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Thread: Graphics mayhem

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    Default Graphics mayhem

    How do you draw a rectangle around a whole bunch of components?

    Also, how do you draw a polygon?

    I tried creating a method called paint but it seems to be overriding another paint method and causing the graphics on my GUI to go haywire. What way do you add graphics without overriding the paint method?


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    Super Moderator helloworld922's Avatar
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    Default Re: Graphics mayhem

    To draw a rectangular outline:

    public void paint(Graphics g)
    {
        g.drawRect(x, y, width, height);
    }

    To draw a polygon outline:

    Polygon p = new Polygon();
    p.addPoint(x,y);
    // .. add as many points as you want
    // g is a Graphics object
    g.drawPolygon(p);

    To override the paint method safely:

    make sure you call the super class's paint method before you do any extra painting.

    public void paint(Graphics g)
    {
        super.paint(g);
        // your painting
    }

    In general, try to not override the paint method directly. See if you can override the paintComponent() method (make sure to call super.paintComponent() if the base class had some painting going on inside paintComponent()).

    For more information, see: Performing Custom Painting.

    Please pick the most appropriate category for your questions. It makes it easier for those answering your question to know what they should expect when reading the post, and also makes it easier for future users to easily find and use the knowledge provided.
    Last edited by helloworld922; August 9th, 2010 at 05:00 PM.

  3. The Following User Says Thank You to helloworld922 For This Useful Post:

    javapenguin (August 9th, 2010)

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    Administrator copeg's Avatar
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    Default Re: Graphics mayhem

    How do you draw a rectangle around a whole bunch of components?
    If you wish to just add a border around components, just set the border of the component and use one of the many BorderFactory static methods to create the border.This is much cleaner in that the border is taken into account when the components are laid out, whereas custom painting is done inside the component and anything inside may be drawn over the top of the border.

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