好的，所以在过去的 26 小时里，我一直试图通过指南和在线帮助来解决这个问题，但没有成功。
我想要做的就是在用户单击 PaintPanel 时画一个椭圆形请有人帮忙，这样我就可以睡觉了：P
在 PaintApplet 类中：
private void PaintPanelMouseClicked(java.awt.event.MouseEvent evt) {
// TODO add your handling code here:
if(FillRadioButton.isSelected())
{
PaintPanel.setBackground(JColor.getColor());
PaintPanel.repaint();
}
if(BrushRadioButton.isSelected())
{
Point ComponentPoint = PaintPanel.getLocationOnScreen();
PaintPanel.add(new Painter(ComponentPoint));
}
}
画家班：
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import javax.swing.JFrame;
import javax.swing.JPanel;
import java.awt.*;
public class Painter extends JPanel{
Point Component;
public Painter(Point Com)
{
Component = Com;
}
public void paintComponent(Graphics g)
{
super.paint(g);
Point CursorPoint= MouseInfo.getPointerInfo().getLocation(); //gets cursorpoint
int ComPX = Component.x;
int ComPY = Component.y;
int CurPX = CursorPoint.x;
int CurPY = CursorPoint.y;
int FinalX = CurPX - ComPX;
int FinalY = CurPY - ComPY;
g.drawOval(FinalX, FinalY, 20, 20);
}
}