Java：将图像放在一个形状上

Question

我一直致力于一个简单的Java游戏并且已经成功地使用了形状，但下一个重要的步骤是使用图像。我想知道是否有一种方法可以简单地将图像放在诸如矩形之类的形状上，这将使该过程更容易，并且不需要我重写我的大部分代码。

以下是我游戏的两个类别供参考：

名为“Flappy Bird”的第一堂课

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Rectangle;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.util.ArrayList;
import java.util.Random;

import javax.swing.JFrame;
import javax.swing.Timer;

public class FlappyBird implements ActionListener, MouseListener, KeyListener {

    public static FlappyBird flappyBird;    
    public final int WIDTH = 800, HEIGHT = 800;    
    public Renderer renderer;    
    public Rectangle bird;    
    public ArrayList<Rectangle> columns;    
    public int ticks, yMotion, score;    
    public boolean gameOver, started;
    public Random rand;

    public FlappyBird() {
        JFrame jframe = new JFrame();
        Timer timer = new Timer(20, this);
        renderer = new Renderer();
        rand = new Random();
        jframe.add(renderer);
        jframe.setTitle("Flappy Bird");
        jframe.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        jframe.setSize(WIDTH, HEIGHT);
        jframe.addMouseListener(this);
        jframe.addKeyListener(this);
        jframe.setResizable(false);
        jframe.setVisible(true);
        bird = new Rectangle(WIDTH / 2 - 10, HEIGHT / 2 - 10, 20, 20);
        columns = new ArrayList<Rectangle>();
        addColumn(true);
        addColumn(true);
        addColumn(true);
        addColumn(true);
        timer.start();
    }

    public void addColumn(boolean start) {
        int space = 300;
        int width = 100;
        int height = 50 + rand.nextInt(300);
        if (start) {
            columns.add(new Rectangle(WIDTH + width + columns.size() * 300, HEIGHT - height - 120, width, height));
            columns.add(new Rectangle(WIDTH + width + (columns.size() - 1) * 300, 0, width, HEIGHT - height - space));
        } else {
            columns.add(new Rectangle(columns.get(columns.size() - 1).x + 600, HEIGHT - height - 120, width, height));
            columns.add(new Rectangle(columns.get(columns.size() - 1).x, 0, width, HEIGHT - height - space));
        }
    }

    public void paintColumn(Graphics g, Rectangle column) {
        g.setColor(Color.green.darker());
        g.fillRect(column.x, column.y, column.width, column.height);
    }

    public void jump() {
        if (gameOver) {
            bird = new Rectangle(WIDTH / 2 - 10, HEIGHT / 2 - 10, 20, 20);
            columns.clear();
            yMotion = 0;
            score = 0;    
            addColumn(true);
            addColumn(true);
            addColumn(true);
            addColumn(true); 
            gameOver = false;
        }

        if (!started)
            started = true;
        else if (!gameOver)  {
            if (yMotion > 0)
                yMotion = 0;
            yMotion -= 10;
        }
    }

    @Override
    public void actionPerformed(ActionEvent e) {
        int speed = 10;    
        ticks++;    
        if (started) {
            for (int i = 0; i < columns.size(); i++) {
                Rectangle column = columns.get(i); 
                column.x -= speed;
            }    
            if (ticks % 2 == 0 && yMotion < 15)
                yMotion += 2;    
            for (int i = 0; i < columns.size(); i++) {
                Rectangle column = columns.get(i);
                if (column.x + column.width < 0) {
                    columns.remove(column);   
                    if (column.y == 0)
                        addColumn(false);
                }
            }    
            bird.y += yMotion;    
            for (Rectangle column : columns) {
                if (column.y == 0 && bird.x + bird.width / 2 > column.x + column.width / 2 - 10 && bird.x + bird.width / 2 < column.x + column.width / 2 + 10) {
                    score++;
                }    
                if (column.intersects(bird)) {
                    gameOver = true;    
                    if (bird.x <= column.x)
                        bird.x = column.x - bird.width;    
                    else
                        if (column.y != 0)
                            bird.y = column.y - bird.height;
                        else if (bird.y < column.height)
                            bird.y = column.height;
                }
            }   
            if (bird.y > HEIGHT - 120 || bird.y < 0)
                gameOver = true; 
            if (bird.y + yMotion >= HEIGHT - 120) {
                bird.y = HEIGHT - 120 - bird.height;
                gameOver = true;
            }
        }    
        renderer.repaint();
    }

    public void repaint(Graphics g) {
        g.setColor(Color.cyan);
        g.fillRect(0, 0, WIDTH, HEIGHT);    
        g.setColor(Color.orange);
        g.fillRect(0, HEIGHT - 120, WIDTH, 120); 
        g.setColor(Color.green);
        g.fillRect(0, HEIGHT - 120, WIDTH, 20);    
        g.setColor(Color.red);
        g.fillRect(bird.x, bird.y, bird.width, bird.height);   
        for (Rectangle column : columns)
            paintColumn(g, column);    
        g.setColor(Color.white);
        g.setFont(new Font("Arial", 1, 100));    
        if (!started)
            g.drawString("Click to start!", 75, HEIGHT / 2 - 50);    
        if (gameOver)
            g.drawString("Game Over!", 100, HEIGHT / 2 - 50);    
        if (!gameOver && started)
            g.drawString(String.valueOf(score), WIDTH / 2 - 25, 100);
    }

    public static void main(String[] args) {
        flappyBird = new FlappyBird();
    }

    @Override
    public void mouseClicked(MouseEvent e) {
        jump();
    }

    @Override
    public void keyReleased(KeyEvent e) {
        if (e.getKeyCode() == KeyEvent.VK_SPACE)
            jump();
    }

    @Override
    public void mousePressed(MouseEvent e){
    }

    @Override
    public void mouseReleased(MouseEvent e) {
    }

    @Override
    public void mouseEntered(MouseEvent e) {
    }

    @Override
    public void mouseExited(MouseEvent e){ 
    }

    @Override
    public void keyTyped(KeyEvent e) {
    }

    @Override
    public void keyPressed(KeyEvent e) {
    }

}

第二个名为“Renderer”的类：

import java.awt.Graphics;
import javax.swing.JPanel;

public class Renderer extends JPanel {
    private static final long serialVersionUID = 1L;

    @Override
    protected void paintComponent(Graphics g) {
        super.paintComponent(g);
        FlappyBird.flappyBird.repaint(g);
    }

}

我知道这是一个巨大的问题，我想非常感谢所有回复的人和这里的精彩社区： - ）