Dynamic graphic programming (Animation)

Question

I am trying to code a simple animation like a moving circle. I have tried using getGraphics() and work with that but it's not dynamic and it's painted for just one time

So please help me and guide me to code a dynamic graphic program.

I mean for example defining a function and every time when it called, it draws a line on a label.

Please have a look at this answer [Ball Animation](http://stackoverflow.com/a/9852739/1057230) — nIcE cOw, Jul 21 '13 at 08:03
One more [example](http://stackoverflow.com/a/17586464/1057230), my personal favourite now a days by @MadProgrammer :-) — nIcE cOw, Jul 21 '13 at 08:15
1) For better help sooner, post an [SSCCE](http://sscce.org/). 2) Please add an upper case letter at the start of sentences. Also use a capital for the word I, and abbreviations and acronyms like JEE or WAR. This makes it easier for people to understand and help. — Andrew Thompson, Jul 21 '13 at 08:20
Here is an [SSCCE of dynamically changing an image](http://stackoverflow.com/a/10055306/418556), & [another one](http://stackoverflow.com/a/10628553/418556) & [another one](http://stackoverflow.com/a/11330719/418556).. — Andrew Thompson, Jul 21 '13 at 08:33

score 2 · Accepted Answer · answered Jul 21 '13 at 08:04

2

Here is how to make a growing rectangle:

public class MovingRectangle extends JPanel {
    private Timer timer = new Timer(500, new ActionListener() {
        public void actionPerformed(ActionEvent event) {
            rectWidth += 100;
            repaint();
        }
    };

    private int rectWidth = 100;

    public void paintComponent(Graphics g) {
         super.paintComponent(g);
         g.drawRect(0, 0, 100. rectWidth);
    }

    public void start() {
        timer.start();
    }

    public void stop() {
        timer.stop();
    }

    public void reset() {
        rectWidth = 100;
        repaint();
    }
}

answered Jul 21 '13 at 08:04

tbodt

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Your `drawRect(...)` contains `.`, in place of `,`. But why `100. rectWidth` – nIcE cOw Jul 21 '13 at 08:08
That problem is fixed – tbodt Jul 21 '13 at 08:09
thanks a lot!! solved!! but how do you use this class that you defined? – strings95 Jul 21 '13 at 08:17
Do you know anything about swing? Do you use an IDE? If so, which one? If you answer these questions, I would be happy to help. – tbodt Jul 21 '13 at 08:22
not much! i just recently studied about swing and i use eclipse! – strings95 Jul 21 '13 at 08:28
You have to create an instance of this class and add it to the frame's content pane. You'll understand what I mean once you understand swing. – tbodt Jul 21 '13 at 08:29
I would like to see the results – tbodt Jul 21 '13 at 08:41

score 1 · Answer 2 · answered Jul 21 '13 at 08:04

1

you should override the paintComponent(Graphic g). This method is called every time the repaint() is called, so you should periodic calling that method.

You should also set DoubleBuffering on true: setDoubleBuffered(true) It will prevent possible flicker of your animation

answered Jul 21 '13 at 08:04

Joris W

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There is no need to turn on double buffering. It is on by default. – tbodt Jul 21 '13 at 08:05

Dynamic graphic programming (Animation)

2 Answers2

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