在您將其標(biāo)記為重復(fù)之前我已經(jīng)在互聯(lián)網(wǎng)上進(jìn)行了大量搜索，并嘗試了每種解決方案，但是沒有人以與我相同的方式來做。在我的情況下，輪換是一門精打細(xì)算的課程。我創(chuàng)建了一個繼承JLabel類的Java類，在我的類中有一個BufferedImage使用該paintComponent(Graphics g)方法繪制的箭頭。我試圖使箭頭指向特定的點（我是從另一種方法獲得的），但是出了點問題，箭頭旋轉(zhuǎn)了錯誤的方向。我認(rèn)為：由于imageLocation是相對于標(biāo)簽的，因此計算不正確。這是我的代碼：package pkg1;import java.awt.*;import java.awt.event.*;import java.awt.image.*;import java.io.*;import javax.imageio.*;import javax.swing.*;public final class ImageLabel extends JLabel {   private float angle = 0.0f; // in radians   private Point imageLocation = new Point();   private File imageFile = null;   private Dimension imageSize = new Dimension(50, 50);   private BufferedImage bi;   private BufferedImage resizeImage(BufferedImage originalImage, int img_width, int img_height) {      int type = originalImage.getType() == 0 ? BufferedImage.TYPE_INT_ARGB : originalImage.getType();      BufferedImage resizedImage = new BufferedImage(img_width, img_height, type);      Graphics2D g = resizedImage.createGraphics();      g.drawImage(originalImage, 0, 0, img_width, img_height, null);      g.dispose();      return resizedImage;   }   @Override   public void paintComponent(Graphics g) {      super.paintComponent(g);      if (bi == null) {         return;      }      imageLocation = new Point(getWidth() / 2 - bi.getWidth() / 2, getHeight() / 2 - bi.getHeight() / 2);      Graphics2D g2 = (Graphics2D) g;      g2.rotate(angle, imageLocation.x + bi.getWidth() / 2, imageLocation.y + bi.getHeight() / 2);      g2.drawImage(bi, imageLocation.x, imageLocation.y, null);   }   public void rotateImage(float angle) { // rotate the image to specific angle      this.angle = (float) Math.toRadians(angle);      repaint();   }   public void pointImageToPoint(Point target) {      calculateAngle(target);      repaint();   }