JavaSwing游戏开发之Camera原理

import javax.swing.*;

import java.awt.*;

public class CameraExample extends JPanel {

    private static final long serialVersionUID = 1L;

    private int xOffset = 0;

    public CameraExample() {

        // 使用双缓冲技术避免闪烁

        super(true);

    }

    @Override

    protected void paintComponent(Graphics g) {

        super.paintComponent(g);

        doDrawing(g);

    }

    private void doDrawing(Graphics g) {

        Graphics2D g2d = (Graphics2D) g;

        // 绘制背景

        g2d.setColor(Color.WHITE);

        g2d.fillRect(0, 0, 640, 480);

        // 绘制实体

        g2d.setColor(Color.BLUE);

        g2d.fillRect(200 + xOffset, 100, 20, 20);

        // 绘制Camera边界

        g2d.setColor(Color.RED);

        g2d.drawRect(100 + xOffset, 50, 200, 200);

    }

    public void moveCamera(int x) {

        xOffset = x;

        repaint();

    }

    public static void main(String[] args) {

        JFrame frame = new JFrame("Camera Example");

        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        frame.add(new CameraExample());

        frame.setSize(640, 480);

        frame.setVisible(true);

        // 模拟移动Camera

        CameraExample cameraExample = (CameraExample) frame.getContentPane().getComponent(0);

        for (int i = -100; i < 100; i++) {

            cameraExample.moveCamera(i);

            try {

                Thread.sleep(100);

            } catch (InterruptedException e) {

                e.printStackTrace();

            }

        }

    }

}

这段代码演示了如何在Java Swing中实现一个简单的Camera效果。它创建了一个CameraExample类，继承自JPanel，并重写了paintComponent方法来绘制屏幕上的对象。moveCamera方法用于移动Camera并重绘组件。在主方法中，我们创建了一个JFrame，添加了CameraExample的实例，并模拟了Camera的移动。

原文地址：https://blog.csdn.net/Rverdoser/article/details/145210959

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