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PODraw the line on the Jpanel when dragging the mouse
 

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    <p>I want to draw 2 (or more ) lines on JPanel when the mouse drags. When i use <code>super.paintComponent(g)</code> in my code, I couldn't draw 2 lines on the panel, however when I don't use <code>super.paintComponent(g)</code>;, the result is ugly, like the pic below :</p> <p><img src="https://i.stack.imgur.com/tR5Jv.jpg" alt="enter image description here"></p> <p>I understand why the lines behaved like that. </p> <p>How could I draw the lines on the Jpanel when dragging the mouse? BTW, the line drawn by <code>g2d.draw(line2d)</code> sometimes it's not the smooth line (pic below)</p> <p><img src="https://i.stack.imgur.com/pOfs7.jpg" alt="enter image description here"></p> <p>My codes so far :</p> <pre><code>import java.awt.*; import java.awt.event.MouseAdapter; import java.awt.event.MouseEvent; import java.awt.event.MouseListener; import java.awt.event.MouseMotionListener; import java.awt.geom.Line2D; import java.util.ArrayList; import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.WindowConstants; public class LineDrawing extends JPanel implements MouseMotionListener, MouseListener{ Point point1; Point point2; Line2D line2d; public LineDrawing(){ super(); addMouseListener(this); addMouseMotionListener(this); } @Override public void paintComponent(Graphics g){ //super.paintComponent(g); Graphics2D g2d = (Graphics2D) g; if(point1!=null &amp;&amp; point2!=null){ g2d.setPaint(Color.RED); g2d.setStroke(new BasicStroke(1.5f)); g2d.draw(line2d); } } @Override public void mouseDragged(MouseEvent e) { point2 = e.getPoint(); line2d = new Line2D.Double(point1, point2); repaint(); } @Override public void mouseMoved(MouseEvent e) { } @Override public void mouseClicked(MouseEvent e) { } @Override public void mousePressed(MouseEvent e) { point1 = e.getPoint(); } @Override public void mouseReleased(MouseEvent e) { } @Override public void mouseEntered(MouseEvent e) { } @Override public void mouseExited(MouseEvent e) { } public static void main(String a[]){ EventQueue.invokeLater(new Runnable(){ @Override public void run() { JFrame frame = new JFrame(); LineDrawing linedraw= new LineDrawing(); frame.add(linedraw); frame.setSize(500,500); frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE); frame.setVisible(true); } }); } </code></pre> <p>}</p>
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