sophyan julio

Is it possible to change the color properties of the graphics object of one component in another component?

I extended a Jcomponent class for an applet so that I can make it a canvas to perform drawing on. The problem I'm having is when I do a repaint(); in the mousedragged handler, the applet draws extra components in the applet viewer. Is this an affect of thread safety? This problem is solved if I called paintComponent() instead of repaint(), but this method is not recommended in the java docs so I'm wondering what the real problem is.

public class mycanvas extends JComponent implements MouseMotionListener, MouseListener{ .... public void mouseDragged(MouseEvent e){ newx = e.getX(); newy = e.getY(); Graphics g = this.getGraphics(); try { javax.swing.SwingUtilities.invokeLater(new Runnable() { public void run() { repaint(); } }); } catch (Exception ev) { System.err.println("createGUI didn't successfully complete"); } e.consume(); } public void paintComponent(Graphics g){ super.paintComponents(g); g2 = (Graphics2D) g; g2.setBackground(Color.WHITE); BasicStroke stroke = new BasicStroke(40,0,1); stroke.createStrokedShape(new Ellipse2D.Float(10,10,10,10)); g2.setStroke(stroke); g2.drawLine(oldx,oldy,newx,newy); oldx = newx; oldy = newy; } ..... }

I have a function that captues mouse input which then draws a size 20 pixel line. But using BasicStroke stroke = new BasicStroke(30,0,2); I get jagged lines within my drawn line, when I do a Drawline(). Is there a way to eliminate these artifacts?

I have already tried
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);

but it does not improve the drawline function.

http://flickr.com/photos/fuoco/45073180

[ September 20, 2005: Message edited by: sophyan julio ]

thanks for your reply! i will use less of the VE feature in eclipse ;<

SUN used this snippet to show the corect way to create new UI Swing components. According to SUN this is so that the Milestone events like init, stop etc. will be placed on the event-dispatching thread used by the browser.

public void init() { //Execute a job on the event-dispatching thread: //creating this applet's GUI. try { javax.swing.SwingUtilities.invokeAndWait(new Runnable() { public void run() { createGUI(); } }); } catch (Exception e) { System.err.println("createGUI didn't successfully complete"); } } private void createGUI() { JLabel label = new JLabel( "You are successfully running a Swing applet!"); label.setHorizontalAlignment(JLabel.CENTER); label.setBorder(BorderFactory.createMatteBorder(1,1,1,1,Color.black)); getContentPane().add(label, BorderLayout.CENTER); }

If I wanted to add a button, do I insert a new JButton in the createGUI function ?

Also I am developing in Eclipse, and when I create a new Japplet and added a new button component in Eclipse, the code generator does not adhere to the example above. Does this mean that the code generated in Eclipse is not kosher/threadsafe?

ie.
private JButton getButton1() { if (button1 == null) { button1 = new JButton(); button1.setText("boo"); } return button1; }

What are the 2 differences in both implementations, and which would you follow in your development?
[ September 16, 2005: Message edited by: sophyan julio ]