如何在javafx场景中创建新对象？
[英]How do you create a new object in a javafx scene?
问题描述
I cannot seem to add a new object to my scene. 
我似乎无法在场景中添加新对象。 Right now i have when you click on a green square it runs the method select and when you click on a button it runs the newcity method and is supposed to create a blue square. 现在，当您单击绿色正方形时，它会运行select方法；当您单击按钮时，它将运行newcity方法，并应该创建一个蓝色正方形。 I have tried adding my rectangle to the parent but i always get errors. 我尝试将矩形添加到父级中，但总是出错。 In the code below getChildren() in the City Class is underlined in red! 在下面的代码中，City Class中的getChildren（）用红色下划线！
Here is my code: 这是我的代码：
Main Class: 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 Class: MainControl类别：
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);
}
}
City Class: 城市等级：
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: 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="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>
Please help 请帮忙
Thanks 谢谢
2 个解决方案
解决方案1
3 已采纳 2014-07-14 10:55:14
I would suggest to create a class City which extends Rectangle 我建议创建一个extends Rectangle的class City
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"));
}
}
If you want to "connect" Methods from your FXML-Controller class to the FXML-File , you have to annotate them with @FXML in your Controller . 如果要将方法从FXML-Controller类 “连接”到FXML-File ，则必须在Controller中用@FXML进行注释。
Here i have an example for you: 这里我有一个例子供您参考：
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);
}
}
Because your FXML is shortend and you also didn't post you full i worked on the FXML-File you added to your Question, which follows below. 因为您的FXML缩短了，并且您也没有完整地发布，所以我处理了添加到问题中的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" />
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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>
I hope it will help you. 希望对您有帮助。 If something is not clear, feel free to comment and ask ;) 如果不清楚，请随时发表评论并询问;）
Patrick 帕特里克
解决方案2
0 2014-07-14 08:21:22
JavaFX fiddles around with objects behind the scenes. JavaFX在幕后摆弄对象。 I do not know your exact error but I can assume that it is a null pointer exception relating to the variable selectnode. 我不知道您的确切错误，但我可以假定这是与变量selectnode有关的空指针异常。 If you define this variable as public static then you can reference it statically instead of passing it. 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。 This should also resolve the issue of it becoming undefined. 这也应该解决它变得不确定的问题。
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