JavaFx 判断鼠标点击的是背景还是圆圈

Question

我正在创建一个圆圈从屏幕顶部落到底部的游戏。单击圆圈时，它假设会在屏幕顶部的随机位置重新生成并具有随机颜色。我很确定我的问题与我的线有关，以确定鼠标单击是否在其中一个圆圈上是否正常工作。所以我的问题是如何确定鼠标单击是发生在其中一个圆圈上还是发生在背景屏幕上？下面一行有什么问题？（因为我几乎可以肯定我的问题出在那一行）

if((shape.get(i).getLayoutX() == e.getX())&&(shape.get(i).getLayoutY() == e.getY())){

我的全部代码在这里：

public class ShapesWindow extends Application{
 final int WIDTH = 640;
 final int HEIGHT = WIDTH / 12 * 9;
 Random r = new Random();
 Circle circle;
 double yCord;
 long startNanoTime;

 Group root = new Group();
 Scene scene = new Scene(root, WIDTH, HEIGHT);
 Canvas can = new Canvas(WIDTH,HEIGHT);
 GraphicsContext gc = can.getGraphicsContext2D();
 ArrayList<Shape> shape = new ArrayList<>();

 @Override
 public void start(Stage theStage) throws Exception {
     theStage.setTitle("Click the bubbles!");
     theStage.setScene(scene);
     root.getChildren().add(can);
     gc.setFill(Color.LIGHTBLUE);
     gc.fillRect(0,0,WIDTH,HEIGHT);

     /* This adds 10 circles to my Group */
     for(int i = 0; i < 10; i++){
        gc.setFill(Color.LIGHTBLUE);
        gc.fillRect(0,0,WIDTH,HEIGHT);
        circle = new Circle(15,randomColor());
        root.getChildren().add(circle);
        circle.setLayoutX(r.nextInt(WIDTH+15));
        circle.setLayoutY(0);
        shape.add(circle);
    }

    /* This my attempt at trying to handle the Mouse Events for each thing */
    for(int i = 0; i < 10; i++){
        shape.get(i).setOnMouseClicked(
                new EventHandler<MouseEvent>(){
                    public void handle(MouseEvent e){
                        shapeClicked(e);

                    }
                });
    }

    startNanoTime = System.nanoTime();
    new AnimationTimer(){
        public void handle(long currentNanoTime){
            double t = (currentNanoTime - startNanoTime) / 1000000000.0;
            yCord = t*20;

            for(int i = 0; i < 10; i++){
                /* This if statment allows nodes to wrap around from bottom to top */
                if(yCord >=HEIGHT){
                    shape.get(i).setLayoutX(r.nextInt(WIDTH+15));
                    shape.get(i).setLayoutY(0);
                    shape.get(i).setFill(randomColor());
                    resetNan();
                }

                shape.get(i).setLayoutY(yCord);
            }
        }
    }.start();
    theStage.show();
}

 /*
  * This Function is suppose the change the color and position of the  circle that was clicked
  */
 public void shapeClicked(MouseEvent e){
    for(int i = 0; i < shape.size();i++){
        if((shape.get(i).getLayoutX() == e.getX())&&(shape.get(i).getLayoutY() == e.getY())){
            shape.get(i).setLayoutX(r.nextInt(WIDTH+15));
            shape.get(i).setLayoutY(0);
            shape.get(i).setFill(randomColor());
    }
 }

 /*
  * This allows the value of startNanoTime to be indrectly change it  can not be changed diretly
  * inside of handle() inside of the Animation class
  */
 public void resetNan(){
     startNanoTime = System.nanoTime();
 }

 public Color randomColor(){
     double R = r.nextDouble();
     double G = r.nextDouble();
     double B = r.nextDouble();
     double opacity = .6;
     Color color = new Color(R, G, B, opacity);
     return color.brighter();
 }
 public static void main(String[] args){
     launch(args);
 }

}

Answer 1

为什么不只是

for(int i = 0; i < 10; i++){
    Shape s = shape.get(i);
    s.setOnMouseClicked(
            new EventHandler<MouseEvent>(){
                public void handle(MouseEvent e){
                    s.setLayoutX(r.nextInt(WIDTH+15));
                    s.setLayoutY(0);
                    s.setFill(randomColor());
                }
            });
}

Answer 2

我知道时间已经过去很久了，但是如果其他人需要检查鼠标单击事件是在圆形还是任何其他形状上，最好使用内置的 .contains 方法。感谢来自 JavaFx geometry class 的 Point2D，您可以检查点击（x，y 坐标）是否在形状上，您不必担心点击位置：在中心或边界.

for (Circle circle:listOfCircles) {
                Point2D point2D = new Point2D(event.getX(),event.getY());
                if (circle.contains(point2D)){
                    System.out.println("circle clicked");
                }

            }

JavaFx 判断鼠标点击的是背景还是圆圈

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