41 lines
1.1 KiB
Java
41 lines
1.1 KiB
Java
import java.awt.Color;
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import java.awt.Graphics;
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import java.awt.Point;
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import java.awt.event.MouseAdapter;
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import java.awt.event.MouseEvent;
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import java.util.ArrayList;
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import javax.swing.JPanel;
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public class MyPanel extends JPanel {
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private ArrayList<Point> point;
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public MyPanel() {
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point = new ArrayList<Point>();
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// Anonymous class.
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this.addMouseListener(new MouseAdapter() {
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public void mouseClicked(MouseEvent e) {
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// Check whether the left mouse button is clicked
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if (e.getButton() == MouseEvent.BUTTON1) {
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// store the point which been clicked
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point.add(e.getPoint());
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// get the coordinate
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System.out.println("(" + e.getX() + "," + e.getY() + ")");
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}
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}
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});
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}
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@Override
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protected void paintComponent(Graphics g) {
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// must clean the panel before drawing on it.
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super.paintComponent(g);
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g.setColor(Color.RED);
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for (int i = 0; i < point.size(); i++) {
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g.drawRect((int) point.get(i).getX(), (int) point.get(i).getY(), 1, 1);
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} // draw the red square
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repaint();
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}
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}
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