JavaFX学习之样例4
该代码主要是通过键盘和鼠标移动物体
import javafx.animation.TranslateTransition;import javafx.application.Application;import javafx.event.ActionEvent;import javafx.event.EventHandler;import javafx.scene.*;import javafx.scene.control.Label;import javafx.scene.input.*;import javafx.scene.paint.Color;import javafx.scene.shape.Circle;import javafx.stage.Stage;import javafx.util.Duration;public class MovementEventsDemo extends Application { private static final int KEYBOARD_MOVEMENT_DELTA = 5; private static final Duration TRANSLATE_DURATION = Duration.seconds(1); public static void main(String[] args) { launch(args); } @Override public void start(Stage stage) throws Exception { final Circle circle = createCircle(); final Group group = new Group(createInstructions(), circle); final TranslateTransition transition = createTranslateTransition(circle); final Scene scene = new Scene(group, 600, 400, Color.CORNSILK); moveCircleOnKeyPress(scene, circle); moveCircleOnMousePress(scene, circle, transition); stage.setScene(scene); stage.show(); } private Label createInstructions() { Label instructions = new Label( "Use the arrow keys to move the circle in small increments\n" + "Click the mouse to move the circle to a given location\n" + "Ctrl + Click the mouse to slowly translate the circle to a given location" ); instructions.setTextFill(Color.FORESTGREEN); return instructions; } private Circle createCircle() { final Circle circle = new Circle(200, 150, 50, Color.BLUEVIOLET); circle.setOpacity(0.7); //设置透明度 return circle; } private TranslateTransition createTranslateTransition(final Circle circle) { final TranslateTransition transition = new TranslateTransition(TRANSLATE_DURATION, circle); transition.setOnFinished(new EventHandler<ActionEvent>() { @Override public void handle(ActionEvent t) { circle.setCenterX(circle.getTranslateX() + circle.getCenterX()); circle.setCenterY(circle.getTranslateY() + circle.getCenterY()); circle.setTranslateX(0); circle.setTranslateY(0); } }); return transition; } //键盘事件，通过event.getCode()判断是哪个键输入。 private void moveCircleOnKeyPress(Scene scene, final Circle circle) { scene.setOnKeyPressed(new EventHandler<KeyEvent>() { @Override public void handle(KeyEvent event) { switch (event.getCode()) { case UP: circle.setCenterY(circle.getCenterY() - KEYBOARD_MOVEMENT_DELTA); break; case RIGHT: circle.setCenterX(circle.getCenterX() + KEYBOARD_MOVEMENT_DELTA); break; case DOWN: circle.setCenterY(circle.getCenterY() + KEYBOARD_MOVEMENT_DELTA); break; case LEFT: circle.setCenterX(circle.getCenterX() - KEYBOARD_MOVEMENT_DELTA); break; } } }); } //鼠标按下事件 private void moveCircleOnMousePress(Scene scene, final Circle circle, final TranslateTransition transition) { scene.setOnMousePressed(new EventHandler<MouseEvent>() { @Override public void handle(MouseEvent event) { if (!event.isControlDown()) { //判断是否按下ctrl键，没有直接设置circle位置，有则慢慢移动 circle.setCenterX(event.getSceneX()); circle.setCenterY(event.getSceneY()); } else { transition.setToX(event.getSceneX() - circle.getCenterX()); transition.setToY(event.getSceneY() - circle.getCenterY()); transition.playFromStart(); } } }); }}