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Labs/Lab11/Lab11_2230026071/Question5/src/MyFrame.java

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+import java.awt.BorderLayout;
+import java.awt.FlowLayout;
+import java.awt.Point;
+import java.awt.event.ActionEvent;
+import java.awt.event.ActionListener;
+import java.awt.event.MouseAdapter;
+import java.awt.event.MouseEvent;
+
+import javax.swing.JButton;
+import javax.swing.JFrame;
+import javax.swing.JPanel;
+
+public class MyFrame extends JFrame {
+	public MyFrame() {
+		//Auxiliary
+		this.setTitle("My Frame Title");
+		this.setSize(400, 300);
+		this.setLocationRelativeTo(null);
+		this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+		this.setLayout(new BorderLayout());
+		
+		//JPanel
+		JPanel p = new JPanel();
+		p.setLayout(new FlowLayout());
+		this.add(p, BorderLayout.PAGE_START);
+		JButton b1 = new JButton("Reset");
+		JButton b2 = new JButton("right");
+		p.add(b1);
+		p.add(b2);
+		
+		//MyPanel
+		MyPanel myPanel = new MyPanel();
+		this.add(myPanel, BorderLayout.CENTER);
+		
+		//button setting
+		b1.addActionListener(new ActionListener() { // Anonymous class.
+			@Override
+			public void actionPerformed(ActionEvent e) {
+				myPanel.clearAllPoints();
+			}
+		});
+		
+		//setVisible
+		this.setVisible(true);
+	}
+}

Labs/Lab11/Lab11_2230026071/Question5/src/MyPanel.java

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+import java.awt.Color;
+import java.awt.Graphics;
+import java.awt.Point;
+import java.awt.event.MouseAdapter;
+import java.awt.event.MouseEvent;
+import java.util.ArrayList;
+
+import javax.swing.JPanel;
+
+public class MyPanel extends JPanel {
+	//instance variables
+	private static ArrayList<Point> points = new ArrayList<Point>();
+	
+	//constructor
+	public MyPanel() {
+		//mouse listener
+		this.addMouseListener(new MouseAdapter() { // Anonymous class.
+			@Override
+			public void mouseClicked(MouseEvent e) {
+				//if left button clicked
+				if(e.getButton() == MouseEvent.BUTTON1) {
+					Point p = e.getPoint();
+					System.out.println("x: " + p.x + " y: " + p.y);
+					points.add(p);
+					repaint(); //force invoke paintComponent()
+				}
+			}
+		});
+	}
+	
+	//methods
+	@Override
+	protected void paintComponent(Graphics g) {
+		super.paintComponent(g);
+		g.setColor(Color.RED);
+		for(int i = 0; i < points.size(); ++i) {
+			if(i == 0) g.drawLine((int)points.get(0).x, (int)points.get(0).y, (int)points.get(0).x, (int)points.get(0).y);
+			else g.drawLine((int)points.get(i).x, (int)points.get(i).y, (int)points.get(i-1).x, (int)points.get(i-1).y);
+		}
+	}
+	
+	public void clearAllPoints() {
+		points.clear(); //clear all the array elements
+		repaint();
+	}
+}

Labs/Lab11/Lab11_2230026071/Question5/src/Start.java

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+
+public class Start {
+
+	public static void main(String[] args) {
+		javax.swing.SwingUtilities.invokeLater(new Runnable() {
+			@Override
+			public void run() {
+				new MyFrame();
+			}
+		});
+	}
+
+}