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如何在javafx場景中創建新對象？

2014-07-14 42 views
2

我似乎無法添加一個新的對象到我的場景。現在，當我點擊一個綠色方塊時，它會運行方法選擇，當你點擊一個按鈕時，它會運行newcity方法，並且應該創建一個藍色方塊。我曾嘗試將矩形添加到父項，但我總是遇到錯誤。在下面的代碼中，City Class中的getChildren（）以紅色下劃線！如何在javafx場景中創建新對象？

這裏是我的代碼：
主類：

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類：

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); 
    } 
}

城市類別：

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 
    } 
}

地圖1 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" /> 
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    <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 mnemonicParsing="false" onAction="#newcity" text="Found City" /> 
     </children> 
    </AnchorPane>

請幫
感謝

來源

2014-07-14 sazzy4o

+0

請編輯您的問題並添加您的FXML。 – Patrick

+0

我縮短了它並添加了它。我認爲縮短的版本應該作爲另一個。謝謝 – sazzy4o

回答

3

我建議建立一個class City其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「連接」從FXML-Controller類方法的FXML-文件，你有註釋他們@FXML在您的控制器。

在這裏，我有一個例子給你：

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 <[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); 

    } 
}

因爲你FXML是shortend，你也沒有張貼你充滿我的工作，你添加到您的問題，下面跟隨的FXML-文件。

<?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" /> 
    <Rectangle fx:id="tile81" fill="#26b522" height="32.0" layoutX="256.0" layoutY="32.0" onMouseClicked="#movetest" stroke="BLACK" strokeType="INSIDE" width="32.0" /> 
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    <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" /> 
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    <Rectangle fx:id="tile73" fill="#26b522" height="32.0" layoutX="224.0" layoutY="96.0" onMouseClicked="#movetest" stroke="BLACK" strokeType="INSIDE" width="32.0" /> 
    <Rectangle fx:id="tile63" fill="#26b522" height="32.0" layoutX="192.0" layoutY="96.0" onMouseClicked="#movetest" stroke="BLACK" strokeType="INSIDE" width="32.0" /> 
    <Rectangle fx:id="tile53" fill="#26b522" height="32.0" layoutX="160.0" layoutY="96.0" onMouseClicked="#movetest" stroke="BLACK" strokeType="INSIDE" width="32.0" /> 
    <Rectangle fx:id="tile43" fill="#26b522" height="32.0" layoutX="128.0" layoutY="96.0" onMouseClicked="#movetest" stroke="BLACK" strokeType="INSIDE" width="32.0" /> 
    <Rectangle fx:id="tile33" fill="#26b522" height="32.0" layoutX="96.0" layoutY="96.0" onMouseClicked="#movetest" stroke="BLACK" strokeType="INSIDE" width="32.0" /> 
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    <Rectangle fx:id="tile50" fill="#26b522" height="32.0" layoutX="32.0" layoutY="96.0" onMouseClicked="#movetest" stroke="BLACK" strokeType="INSIDE" width="32.0" /> 
    <Rectangle fx:id="tile13" fill="#26b522" height="32.0" layoutY="96.0" onMouseClicked="#movetest" stroke="BLACK" strokeType="INSIDE" width="32.0" /> 
    <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="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>

我希望它能幫助你。如果有什麼不清楚的地方，請隨時發表評論並提問;）

Patrick

來源

2014-07-14 10:55:14 Patrick

+0

你使用的是Java 8 jre 1.6嗎？ – sazzy4o

+0

對！我正在使用JDK 1.8 – Patrick

+1

您複製並粘貼了我的示例FXML文件？如果是，請查看'fx：controller =「...」'屬性並在其中添加正確的包和控制器名稱。 – Patrick

0

JavaFX的撥弄與周圍的幕後對象。我不知道你確切的錯誤，但我可以假設它是一個與變量selectnode有關的空指針異常。如果將此變量定義爲公共靜態，則可以靜態引用它，而不是傳遞它。這也應該解決它變得未定義的問題。

來源

2014-07-14 08:21:22

+0

它不會讓exicuted getChildren（） – sazzy4o

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