Java Development

[SunnyDee]

Hi,

I'm having trouble drawing a filled circle. Can anyone help? I'm trying to use graphics.fillEllipse(...) but I can't figure out what parameters will output a circle.

Thanks!

[bneeman · Accepted solution]

Assuming you have x,y for the circle's centre and r for radius.

The method takes 3 points, C, P, and Q.

Set C to the centre (x,y).

Offset P from the centre along the X-axis (x + r, y).

Offset Q from the centre along the Y-axis (x, y + r).

All together it should look something like this:

g.drawEclipse(x, y, x + r, y, x, y + r, 0, 360);

Cheers, Barak.

[Zeeshan0581]

Center points: x, y

Radius: radius

to draw a filled circle:

Graphics.fillArc(x, y, radius, radius, 0, 360);

if you want to just draw circle use:

 Graphics.drawArc(x, y, radius, radius, 0, 360);

[Rajat_10Sep]

Hi,

    Please find below for drawing circle

    class TreeComponentScreen extends FullScreen{

                     TreeComponentScreen() {   
                                  drawComponent();
                       }

                      public void drawComponent(){
                                  HorizontalFieldManager hfm1 = new HorizontalFieldManager();

                                  add(hfm1);

                       }

                      protected void paint(Graphics graphics){
                                 graphics.drawEllipse(getWidth()/2,getHeight()/2,50 + 30,50,50,50 + 30,0,360);
                                 super.paint(graphics);
                       }

       }

just alter the parameter 3,4,5,6 in the function drawEllipse() according to your requirement.

Let me know if you have any query.

Regards,

Rajat Gupta.

---

If your problem was get solved then please mark the thread as "Accepted solution" and kudos - your wish

Message Edited by Rajat_10Sep on 02-26-2009 08:03 AM

[bbman]

Hi, I tried the solutions posted above but it doesn't work for me. I really really need to make a record button that is a circle in order to live. I tried implementing all three replies, and I think the snippet of code below should work but it doesn't. I add the button to the manager, but all it displays is an empty rounded rectangle in the middle with black color. If I set a border to the button, then I'll have a small vertical strip constructed by the border, but still empty button. I also tried instantiating the button with a label, and I ended up having a rectangle button with a small cropped red dot in the corner.

Any help please, I don't know how the second reply is the solution... does it not work with ButtonField? Much much thanks in advance

private ButtonField _pushToRec = new ButtonField(ButtonField.FIELD_HCENTER | DrawStyle.ELLIPSIS){
           
            protected void paint(Graphics _g){
              
                int x = getWidth()/2;
                int y = getHeight()/2;
                _g.setColor(Color.RED);
                _g.fillEllipse(x,y,x + 20,y,x,y + 20,0,360); 
                _g.setColor(Color.RED);
                _g.drawEllipse(x,y,x + 20,y,x,y + 20,0,360);            
                super.paint(_g);
            }
    };

[Rajat_10Sep]

Hi,

I think you are trying to make a button field which is circular in shape.

Have a look at this link

 http://www.blackberry.com/knowledgecenterpublic/livelink.exe/fetch/2000/348583/800332/800505/800345/...

[bbman]

Yes exactly, I want to make a button field in a circular shape and in color red. Are you saying that I can't instantiate a button field and try to make it circular by overriding its paint method? So I have to make my own custom field, and only then the paint method that I describe there will work to draw a circular shape field. Could you tell me if that paint method is correct to make a circle, though? It's just that the link you gave me doesn't really tell me if my method is correct or not. Thank you very much

[Rajat_10Sep]

Hi,

Yes that code will draw the the circle.

[bbman]

Yes!! I extended a field, and then pasted that paint method in it and it drew me a nice red circle Thanks so much Rajat