자바 소스코드: Drawing Line by Mouse 예제(repaint)

package javaapplication16;

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import java.util.*;

class GraphicsDrawLineMouseEx extends JFrame{
    GraphicsDrawLineMouseEx(){
        this.setTitle("Drawing Line by Mouse 예제");
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        MyPanel panel = new MyPanel();
        this.add(panel);
        this.setLocationRelativeTo(null);
        this.setSize(300,300);
        this.setVisible(true);
    }
    class MyPanel extends JPanel{
        Vector<Point> vStart = new Vector<Point>();
        Vector<Point> vEnd = new Vector<Point>();
        
        public MyPanel(){
            this.addMouseListener(new MouseListener(){
                @Override
            public void mouseClicked(MouseEvent me) {
            }

            @Override
            public void mousePressed(MouseEvent me) {
                Point startP = me.getPoint();
                vStart.add(startP);
            }

            @Override
            public void mouseReleased(MouseEvent me) {
                Point endP = me.getPoint();
                vEnd.add(endP);
                
                repaint();
            }

            @Override
            public void mouseEntered(MouseEvent me) {
            }

            @Override
            public void mouseExited(MouseEvent me) {
            }
            });
        }
        public void paintComponent(Graphics g){
            super.paintComponent(g);
            g.setColor(Color.BLUE);
            for(int i=0; i<vStart.size(); i++){
                Point s = vStart.elementAt(i);
                Point e = vEnd.elementAt(i);
                
                g.drawLine((int)s.getX(), (int)s.getY(), (int)e.getX(), (int)e.getY());
            }
        }
    }
}
public class JavaApplication16 {
    public static void main(String[] args) {
        new GraphicsDrawLineMouseEx();
    }
}

<결과>

2016/11/12 - [자바] - 자바 소스코드: Clip 사용 예제(클리핑)

2016/11/12 - [자바] - 자바 소스코드: drawImage 사용 예제3(이미지의 일부분을 크기 조절하여 그리기

2016/11/12 - [자바] - 자바 소스코드: drawImage 사용 예제2(패널의 크기에 맞추기)

#자바 #자바 소스코드 #Drawing Line by Mouse 예제 #Vector #Point #마우스 리스너 #repaint();