如何在javafx场景中创建新对象？

时间：2014-07-14 08:08:02

标签： java javafx parent children scene

我似乎无法在场景中添加新对象。现在，当你点击绿色方块时，它运行方法选择，当你点击一个按钮时，它运行newcity方法，并且应该创建一个蓝色方块。我已经尝试将我的矩形添加到父级，但我总是得到错误。在下面的代码中，City Class中的getChildren（）用红色加下划线！

这是我的代码：
主类：

package application;

import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.stage.Stage;


public class Main extends Application {
    public void start(Stage primaryStage) {
        try {
            Parent root = FXMLLoader.load(getClass().getResource("/fxml/Map1.fxml"));
            Scene scene = new Scene(root,576,352);
            scene.getStylesheets().add(getClass().getResource("application.css").toExternalForm());
            primaryStage.setResizable(false);
            primaryStage.setScene(scene);
            primaryStage.setTitle("Map");
            primaryStage.show();
        } catch(Exception e) {
            e.printStackTrace();
        }
    }

    public static void main(String[] args) {
        launch(args);
    }
}

MainControl类：

package application;

import java.net.URL;
import java.util.ArrayList;
import java.util.ResourceBundle;

import javafx.event.ActionEvent;
import javafx.event.Event;
import javafx.fxml.Initializable;
import javafx.scene.Node;
import javafx.scene.shape.Rectangle;

public class MainControl implements Initializable {
    boolean selected = false;
    Node selectnode;
    public void initialize(URL arg0, ResourceBundle arg1) {
    };

    public void select(Event event) {
        selectnode = (Node) event.getSource();
        selected = true;
    }
    public void newcity(ActionEvent event){
        City ncity = new City();
        ncity.newcity(selectnode.getLayoutX(), selectnode.getLayoutY(),
                selectnode, event);
    }
}

城市类：

package application;

import javafx.event.ActionEvent;
import javafx.scene.Node;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.scene.shape.Rectangle;

public class City {
    public void newcity(double x,double y, Node n,ActionEvent event){

        Rectangle cityshape = new Rectangle(n.getLayoutX(), n.getLayoutY(),32, 32);
        Parent root = n.getParent();
        root.getChildren().add(cityshape); //getChildren() is underlined in red
    }
}

Map1 FXML：

    <?xml version="1.0" encoding="UTF-8"?>

    <?import javafx.scene.image.*?>
    <?import javafx.scene.*?>
    <?import javafx.scene.effect.*?>
    <?import javafx.scene.shape.*?>
    <?import javafx.scene.control.*?>
    <?import javafx.scene.text.*?>
    <?import java.lang.*?>
    <?import javafx.scene.layout.*?>

    <AnchorPane maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="352.0" prefWidth="576.0" xmlns="http://javafx.com/javafx/8" xmlns:fx="http://javafx.com/fxml/1" fx:controller="application.MainControl">
       <children>
  <TextField fx:id="textBox" layoutX="2.0" opacity="0.01" prefHeight="352.0" prefWidth="576.0" AnchorPane.bottomAnchor="0.0" AnchorPane.leftAnchor="0.0" AnchorPane.rightAnchor="0.0" AnchorPane.topAnchor="0.0">
     <cursor>
        <Cursor fx:constant="DEFAULT" />
     </cursor>
     <effect>
        <ColorAdjust />
     </effect>
  </TextField>
  <Rectangle fx:id="tile1" fill="#26b522" height="32.0" onMouseClicked="#movetest" stroke="BLACK" strokeType="INSIDE" width="32.0" />
  <Rectangle fx:id="tile20" fill="#26b522" height="32.0" layoutX="32.0" onMouseClicked="#movetest" stroke="BLACK" strokeType="INSIDE" width="32.0" />
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  <Rectangle fx:id="tile39" fill="#26b522" height="32.0" layoutX="96.0" layoutY="288.0" onMouseClicked="#movetest" stroke="BLACK" strokeType="INSIDE" width="32.0" />
  <Rectangle fx:id="tile29" fill="#26b522" height="32.0" layoutX="64.0" layoutY="288.0" onMouseClicked="#movetest" stroke="BLACK" strokeType="INSIDE" width="32.0" />
  <Rectangle fx:id="tile120" fill="#26b522" height="32.0" layoutX="32.0" layoutY="288.0" onMouseClicked="#movetest" stroke="BLACK" strokeType="INSIDE" width="32.0" />
  <Rectangle fx:id="tile19" fill="#26b522" height="32.0" layoutY="288.0" onMouseClicked="#movetest" stroke="BLACK" strokeType="INSIDE" width="32.0" />
  <Rectangle fx:id="r" arcHeight="15.0" arcWidth="15.0" fill="#ff1f1f" height="32.0" layoutX="256.0" layoutY="160.0" onMouseClicked="#move" stroke="BLACK" strokeType="INSIDE" width="32.0" />
  <Label layoutX="495.0" layoutY="6.0" prefHeight="17.0" prefWidth="60.0" text="Moves left:" />
  <Label fx:id="movelabel" layoutX="553.0" layoutY="6.0" prefHeight="17.0" prefWidth="21.0" />
  <Button mnemonicParsing="false" onAction="#newcity" text="Found City" />
       </children>
    </AnchorPane>

请帮助
感谢

2 个答案:

答案 0 :(得分：3)

我建议创建一个class City extends Rectangle 

import javafx.scene.Node;
import javafx.scene.paint.Paint;
import javafx.scene.shape.Rectangle;


public class City extends Rectangle {

    public City(final Node node) {
        super(node.getLayoutX(), node.getLayoutY(), 32, 32);
        this.setFill(Paint.valueOf("BLUE"));
    }

}

如果你想＆＃34;连接＆＃34;从 FXML-Controller类到 FXML-File 的方法，您必须在控制器中使用@FXML对其进行注释。< / p>

这里有一个例子给你：

import java.net.URL;
import java.util.ResourceBundle;
import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.fxml.Initializable;
import javafx.scene.Node;
import javafx.scene.input.MouseEvent;
import javafx.scene.layout.AnchorPane;

/**
 * FXML Controller class
 *
 * @author Patrick Ott <Patrick.Ott@professional-webworkx.de>
 */
public class MapController implements Initializable {

    @FXML
    AnchorPane main;

    /**
     * Initializes the controller class.
     *
     * @param url
     * @param rb
     */
    @Override
    public void initialize(URL url, ResourceBundle rb) {
        // do some initializing work here
    }

    @FXML
    public void movetest(MouseEvent event) {
        // your code for evaluating if move is possible..
        System.out.println("movetest()");
    }

    @FXML
    public void newcity(ActionEvent event) {
        // your code to create a new City
    }

    @FXML
    public void move(MouseEvent event) {
        Node node = (Node) event.getSource();
        City newCity = new City(node);
        main.getChildren().add(newCity);

    }
}

因为您的FXML是短的，并且您也没有发布完整信息，我已经使用了您添加到问题中的FXML文件，如下所示。

<?xml version="1.0" encoding="UTF-8"?>

<?import java.lang.*?>
<?import javafx.scene.control.*?>
<?import javafx.scene.effect.*?>
<?import javafx.scene.layout.*?>
<?import javafx.scene.shape.*?>

<AnchorPane fx:id="main" maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="352.0" prefWidth="576.0" xmlns="http://javafx.com/javafx/8" xmlns:fx="http://javafx.com/fxml/1" fx:controller="loadobject.MapController">
       <children>
  <TextField fx:id="textBox" layoutX="2.0" opacity="0.01" prefHeight="352.0" prefWidth="576.0" AnchorPane.bottomAnchor="0.0" AnchorPane.leftAnchor="0.0" AnchorPane.rightAnchor="0.0" AnchorPane.topAnchor="0.0">
     <effect>
        <ColorAdjust />
     </effect>
  </TextField>
  <Rectangle fx:id="tile1" fill="#26b522" height="32.0" onMouseClicked="#movetest" stroke="BLACK" strokeType="INSIDE" width="32.0" />
  <Rectangle fx:id="tile20" fill="#26b522" height="32.0" layoutX="32.0" onMouseClicked="#movetest" stroke="BLACK" strokeType="INSIDE" width="32.0" />
  <Rectangle fx:id="tile2" fill="#26b522" height="32.0" layoutX="64.0" onMouseClicked="#movetest" stroke="BLACK" strokeType="INSIDE" width="32.0" />
  <Rectangle fx:id="tile3" fill="#26b522" height="32.0" layoutX="96.0" onMouseClicked="#movetest" stroke="BLACK" strokeType="INSIDE" width="32.0" />
  <Rectangle fx:id="tile4" fill="#26b522" height="32.0" layoutX="128.0" onMouseClicked="#movetest" stroke="BLACK" strokeType="INSIDE" width="32.0" />
  <Rectangle fx:id="tile5" fill="#26b522" height="32.0" layoutX="160.0" onMouseClicked="#movetest" stroke="BLACK" strokeType="INSIDE" width="32.0" />
  <Rectangle fx:id="tile6" fill="#26b522" height="32.0" layoutX="192.0" onMouseClicked="#movetest" stroke="BLACK" strokeType="INSIDE" width="32.0" />
  <Rectangle fx:id="tile7" fill="#26b522" height="32.0" layoutX="224.0" onMouseClicked="#movetest" stroke="BLACK" strokeType="INSIDE" width="32.0" />
  <Rectangle fx:id="tile8" fill="#26b522" height="32.0" layoutX="256.0" onMouseClicked="#movetest" stroke="BLACK" strokeType="INSIDE" width="32.0" />
  <Rectangle fx:id="tile9" fill="#26b522" height="32.0" layoutX="288.0" onMouseClicked="#movetest" stroke="BLACK" strokeType="INSIDE" width="32.0" />
  <Rectangle fx:id="tile10" fill="#26b522" height="32.0" layoutX="320.0" onMouseClicked="#movetest" stroke="BLACK" strokeType="INSIDE" width="32.0" />
  <Rectangle fx:id="tile101" fill="#26b522" height="32.0" layoutX="320.0" layoutY="32.0" onMouseClicked="#movetest" stroke="BLACK" strokeType="INSIDE" width="32.0" />
  <Rectangle fx:id="tile91" fill="#26b522" height="32.0" layoutX="288.0" layoutY="32.0" onMouseClicked="#movetest" stroke="BLACK" strokeType="INSIDE" width="32.0" />
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  <Rectangle fx:id="tile71" fill="#26b522" height="32.0" layoutX="224.0" layoutY="32.0" onMouseClicked="#movetest" stroke="BLACK" strokeType="INSIDE" width="32.0" />
  <Rectangle fx:id="tile61" fill="#26b522" height="32.0" layoutX="192.0" layoutY="32.0" onMouseClicked="#movetest" stroke="BLACK" strokeType="INSIDE" width="32.0" />
  <Rectangle fx:id="tile51" fill="#26b522" height="32.0" layoutX="160.0" layoutY="32.0" onMouseClicked="#movetest" stroke="BLACK" strokeType="INSIDE" width="32.0" />
  <Rectangle fx:id="tile41" fill="#26b522" height="32.0" layoutX="128.0" layoutY="32.0" onMouseClicked="#movetest" stroke="BLACK" strokeType="INSIDE" width="32.0" />
  <Rectangle fx:id="tile31" fill="#26b522" height="32.0" layoutX="96.0" layoutY="32.0" onMouseClicked="#movetest" stroke="BLACK" strokeType="INSIDE" width="32.0" />
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  <Rectangle fx:id="tile30" fill="#26b522" height="32.0" layoutX="32.0" layoutY="32.0" onMouseClicked="#movetest" stroke="BLACK" strokeType="INSIDE" width="32.0" />
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  <Rectangle fx:id="tile104" fill="#26b522" height="32.0" layoutX="320.0" layoutY="128.0" onMouseClicked="#movetest" stroke="BLACK" strokeType="INSIDE" width="32.0" />
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  <Rectangle fx:id="tile89" fill="#26b522" height="32.0" layoutX="256.0" layoutY="288.0" onMouseClicked="#movetest" stroke="BLACK" strokeType="INSIDE" width="32.0" />
  <Rectangle fx:id="tile79" fill="#26b522" height="32.0" layoutX="224.0" layoutY="288.0" onMouseClicked="#movetest" stroke="BLACK" strokeType="INSIDE" width="32.0" />
  <Rectangle fx:id="tile69" fill="#26b522" height="32.0" layoutX="192.0" layoutY="288.0" onMouseClicked="#movetest" stroke="BLACK" strokeType="INSIDE" width="32.0" />
  <Rectangle fx:id="tile59" fill="#26b522" height="32.0" layoutX="160.0" layoutY="288.0" onMouseClicked="#movetest" stroke="BLACK" strokeType="INSIDE" width="32.0" />
  <Rectangle fx:id="tile49" fill="#26b522" height="32.0" layoutX="128.0" layoutY="288.0" onMouseClicked="#movetest" stroke="BLACK" strokeType="INSIDE" width="32.0" />
  <Rectangle fx:id="tile39" fill="#26b522" height="32.0" layoutX="96.0" layoutY="288.0" onMouseClicked="#movetest" stroke="BLACK" strokeType="INSIDE" width="32.0" />
  <Rectangle fx:id="tile29" fill="#26b522" height="32.0" layoutX="64.0" layoutY="288.0" onMouseClicked="#movetest" stroke="BLACK" strokeType="INSIDE" width="32.0" />
  <Rectangle fx:id="tile120" fill="#26b522" height="32.0" layoutX="32.0" layoutY="288.0" onMouseClicked="#movetest" stroke="BLACK" strokeType="INSIDE" width="32.0" />
  <Rectangle fx:id="tile19" fill="#26b522" height="32.0" layoutY="288.0" onMouseClicked="#movetest" stroke="BLACK" strokeType="INSIDE" width="32.0" />
  <Rectangle fx:id="r" arcHeight="15.0" arcWidth="15.0" fill="#ff1f1f" height="32.0" layoutX="256.0" layoutY="160.0" onMouseClicked="#move" stroke="BLACK" strokeType="INSIDE" width="32.0" />
  <Label layoutX="495.0" layoutY="6.0" prefHeight="17.0" prefWidth="60.0" text="Moves left:" />
  <Label fx:id="movelabel" layoutX="553.0" layoutY="6.0" prefHeight="17.0" prefWidth="21.0" />
  <Button layoutX="4.0" layoutY="6.0" mnemonicParsing="false" onAction="#newcity" text="Found City" />
       </children>
    </AnchorPane>

我希望它会对你有所帮助。如果事情不明确，请随意评论并询问;）

帕特里克

答案 1 :(得分：0)

JavaFX在幕后摆弄对象。我不知道你的确切错误，但我可以假设它是一个与变量selectnode相关的空指针异常。如果将此变量定义为public static，则可以静态引用它而不是传递它。这也应解决它未定义的问题。

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