Problem in drawing rectangle with mouse drag!!

Check out my MouseDragOutliner. It should be perfect for what you are doing

You are welcome to use and modify this code, but please do not change the package or take credit for it as your own code

tjacobs.ui.MouseDragOutliner.java

===========================

package tjacobs.ui;

import java.awt.BasicStroke;

import java.awt.Color;

import java.awt.Component;

import java.awt.Container;

import java.awt.Graphics;

import java.awt.Graphics2D;

import java.awt.Point;

import java.awt.Stroke;

import java.awt.event.*;

import java.util.ArrayList;

import java.util.Iterator;

import javax.swing.JFrame;

import javax.swing.JPanel;

import javax.swing.SwingUtilities;

/**

* See the public static method addAMouseDragOutliner

*/

public class MouseDragOutliner extends MouseAdapter implements MouseMotionListener {

public static final BasicStroke DASH_STROKE = new BasicStroke(1.0f, BasicStroke.CAP_SQUARE, BasicStroke.JOIN_BEVEL, 10.0f, new float[] {8, 8}, 0);

public static final boolean RECTANGLE = true;

public static final boolean OVAL = false;

private boolean mUseMove = false;

private Point mStart;

private Point mEnd;

private boolean mShape = RECTANGLE;

private Component mComponent;

private MyRunnable mRunner= new MyRunnable();

private ArrayList mListeners = new ArrayList(1);

public MouseDragOutliner() {

super();

}

public MouseDragOutliner(boolean useMove) {

this();

mUseMove = useMove;

}

public void setShape(boolean b) {

mShape = b;

}

public void mouseDragged(MouseEvent me) {

doMouseDragged(me);

}

public void mousePressed(MouseEvent me) {

mStart = me.getPoint();

}

public void mouseEntered(MouseEvent me) {

mStart = me.getPoint();

}

public void mouseReleased(MouseEvent me) {

Iterator i = mListeners.iterator();

Point end = me.getPoint();

while (i.hasNext()) {

((OutlineListener)i.next()).mouseDragEnded(mStart, end);

}

//mStart = null;

}

public void mouseMoved(MouseEvent me) {

if (mUseMove) {

doMouseDragged(me);

}

}

publicvoid addOutlineListener(OutlineListener ol) {

mListeners.add(ol);

}

public void removeOutlineListener(OutlineListener ol) {

mListeners.remove(ol);

}

private class MyRunnable implements Runnable {

public void run() {

Graphics g = mComponent.getGraphics();

if (g == null) {

return;

}

Graphics2D g2 = (Graphics2D) g;

Stroke s = g2.getStroke();

g2.setStroke(DASH_STROKE);

int x = Math.min(mStart.x, mEnd.x);

int y = Math.min(mStart.y, mEnd.y);

int w = Math.abs(mEnd.x - mStart.x);

int h = Math.abs(mEnd.y - mStart.y);

g2.setXORMode(Color.WHITE);

if (mShape == RECTANGLE) g2.drawRect(x, y, w, h);

else g2.drawOval(x, y, w, h);

g2.setStroke(s);

}

}

public void doMouseDragged(MouseEvent me) {

mEnd = me.getPoint();

if (mStart != null) {

mComponent = me.getComponent();

mComponent.repaint();

SwingUtilities.invokeLater(mRunner);

}

}

public static MouseDragOutliner addAMouseDragOutliner(Component c) {

MouseDragOutliner mdo = new MouseDragOutliner();

c.addMouseListener(mdo);

c.addMouseMotionListener(mdo);

return mdo;

}

public static interface OutlineListener {

public void mouseDragEnded(Point start, Point finish);

}

public static void main(String[] args) {

JFrame f = new JFrame("MouseDragOutliner Test");

Container c = f.getContentPane();

JPanel p = new JPanel();

//p.setBackground(Color.BLACK);

c.add(p);

MouseDragOutliner outliner = addAMouseDragOutliner(p);

outliner.setShape(OVAL);

f.setBounds(200, 200, 400, 400);

f.setVisible(true);

}

}

tjacobs01a at 2007-7-9 22:38:18 >