在javaFX中的gridPane单元内随机显示圆圈

在javaFX中的gridPane单元内随机显示圆圈

这是一个示例，演示了如何

Circles

在

GridPane

。如果添加了

Circles

一个

ArrayList

，你可以删除

Circles

从

GridPane

。然后，您可以随机播放

List

。最后，您可以将混洗的列表添加回

GridPane

。

import java.util.ArrayList;import java.util.Collections;import java.util.List;import java.util.Random;import javafx.application.Application;import javafx.event.ActionEvent;import javafx.geometry.Insets;import javafx.scene.Scene;import javafx.scene.control.Button;import javafx.scene.control.Control;import javafx.scene.layout.GridPane;import javafx.scene.layout.StackPane;import javafx.scene.layout.VBox;import javafx.scene.paint.Color;import javafx.scene.shape.Circle;import javafx.stage.Stage;public class JavaFXApplication314 extends Application{    Random random = new Random();    int numberOfRows = 25;    int numberOfColumns = 25;    @Override    public void start(Stage primaryStage)    {        List<Circle> circles = new ArrayList();        for (int i = 0; i < numberOfColumns * numberOfRows; i++) { circles.add(new Circle(10, getRandomColor()));        }        GridPane gridPane = new GridPane();        addCirclesToGridPane(gridPane, circles);        gridPane.setPadding(new Insets(20, 20, 20, 20));        Button btn = new Button();        btn.setText("Say 'Hello World'");        btn.setonAction((ActionEvent event) -> { Collections.shuffle(circles);//Shuffle the List of Circles. for(int i = 0; i < numberOfColumns * numberOfRows; i++)  {      Circle c = circles.get(i);      GridPane.setColumnIndex(c, i % numberOfColumns);      GridPane.setRowIndex(c, i / numberOfColumns);  }        });        VBox vBox = new VBox(gridPane, new StackPane(btn));        vBox.setMaxSize(Control.USE_COMPUTED_SIZE, Control.USE_COMPUTED_SIZE);        StackPane root = new StackPane(vBox);        root.setMaxSize(Double.MAX_VALUE, Double.MAX_VALUE);        Scene scene = new Scene(root);        primaryStage.setTitle("Hello World!");        primaryStage.setScene(scene);        primaryStage.show();    }        public static void main(String[] args)    {        launch(args);    }    public void addCirclesToGridPane(GridPane gridPane, List<Circle> circles)    {        for (int i = 0; i < numberOfColumns * numberOfRows; i++) { gridPane.add(circles.get(i), i % numberOfColumns, i / numberOfColumns);        }    }    public Color getRandomColor()    {        int r = random.nextInt(255);        int g = random.nextInt(255);        int b = random.nextInt(255);        return Color.rgb(r, g, b);    }}