*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{
	@Override
	public 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