CODEWITHSUNDEEP
javaswing
Ivan Cern
Ivan Cern

Reputation: 41

Random output Image in JFrame

As you may have noticed a question I already asked.

But the problems as soon as I apply random. as you have advised me.That's what I get as a result:

https://www.youtube.com/watch?v=EELo_-eh3fA

That is when I use random images begin to jump around the screen.

Here is a code I use:

int x = (int) (Math.random() * 290);
        int y = (int) (Math.random() * 290);
        g.drawImage(image, x,y,32,32, null);

How can I make sure that images are not jumping. I need pictures to be displayed randomly on the screen and remained on the spot!

Upvotes: 0

Views: 138

Answers (1)

MadProgrammer
MadProgrammer

Reputation: 347234

Painting may occur for any number of reasons, not just when you want it.

Each time paint is called, it is responsible for rebuilding the entire graphical content. Basically what is happening, you are assigning a new random position to the image each time it is painted.

Instead, create a reference to something like a Point and use it each time paint is called again.

Based on you previous example, you should not be overriding paint, but instead should be using paintComponent and you MUST call super.paintComponent to ensure that the Graphics context is updated correctly, this especially important when dealing with JComponent as it is transparent

Upvotes: 1

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