用Java代码编写一个程序实现一下功能 1）从已有的图象文件列表中选择某一个，即可显示该图象，并可做旋转等变换。 2）在画布区域上可以进行各种规则图形的绘制（如：线段、矩形、多边形、圆等），还可通过鼠标的拖动自由绘图。 3）可以连续播放所选文件夹下的所有图象。

好的，以下是使用Java代码实现功能的示例：

1. 显示并旋转图像

import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.geom.AffineTransform;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;
import javax.swing.JFrame;
import javax.swing.JPanel;

public class ImageDisplay extends JPanel {
  private Image image;
  private double angle = 0;

  public ImageDisplay(String imagePath) throws IOException {
    image = ImageIO.read(new File(imagePath));
  }

  public void rotate(double angle) {
    this.angle += angle;
    repaint();
  }

  @Override
  protected void paintComponent(Graphics g) {
    super.paintComponent(g);
    Graphics2D g2d = (Graphics2D) g;
    AffineTransform transform = new AffineTransform();
    transform.translate(getWidth() / 2, getHeight() / 2);
    transform.rotate(Math.toRadians(angle), 0, 0);
    transform.translate(-image.getWidth(null) / 2, -image.getHeight(null) / 2);
    g2d.drawImage(image, transform, null);
  }

  public static void main(String[] args) throws IOException {
    JFrame frame = new JFrame("Image Display");
    ImageDisplay panel = new ImageDisplay("image.jpg");
    frame.add(panel);
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setSize(400, 400);
    frame.setVisible(true);
    panel.rotate(45); // 旋转45度
  }
}

2. 绘制图形

import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Point;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.util.ArrayList;
import javax.swing.JFrame;
import javax.swing.JPanel;

public class ShapeDrawer extends JPanel {
  private ArrayList<Point> points = new ArrayList<Point>();
  private ArrayList<Shape> shapes = new ArrayList<Shape>();
  private Shape currentShape = null;

  public ShapeDrawer() {
    addMouseListener(new MouseAdapter() {
      @Override
      public void mousePressed(MouseEvent e) {
        points.add(e.getPoint());
        repaint();
      }

      @Override
      public void mouseReleased(MouseEvent e) {
        if (currentShape != null) {
          shapes.add(currentShape);
          currentShape = null;
        }
        points.clear();
        repaint();
      }
    });

    addMouseMotionListener(new MouseAdapter() {
      @Override
      public void mouseDragged(MouseEvent e) {
        if (points.size() > 0) {
          Point lastPoint = points.get(points.size() - 1);
          currentShape = new Line(lastPoint, e.getPoint());
          repaint();
        }
      }
    });
  }

  @Override
  protected void paintComponent(Graphics g) {
    super.paintComponent(g);
    Graphics2D g2d = (Graphics2D) g;
    for (Shape shape : shapes) {
      shape.draw(g2d);
    }
    if (currentShape != null) {
      currentShape.draw(g2d);
    }
  }

  private abstract class Shape {
    public abstract void draw(Graphics2D g);
  }

  private class Line extends Shape {
    private Point start;
    private Point end;

    public Line(Point start, Point end) {
      this.start = start;
      this.end = end;
    }

    @Override
    public void draw(Graphics2D g) {
      g.drawLine(start.x, start.y, end.x, end.y);
    }
  }

  public static void main(String[] args) {
    JFrame frame = new JFrame("Shape Drawer");
    ShapeDrawer panel = new ShapeDrawer();
    frame.add(panel);
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setSize(400, 400);
    frame.setVisible(true);
  }
}

3. 连续播放图像

import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.geom.AffineTransform;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.Timer;

public class ImagePlayer extends JPanel {
  private Image[] images;
  private int currentIndex = 0;
  private double angle = 0;

  public ImagePlayer(String folderPath) throws IOException {
    File folder = new File(folderPath);
    File[] imageFiles = folder.listFiles((dir, name) -> name.endsWith(".jpg"));
    images = new Image[imageFiles.length];
    for (int i = 0; i < imageFiles.length; i++) {
      images[i] = ImageIO.read(imageFiles[i]);
    }
    Timer timer = new Timer(1000, e -> {
      currentIndex = (currentIndex + 1) % images.length;
      repaint();
    });
    timer.start();
  }

  public void rotate(double angle) {
    this.angle += angle;
    repaint();
  }

  @Override
  protected void paintComponent(Graphics g) {
    super.paintComponent(g);
    Graphics2D g2d = (Graphics2D) g;
    Image image = images[currentIndex];
    AffineTransform transform = new AffineTransform();
    transform.translate(getWidth() / 2, getHeight() / 2);
    transform.rotate(Math.toRadians(angle), 0, 0);
    transform.translate(-image.getWidth(null) / 2, -image.getHeight(null) / 2);
    g2d.drawImage(image, transform, null);
  }

  public static void main(String[] args) throws IOException {
    JFrame frame = new JFrame("Image Player");
    ImagePlayer panel = new ImagePlayer("images");
    frame.add(panel);
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setSize(400, 400);
    frame.setVisible(true);
    panel.rotate(45); // 旋转45度
  }
}