package exercise_30_05;

import javafx.application.Application;

import javafx.geometry.Pos;

import javafx.scene.Scene;

import javafx.scene.control.Button;

import javafx.scene.input.MouseButton;

import javafx.scene.layout.BorderPane;

import javafx.scene.layout.HBox;

import javafx.stage.Stage;

public class Exercise_30_05 extends Application {

private final static double WIDTH = 300;

private final static double HEIGHT = 300;

private final static double RADIUS = 100;

@Override

public void start(Stage primaryStage) {

FanPane fanPane = new FanPane(WIDTH, HEIGHT, RADIUS);

HBox hBox = new HBox(5);

hBox.setAlignment(Pos.CENTER);

Button pause = new Button("Pause");

Button resume = new Button("Resume");

Button reverse = new Button("Reverse");

hBox.getChildren().addAll(pause, resume, reverse);

BorderPane pane = new BorderPane(fanPane);

pane.setBottom(hBox);

Scene scene = new Scene(pane, WIDTH, HEIGHT);

primaryStage.setTitle("Exercise_30_05");

primaryStage.setScene(scene);

primaryStage.show();

pause.setOnAction(e -> fanPane.suspend());

resume.setOnAction(e -> fanPane.resume());

reverse.setOnAction(e -> fanPane.reverse());

pane.setOnMouseClicked(e -> {

if(e.getButton().equals(MouseButton.PRIMARY)) {

fanPane.increaseSpeed();

}

else if(e.getButton().equals(MouseButton.SECONDARY)) {

fanPane.decreaseSpeed();

}

});

}

public static void main(String[] args) {

launch(args);

}

}

package exercise_30_05;

import javafx.application.Platform;

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;

public class FanPane extends Pane {

private double rotationAngle = 1;

private Arc[] arcs = new Arc[4];

private Circle c;

private int sleepTime = 10;

private Thread thread = new Thread(() -> {

try {

while(true) {

Platform.runLater(() -> spin());

Thread.sleep(sleepTime);

}

}

catch (InterruptedException ex) {

}

});

public FanPane(double paneWidth, double paneHeight, double radius) {

c = new Circle(paneWidth * 0.5, paneHeight * 0.5, radius);

c.setStroke(Color.BLACK);

c.setFill(Color.TRANSPARENT);

double angle = 40;

for(int i = 0; i < arcs.length; i++) {

arcs[i] = new Arc(c.getCenterX(), c.getCenterY(), c.getRadius() * 0.9, c.getRadius() * 0.9, 15 + i * 90, angle);

arcs[i].setType(ArcType.ROUND);

arcs[i].setFill(Color.RED);

}

getChildren().add(c);

getChildren().addAll(arcs);

thread.start();

}

public void spin() {

for(int i = 0; i < arcs.length; i++) {

arcs[i].setStartAngle(arcs[i].getStartAngle() + rotationAngle);

}

}

public void resume() {

thread.resume();

}

public void suspend() {

thread.suspend();

}

public void reverse() {

rotationAngle *= -1;

}

public void increaseSpeed() {

if(sleepTime > 1) {

sleepTime--;

}

}

public void decreaseSpeed() {

sleepTime++;

}

}