不要使用getGraphics，这不是自定义绘画的工作方式，有关更多详细信息，请参见“AWT中的绘画”和“摇摆和执行自定义绘画 ”
基本思想是，您需要某种List，您可以在其中添加每个形状。mouseClicked发生这种情况时，您遍历列表并检查单击的鼠标是否出现了其中一种形状，如果是，则将其从中删除List，如果没有，则在单击时创建一个新形状并添加它到List。
然后，您可以List在paintComponent方法内部使用它来物理绘制形状。
import java.awt.Color;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.Shape;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.geom.Ellipse2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import javax.imageio.ImageIO;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
public class Test {
public static void main(String[] args) {
new test();
}
public test() {
EventQueue.invokelater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | illegalaccessexception | UnsupportedLookAndFeelException ex) {
ex.printStackTrace();
}
JFrame frame = new JFrame("Testing");
frame.setDefaultCloSEOperation(JFrame.EXIT_ON_CLOSE);
frame.add(new DrawPane("/Volumes/Disk02/Drop@R_417_2419@/MegaTokyo/thumnails/0.jpg"));
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class ImagePanel extends JPanel {
private Image img;
public ImagePanel(String img, String str) {
//this(new ImageIcon(img).getImage());
}
public ImagePanel(String path) {
Image img = new ImageIcon(path).getImage();
this.img = img;
try {
BufferedImage image = ImageIO.read(new File(path));
int rgb = image.getRGB(66, 52);
System.out.println("Colour is: " + rgb);
} catch (IOException e) {
e.printStackTrace();
}
}
@Override
public Dimension getPreferredSize() {
return img == null ? new Dimension(200, 200) : new Dimension(img.getWidth(this), img.getHeight(this));
}
@Override
public void paintComponent(Graphics g) {
super.paintComponent(g);
g.drawImage(img, 0, 0, null);
}
}
public class DrawPane extends ImagePanel {
private List<Shape> shapes;
public DrawPane(String img, String str) {
super(img, str);
init();
}
public DrawPane(String path) {
super(path);
init();
}
protected void init() {
shapes = new ArrayList<>(25);
addMouseListener(new MouseAdapter() {
@Override
public void mouseClicked(MouseEvent e) {
boolean clicked = false;
Iterator<Shape> it = shapes.iterator();
while (it.hasNext()) {
Shape shape = it.next();
if (shape.contains(e.getPoint())) {
it.remove();
clicked = true;
break;
}
}
if (!clicked) {
shapes.add(new Ellipse2D.Double(e.getX() - 10, e.getY() - 10, 20, 20));
}
repaint();
}
});
}
@Override
public void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2d = (Graphics2D) g.create();
g2d.setColor(Color.RED);
for (Shape shape : shapes) {
g2d.draw(shape);
}
g2d.dispose();
}
}
}
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