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imagerotate problem with PHP 4.3.9 - PHP 5.2.0 using GD2

Recap:

Using imagerotate within PHP 4.3.9 - PHP 5.2.0 for both XP and Linux,
all using GD2

If you rotate an image 180 degrees, all is fine

If you rotate an image 0 degrees and < 180 degrees, or 180 degrees
and < 360 degrees, while the image will rotate, its dimensions are
somehow not refactored and as a result you get a rather annoying black
bar in the newly-rotated image, along with part of your image being
cropped off.

I learned about a possible workaround with ImageMagick's convert
command, but has anyone found a better solution (other than using XP's
built-in image rotation routines)?

Thanks
Phil

Jun 20 '07 #1
4 2383
Rik
On Wed, 20 Jun 2007 15:45:03 +0200, comp.lang.php
<ph**************@gmail.comwrote:
Recap:

Using imagerotate within PHP 4.3.9 - PHP 5.2.0 for both XP and Linux,
all using GD2

If you rotate an image 180 degrees, all is fine

If you rotate an image 0 degrees and < 180 degrees, or 180 degrees
and < 360 degrees, while the image will rotate, its dimensions are
somehow not refactored and as a result you get a rather annoying black
bar in the newly-rotated image, along with part of your image being
cropped off.

I learned about a possible workaround with ImageMagick's convert
command, but has anyone found a better solution (other than using XP's
built-in image rotation routines)?
Depends on what you want from it, how would you like it to behave on
arbitrary angle? Calculate the width & height needed for the new image,
create that, set the backgroundcolor of your choice on it, and paste the
image in it & rotate.
--
Rik Wasmus
Jun 20 '07 #2
On Jun 20, 10:02 am, Rik <luiheidsgoe...@hotmail.comwrote:
On Wed, 20 Jun 2007 15:45:03 +0200, comp.lang.php

<phillip.s.pow...@gmail.comwrote:
Recap:
Using imagerotate within PHP 4.3.9 - PHP 5.2.0 for both XP and Linux,
all using GD2
If you rotate an image 180 degrees, all is fine
If you rotate an image 0 degrees and < 180 degrees, or 180 degrees
and < 360 degrees, while the image will rotate, its dimensions are
somehow not refactored and as a result you get a rather annoying black
bar in the newly-rotated image, along with part of your image being
cropped off.
I learned about a possible workaround with ImageMagick's convert
command, but has anyone found a better solution (other than using XP's
built-in image rotation routines)?

Depends on what you want from it, how would you like it to behave on
arbitrary angle? Calculate the width & height needed for the new image,
create that, set the backgroundcolor of your choice on it, and paste the
image in it & rotate.
I did that after imagerotate misbehaved the first time, however, it
seems as if imagerotate ignored the newly-calculated height and weight
options.

Say for instance you have an image of 300 x 150. If you rotate 90
degrees the image should be 150 x 300 with the image contents
perfectly rotated. Instead you have an image of 150 x 300 with a big
black bar on the right. This in spite of recalculating the correct
height and width for the new image.
>
--
Rik Wasmus- Hide quoted text -

- Show quoted text -

Jun 20 '07 #3
Here is a visual example of what I mean.

Here is my original image:

http://valsignalandet.com/images/testshot.jpg

After I do this:
PHP Code:
if (!function_exists('imagerecreatetruecolor')) {
/**
* Recreate an existing image as a true color image {@link
http://us2.php.net/manual/en/functio...tate.php#62530 See notes
in imagerotate() for more information}
*
* @access public
* @param resource $image (reference)
* @return resource $image
*/
function &imagerecreatetruecolor(&$image) {
if (!imageistruecolor($image) &&
function_exists('imagecreatetruecolor')) {
list($width, $height) = array(@imagesx($image), @imagesy($image));
$tempImage = @imagecreatetruecolor($width, $height);
@imagecopy($tempImage, $image, 0, 0, 0, 0, $width, $height);
$image = $tempImage;
}
return $image;
}
}
/
*------------------------------------------------------------------------
---------------------------------------------------------------------------
Block to perform actions based upon checks. If you are to add text
you
will do a "imagefttext" function call;
if you are to add a border you will instantiate an
ImageBorderGenerator
class object; if you are to grayscale the
image you are to use the "imagecopymergegray" command ** and not
imagecopyresampled **
--------------------------------------------------------------------------
---------------------------------------------------------------------------
*/
// NOTE THAT NEGATIVE NUMBERS GO CLOCKWISE IN imagerotate(), I PREFER
NEGATIVE GO COUNTERCLOCKWISE AND POSITIVE GO CLOCKWISE
if ($this->isSuccessful && $image && isset($angle) &&
is_numeric($angle))
$image = @imagerotate(imagerecreatetruecolor($image), -1 * $angle,
0); // ROTATE IMAGE

Here is your resulting image:

http://valsignalandet.com/images/testshot2.jpg

That might make it a bit more clear as far as what I mean by the
"black
bar".

On Jun 20, 10:32 am, "comp.lang.php" <phillip.s.pow...@gmail.com>
wrote:
On Jun 20, 10:02 am, Rik <luiheidsgoe...@hotmail.comwrote:


On Wed, 20 Jun 2007 15:45:03 +0200, comp.lang.php
<phillip.s.pow...@gmail.comwrote:
Recap:
Using imagerotate within PHP 4.3.9 - PHP 5.2.0 for both XP and Linux,
all using GD2
If you rotate an image 180 degrees, all is fine
If you rotate an image 0 degrees and < 180 degrees, or 180 degrees
and < 360 degrees, while the image will rotate, its dimensions are
somehow not refactored and as a result you get a rather annoying black
bar in the newly-rotated image, along with part of your image being
cropped off.
I learned about a possible workaround with ImageMagick's convert
command, but has anyone found a better solution (other than using XP's
built-in image rotation routines)?
Depends on what you want from it, how would you like it to behave on
arbitrary angle? Calculate the width & height needed for the new image,
create that, set the backgroundcolor of your choice on it, and paste the
image in it & rotate.

I did that after imagerotate misbehaved the first time, however, it
seems as if imagerotate ignored the newly-calculated height and weight
options.

Say for instance you have an image of 300 x 150. If you rotate 90
degrees the image should be 150 x 300 with the image contents
perfectly rotated. Instead you have an image of 150 x 300 with a big
black bar on the right. This in spite of recalculating the correct
height and width for the new image.


--
Rik Wasmus- Hide quoted text -
- Show quoted text -- Hide quoted text -

- Show quoted text -- Hide quoted text -

- Show quoted text -

Jun 22 '07 #4
GOT IT!!!

if (!function_exists('imagerecreatetruecolor')) {
/**
* Recreate an existing image as a true color image {@link
http://us2.php.net/manual/en/functio...tate.php#62530 See notes
in imagerotate() for more information}
*
* @access public
* @param resource $image (reference)
* @param boolean $willRotate (default false)
* @param int $angle (default 0)
* @return resource $image
*/
function &imagerecreatetruecolor(&$image, $willRotate = false, $angle
= 0) {
if (!imageistruecolor($image) &&
function_exists('imagecreatetruecolor')) {
if ($willRotate && (($angle 0 && $angle < 180) || ($angle >
180 && $angle < 360))) {
list($width, $height) = array(@imagesy($image), @imagesx($image));
} else {
list($width, $height) = array(@imagesx($image), @imagesy($image));
}
$tempImage = @imagecreatetruecolor($width, $height);
@imagecopy($tempImage, $image, 0, 0, 0, 0, $width, $height);
$image = $tempImage;
}
return $image;
}
}

// NOTE THAT NEGATIVE NUMBERS GO CLOCKWISE IN imagerotate(), I PREFER
NEGATIVE GO COUNTERCLOCKWISE AND POSITIVE GO CLOCKWISE
if ($this->isSuccessful && $image && isset($angle) &&
is_numeric($angle)) $newImage = $image =
@imagerotate(imagerecreatetruecolor($image, 'willRotate', $angle), -1
* $angle, 0); // ROTATE IMAGE

On Jun 20, 9:45 am, "comp.lang.php" <phillip.s.pow...@gmail.com>
wrote:
Recap:

Using imagerotate within PHP 4.3.9 - PHP 5.2.0 for both XP and Linux,
all using GD2

If you rotate an image 180 degrees, all is fine

If you rotate an image 0 degrees and < 180 degrees, or 180 degrees
and < 360 degrees, while the image will rotate, its dimensions are
somehow not refactored and as a result you get a rather annoying black
bar in the newly-rotated image, along with part of your image being
cropped off.

I learned about a possible workaround with ImageMagick's convert
command, but has anyone found a better solution (other than using XP's
built-in image rotation routines)?

Thanks
Phil
Jun 23 '07 #5

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