java 2d

[hari thatikonda]

hi i am developing an application in swings. it has graphs the graph line moves slowly to the value given in by user(instead pop up the graph, the line in the graph starts from 0 and move up to the mark). how can i do it? if i do it in java2d how can i plug that into swings

[Craig Wood]

import java.awt.*;
import java.awt.event.*;
import java.awt.geom.*;
import javax.swing.*;
import javax.swing.Timer;
 
public class TimedDrawing
{
    public static void main(String[] args)
    {
        JFrame f = new JFrame("click on graph surface");
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.getContentPane().add(new SlowMotion());
        f.setSize(400,400);
        f.setLocation(200,200);
        f.setVisible(true);
    }
}
 
class SlowMotion extends JPanel
{
    private final int PAD = 20;
    private Line2D connector;
    protected Point origin;
 
    public SlowMotion()
    {
        connector = new Line2D.Double();
        setBackground(Color.white);
        addMouseListener(new Scheduler(this));
    }
 
    protected void paintComponent(Graphics g)
    {
        super.paintComponent(g);
        Graphics2D g2 = (Graphics2D)g;
        g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
                            RenderingHints.VALUE_ANTIALIAS_ON);
        int w = getWidth();
        int h = getHeight();
        if(origin == null)
            origin = new Point(PAD, h - PAD);
        // ordinate
        g2.draw(new Line2D.Double(origin.x, origin.y, w - PAD, h - PAD));
        // abcissa
        g2.draw(new Line2D.Double(PAD, PAD, origin.x, origin.y));
        g2.draw(connector);
    }
 
    public void advance(Point2D p)
    {
        connector.setLine(origin, p);
        repaint();
    }
}
 
class Scheduler extends MouseAdapter
{
    SlowMotion slowMotion;
    LineTimer lineTimer;
    double theta;
    int inc = 5;
 
    public Scheduler(SlowMotion sm)
    {
        slowMotion = sm;
        lineTimer = new LineTimer();
    }
 
    public void mousePressed(MouseEvent e)
    {
        Point p = e.getPoint();
        int dx = p.x - slowMotion.origin.x;
        int dy = slowMotion.origin.y - p.y;
        theta = Math.atan2(dy, dx);
        double length = slowMotion.origin.distance(p);
        int cycles = (int)((length / inc) + (length % inc > 0 ? 1 : 0));
        lineTimer.start(cycles, p);
    }
 
    private class LineTimer
    {
        Timer timer;
        final int DELAY = 125;
        int limit, count;
        Point end;
 
        public LineTimer()
        {
            count = 0;
            timer = new Timer(DELAY, new ActionListener()
            {
                public void actionPerformed(ActionEvent e)
                {
                    Point2D p = getNextPoint();
                    if(count++ == limit - 1)
                    {
                        timer.stop();
                        p = end;
                    }
                    slowMotion.advance(p);
                }
            });
         }
 
         private Point2D getNextPoint()
         {
             Point2D.Double p = new Point2D.Double();
             p.x = slowMotion.origin.x + count * inc * Math.cos(theta);
             p.y = slowMotion.origin.y - count * inc * Math.sin(theta);
             //System.out.println("count " + count + "\t" + p.distance(end));
             return p;
         }
 
         public void start(int limit, Point target)
         {
             this.limit = limit;
             end = target;
             count = 0;
             timer.start();
         }
    }
}

[hari thatikonda]

hey u r genius. thank u very much