막대 그래프 그리는 코드로 이것 저것 고쳐가며 실습을 해본 기록을 남깁니다.
아직 이해가 덜된 부분도 있습니다. 아래 Listener부분... 계속 공부해야죠~
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
public class bargraph
{
public static void main(String args[])
{
JFrame frame = new JFrame("Program Language School");
frame.setLocation(500,200);
frame.setPreferredSize(new Dimension(400,350));
Container contentPane = frame.getContentPane();
DrawingPanel drawingPanel = new DrawingPanel();
contentPane.add(drawingPanel, BorderLayout.CENTER);
//그래프를 그릴 패널
JPanel controlPanel = new JPanel();
JTextField text1 = new JTextField(3);
JTextField text2 = new JTextField(3);
JTextField text3 = new JTextField(3);
JButton button = new JButton("Show");
controlPanel.add(new JLabel("Java"));
controlPanel.add(text1);
controlPanel.add(new JLabel("Python"));
controlPanel.add(text2);
controlPanel.add(new JLabel("C#"));
controlPanel.add(text3);
controlPanel.add(button);
contentPane.add(controlPanel, BorderLayout.SOUTH);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
button.addActionListener(new DrawActionListener(text1,text2,text3,drawingPanel));
//"그래프 그리기" 버튼을 눌렀을때 작동 할 리스터등록
frame.pack();
frame.setVisible(true);
}
}
//그래프를 그리는 패널 클래스
class DrawingPanel extends JPanel
{
int score_java, score_python, score_cs;
public void paint(Graphics g){
g.clearRect(0,0,getWidth(),getHeight());
g.drawLine(50,250,350,250);
for(int cnt = 1 ;cnt<11;cnt++)
{
g.drawString(cnt *10 +"",25,255-20*cnt);
g.drawLine(50, 250-20*cnt, 350,250-20*cnt);
}
g.drawLine(50,20,50,250);
g.drawString("Java",100,270);
g.drawString("Python",200,270);
g.drawString("C#",300,270);
g.setColor(Color.BLUE);
if (score_java>0)
g.fillRect(110,250-score_java*2,10,score_java*2);
if(score_python>0)
g.fillRect(210,250-score_python*2,10,score_python*2);
if(score_cs>0)
g.fillRect(310,250-score_cs*2,10,score_cs*2);
}
void setScores(int score_java, int score_python, int score_cs)
{
this.score_java=score_java;
this.score_python=score_python;
this.score_cs=score_cs;
}
}
//버튼 눌렀을때 동작하는 리스너
class DrawActionListener implements ActionListener
{
JTextField text1,text2,text3;
DrawingPanel drawingPanel;
DrawActionListener(JTextField text1, JTextField text2, JTextField text3, DrawingPanel drawingPanel)
{
this.text1=text1;
this.text2=text2;
this.text3=text3;
this.drawingPanel = drawingPanel;
}
public void actionPerformed(ActionEvent e)
{
try
{
int korean = Integer.parseInt(text1.getText());
int english = Integer.parseInt(text2.getText());
int math = Integer.parseInt(text3.getText());
drawingPanel.setScores(korean, english, math);
drawingPanel.repaint();
}
catch (NumberFormatException nfe){
JOptionPane.showMessageDialog(drawingPanel,"잘못된 숫자 입력입니다","에러메시지",JOptionPane.ERROR_MESSAGE);
}
}
}
