java - 在矩形网格内单击鼠标添加球体

Question

每当我在矩形内单击时，我想添加一个球体。基本上，我使用矩形制作了这个 9X6 网格。附件是我的代码，我不知道要在 ActionEventHandler 中添加什么。

public void Settings(ActionEvent event) throws Exception
{   
    Stage primaryStage = new Stage();
    Parent root = FXMLLoader.load(getClass().getResource("/application/Settings.fxml"));
    Scene scene = new Scene(root,400,400);
    scene.getStylesheets().add(getClass().getResource("application.css").toExternalForm());
    primaryStage.setScene(scene);
    primaryStage.show();

}
@FXML
ObservableList<Integer> comboList = FXCollections.observableArrayList(3,4,5,6,7,8);
ObservableList<String> gridList = FXCollections.observableArrayList("9 X 6","15 X 10");
@Override
public void initialize(URL arg0, ResourceBundle arg1) {
    // TODO Auto-generated method stub
    combo.setItems(comboList);
    gridb.setItems(gridList);
}


public void Grid() throws Exception {
    Stage primaryStage=new Stage();
    //AnchorPane root = new AnchorPane();
    Group root = new Group();
    Scene scene = new Scene(root);
    //scene.getStylesheets().add(getClass().getResource("application.css").toExternalForm());
    primaryStage.setScene(scene);

    Rectangle r = null;
    for(int i=0;i<9;i++) {
        for(int j=0;j<6;j++) {

    r = new Rectangle(70*j,70*i,70,70);
    r.setStroke(Color.BLUE);
    root.getChildren().add(r);
    }
    }
    scene.setRoot(root);
    primaryStage.show();




    scene.addEventHandler(MouseEvent.MOUSE_CLICKED, (MouseEvent me) -> {
        if(me.getButton().equals(MouseButton.PRIMARY)) {
            Circle circle = new Circle(me.getX(), me.getY(), 10, Color.BLUE);
            addEventHandler(root, circle);
            root.getChildren().add(circle);
        }
    });}
    private void addEventHandler(Group parent, Node node) {
    // TODO Auto-generated method stub
         node.addEventHandler(MouseEvent.MOUSE_CLICKED, (MouseEvent me) -> {
                if(me.getButton().equals(MouseButton.SECONDARY)) {
                    parent.getChildren().remove(node);
                }
            });
}

如果我使用 scene.addEventHandler(MouseEvent.MOUSE_CLICKED, (MouseEvent me) 这段代码，那么我可以在任何地方随机添加圆圈(或球体)，甚至在网格线上单击。我只是想要为特定的矩形创建一个球体。

Answer 1

您可以将事件处理程序添加到各个 Rectangle 中，或者使用 MouseEvent 的 pickResult 属性来检查 >矩形被点击:

public static Rectangle getIntersectedRect(MouseEvent event) {
    Node n = event.getPickResult().getIntersectedNode();
    return (n instanceof Rectangle) ? (Rectangle) n : null;
}

scene.addEventHandler(MouseEvent.MOUSE_CLICKED, (MouseEvent me) -> {
    if(me.getButton().equals(MouseButton.PRIMARY)) {
        Rectangle rect = getIntersectedRect(me);
        if (rect != null) {
            Circle circle = new Circle(rect.getX()+35, rect.getY()+35, 10, Color.BLUE);
            addEventHandler(root, circle);
            root.getChildren().add(circle);
        }
    }
});}