Help me make my painting go faster

Question

Hi!
This is the paint code for my drawingprogram. It is a JPanel which contains everything that users has drawn AND is drawing. When I've drawn alot of objects then it starts getting slower and the painting can't follow up with my mouseDragged event. This is what I need fixed!
First off I paint all the objects that are STORED in a model. Then I start painting the object(only 1 at the time) that the user is CURRENTLY drawing.
All calls are made by invoking repaint().
question: should I override paint() or paintComponent()? What will be the difference.
I need some tips of how I can make this code quicker..I know for example I should use a different call to repaint by specifying only the area needed to paint out again. But do you have more tips?
public void paintComponent(Graphics gx)
        super.paintComponent(gx);
        Graphics2D g = (Graphics2D) gx.create();  //make a copy of the graphics object
        LinkedList listOfDrawingObjects = controller.getListOfDrawingObjects();
        LinkedList currentDrawingObjects = new LinkedList(listOfDrawingObjects); //make a copy to avoid ConcurrentModificationException
        ListIterator it = currentDrawingObjects.listIterator();
/* PAINT OUT ALL OBJECTS IN THE MODEL */
        while(it.hasNext())
            DrawingObject ob = (DrawingObject) it.next();
            if(ob instanceof MyLine)
                MyLine myLine = (MyLine) ob;
                g.setColor(myLine.getColor());
                g.setStroke(stroke.getDrawingStrokeSize(myLine.getStrokeSize()));
                g.drawLine((int)myLine.getX1(), (int)myLine.getY1(), (int)myLine.getX2(), (int)myLine.getY2());
            else if(ob instanceof MyRectangle)
                MyRectangle myRectangle = (MyRectangle) ob;
                g.setColor(myRectangle.getColor());
                g.setStroke(stroke.getDrawingStrokeSize(myRectangle.getStrokeSize()));
                if(myRectangle.getFilled())
                    g.fillRect((int)myRectangle.getX(), (int)myRectangle.getY(), (int)myRectangle.getWidth(), (int)myRectangle.getHeight());
                else
                    g.drawRect((int)myRectangle.getX(), (int)myRectangle.getY(), (int)myRectangle.getWidth(), (int)myRectangle.getHeight());     
            else if(ob instanceof MyOval)
                MyOval myOval = (MyOval) ob;
                g.setColor(myOval.getColor());
                g.setStroke(stroke.getDrawingStrokeSize(myOval.getStrokeSize()));
                if(myOval.getFilled())
                    g.fillOval((int)myOval.getX(), (int)myOval.getY(), (int)myOval.getWidth(), (int)myOval.getHeight());
                else
                    g.drawOval((int)myOval.getX(), (int)myOval.getY(), (int)myOval.getWidth(), (int)myOval.getHeight());
            else if(ob instanceof MyRoundRectangle)
                MyRoundRectangle myRoundRectangle = (MyRoundRectangle) ob;
                g.setColor(myRoundRectangle.getColor());
                 g.setStroke(stroke.getDrawingStrokeSize(myRoundRectangle.getStrokeSize()));
                if(myRoundRectangle.getFilled())
                    g.fillRoundRect((int)myRoundRectangle.getX(), (int)myRoundRectangle.getY(), (int)myRoundRectangle.getWidth(), (int)myRoundRectangle.getHeight(), (int)myRoundRectangle.getArcWidth(), (int)myRoundRectangle.getArcHeight());
                else
                    g.drawRoundRect((int)myRoundRectangle.getX(), (int)myRoundRectangle.getY(), (int)myRoundRectangle.getWidth(), (int)myRoundRectangle.getHeight(), (int)myRoundRectangle.getArcWidth(), (int)myRoundRectangle.getArcHeight());
            else if(ob instanceof MyFreeDraw)
            MyFreeDraw myFreeDraw = (MyFreeDraw) ob;
                g.setColor(myFreeDraw.getColor());
                g.setStroke(stroke.getDrawingStrokeSize(myFreeDraw.getStrokeSize()));
                LinkedList tempPoints = myFreeDraw.getAllPoints();
                LinkedList allPoints = new LinkedList(tempPoints); //avoids ConcurrentException
                if(allPoints.size()>=2)
                    ListIterator it2 = allPoints.listIterator(0);
                    ListIterator it3 = allPoints.listIterator(1); //must be one step ahead since two points are needed to draw
                    while(it2.hasNext() && it3.hasNext())
                        Object ob2 = it2.next();
                        Object ob3 = it3.next();
                        if(ob2 instanceof Point)
                            Point p = (Point) ob2;
                            Point t = (Point) ob3;
                            g.drawLine(p.x, p.y, t.x, t.y);
            else if(ob instanceof MyPolygon)
                MyPolygon myPolygon = (MyPolygon) ob;
                g.setColor(myPolygon.getColor());
                g.setStroke(stroke.getDrawingStrokeSize(myPolygon.getStrokeSize()));
                if(myPolygon.getFilled())
                    g.fillPolygon(myPolygon);
                else
                    g.drawPolygon(myPolygon);
            else if(ob instanceof MyText)
                MyText myText = (MyText) ob;
                g.setColor(myText.getColor());
                g.setFont(myText.getFont());
                g.drawString(myText.getText(), (int)myText.getStart().getX(), (int)myText.getStart().getY());
/* STARTS PAINTING OUT ALL TEMPORARY OBJECTS*/
        if(rectangle!=null && rectangle.getStart()!=null && rectangle.getStop()!=null)
            g.setColor(rectangle.getColor());
            g.setStroke(stroke.getDrawingStrokeSize(rectangle.getStrokeSize()));
            if(rectangle.getFilled())
                g.fillRect((int)rectangle.getX(), (int)rectangle.getY(), (int)rectangle.getWidth(), (int)rectangle.getHeight());
            else
                g.drawRect((int)rectangle.getX(), (int)rectangle.getY(), (int)rectangle.getWidth(), (int)rectangle.getHeight());     
        else if(oval!=null && oval.getStart()!=null && oval.getStop()!=null)
            g.setColor(oval.getColor());
            g.setStroke(stroke.getDrawingStrokeSize(oval.getStrokeSize()));
            if(oval.getFilled())
                g.fillOval((int)oval.getX(), (int)oval.getY(), (int)oval.getWidth(), (int)oval.getHeight());
            else
                g.drawOval((int)oval.getX(), (int)oval.getY(), (int)oval.getWidth(), (int)oval.getHeight());
        else if(line!=null && line.getStart()!=null && line.getStop()!=null)
            g.setColor(line.getColor());
            g.setStroke(stroke.getDrawingStrokeSize(line.getStrokeSize()));
            g.drawLine((int)line.getX1(), (int)line.getY1(), (int)line.getX2(), (int)line.getY2());
        else if(roundRectangle!=null && roundRectangle.getStart()!=null && roundRectangle.getStop()!=null)
            g.setColor(roundRectangle.getColor());
            g.setStroke(stroke.getDrawingStrokeSize(roundRectangle.getStrokeSize()));
            if(roundRectangle.getFilled())
                g.fillRoundRect((int)roundRectangle.getX(), (int)roundRectangle.getY(), (int)roundRectangle.getWidth(), (int)roundRectangle.getHeight(), (int)roundRectangle.getArcWidth(), (int)roundRectangle.getArcHeight());
            else
                g.drawRoundRect((int)roundRectangle.getX(), (int)roundRectangle.getY(), (int)roundRectangle.getWidth(), (int)roundRectangle.getHeight(), (int)roundRectangle.getArcWidth(), (int)roundRectangle.getArcHeight());
        else if(freeDraw!=null && freeDraw.getSize()>=2)
            g.setColor(freeDraw.getColor());
            g.setStroke(stroke.getDrawingStrokeSize(freeDraw.getStrokeSize()));
            LinkedList tempPoints = freeDraw.getAllPoints();
            LinkedList allPoints = new LinkedList(tempPoints);
            if(allPoints.size()>=2)
                ListIterator it2 = allPoints.listIterator(0);
                ListIterator it3 = allPoints.listIterator(1); //must be one step ahead since two points are needed to draw
                while(it2.hasNext() && it3.hasNext())
                    Object ob2 = it2.next();
                    Object ob3 = it3.next();
                    if(ob2 instanceof Point)
                        Point p = (Point) ob2;
                        Point t = (Point) ob3;
                        g.drawLine(p.x, p.y, t.x, t.y);
        else if(polygon!=null && polygon.getStart()!=null && polygon.getStop()!=null)
            g.setColor(polygon.getColor());
            g.setStroke(stroke.getDrawingStrokeSize(polygon.getStrokeSize()));
            LinkedList temp = polygon.getAllLines();
            LinkedList linesList = new LinkedList(temp);
            ListIterator it2 = linesList.listIterator();
            while(it2.hasNext())
                MyLine tempLine = (MyLine) it2.next();
                g.drawLine((int)tempLine.getX1(), (int)tempLine.getY1(), (int)tempLine.getX2(), (int)tempLine.getY2());
            MyLine end = (MyLine) linesList.getLast();
            if(end!=null)
                g.drawLine((int)end.getX2(), (int)end.getY2(), (int)polygon.getStop().getX(), (int)polygon.getStop().getY());
        else if(text!=null && text.getStart()!=null)
            g.setColor(text.getColor());
            g.setFont(text.getFont());
            g.drawString(text.getText(), (int)text.getStart().getX(), (int)text.getStart().getY());
        g.dispose(); //release the copy of the graphics object
    }And here comes mouseDragged...(Not much of help maybe)
  public void mouseDragged(MouseEvent e)
        if(geometry==0 || geometry==3)
            freeDraw.mouseDragged(e);
            repaint();
        else if(geometry==1 || geometry==8)
            rectangle.mouseDragged(e);
            repaint();
         //   repaint((int)rectangle.getX(), (int)rectangle.getY(), (int)rectangle.getStop().getX(), (int)rectangle.getStop().getY());
        else if(geometry==2 || geometry==9)
            oval.mouseDragged(e);
            repaint();
        else if(geometry==4)
            line.mouseDragged(e);
            repaint();
        else if(geometry==6 || geometry==11)
            roundRectangle.mouseDragged(e);
            repaint();
    }

Answer 1

thanks!
advice nr.2 was good! good enough for 2 duke stars! :)
Looks better now (any more ways)?:
    public void paintComponent(Graphics gx)
        super.paintComponent(gx);
        Graphics2D g = (Graphics2D) gx.create();  //make a copy of the graphics object
        LinkedList listOfDrawingObjects = controller.getListOfDrawingObjects();
        LinkedList currentDrawingObjects = new LinkedList(listOfDrawingObjects); //make a copy to avoid ConcurrentModificationException
        ListIterator it = currentDrawingObjects.listIterator();
        while(it.hasNext())
            DrawingObject ob = (DrawingObject) it.next();
            ob.paint(g);
        if(rectangle!=null && rectangle.getStart()!=null && rectangle.getStop()!=null)
            rectangle.paint(g);
        else if(oval!=null && oval.getStart()!=null && oval.getStop()!=null)
            oval.paint(g);
        else if(line!=null && line.getStart()!=null && line.getStop()!=null)
            line.paint(g);
        else if(roundRectangle!=null && roundRectangle.getStart()!=null && roundRectangle.getStop()!=null)
            roundRectangle.paint(g);
        else if(freeDraw!=null && freeDraw.getSize()>=2)
            freeDraw.paint(g);
        else if(polygon!=null && polygon.getStart()!=null && polygon.getStop()!=null)
            polygon.paint(g);
        else if(text!=null && text.getStart()!=null)
            text.paint(g);
        g.dispose(); //release the copy of the graphics object
     }Message was edited by:
CbbLe
Message was edited by:
CbbLe