不断检查子弹是否接触过节点

Question

我有一个非常简单的程序，你可以用你的W，A，
S，D和space键进行拍摄。所有的拍摄和移动动画都可以工作，但是我不确定如何实现一个系统，在该系统中，程序会不断检查子弹是否已碰到节点（例如圆圈）。

我本以为可以ArrayList存储所有项目符号，然后使用TimerTask来检查项目符号是否接触到节点；但是我觉得那样会减慢程序的速度，并且子弹可以在TimerTask等待再次执行时通过它们。

任何建议都会有所帮助。

代码：Pastebin

import javafx.application.Application;
import javafx.stage.Stage;
import javafx.scene.Scene;
import javafx.scene.control.*;
import javafx.scene.layout.Pane;
import javafx.scene.shape.Circle;
import javafx.animation.*;
import javafx.util.Duration;
public class functionalShooter extends Application {
    private String currentDirection = "W";
    public static void main(String[] args){ launch(args);   }
    @Override public void start(Stage stage) throws Exception{
        Pane root = new Pane();
        Scene scene = new Scene(root, 600, 400);
        stage.setScene(scene);
        stage.setResizable(false);
        stage.show();

        Circle player = new Circle(10);
        player.setLayoutX(300);
        player.setLayoutY(200);

        Circle other = new Circle(100, 100, 10);

        root.getChildren().addAll(player, other);

        //key events
        scene.setOnKeyPressed(event -> {
            switch(event.getCode()){
                case A:
                    player.setLayoutX(player.getLayoutX()-10);
                    currentDirection = "A";
                    break;
                case D:
                    player.setLayoutX(player.getLayoutX()+10);
                    currentDirection = "D";
                    break;
                case W:
                    player.setLayoutY(player.getLayoutY()-10);
                    currentDirection = "W";
                    break;
                case S:
                    player.setLayoutY(player.getLayoutY()+10);
                    currentDirection = "S";
                    break;
                case SPACE:
                    if (currentDirection.equals("D")){
                        Circle newCircle = new Circle(player.getLayoutX()+10, player.getLayoutY(), 5);
                        root.getChildren().add(newCircle);
                        shoot(newCircle);
                    }
                    else if (currentDirection.equals("A")){
                        Circle newCircle = new Circle(player.getLayoutX()-10, player.getLayoutY(), 5);
                        root.getChildren().add(newCircle);
                        shoot(newCircle);
                    }
                    else if (currentDirection.equals("S")){
                        Circle newCircle = new Circle(player.getLayoutX(), player.getLayoutY()+10, 5);
                        root.getChildren().add(newCircle);
                        shoot(newCircle);
                    }
                    else {
                        Circle newCircle = new Circle(player.getLayoutX(), player.getLayoutY()-10, 5);
                        root.getChildren().add(newCircle);
                        shoot(newCircle);
                    }
                    break;
            }
        });
    }

    private void shoot(Circle bullet){
        Timeline timeline = new Timeline();
        if (currentDirection.equals("D")){
            KeyValue start = new KeyValue(bullet.translateXProperty(), 0);
            KeyValue end = new KeyValue(bullet.translateXProperty(), 800);
            KeyFrame startF = new KeyFrame(Duration.ZERO, start);
            KeyFrame endF = new KeyFrame(Duration.seconds(10), end);
            timeline.getKeyFrames().addAll(startF, endF);
        }
        else if (currentDirection.equals("A")){
            KeyValue start = new KeyValue(bullet.translateXProperty(), 0);
            KeyValue end = new KeyValue(bullet.translateXProperty(), -800);
            KeyFrame startF = new KeyFrame(Duration.ZERO, start);
            KeyFrame endF = new KeyFrame(Duration.seconds(10), end);
            timeline.getKeyFrames().addAll(startF, endF);
        }
        else if (currentDirection.equals("S")){
            KeyValue start = new KeyValue(bullet.translateYProperty(), 0);
            KeyValue end = new KeyValue(bullet.translateYProperty(), 800);
            KeyFrame startF = new KeyFrame(Duration.ZERO, start);
            KeyFrame endF = new KeyFrame(Duration.seconds(10), end);
            timeline.getKeyFrames().addAll(startF, endF);
        }
        else{
            KeyValue start = new KeyValue(bullet.translateYProperty(), 0);
            KeyValue end = new KeyValue(bullet.translateYProperty(), -800);
            KeyFrame startF = new KeyFrame(Duration.ZERO, start);
            KeyFrame endF = new KeyFrame(Duration.seconds(10), end);
            timeline.getKeyFrames().addAll(startF, endF);
        }
        timeline.setAutoReverse(false);
        timeline.setCycleCount(1);
        timeline.play();
    }
}

Answer 1

您可以使用提供给每个相关对象的自定义样式检查bullet相交。下面的片段添加了一个到，但你需要一个相同的，每个方向一个。实现是线性的，只是返回不变，但是您也可以查看此抛物线插值器。我还制作了一个类变量，可以访问。我毫不迟疑地将十几发子弹飞向空中。请注意，您不需要一个值：“将使用当时的当前目标值合成一个”。otherShape.intersect()InterpolatorKeyValueInterpolator``shoot()``tother``shoot()``start

private Circle other = new Circle(100, 100, 10);
…
else {
    KeyValue end = new KeyValue(bullet.translateYProperty(), -800, new Interpolator() {
        @Override
        protected double curve(double t) {
            if (!Shape.intersect(bullet, other).getBoundsInLocal().isEmpty()) {
                System.out.println("Intersection");
            }
            return t;
        }
    });
    KeyFrame endF = new KeyFrame(Duration.seconds(10), end);
    timeline.getKeyFrames().addAll(endF);
}