = new Button("Animate width decrease by 25");
        animationButton.setOnAction(event -> {
            System.out.println("Animation start: width = " + statusBar.getWidth());
            KeyValue widthValue = new KeyValue(statusBar.widthProperty(), statusBar.getWidth() - 25);
            KeyFrame frame = new KeyFrame(Duration.seconds(2), widthValue);
            Timeline timeline = new Timeline(frame);
            timeline.play();
            timeline.setOnFinished(finishedEvent -> System.out.println("Animation end: width = " + statusBar.getWidth()));
        });

        VBox container = new VBox(10, statusBar, animationButton);

        //Experiment with these alignments
        container.setAlignment(Pos.CENTER);
        //container.setAlignment(Pos.CENTER_LEFT);
        //container.setAlignment(Pos.CENTER_RIGHT);

        primaryStage.setScene(new Scene(container, 350, 150));
        primaryStage.show();
    }
}

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An alternative to the above could be to use transitions, which you can read about here

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