Java语言程序设计基础篇_编程练习题*15.26 (改变透明度)

*15.26 (改变透明度)

重写编程练习题15.24，当球摆动的时候改变球的透明度

• 思路：
• 很简单，改写编程练习题15.24，为小圆Circle添加一个FadeTransition，再把暂停和开始方法设置在鼠标事件中

代码示例：编程练习题15_26FadeAnimationSwinging.java 

package chapter_15;import javafx.animation.FadeTransition;
import javafx.animation.PathTransition;
import javafx.animation.Timeline;
import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.layout.Pane;
import javafx.scene.paint.Color;
import javafx.scene.shape.Arc;
import javafx.scene.shape.ArcType;
import javafx.scene.shape.Circle;
import javafx.stage.Stage;
import javafx.util.Duration;public class 编程练习题15_26FadeAnimationSwinging extends Application{@Overridepublic void start(Stage primaryStage) throws Exception {Pane pane = new Pane();Arc arc = new Arc(150, 200, 100, 40, 180, 180);arc.setType(ArcType.OPEN);arc.setFill(Color.WHITE);arc.setStroke(Color.BLACK);pane.getChildren().add(arc);Circle circle = new Circle(10);circle.setFill(Color.ORANGE);pane.getChildren().add(circle);PathTransition pt = new PathTransition();pt.setDuration(Duration.millis(2000));pt.setPath(arc);pt.setNode(circle);pt.setCycleCount(Timeline.INDEFINITE);pt.setAutoReverse(true);pt.play();pane.setOnMousePressed(e -> pt.pause());pane.setOnMouseReleased(e -> pt.play());FadeTransition ft = new FadeTransition(Duration.millis(2000),circle);ft.setFromValue(1.0);ft.setToValue(0.1);ft.setCycleCount(Timeline.INDEFINITE);ft.setAutoReverse(true);ft.play();pane.setOnMousePressed(e -> {ft.pause();pt.pause();});pane.setOnMouseReleased(e ->{ft.play();pt.play();});Scene scene = new Scene(pane, 300, 300);primaryStage.setTitle("编程练习题15_26FadeAnimationSwinging");primaryStage.setScene(scene);primaryStage.show();}public static void main(String[] args) {Application.launch(args);}
}

•  结果展示