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java - 如何删除白色背景以及如何添加棍子？

问题描述

我正在尝试为我的项目创建台球游戏，但我很难同时添加棒和球。此外，当我添加球时，JFrame 的背景变为白色，它实际上应该是绿色（表格的颜色）。

您的帮助将不胜感激。

我尝试使用Graphics. 例如g2d.setBackground(Color.green). 哪个没用

public class Practice_Window implements MouseListener, MouseMotionListener, KeyListener {

    JFrame Practice_Mode = new JFrame(); 
    Balls myBalls = new Balls(); 
    Stick myStick = new Stick(); 

    public void PracticeWindow()
    {

        Practice_Mode.setSize(1000, 500);
        Practice_Mode.setVisible(true); 
        Practice_Mode.setResizable(false);
        Practice_Mode.setTitle("Practice Mode");
        Practice_Mode.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        Practice_Mode.getContentPane().setBackground(new Color(0, 1, 0, 0.5f)); //Not visible after i add my balls
        Practice_Mode.getRootPane().setBorder(BorderFactory.createMatteBorder(10, 10, 10, 10, Color.GREEN));

        Practice_Mode.add(myBalls);
        //Practice_Mode.add(myStick); 

        //JPanel p = new JPanel();

        //Timer t= new Timer(10, myBalls); 


    }

//BALL CLASS
public class Balls extends JPanel implements ActionListener
{
    double Size = 35;

    double REDxSpeed = 5; 
    double REDySpeed = 5;
    double REDSpeed = 0;


    double YELLOWxSpeed = 2; 
    double YELLOWySpeed = 3; 
    double YELLOWSpeed = 0;


    double WHITExSpeed = 4; 
    double WHITEySpeed = 2; 
    double WHITESpeed = 0;

    double friction = 0.2; 

    boolean Collision = false; 

    Ellipse2D.Double red = new Ellipse2D.Double(200, 200, Size, Size);
    Ellipse2D.Double yellow = new Ellipse2D.Double(300, 300, Size, Size); 
    Ellipse2D.Double white = new Ellipse2D.Double(150, 400, Size, Size);

    Timer t = new Timer(10, this); 


    Balls()
    {
        t.start(); 
    }

    @Override
    public void actionPerformed(ActionEvent e) //Things are moving here
    {

        //RED BALL
        red.x += REDxSpeed; 
        red.y += REDySpeed; 
        REDSpeed = Math.sqrt(REDxSpeed*REDxSpeed + REDySpeed*REDySpeed); 

        repaint(); 

        if(red.x < 0 || red.x > getWidth() - red.width)
        {
            REDxSpeed = -REDxSpeed; 
        }

        if(red.y < 0 || red.y > getHeight() - red.height)
        {
            REDySpeed = -REDySpeed; 
        }

        //YELLOW BALL
        yellow.x += YELLOWxSpeed; 
        yellow.y += YELLOWySpeed; 
        YELLOWSpeed = Math.sqrt(YELLOWxSpeed*YELLOWxSpeed + YELLOWySpeed*YELLOWySpeed); 

        repaint(); 

        if(yellow.x < 0 || yellow.x > getWidth() - yellow.width)
        {
            YELLOWxSpeed = -YELLOWxSpeed; 
        }

        if(yellow.y < 0 || yellow.y > getHeight() - yellow.height)
        {
            YELLOWySpeed = -YELLOWySpeed; 
        }

        //WHITE BALL
        white.x += WHITExSpeed; 
        white.y += WHITEySpeed; 
        WHITESpeed = Math.sqrt(WHITExSpeed*WHITExSpeed + WHITESpeed*WHITEySpeed);
        repaint(); 

        if(white.x < 0 || white.x > getWidth() - white.width)
        {
            WHITExSpeed = -WHITExSpeed; 
        }

        if(white.y < 0 || white.y > getHeight() - white.height)
        {
            WHITEySpeed = -WHITEySpeed; 
        }
        Collision_Detection(); 
    }

    public void paintComponent(Graphics g) //DRAWING MY BALLS
    {
        super.paintComponent(g);
        Graphics2D g2d = (Graphics2D)g; 
        //g2d.setBackground(Color.green);

        g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
        g2d.setColor(Color.red);
        g2d.fill(red);

        g2d.setColor(Color.yellow);
        g2d.fill(yellow);

        g2d.setColor(Color.black);
        g2d.fill(white);
    }

//STICK CLASS
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.MouseMotionListener;
import java.awt.geom.Rectangle2D;

import javax.swing.*; 

public class Stick extends JPanel implements MouseListener, MouseMotionListener, ActionListener {
    int xLocation = 50; 
    int yLocation = 50; 
    int Width = 50;  
    int Height = 15;

    Rectangle2D.Double stick = new Rectangle2D.Double(200, 200, Width, Height); 

    Timer t = new Timer(10, this); 

    Stick()
    {
        t.start();
    }

    public void PaintComponent(Graphics g)
    {
        super.paintComponent(g); 
        Graphics2D g2d = (Graphics2D)g; 

        g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);


        g2d.setColor(Color.ORANGE);
        g2d.fill(stick);

    }

标签： javaswingbilliards

解决方案

我很难同时添加棍子和球。

那么，您为什么要在不进行任何测试的情况下一次编写整个应用程序呢？为什么你的代码中有定时器？为什么你有 KeyListeners？

学习一步一步地开发应用程序。写一点代码做一些测试。当它工作时添加更多功能。在添加更复杂的逻辑之前先获得基本的权利。

Practice_Mode.add(myBalls);
//Practice_Mode.add(myStick);

JFrame 的默认布局管理器是 BorderLayout。默认情况下，当您将组件添加到框架（并且不指定约束）时，组件会转到 CENTER。只能将单个组件添加到 CENTER，因此只有最后添加的组件可见。

你的基本设计是错误的。您不想为球和棍子设置单独的面板。您想要一个可以绘制多个对象的“BilliardsGameBoard”面板。所以这个面板将绘制所有的球和棍子。这样，所有对象都由同一个类管理。

您也不应该使用变量名创建单个对象。这限制了您可以控制的对象数量。相反，将要绘制的对象保留在 ArrayList 中，然后绘制方法遍历 ArrayList 并绘制每个对象。

请参阅：在类之外获取 JPanel 的宽度和高度，以获取此方法的工作示例。

我添加了JFrame的背景变白的球，

Practice_Mode.getContentPane().setBackground(new Color(0, 1, 0, 0.5f));

指定颜色时不要使用 alpha 值。对于绿色，您可以使用：

practiceMode.getContentPane().setBackground( Color.GREEN );

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