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#### Why do imagettfbbox coordinates change when angle changes?

```Hi,

I'm using php 4.4.4. Maybe I'm misreading the docs, but in the
imagettfbbox manual (http://us2.php.net/imagettfbbox), it says that
text coordinates are the same regardless of what the angle is.  But I
am getting two distinct sets of coordinates if I change the angle from
zero to 270.

Here's the relevant code:

\$text = "hello";
\$s = getImageSize(\$img_file);
\$imgWidth = \$s[0];
\$imgHeight = \$s[1];
\$source=ImageCreateFromJPEG(\$img_file);
\$size=16;
\$black=imagecolorallocate(\$source,0,0,0);
\$font='/usr/share/fonts/msttcorefonts/times.ttf';
\$bbox=imagettfbbox(\$size,\$angle,\$font,\$text);
\$textWidth=\$bbox[2]-\$bbox[0];
\$textHeight=\$bbox[5]-\$bbox[3];
\$x=(\$imgWidth/2)-(\$textWidth/2);
\$y=(\$imgHeight/2)-(\$textHeight/2);
imagettftext(\$source,\$size,\$angle,\$x,\$y,\$black,\$font,\$text );

When I print out the bbox with 0, I get

Array ( [0] => -3 [1] => -1 [2] => 41 [3] => -1 [4] => 41 [5] => -16
[6] => -3 [7] => -16 )

with 270, I get

Array ( [0] => -13 [1] => -1 [2] => -13 [3] => 41 [4] => -1 [5] => 41
[6] => -1 [7] => -1 )

I must be misinterpreting the docs.  Why are the coordinates
different? - Dave
```
 0
3/13/2008 5:18:13 PM
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```On Thu, 13 Mar 2008 18:18:13 +0100, laredotornado@zipmail.com  =

> I'm using php 4.4.4. Maybe I'm misreading the docs, but in the
> imagettfbbox manual (http://us2.php.net/imagettfbbox), it says that
> text coordinates are the same regardless of what the angle is.

Nope

> But I
> am getting two distinct sets of coordinates if I change the angle from=

> zero to 270.
>
> Here's the relevant code:
>
>         \$text =3D "hello";
>         \$s =3D getImageSize(\$img_file);
>         \$imgWidth =3D \$s[0];
>         \$imgHeight =3D \$s[1];
>         \$source=3DImageCreateFromJPEG(\$img_file);
>         \$size=3D16;
>         \$black=3Dimagecolorallocate(\$source,0,0,0);
>         \$font=3D'/usr/share/fonts/msttcorefonts/times.ttf';
>         \$bbox=3Dimagettfbbox(\$size,\$angle,\$font,\$text);
>         \$textWidth=3D\$bbox[2]-\$bbox[0];
>         \$textHeight=3D\$bbox[5]-\$bbox[3];
>         \$x=3D(\$imgWidth/2)-(\$textWidth/2);
>         \$y=3D(\$imgHeight/2)-(\$textHeight/2);
>         imagettftext(\$source,\$size,\$angle,\$x,\$y,\$black,\$font,\$text );
>
> When I print out the bbox with 0, I get
>
> Array ( [0] =3D> -3 [1] =3D> -1 [2] =3D> 41 [3] =3D> -1 [4] =3D> 41 [5=
] =3D> -16
> [6] =3D> -3 [7] =3D> -16 )
>
> with 270, I get
>
> Array ( [0] =3D> -13 [1] =3D> -1 [2] =3D> -13 [3] =3D> 41 [4] =3D> -1 =
[5] =3D> 41
> [6] =3D> -1 [7] =3D> -1 )
>
> I must be misinterpreting the docs.  Why are the coordinates
> different? - Dave

"The points are relative to the text regardless of the angle , so "upper=
=

left" means in the top left-hand corner seeing the text horizontally."

Which means that with normal text without an angle, you have this box wi=
th  =

the array-indexes:
6,7---------4,5
|           |
0,1---------2,3

However, if you have an angle of 180 (text upside down), you see this  =

picture:
2,3---------0,1
|           |
4,5---------6,7

So, 0 & 1 hold the 'lower left corner IF you see the text horizontally' =
as  =

opposed to the 'lower left corner if you look at the picture'. The  =

coordinates WILL change if the angele changes (how could they not?), but=
=

the different indexes will be for the same relative position from the te=
xt  =

if you were to look at the image the way the text appears horizontal  =

again.  (Damned, this is far more easily explained face-to-face by just =
=

rotating a piece of paper...).
-- =

Rik Wasmus
```
 0
3/13/2008 5:31:59 PM
```Greetings, Rik Wasmus.

> (Damned, this is far more easily explained face-to-face by just
> rotating a piece of paper...).

QFT :D

Thanks BTW, I was about to use this function myself and You just saved me time
to uncover this info by my own trials and errors.

--
Sincerely Yours, AnrDaemon <anrdaemon@freemail.ru>

```
 0
anrdaemon (327)
4/2/2008 10:21:52 PM

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