Comment créer un nouvel objet dans une scène javafx?

Je n'arrive pas à ajouter un nouvel objet à ma scène. En ce moment j'ai quand vous cliquez sur un carré vert, il exécute la méthode sélectionner et quand vous cliquez sur un bouton, il exécute la méthode newcity et est censé créer un carré bleu. J'ai essayé d'ajouter mon rectangle au parent mais j'ai toujours des erreurs. Dans le code ci-dessous, getChildren() dans la classe City est souligné en rouge!Comment créer un nouvel objet dans une scène javafx?

Voici mon code:
Classe principale:

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 Classe:

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); 
    } 
}

Ville Classe:

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 
    } 
}

carte1 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="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" /> 
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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>

S'il vous plaît aider
Merci

Source

2014-07-14 sazzy4o

Veuillez éditer votre question et ajoutez-y votre FXML. – Patrick

Je l'ai raccourci et ajouté. Je pense que la version abrégée devrait fonctionner comme l'autre. Merci – sazzy4o

Je suggère de créer un class City qui 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")); 
    } 

}

Si vous voulez « connecter » Méthodes de votre classe FXML-Controller au FXML-File, vous devez les annoter avec @FXML dans votre Contrôleur.

Ici, j'ai un exemple pour vous:

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 <[email protected]> 
*/ 
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); 

    } 
}

Parce que votre FXML est et vous aussi raccourci dans ne pas publier vos i travaillé sur le FXML-fichier que vous avez ajouté à votre question, ce qui suit ci-dessous.

<?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" /> 
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    <Rectangle fx:id="tile18" fill="#26b522" height="32.0" layoutY="256.0" onMouseClicked="#movetest" stroke="BLACK" strokeType="INSIDE" width="32.0" /> 
    <Rectangle fx:id="tile109" fill="#26b522" height="32.0" layoutX="320.0" layoutY="288.0" onMouseClicked="#movetest" stroke="BLACK" strokeType="INSIDE" width="32.0" /> 
    <Rectangle fx:id="tile99" fill="#26b522" height="32.0" layoutX="288.0" layoutY="288.0" onMouseClicked="#movetest" stroke="BLACK" strokeType="INSIDE" width="32.0" /> 
    <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>

J'espère que cela va vous aider. Si quelque chose ne va pas, n'hésitez pas à commenter et à demander;)

Patrick

Source

2014-07-14 10:55:14 Patrick

Vous utilisez java 8 jre 1.6 droit? – sazzy4o

Droit! J'utilise JDK 1.8 – Patrick

Vous avez copié et collé mon exemple de fichier FXML? Si oui, jetez un œil à l'attribut 'fx: controller =" ... "' et ajoutez le bon package et le nom du contrôleur. – Patrick

JavaFX tripote autour des objets dans les coulisses. Je ne connais pas votre erreur exacte mais je peux supposer qu'il s'agit d'une exception de pointeur null relative à la variable selectnode. Si vous définissez cette variable comme statique publique, vous pouvez la référencer statiquement au lieu de la transmettre. Cela devrait également résoudre le problème de devenir indéfini.

Source

2014-07-14 08:21:22

Il ne laissera pas s'exécuter getChildren() – sazzy4o

Comment créer un nouvel objet dans une scène javafx?

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