Moving a circlewithin a rectangle

Question

Hi i am currently working on a gauge and have one such that a rectangle is filled with the fill method in paint with certain values passed to it .
I would like to now develop a new gauge whereas a filled circle or ball would move along the inside of the rectangle instead of it being filled with color
I should also state that some values here are run in a thread and just called in this draw method. The repaint is also in a thread hence gives the
effect that the guage is moving constantly
the following code represents my draw method to post all the classes here would be really alot so any help with the draw method is appreciated
public void draw(Graphics2D g) {
// set up variables to use
        g.translate(getX(),getY());
        int w = getWidth()/2;
        int h = getHeight();
        int totalRange = 100-0;
        int units = h/totalRange;
        int value = getICUMonitor().getDiaSensor().getDiastolic();
        int valueHeight = value*units;
        int valueY = h-valueHeight;
        // setup a gradient paint
        GradientPaint redtowhite = new GradientPaint(5, 5, Color.blue, 5, 5,Color.blue);
        g.setPaint(redtowhite);
        // drawing the actual rectangle
        g.setColor(Color.LIGHT_GRAY);
        g.draw(new Rectangle2D.Double(0,0,w,h));
        // filling the rectangle with a color
        g.fill(new Rectangle2D.Double(0,valueY,w,valueHeight));
        // this draws small lines along the side of the rectangle as markers
        for(int i=0;i<getHeight()+10;i+=10){
            g.drawLine((int)w+2,i,(int)w+6,i);
        // here is just putting the numbers 0 on the first marker and 100 on the last
        g.drawString("100",(int)w+14,0);
        g.drawString("0",(int)w+14,(int)getHeight());
        g.translate(getX()*-1,getY()*-1);
    }

Answer 1

I would like to now develop a new gauge whereas a filled circle or ball would move along the inside of the rectangle instead of it being filled with colorThis is really simple, you just have to replace your fill Rectangle call with a drawRect and fillOval calls.
g.drawRect(0, valueY, w, valueHeight);
g.fillOval(w/2-8, valueY, 16, 16);// drawing a circle of width 16 on the top middle of rectangleAnd yes SSCCE would be helpful, if your problem is not as simple as I thought.
Thanks!