MouseMoved and MouseDragged problem

**brigadier90** · February 23rd, 2011, 06:05 AM

hey guys,
so heres the problem, i have a stick rotating around the center of the ball when the mouse moves. here are portions of the code:

         public void paintComponent(Graphics g){
		super.paintComponent(g);
	             g.drawImage(Ball.i,Ball.x,Ball.y,null);
		Graphics2D g2 = (Graphics2D)g;
		g2.transform(AffineTransform.getRotateInstance(theta, Ball.x+6, Ball.y+6));
		g2.drawImage(stick,stickx,sticky,null);
          }

here are the mouseMoved and mouseDragged methods:

          public void mouseMoved(MouseEvent e) {
		o =-e.getY()+ cBall.y+6  ;
		a =-e.getX()  + cBall.x+6  ;
		h = Math.hypot(o, a);
		theta = Math.atan2(o, a);
		repaint();
	//record where mouse stopped
		MouseInX= e.getX();
		MouseInY= e.getY();
 
            // this is where the stick is originally 	
		origStickX = Ball.x+6; 
		origStickY = Ball.y +5;
 
	          }
 
           //mouse dfragged method
           public void mouseDragged(MouseEvent e) {
                 hyp = (int) Math.hypot((MouseInX-e.getX()),(MouseInY-e.getY()));
                 stickx = (int) (origStickX +((hyp)*(Math.cos(theta))));
	         sticky = (int) (origStickY +((hyp)*(Math.sin(theta))));
	         repaint();
 
	         }

now the stick rotates towards the mouse so far so good, but in my MouseDragged method i want to pull the stick back according to its angle of rotation in a straight line, like in pool, but with what ive written so far it doesnt always go back in a straight line, sometimes it deviates sideways sometimes it goes in the wrong direction and ive tried many things but i am stuck, just wondering if anyone has any idea how i may be able to approach this, the code above does not include the instance variables but they are all there. any help would be greatly appreciated.

**KevinWorkman** · February 23rd, 2011, 08:24 AM

If you want help, you'll probably want to provide an SSCCE that demonstrates the problem, so we can run it and play with it ourselves. This doesn't mean paste in your whole program.

**brigadier90** · February 23rd, 2011, 11:52 AM

sorry if its a bit long, this is as short as i could make it, thx again for taking a look:

import java.awt.*;
import java.awt.event.*;
import java.awt.geom.AffineTransform;
import javax.swing.*;
 
 
public class SSCCE extends JPanel   {
 
	public static void main(String args[]){
		SSCCE s = new SSCCE();
		JFrame f = new JFrame("SSCCE");
		f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		f.setVisible(true);
		f.setSize(500,500);
		f.add(s);
	}
 
	public SSCCE(){
		Handler handler = new Handler();
		addMouseMotionListener(handler);
		addMouseListener(handler);
		ballx =200;
		bally=200;
		stickx = ballx+6;
		sticky = bally+5;
		}
 
	public void paintComponent(Graphics g){
 
		super.paintComponent(g);
		g.fillOval(ballx, bally, 13, 13);
		Graphics2D g2 = (Graphics2D)g;
		// rotate with anchor point in the middle of the ball
		g2.transform(AffineTransform.getRotateInstance(theta, ballx+6, bally+6));
		//draw the stick at the center of the ball
		g2.fillRect(stickx, sticky, 200, 3);
	}
 
	private class Handler implements MouseMotionListener, MouseListener{
 
	private int MouseInX;
	private int MouseInY;
	private int hyp;
	private int origCueX;
	private int origCueY;
 
 
	public void mouseMoved(MouseEvent e) {
		o =-e.getY()+ ballx+6  ;
		a =-e.getX()  + bally+6  ;
		theta = Math.atan2(o, a);
		repaint();
		//record where mouse stopped
		MouseInX= e.getX();
		MouseInY= e.getY();
 
		origCueX = ballx+6;
		origCueY = bally +5;
 
		}
 
	public void mouseDragged(MouseEvent e) {
 
		hyp = (int) Math.hypot((MouseInX-e.getX()),(MouseInY-e.getY()));
		stickx = (int) (origCueX +((hyp)*(Math.cos(theta))));
		sticky = (int) (origCueY +((hyp)*(Math.sin(theta))));
		repaint();
 
		}
 
	public void mouseClicked(MouseEvent e) {
 
 
 
	}
 
	public void mouseEntered(MouseEvent arg0) {
		// TODO Auto-generated method stub
 
	}
 
	public void mouseExited(MouseEvent arg0) {
		// TODO Auto-generated method stub
 
	}
 
	public void mousePressed(MouseEvent e) {
 
 
	}
 
	public void mouseReleased(MouseEvent arg0) {
		stickx = origCueX;
		sticky= origCueY;
		repaint();
 
	}
 
}
	double o; // used for stick rotation
	double a; //used for stick rotation
	double theta; // rotates stick
	private int stickx;
	private int sticky;
	private int ballx;
	private int bally;
 
 
}

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