Groups > comp.lang.java.programmer > #31891

Re: Image rotation part 2

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From	Eric Sosman <esosman@comcast-dot-net.invalid>
Newsgroups	comp.lang.java.programmer
Subject	Re: Image rotation part 2
Date	Tue, 30 Jun 2015 14:03:17 -0400
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On 6/30/2015 12:55 PM, Martin Gregorie wrote:
> [...]I'm again thinking about somehow standing the character
> string on end by rotating it through 90 degrees. I'm successfully
> creating a JPG image containing black 10 pt Monospaced text on a
> LIGHT_GRAY background within a minimal window (20 pixels high and
> s.length() * (fontsize * 7 / 10) wide, whenever I try to rotate it, all
> I'm getting is a solid black image thats rotated so its longest dimension
> is now vertical.
>
> The code looks like this:
>
>     BufferedImage im = new BufferedImage(width,
>                                          height,
>                                          BufferedImage.TYPE_INT_RGB);
>
>     // image created in im
>
>     BufferedImage om = new BufferedImage(height,
>                                          width,
>                                          BufferedImage.TYPE_INT_RGB);
>     AffineTransform at = new AffineTransform();
>     at.setToQuadrantRotation(-1);

     This may be the problem: You're rotating the image a quarter-turn,
but not moving the origin.  I think that means you're rotating the
"payload" pixels clear out of the area that then fills the destination.
(Think about a closed door: After rotating it a quarter-turn about its
hinges, how much of the rotated door remains within the doorframe?)

-- 
esosman@comcast-dot-net.invalid
"Don't be afraid of work. Make work afraid of you." -- TLM

Thread

Image rotation part 2 Martin Gregorie <martin@address-in-sig.invalid> - 2015-06-30 16:55 +0000
  Re: Image rotation part 2 Eric Sosman <esosman@comcast-dot-net.invalid> - 2015-06-30 14:03 -0400
    Re: Image rotation part 2 Martin Gregorie <martin@address-in-sig.invalid> - 2015-06-30 20:04 +0000
      Re: Image rotation part 2 Eric Sosman <esosman@comcast-dot-net.invalid> - 2015-06-30 16:20 -0400
        Re: Image rotation part 2 Martin Gregorie <martin@address-in-sig.invalid> - 2015-06-30 20:52 +0000
  Re: Image rotation part 2 e.d.programmer@gmail.com - 2015-06-30 12:07 -0700
  Re: Image rotation part 2 Martin Gregorie <martin@address-in-sig.invalid> - 2015-06-30 20:18 +0000
  Re: Image rotation part 2 Jeff Higgins <jeff@invalid.invalid> - 2015-06-30 19:04 -0400
    Re: Image rotation part 2 Knute Johnson <nospam@rabbitbrush.frazmtn.com> - 2015-06-30 16:36 -0700
      Re: Image rotation part 2 Jeff Higgins <jeff@invalid.invalid> - 2015-06-30 20:17 -0400
    Re: Image rotation part 2 Jeff Higgins <jeff@invalid.invalid> - 2015-06-30 20:09 -0400
    Re: Image rotation part 2 e.d.programmer@gmail.com - 2015-07-01 06:06 -0700
      Re: Image rotation part 2 FredK <fred.l.kleinschmidt@gmail.com> - 2015-07-01 10:57 -0700
      Re: Image rotation part 2 Jeff Higgins <jeff@invalid.invalid> - 2015-07-01 18:13 -0400
      Re: Image rotation part 2 Arne Vajhøj <arne@vajhoej.dk> - 2015-07-27 22:28 -0400
        Re: Image rotation part 2 e.d.programmer@gmail.com - 2015-07-28 04:58 -0700
          Re: Image rotation part 2 Arne Vajhøj <arne@vajhoej.dk> - 2015-07-28 18:58 -0400
            Re: Image rotation part 2 e.d.programmer@gmail.com - 2015-07-29 05:35 -0700

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