解决方法
如果您保留了在绘制图像时使用的AffineTransform的副本,则可以使用
AffineTransform.inverseTransform(Point2D ptSrc,Point2D ptDst)
将设备空间坐标转换回用户空间
AffineTransform.inverseTransform(Point2D ptSrc,Point2D ptDst)
将设备空间坐标转换回用户空间
编辑:如果在绘制时捕获Graphics2D的当前变换,请注意Graphics2D被重用于同一窗口/面板的多个轻量级子项,因为那时变换将相对于父组件,但鼠标坐标将是相对于孩子.您需要捕获对变换所做的更改而不是其最终值.例:
import java.awt.BasicStroke; import java.awt.Color; import java.awt.Component; import java.awt.Dimension; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.Point; import java.awt.event.MouseAdapter; import java.awt.event.MouseEvent; import java.awt.event.MouseMotionAdapter; import java.awt.geom.AffineTransform; import java.awt.geom.NoninvertibleTransformException; import java.awt.image.BufferedImage; import java.io.IOException; import java.net.MalformedURLException; import java.net.URL; import javax.imageio.ImageIO; import javax.swing.Box; import javax.swing.BoxLayout; import javax.swing.JComponent; import javax.swing.JFrame; public class Main { public static void main(String[] args) throws MalformedURLException,IOException { JFrame frame = new JFrame(); Box Box = new Box(BoxLayout.Y_AXIS); BufferedImage image = ImageIO.read(new URL("http://sstatic.net/so/img/logo.png")); AffineTransform xfrm1 = AffineTransform.getScaleInstance(0.95,1.25); xfrm1.rotate(-0.3); Box.add(new ImageView(image,xfrm1)); AffineTransform xfrm2 = AffineTransform.getShearInstance(0.1,0.2); xfrm2.scale(1.3,0.9); Box.add(new ImageView(image,xfrm2)); frame.add(Box); frame.pack(); frame.setDefaultCloSEOperation(JFrame.EXIT_ON_CLOSE); frame.setVisible(true); } } @SuppressWarnings("serial") class ImageView extends JComponent { @Override public void paintComponent(Graphics g) { Graphics2D g2d = (Graphics2D) g; try { paintXfrm = g2d.getTransform(); paintXfrm.invert(); g2d.translate(getWidth() / 2,getHeight() / 2); g2d.transform(xfrm); g2d.translate(image.getWidth() * -0.5,image.getHeight() * -0.5); paintXfrm.concatenate(g2d.getTransform()); g2d.drawImage(image,this); } catch (NoninvertibleTransformException ex) { ex.printStackTrace(); } } @Override public Dimension getPreferredSize() { return new Dimension(image.getWidth() * 2,image.getHeight() * 2); } ImageView(final BufferedImage image,final AffineTransform xfrm) { this.canvas = image.createGraphics(); canvas.setColor(Color.BLACK); canvas.setStroke(new BasicStroke(3.0f)); this.image = image; this.xfrm = xfrm; addMouseListener(new MouseAdapter() { @Override public void mousePressed(MouseEvent e) { try { mouseDownCoord = e.getPoint(); paintXfrm.inverseTransform(mouseDownCoord,mouseDownCoord); } catch (NoninvertibleTransformException ex) { } } @Override public void mouseExited(MouseEvent e) { mouseDownCoord = null; } }); addMouseMotionListener(new MouseMotionAdapter() { @Override public void mouseDragged(MouseEvent e) { Point p = e.getPoint(); try { paintXfrm.inverseTransform(p,p); if (mouseDownCoord != null) { canvas.drawLine(mouseDownCoord.x,mouseDownCoord.y,p.x,p.y); for (Component sibling: getParent().getComponents()) { sibling.repaint(); } } mouseDownCoord = p; } catch (NoninvertibleTransformException ex) { ex.printStackTrace(); } } }); } private Graphics2D canvas; private BufferedImage image; private AffineTransform xfrm; private AffineTransform paintXfrm; private Point mouseDownCoord; }