Paint with Dots Java

For Lab 2, you're modifying the Dots and DotsPanel classes from your text to make a simple Paint program. Modify the program to

1. Paint with continuous dots by adding a MouseMotionListener that adds points to the pointsList when the mouseDragged event is triggered.
2. Add some color to the dots by changing the page.setColor(...). A hint is given below.

This is what i have

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

public class DotsPanel extends JPanel { private final int SIZE = 6; // radius of each dot

private ArrayList pointList;

//----------------------------------------------------------------- // Constructor: Sets up this panel to listen for mouse events. //----------------------------------------------------------------- public DotsPanel() { pointList = new ArrayList();

addMouseListener (new DotsListener());

setBackground(Color.black); setPreferredSize(new Dimension(300, 200)); }

//----------------------------------------------------------------- // Draws all of the dots stored in the list. //----------------------------------------------------------------- public void paintComponent(Graphics page) { super.paintComponent(page);

SecureRandom randomNum = new SecureRandom(); Color color = new Color(randomNum.nextInt(256); randomNum.nextInt(256) randomNum.nextInt(256));

page.setColor(Color.green);

for (Point spot : pointList) page.fillOval(spot.x-SIZE, spot.y-SIZE, SIZE*2, SIZE*2);

page.drawString("Count: " + pointList.size(), 5, 15); }

//***************************************************************** // Represents the listener for mouse events. //***************************************************************** private class DotsListener implements MouseListener { //-------------------------------------------------------------- // Adds the current point to the list of points and redraws // the panel whenever the mouse button is pressed. //-------------------------------------------------------------- public void mousePressed(MouseEvent event) { pointList.add(event.getPoint()); repaint(); }

//-------------------------------------------------------------- // Provide empty definitions for unused event methods. //-------------------------------------------------------------- public void mouseClicked(MouseEvent event) {} public void mouseReleased(MouseEvent event) {} public void mouseEntered(MouseEvent event) {} public void mouseExited(MouseEvent event) {} } } JFrame frame = new JFrame(); frame.add(new DotsPanel(); frame.setDefualtCloseOperation(jFrame.EXIT_ON_CLOSE);

frame.setBounds(20,20,500,500); frame.setVisible(true); } }

/* HINTS: For random-colored dots, generate three random numbers R, G, and B between 0 and 1.0 (or 0 and 255 integer) and use:

page.setColor(new Color(R,G,B)); //before drawing each dot, individually

For something more fluid, use a counter/iterator variable, and change the color based on that iterator, multiplying or adding it and modding by 256 (for each Red, Green, Blue component):

page.setColor(new Color(i%255, (i*2)%255, (i+128)%255); // really slick :) - play with multiples/adds */

Submit just the Java source code files (Dots.java and DotsPanel.java or similar) from your project's 'src' folder. The files should contain the following lines of comments at the top: