Draw Panel

[coolsport04]

I am trying to write a program that kind of resembles and etch-a-sketch. I have the basis for it. I am having two problems:

1. When I draw a shape in the default black color, when I switch the color it changes the color of what I had previously drawn. I would like what I drew before to stay that color and the new color to be only on the new shape that I draw.

2. I am also having trouble with my radio buttons. They work, however, when I draw a filled shaped and then draw an unfilled shape, it changes the previous to unfilled. I would like the previous to stay as is, and only change the new shape.

Any suggestions?
Thanks.

import java.awt.geom.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.util.*;

public class DrawPanel extends JFrame implements ActionListener {
	Container content;

	Color color = Color.BLACK;
	JButton colorButton = new JButton("Color Chooser");

	LinkedList<Shape> shapeList = new LinkedList<Shape>();
	Shape shape;
	Point start, end;
	final String[] type = new String[] { "Line", "Rectangle", "Oval" };
	JComboBox comboBox = new JComboBox(type);

	JRadioButton fillRadio = new JRadioButton("Fill w/ color");
	JRadioButton noFillRadio = new JRadioButton("Do Not Fill w/ Color");
	ButtonGroup group = new ButtonGroup();

	boolean filledOrNot = false;

	public DrawPanel() {
		super("DrawPanel");

		colorButton.addActionListener(this);
		fillRadio.addActionListener(this);
		noFillRadio.addActionListener(this);
		add(fillRadio, BorderLayout.CENTER);
		add(noFillRadio, BorderLayout.EAST);
		group.add(fillRadio);
		group.add(noFillRadio);

		JPanel panel = new JPanel() {
			public void paintComponent(Graphics g) {
				super.paintComponent(g);
				Graphics2D g2 = (Graphics2D) g;
				g2.setColor(Color.white);
				g2.fillRect(0, 0, getWidth(), getHeight());
				g2.setColor(color);
				for (Shape s : shapeList){
					g2.draw(s);
				}

				g2.draw(shape);
				if(filledOrNot){
					g2.setColor(color);
					g2.fill(shape);
				}
			}

		};

		panel.addMouseListener(new MouseAdapter() {
			public void mousePressed(MouseEvent e) {
				start = e.getPoint();
			}

			public void mouseReleased(MouseEvent e) {
				shapeList.add(shape);
			}
		});

		panel.addMouseMotionListener(new MouseMotionAdapter() {
			public void mouseDragged(MouseEvent e) {
				end = e.getPoint();
				Object select = comboBox.getSelectedItem();
				if (select.equals(type[0]))
					shape = new Line2D.Float(start, end);
				else {
					if (select.equals(type[1]))
						shape = new Rectangle();
					else
						shape = new Ellipse2D.Float();
					((RectangularShape) shape).setFrameFromDiagonal(start, end);
				}
				repaint();
			}
		});

		panel.setPreferredSize(new Dimension(320, 440));
		add(panel, BorderLayout.NORTH);
		shape = new Rectangle();

		add(comboBox, BorderLayout.SOUTH);
		add(colorButton, BorderLayout.WEST);

		pack();
		setDefaultCloseOperation(EXIT_ON_CLOSE);
		setVisible(true);

	}

	public void changeColor() {
		color = JColorChooser.showDialog(this, "Choose Background Color",
				Color.BLACK);
	}

	public void actionPerformed(ActionEvent e) {
   if (e.getSource() == colorButton) {
           this.changeColor();
   } else if (e.getSource() == fillRadio){
           if (fillRadio.isSelected())
                   filledOrNot = true;
   } else if (e.getSource() == noFillRadio){
           if(noFillRadio.isSelected())
                   filledOrNot = false;
   }

	}

	public static void main(String[] args) {
		new DrawPanel();
	}
}

[Ezzaral]

You could make your own PaintShape class that contains a Shape reference and those two properties. You can pass all of the info through the constructor and access it as you loop through your shapes in the paintComponent() method.

[hfx642]

Keep track of your colours for EACH "shape" being drawn.

[Ezzaral]

Yes, that was the intention for the small custom class I mentioned above, in case I wasn't very clear.

class PaintShape{
   Shape shape;
   Color color;
... // etc
}

and a list of those

LinkedList<PaintShape> shapeList = new LinkedList<PaintShape>();