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Re: Image rotation part 2

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On Tuesday, June 30, 2015 at 12:56:43 PM UTC-4, Martin Gregorie wrote:
> Thanks to help from Knute about five 11 months ago I was able to create 
> JLabel subclasses that could display vertically aligned text, e.g.
> 
>    N
>    a
>    m
>    e
> 
> by using HTML text, e.g. "<html>N<br>a<br>m<br>e</html>" This works well, 
> except that some of the longer names create very tall instances that use 
> up more screen than I can really spade (the row of names is near the top 
> of a matrix which has 50+ lines below it, so it would be nice to avoid as 
> much scrolling up and down as possible. 
> 
> Having noticed that most Monospaced characters are just over half as wide 
> as they are high, 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);
>    AffineTransformOp aop = new AffineTransformOp(at,
>                                AffineTransformOp.TYPE_BILINEAR);
>    aop.filter(im, om);
> 
> I've also tried setting the AffineTransformOp to TYPE_BICUBIC but that 
> also gave a black rectangle.
> 
> I'm obviously doing something stupid or have missed out a vital step, but 
> what?
> 
> 
> -- 
> martin@   | Martin Gregorie
> gregorie. | Essex, UK
> org       |

Are you trying to rotate text or an image?
Which direction is the original?  Which direction did you need it to face after rotating?
To rotate an image I just create a new AffineTransform, scale it, rotate it, and pass it into my drawImage method.
If it's a perfect square the rotate method should be easy, just pass in the Math.toRadians(drawRotationAngle).
If it's a rectangle, not a square, and you want to turn it 90 degrees and squish it to fit the same space you need to calculate a new x/y.

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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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