Question

我对重绘方法有问题。如果我只是制作面板并绘制，效果很好。 IMAGE 1

但是，如果我用East面板制作JFrame并向其中添加按钮，并从另一个必须单击和绘制对象的类中制作一个面板，则当我重新痛苦时，它会重新绘制JFrame的按钮，而我只想重新绘制那些我画。

JFrame的代码：

package drawing;

import java.awt.BorderLayout;
import java.awt.EventQueue;

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;
import javax.swing.JButton;
import javax.swing.GroupLayout;
import javax.swing.GroupLayout.Alignment;
import javax.swing.border.SoftBevelBorder;
import javax.swing.border.BevelBorder;
import javax.swing.border.LineBorder;
import java.awt.Color;
import javax.swing.border.MatteBorder;

public class DrawingFrm extends JFrame {

    private JPanel contentPane;

    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                try {
                    DrawingFrm frame = new DrawingFrm();
                    frame.setVisible(true);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });
    }

    public DrawingFrm() {
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setBounds(100, 100, 682, 422);
        contentPane = new JPanel();
        contentPane.setBorder(new EmptyBorder(0, 0, 0, 0));
        setContentPane(contentPane);


        contentPane.setLayout(new BorderLayout(0, 0));


        PnlDrawing pnldrawing  = new PnlDrawing();
        pnldrawing.setBorder(null);
        contentPane.add(pnldrawing, BorderLayout.CENTER);
        GroupLayout gl_pnldrawing = new GroupLayout(pnldrawing);
        gl_pnldrawing.setHorizontalGroup(
            gl_pnldrawing.createParallelGroup(Alignment.LEADING)
                .addGap(0, 577, Short.MAX_VALUE)
        );
        gl_pnldrawing.setVerticalGroup(
            gl_pnldrawing.createParallelGroup(Alignment.LEADING)
                .addGap(0, 357, Short.MAX_VALUE)
        );
        pnldrawing.setLayout(gl_pnldrawing);

        JPanel pnlLevo = new JPanel();
        pnlLevo.setBorder(null);
        contentPane.add(pnlLevo, BorderLayout.WEST);

        JButton btnPoint = new JButton("Point");

        JButton btnLine = new JButton("Line");

        JButton btnRectangle = new JButton("Rectangle");

        JButton btnCircle = new JButton("Circle");

        JButton btnDonut = new JButton("Donut");

        JButton btnModify = new JButton("Modify");

        JButton btnDelete = new JButton("Delete");

        GroupLayout gl_pnlLevo = new GroupLayout(pnlLevo);

        gl_pnlLevo.setHorizontalGroup(
            gl_pnlLevo.createParallelGroup(Alignment.LEADING)
                .addGroup(gl_pnlLevo.createSequentialGroup()
                    .addContainerGap()
                    .addGroup(gl_pnlLevo.createParallelGroup(Alignment.LEADING)
                        .addComponent(btnRectangle, GroupLayout.DEFAULT_SIZE, GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                        .addComponent(btnPoint, GroupLayout.DEFAULT_SIZE, 97, Short.MAX_VALUE)
                        .addComponent(btnLine, GroupLayout.DEFAULT_SIZE, 97, Short.MAX_VALUE)
                        .addComponent(btnCircle, GroupLayout.DEFAULT_SIZE, 97, Short.MAX_VALUE)
                        .addComponent(btnDonut, GroupLayout.DEFAULT_SIZE, 97, Short.MAX_VALUE)
                        .addComponent(btnModify, GroupLayout.DEFAULT_SIZE, 97, Short.MAX_VALUE)
                        .addComponent(btnDelete, GroupLayout.DEFAULT_SIZE, 97, Short.MAX_VALUE))
                    .addContainerGap())
        );
        gl_pnlLevo.setVerticalGroup(
            gl_pnlLevo.createParallelGroup(Alignment.LEADING)
                .addGroup(gl_pnlLevo.createSequentialGroup()
                    .addGap(34)
                    .addComponent(btnPoint)
                    .addGap(18)
                    .addComponent(btnLine)
                    .addGap(18)
                    .addComponent(btnRectangle)
                    .addGap(18)
                    .addComponent(btnCircle)
                    .addGap(18)
                    .addComponent(btnDonut)
                    .addGap(18)
                    .addComponent(btnModify)
                    .addGap(18)
                    .addComponent(btnDelete)
                    .addContainerGap(54, Short.MAX_VALUE))
        );
        pnlLevo.setLayout(gl_pnlLevo);

    }
}

JPanel的代码

package drawing;
import java.awt.Graphics;
import java.awt.event.MouseListener;
import java.util.ArrayList;

import javax.swing.JPanel;
import oblici.Point;
import oblici.Shapes;



public class PnlDrawing extends JPanel implements MouseListener{
    int x,y;
    ArrayList <Shapes> shapesarr = new ArrayList <Shapes>();

    public PnlDrawing() {
        addMouseListener(this);
    }

    @Override
    public void mouseClicked(java.awt.event.MouseEvent e) {
        x = e.getX();
        y = e.getY();
        System.out.println(x + " " + y);
        System.out.println(shapesarr);
        repaint();

    }

    public void paint(Graphics g) {
            Point p = new Point(x,y);
            shapesarr.add(p);
            for (Shapes shapes : shapesarr) {
                shapes.draw(g);

        }
    }


    @Override
    public void mouseEntered(java.awt.event.MouseEvent e) {}
    @Override
    public void mouseExited(java.awt.event.MouseEvent e) {}
    @Override
    public void mousePressed(java.awt.event.MouseEvent e) {}
    @Override
    public void mouseReleased(java.awt.event.MouseEvent e) {
    }

}

如何修复框架内面板中的Java重新绘制对象？

0 个答案: