How to draw line to connect components dynamically??
Dear Friends:
I have following code is for drag/drop label, I hope to draw straight line to connect any TWO or more labels within this panel,
[1]. keep all connected line
[2]. can draw dynamically,
I search quite a while with google, still very confused,
Can any guru throw aome light how to do
[1]. code 1:
package swing.dnd;
import java.awt.*;
import javax.swing.*;
public class TestDragComponent extends JFrame {
public TestDragComponent() {
super("Test");
Container c = getContentPane();
c.setLayout(new GridLayout(1,2));
c.add(new MoveableComponentsContainer());
c.add(new MoveableComponentsContainer());
pack();
setVisible(true);
public static void main(String[] args) {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
catch (Exception ex) {
System.out.println(ex);
new TestDragComponent();
[2]. Code 2:
package swing.dnd;
import java.util.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.border.*;
import java.awt.dnd.*;
import java.awt.datatransfer.*;
import java.awt.image.*;
import java.awt.dnd.DragSource;
import java.awt.dnd.DropTarget;
public class MoveableComponentsContainer extends JPanel {
public DragSource dragSource;
public DropTarget dropTarget;
private static BufferedImage buffImage = null; //buff image
private static Point cursorPoint = new Point();
public MoveableComponentsContainer() {
setBorder(BorderFactory.createBevelBorder(BevelBorder.LOWERED, Color.white, Color.gray));
setLayout(null);
dragSource = new DragSource();
ComponentDragSourceListener tdsl = new ComponentDragSourceListener();
dragSource.createDefaultDragGestureRecognizer(this, DnDConstants.ACTION_COPY_OR_MOVE, new ComponentDragGestureListener(tdsl));
ComponentDropTargetListener tdtl = new ComponentDropTargetListener();
dropTarget = new DropTarget(this, DnDConstants.ACTION_MOVE, tdtl);
setPreferredSize(new Dimension(400,400));
addMoveableComponents();
private void addMoveableComponents() {
MoveableLabel lab = new MoveableLabel("label 1");
add(lab);
lab.setLocation(10,10);
lab = new MoveableLabel("label 2");
add(lab);
lab.setLocation(40,40);
lab = new MoveableLabel("label 3");
add(lab);
lab.setLocation(70,70);
lab = new MoveableLabel("label 4");
add(lab);
lab.setLocation(100,100);
final class ComponentDragSourceListener implements DragSourceListener {
public void dragDropEnd(DragSourceDropEvent dsde) {
public void dragEnter(DragSourceDragEvent dsde) {
int action = dsde.getDropAction();
if (action == DnDConstants.ACTION_MOVE) {
dsde.getDragSourceContext().setCursor(DragSource.DefaultMoveDrop);
else {
dsde.getDragSourceContext().setCursor(DragSource.DefaultMoveNoDrop);
public void dragOver(DragSourceDragEvent dsde) {
int action = dsde.getDropAction();
if (action == DnDConstants.ACTION_MOVE) {
dsde.getDragSourceContext().setCursor(DragSource.DefaultMoveDrop);
else {
dsde.getDragSourceContext().setCursor(DragSource.DefaultMoveNoDrop);
public void dropActionChanged(DragSourceDragEvent dsde) {
int action = dsde.getDropAction();
if (action == DnDConstants.ACTION_MOVE) {
dsde.getDragSourceContext().setCursor(DragSource.DefaultMoveDrop);
else {
dsde.getDragSourceContext().setCursor(DragSource.DefaultMoveNoDrop);
public void dragExit(DragSourceEvent dse) {
dse.getDragSourceContext().setCursor(DragSource.DefaultMoveNoDrop);
final class ComponentDragGestureListener implements DragGestureListener {
ComponentDragSourceListener tdsl;
public ComponentDragGestureListener(ComponentDragSourceListener tdsl) {
this.tdsl = tdsl;
public void dragGestureRecognized(DragGestureEvent dge) {
Component comp = getComponentAt(dge.getDragOrigin());
if (comp != null && comp != MoveableComponentsContainer.this) {
cursorPoint.setLocation(SwingUtilities.convertPoint(MoveableComponentsContainer.this, dge.getDragOrigin(), comp));
buffImage = new BufferedImage(comp.getWidth(), comp.getHeight(), java.awt.image.BufferedImage.TYPE_INT_ARGB_PRE);//buffered image reference passing the label's ht and width
Graphics2D graphics = buffImage.createGraphics();//creating the graphics for buffered image
graphics.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER, 0.5f)); //Sets the Composite for the Graphics2D context
boolean opacity = ((JComponent)comp).isOpaque();
if (opacity) {
((JComponent)comp).setOpaque(false);
comp.paint(graphics); //painting the graphics to label
if (opacity) {
((JComponent)comp).setOpaque(true);
graphics.dispose();
remove(comp);
dragSource.startDrag(dge, DragSource.DefaultMoveDrop , buffImage, cursorPoint, new TransferableComponent(comp), tdsl);
revalidate();
repaint();
final class ComponentDropTargetListener implements DropTargetListener {
private Rectangle rect2D = new Rectangle();
Insets insets;
public void dragEnter(DropTargetDragEvent dtde) {
Point pt = dtde.getLocation();
paintImmediately(rect2D.getBounds());
rect2D.setRect((int) (pt.getX()-cursorPoint.getX()),(int) (pt.getY()-cursorPoint.getY()),buffImage.getWidth(),buffImage.getHeight());
((Graphics2D) getGraphics()).drawImage(buffImage,(int) (pt.getX()-cursorPoint.getX()),(int) (pt.getY()-cursorPoint.getY()),MoveableComponentsContainer.this);
dtde.acceptDrag(dtde.getDropAction());
public void dragExit(DropTargetEvent dte) {
paintImmediately(rect2D.getBounds());
public void dragOver(DropTargetDragEvent dtde) {
Point pt = dtde.getLocation();
paintImmediately(rect2D.getBounds());
rect2D.setRect((int) (pt.getX()-cursorPoint.getX()),(int) (pt.getY()-cursorPoint.getY()),buffImage.getWidth(),buffImage.getHeight());
((Graphics2D) getGraphics()).drawImage(buffImage,(int) (pt.getX()-cursorPoint.getX()),(int) (pt.getY()-cursorPoint.getY()),MoveableComponentsContainer.this);
dtde.acceptDrag(dtde.getDropAction());
public void dropActionChanged(DropTargetDragEvent dtde) {
Point pt = dtde.getLocation();
paintImmediately(rect2D.getBounds());
rect2D.setRect((int) (pt.getX()-cursorPoint.getX()),(int) (pt.getY()-cursorPoint.getY()),buffImage.getWidth(),buffImage.getHeight());
((Graphics2D) getGraphics()).drawImage(buffImage,(int) (pt.getX()-cursorPoint.getX()),(int) (pt.getY()-cursorPoint.getY()),MoveableComponentsContainer.this);
dtde.acceptDrag(dtde.getDropAction());
public void drop(DropTargetDropEvent dtde) {
try {
paintImmediately(rect2D.getBounds());
int action = dtde.getDropAction();
Transferable transferable = dtde.getTransferable();
if (transferable.isDataFlavorSupported(TransferableComponent.COMPONENT_FLAVOR)) {
Component comp = (Component) transferable.getTransferData(TransferableComponent.COMPONENT_FLAVOR);
Point location = dtde.getLocation();
if (comp == null) {
dtde.rejectDrop();
dtde.dropComplete(false);
revalidate();
repaint();
return;
else {
add(comp, 0);
comp.setLocation((int)(location.getX()-cursorPoint.getX()),(int)(location.getY()-cursorPoint.getY()));
dtde.dropComplete(true);
revalidate();
repaint();
return;
else {
dtde.rejectDrop();
dtde.dropComplete(false);
return;
catch (Exception e) {
System.out.println(e);
dtde.rejectDrop();
dtde.dropComplete(false);
Thanks so much for any help.
Reagrds
sunny
Craig Wood's code here might do what you want
http://saloon.javaranch.com/cgi-bin/ubb/ultimatebb.cgi?ubb=get_topic&f=2&t=015259
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ComponentMover mover = new ComponentMover();
ActionListener lst = new ActionListener() {
public void actionPerformed(ActionEvent e) {
ComponentMover mover = new ComponentMover();
addMouseListener(mover);
addMouseMotionListener(mover);
isActivated = false;
ActionListener lst1 = new ActionListener() {
public void actionPerformed(ActionEvent e) {
isActivated=true;
btn.addActionListener(lst);
btn1.addActionListener(lst1);
public void paintComponent(final Graphics g)
super.paintComponent(g);
Graphics2D g2 = (Graphics2D)g;
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,RenderingHints.VALUE_ANTIALIAS_ON);
Point[] p;
System.out.println("order.size()"+ order.size());
System.out.println("order1.size()"+ order1.size());
if (!isActivated && order1.size()==0) {
for(int i = 0 ; i < order.size()-1; i++) {
JLabel l1 = (JLabel)order.elementAt(i);
JLabel l2 = (JLabel)order.elementAt(i+1);
order1.add(order.elementAt(i));
order1.add(order.elementAt(i+1));
System.out.println();
p = getCenterPoints(l1, l2);
g2.setColor(Color.black);
g2.draw(new Line2D.Double(p[0], p[1]));
}else if(!isActivated && order1.size()>0){
order=order1;
for(int i1 = 0 ; i1 < order.size()-1; i1++) {
JLabel l1 = (JLabel)order.elementAt(i1);
JLabel l2 = (JLabel)order.elementAt(i1+1);
System.out.println();
p = getCenterPoints(l1, l2);
g2.setColor(Color.red);
g2.draw(new Line2D.Double(p[0], p[1]));
System.out.println(" order1.size() = " + order.size());
}else {
order1 = order;
for(int i1 = 0 ; i1 < order1.size()-1; i1++) {
JLabel l1 = (JLabel)order1.elementAt(i1);
JLabel l2 = (JLabel)order1.elementAt(i1+1);
p = getCenterPoints(l1, l2);
g2.setColor(Color.blue);
if (order.elementAt(i1) !=null){
g2.draw(new Line2D.Double(p[0], p[1]));
private Point[] getCenterPoints(Component c1, Component c2)
Point
p1 = new Point(),
p2 = new Point();
Rectangle
r1 = c1.getBounds(),
r2 = c2.getBounds();
p1.x = r1.x + r1.width/2;
p1.y = r1.y + r1.height/2;
p2.x = r2.x + r2.width/2;
p2.y = r2.y + r2.height/2;
return new Point[] {p1, p2};
private void determineCenterOfComponents()
int
xMin = Integer.MAX_VALUE,
yMin = Integer.MAX_VALUE,
xMax = 0,
yMax = 0;
for(int i = 0; i < labels.length; i++)
Rectangle r = labels.getBounds();
if(r.x < xMin)
xMin = r.x;
if(r.y < yMin)
yMin = r.y;
if(r.x + r.width > xMax)
xMax = r.x + r.width;
if(r.y + r.height > yMax)
yMax = r.y + r.height;
cx = xMin + (xMax - xMin)/2;
cy = yMin + (yMax - yMin)/2;
private class ComponentMover extends MouseInputAdapter
Point offsetP = new Point();
boolean dragging;
public void mousePressed(MouseEvent e)
Point p = e.getPoint();
for(int i = 0; i < labels.length; i++)
Rectangle r = labels[i].getBounds();
if(r.contains(p) && !isActivated )
selectedLabel = labels[i];
order.addElement(labels[i]);
offsetP.x = p.x - r.x;
offsetP.y = p.y - r.y;
dragging = true;
repaint(); //added
break;
public void mouseReleased(MouseEvent e)
dragging = false;
public void mouseDragged(MouseEvent e)
if(dragging)
Rectangle r = selectedLabel.getBounds();
r.x = e.getX() - offsetP.x;
r.y = e.getY() - offsetP.y;
selectedLabel.setBounds(r.x, r.y, r.width, r.height);
//determineCenterOfComponents();
repaint();
private void addLabels()
label1 = new JLabel("Label 1");
label2 = new JLabel("Label 2");
label3 = new JLabel("Label 3");
label4 = new JLabel("Label 4");
labels = new JLabel[] {
label1, label2, label3, label4
for(int i = 0; i < labels.length; i++)
labels[i].setHorizontalAlignment(SwingConstants.CENTER);
labels[i].setBorder(BorderFactory.createEtchedBorder());
add(labels[i]);
Thanks in advance.2 choice, bundle your app in a jar, or get a native compiler.
executable jar
http://java.sun.com/j2se/1.3/docs/guide/jar/jarGuide.html
http://developer.java.sun.com/developer/qow/archive/21/index.html
native
http://gcc.gnu.org/java/
http://www-106.ibm.com/developerworks/library/j-native.html
http://icafe.sourceforge.net/
http://www.towerj.com/
http://www.xlsoft.com/en/products/development/jet/jetpro.html -
Hi all,
I am working on a chart in Design studio on BI platform. The following screen
shot will depict the current state of my chart-
Now
I need to draw lines of different lengths and colors with certain distance from
X-axis, as shown below. (I drew those lines on a screen shot of my chart with
the help of MS paint
but
I need to do this with the help of design studio) . Basically I need help to
get the following output in design studio. So, question is HOW TO DRAW A LINE
IN DESIGN STUDIO?
Kindly,
help with this.
Please suggest me to get the output.
Thanks and Regards.
Rakesh.Hi Tammy,
Thanks for ur reply.
I'm using DS 1.3. and no need of dynamic changes of line on chart.
I just now gone through with CSS, but i didnt get the solution. i think somewhere im getting stuck with CSS.
Can u please suggest me the step by step procedure to draw a line using CSS.
Kindly help on this.
Thanks and Regards,
Rakesh
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