Re: [PHP] TrueType font changes size when rotated?
On Thu, April 26, 2007 7:14 am, Tijnema ! wrote: On 4/26/07, Richard Lynch [EMAIL PROTECTED] wrote: On Wed, April 25, 2007 3:33 pm, Seth Price wrote: I downloaded your image, enlarged it, and measured it out in photoshop. The distance from the center to the left side is 131px, and center to right side is 129px. Diameter to top is 129px, and to bottom is 130px. While it may not be an obvious ellipse, it's enough to throw off my calculations. Enlarged it how? I guess he meant to zoom, so that he could actually count the pixels :) Same smell. Once you do zoom counting pixels will never be exact. The zoom function had to deal with rounding errors and chose to either add a pixel or not. -- Some people have a gift link here. Know what I want? I want you to buy a CD from some indie artist. http://cdbaby.com/browse/from/lynch Yeah, I get a buck. So? -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] TrueType font changes size when rotated?
On 4/27/07, Richard Lynch [EMAIL PROTECTED] wrote: On Thu, April 26, 2007 7:14 am, Tijnema ! wrote: On 4/26/07, Richard Lynch [EMAIL PROTECTED] wrote: On Wed, April 25, 2007 3:33 pm, Seth Price wrote: I downloaded your image, enlarged it, and measured it out in photoshop. The distance from the center to the left side is 131px, and center to right side is 129px. Diameter to top is 129px, and to bottom is 130px. While it may not be an obvious ellipse, it's enough to throw off my calculations. Enlarged it how? I guess he meant to zoom, so that he could actually count the pixels :) Same smell. Once you do zoom counting pixels will never be exact. The zoom function had to deal with rounding errors and chose to either add a pixel or not. Did you ever used zoom in Adobe Photoshop CS3? You can zoom until the pixels are about 1CM on the screen. If you still are going to tell me that it would differ if there was to add a pixel or not. Didn't checked with photoshop either, but i there's a good chance that the OP is true. As he is using photoshop. Tijnema -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] TrueType font changes size when rotated?
On 4/26/07, Richard Lynch [EMAIL PROTECTED] wrote: On Wed, April 25, 2007 3:33 pm, Seth Price wrote: I downloaded your image, enlarged it, and measured it out in photoshop. The distance from the center to the left side is 131px, and center to right side is 129px. Diameter to top is 129px, and to bottom is 130px. While it may not be an obvious ellipse, it's enough to throw off my calculations. Enlarged it how? I guess he meant to zoom, so that he could actually count the pixels :) As soon as you scale an image, rounding errors are introduced... Take his source, maybe with a font 10 X bigger, and then using imagecolorat to examine each pixel in the original, and see if it's off... And, really, if drawing text with a 1-pixel error margin throws you off, you're in trouble anyway... It just shouldn't be like that :) Though the super dark 90-degree text versus the others with much larger variations in length is disconcerting, in your image, if those length calculations are correct... Still, it has probably nothing to do with PHP, as PHP is just using the GD library Tijnema -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] TrueType font changes size when rotated?
At 2:14 PM +0200 4/26/07, Tijnema ! wrote: On 4/26/07, Richard Lynch [EMAIL PROTECTED] wrote: On Wed, April 25, 2007 3:33 pm, Seth Price wrote: I downloaded your image, enlarged it, and measured it out in photoshop. The distance from the center to the left side is 131px, and center to right side is 129px. Diameter to top is 129px, and to bottom is 130px. While it may not be an obvious ellipse, it's enough to throw off my calculations. And, really, if drawing text with a 1-pixel error margin throws you off, you're in trouble anyway... It just shouldn't be like that :) Yeah, in a prefect world it would be. But I think Seth, as well as the people he reported the bug to, are going to find that while we can compute exactly what any measurement should be, we also have to pass it through the user's browser and user's monitor to display it. I don't even want to get into how the various browsers display data, let alone how different monitors might. The combinations here are staggering. Granted, the OP is using a Mac and that comes as close as most can be, but even Apple's standards have been influenced by M$ (another OT subject). However, I'm actually surprised that the error was as small as it was -- we're talking about less than 0.5 percent by using his measurements. Also, please note that if you move the center of the image a single pixel to the lower-left, then the error is only a single pixel in one direction. Who's to say that the OP did not realize nor use where zero-zero actually was? I seem to recall that when one has to make a decision as to where a pixel is placed, we use the lower left corner as the coordinates and not the center of the pixel -- similar as we do for displaying characters -- is that not correct? In any event, if it were me, I would use the center of the locus of points to calculate error. Cheers, tedd -- --- http://sperling.com http://ancientstones.com http://earthstones.com -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] TrueType font changes size when rotated?
At 10:26 PM -0500 4/24/07, Seth Price wrote: Hi all! I've been programming GD and PHP for a while, but I haven't done much with font drawing. I'm trying to layout and draw text, but the text actually changes size and shape depending on the angle it's drawn at. This is making it extremely difficult to lay the text out properly. Am I doing something wrong? Is there a bug in FreeType? How can I consistently draw text? For example: The following code draws 'Hello world' at differing angles. But all drawings are at right angles to each other. FreeType shouldn't even need to do any resampling or interpolating, but each text is drawn with a unique length and look. You can see the output of the following code here: http://leopold.sage.wisc.edu/test2.php Seth: Everything looks fine to me. On my browser all the text is the same size (I measured it). But then again, I'm using Safari for the Mac. Maybe it's a browsers problem. Cheers, tedd -- --- http://sperling.com http://ancientstones.com http://earthstones.com -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] TrueType font changes size when rotated?
I'm using Safari for Mac also. What are the numbers after 'Hello world' coming out for you? ~Seth On Apr 25, 2007, at 11:05 AM, tedd wrote: At 10:26 PM -0500 4/24/07, Seth Price wrote: Hi all! I've been programming GD and PHP for a while, but I haven't done much with font drawing. I'm trying to layout and draw text, but the text actually changes size and shape depending on the angle it's drawn at. This is making it extremely difficult to lay the text out properly. Am I doing something wrong? Is there a bug in FreeType? How can I consistently draw text? For example: The following code draws 'Hello world' at differing angles. But all drawings are at right angles to each other. FreeType shouldn't even need to do any resampling or interpolating, but each text is drawn with a unique length and look. You can see the output of the following code here: http://leopold.sage.wisc.edu/test2.php Seth: Everything looks fine to me. On my browser all the text is the same size (I measured it). But then again, I'm using Safari for the Mac. Maybe it's a browsers problem. Cheers, tedd -- --- http://sperling.com http://ancientstones.com http://earthstones.com -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] TrueType font changes size when rotated? (the plot thickens)
So I've rewritten my script in C. You can find the source here:
http://leopold.sage.wisc.edu/testing/gd_ft_ang.c
This script links directly to GD and produces a still different
output. On my home system, the output image is correct and the length
89 px. On the web server, the output image is not correct, but a bit
more consistent than the output from PHP. You can see it here:
http://leopold.sage.wisc.edu/testing/gd35_ft15.3.png
What is the difference between my home system and the web server? The
web server is running the most current versions, but my home system
is not. So, that's odd. Could some of you with GD and FreeType
installed take a look at my source code and see if my output image
matches yours?
To help eliminate variables, you can download a copy of the font file
I'm using here:
http://leopold.sage.wisc.edu/testing/Verdana.ttf
It sounds like this may be a bug in GD or FreeType.
Thanks,
Seth
On Apr 25, 2007, at 12:29 AM, jekillen wrote:
On Apr 24, 2007, at 8:26 PM, Seth Price wrote:
Hi all! I've been programming GD and PHP for a while, but I haven't
done much with font drawing. I'm trying to layout and draw text, but
the text actually changes size and shape depending on the angle it's
drawn at. This is making it extremely difficult to lay the text out
properly.
Am I doing something wrong? Is there a bug in FreeType? How can I
consistently draw text?
For example:
The following code draws 'Hello world' at differing angles. But all
drawings are at right angles to each other. FreeType shouldn't even
need to do any resampling or interpolating, but each text is drawn
with a unique length and look. You can see the output of the
following code here:
http://leopold.sage.wisc.edu/test2.php
?php
header('Content-Type:image/png');
$img = imagecreatetruecolor(300, 300);
$bak = imagecolorexact($img, 255,255,255);
imagefill($img, 0,0, $bak);
$col = imagecolorexact($img, 0,0,0);
for($i = 0; $i 360; $i += 90){
$b = imageftbbox(12, $i, '/Library/WebServer/Verdana.ttf', 'Hello
world');
$len = sqrt(($b[2] - $b[0])*($b[2] - $b[0]) + ($b[3] - $b[1])*(($b
[3] - $b[1])));
imagefttext($img, 12, $i, 150, 150, $col, '/Library/WebServer/
you're using Mac OSX, did you have to install gd or does it now
come with
gd included in the php installation? (after looking further down
the message,
I see you are running Server, so that is probably the difference)
Mine did not (OSX 1.4x). I have it installed on a FreeBSD system.
www.brushandbard.com - web design - dynamic image generation
demonstration
and Word Wise the Tile Puzzle are some of my projects using gd.
Verdana.ttf', 'Hello world '.$len);
}
imagepng($img);
?
When using more interesting fonts, this 'resampling' is causing text
drawn at 90 deg to look fugly. What can I do to prevent this? Is this
a known issue? The output doesn't seem to change if I use the 'ttf'
functions vs. the 'ft' functions.
I went looking for some samples, as I have played with this some in
the
past, but did not find anything current to show. I do not remember
having
this problem. There may be a distortion that is being entered into
the mix
when the fonts are rendered by your code. $len is the hypoteneus of a
right triangle, right off hand I would say that is your problem or
some of it.
The length should be a linear measurement and not a diagonal
measurement.
But I am rusty at this point. Also there is a function for
explicitly specifying
the angle of the font in degrees, and, as I remember the angle of the
rendering box also. This is so each font can be rendered at an
individual
angle and the whole enclosing box, so the whole word is rotated.
you will have to look in the manual for gd related functions if
you are
not aware of this.
Jeff K
System info:
Mac v10.4 Server running PHP v5.2.1 FreeType v2.3.4
Compiled with:
'./configure' '--with-apxs' '--with-mysqli=/usr/local/mysql/bin/
mysql_config' '--with-gd' '--with-png-dir=/usr/local' '--with-zlib-
dir=/usr' '--with-jpeg-dir=/usr/local' '--disable-short-tags' '--
with-
iconv' '--enable-exif' '--enable-mbstring' '--enable-gd-native-ttf'
'--with-freetype-dir=/usr/local'
Thanks,
Seth
--
PHP General Mailing List (http://www.php.net/)
To unsubscribe, visit: http://www.php.net/unsub.php
--
PHP General Mailing List (http://www.php.net/)
To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] TrueType font changes size when rotated?
Yep, I'm calculating the length from the returned bounding box and printing it out. The box seems to randomly expand and shrink depending on the angle. ~Seth ~Seth: I think it's your calculation of the bounding box that's throwing you off -- maybe round off errors -- I don't know. However, I don't see any difference in the length of the text. The following shows Hello World . at one degree increments over 360 degrees. http://sperling.com/a/font/ It looks like a circle to me. If there was a difference, then it would be elliptical. Cheers, tedd -- --- http://sperling.com http://ancientstones.com http://earthstones.com -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] TrueType font changes size when rotated?
I downloaded your image, enlarged it, and measured it out in photoshop. The distance from the center to the left side is 131px, and center to right side is 129px. Diameter to top is 129px, and to bottom is 130px. While it may not be an obvious ellipse, it's enough to throw off my calculations. ~Seth On Apr 25, 2007, at 1:38 PM, tedd wrote: Yep, I'm calculating the length from the returned bounding box and printing it out. The box seems to randomly expand and shrink depending on the angle. ~Seth ~Seth: I think it's your calculation of the bounding box that's throwing you off -- maybe round off errors -- I don't know. However, I don't see any difference in the length of the text. The following shows Hello World . at one degree increments over 360 degrees. http://sperling.com/a/font/ It looks like a circle to me. If there was a difference, then it would be elliptical. Cheers, tedd -- --- http://sperling.com http://ancientstones.com http://earthstones.com -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] TrueType font changes size when rotated?
I've created a bug report and moved discussion to the GD bug tracker: http://bugs.libgd.org/?do=detailstask_id=76 On Apr 25, 2007, at 1:38 PM, tedd wrote: Yep, I'm calculating the length from the returned bounding box and printing it out. The box seems to randomly expand and shrink depending on the angle. ~Seth ~Seth: I think it's your calculation of the bounding box that's throwing you off -- maybe round off errors -- I don't know. However, I don't see any difference in the length of the text. The following shows Hello World . at one degree increments over 360 degrees. http://sperling.com/a/font/ It looks like a circle to me. If there was a difference, then it would be elliptical. Cheers, tedd -- --- http://sperling.com http://ancientstones.com http://earthstones.com -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] TrueType font changes size when rotated?
On Wed, April 25, 2007 1:38 pm, tedd wrote: Yep, I'm calculating the length from the returned bounding box and printing it out. The box seems to randomly expand and shrink depending on the angle. ~Seth ~Seth: I think it's your calculation of the bounding box that's throwing you off -- maybe round off errors -- I don't know. However, I don't see any difference in the length of the text. The following shows Hello World . at one degree increments over 360 degrees. http://sperling.com/a/font/ It looks like a circle to me. If there was a difference, then it would be elliptical. SPHPyrograph! -- Some people have a gift link here. Know what I want? I want you to buy a CD from some indie artist. http://cdbaby.com/browse/from/lynch Yeah, I get a buck. So? -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] TrueType font changes size when rotated?
On Wed, April 25, 2007 3:33 pm, Seth Price wrote: I downloaded your image, enlarged it, and measured it out in photoshop. The distance from the center to the left side is 131px, and center to right side is 129px. Diameter to top is 129px, and to bottom is 130px. While it may not be an obvious ellipse, it's enough to throw off my calculations. Enlarged it how? As soon as you scale an image, rounding errors are introduced... Take his source, maybe with a font 10 X bigger, and then using imagecolorat to examine each pixel in the original, and see if it's off... And, really, if drawing text with a 1-pixel error margin throws you off, you're in trouble anyway... Though the super dark 90-degree text versus the others with much larger variations in length is disconcerting, in your image, if those length calculations are correct... -- Some people have a gift link here. Know what I want? I want you to buy a CD from some indie artist. http://cdbaby.com/browse/from/lynch Yeah, I get a buck. So? -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] TrueType font changes size when rotated?
I've written the problem in C and linked it directly to GD, and the problem still occurs. Though the text is still the *most* random when using the PHP version of the library. For more info, see here: http://bugs.libgd.org/?do=detailstask_id=76 I'm not scaling the image, though, I'm rotating the font. And I'm doing it in such a way that the pixels don't need to be resampled to transform from one to the next. Something else, in the C version the problem goes away when the font size is 16. The example font that I'm using here is thrown off by 1-5 pixels, but the other font was thrown off more (5-15px). I think the problem is already partly fixed in the current version of GD (v2.0.35RC2). Only the first of the four samples is different. Now I just need to get PHP to compile with an external version of GD. ~Seth On Apr 25, 2007, at 6:30 PM, Richard Lynch wrote: On Wed, April 25, 2007 3:33 pm, Seth Price wrote: I downloaded your image, enlarged it, and measured it out in photoshop. The distance from the center to the left side is 131px, and center to right side is 129px. Diameter to top is 129px, and to bottom is 130px. While it may not be an obvious ellipse, it's enough to throw off my calculations. Enlarged it how? As soon as you scale an image, rounding errors are introduced... Take his source, maybe with a font 10 X bigger, and then using imagecolorat to examine each pixel in the original, and see if it's off... And, really, if drawing text with a 1-pixel error margin throws you off, you're in trouble anyway... Though the super dark 90-degree text versus the others with much larger variations in length is disconcerting, in your image, if those length calculations are correct... -- Some people have a gift link here. Know what I want? I want you to buy a CD from some indie artist. http://cdbaby.com/browse/from/lynch Yeah, I get a buck. So? -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] TrueType font changes size when rotated?
On Apr 24, 2007, at 8:26 PM, Seth Price wrote:
Hi all! I've been programming GD and PHP for a while, but I haven't
done much with font drawing. I'm trying to layout and draw text, but
the text actually changes size and shape depending on the angle it's
drawn at. This is making it extremely difficult to lay the text out
properly.
Am I doing something wrong? Is there a bug in FreeType? How can I
consistently draw text?
For example:
The following code draws 'Hello world' at differing angles. But all
drawings are at right angles to each other. FreeType shouldn't even
need to do any resampling or interpolating, but each text is drawn
with a unique length and look. You can see the output of the
following code here:
http://leopold.sage.wisc.edu/test2.php
?php
header('Content-Type:image/png');
$img = imagecreatetruecolor(300, 300);
$bak = imagecolorexact($img, 255,255,255);
imagefill($img, 0,0, $bak);
$col = imagecolorexact($img, 0,0,0);
for($i = 0; $i 360; $i += 90){
$b = imageftbbox(12, $i, '/Library/WebServer/Verdana.ttf', 'Hello
world');
$len = sqrt(($b[2] - $b[0])*($b[2] - $b[0]) + ($b[3] - $b[1])*(($b
[3] - $b[1])));
imagefttext($img, 12, $i, 150, 150, $col, '/Library/WebServer/
you're using Mac OSX, did you have to install gd or does it now come
with
gd included in the php installation? (after looking further down the
message,
I see you are running Server, so that is probably the difference)
Mine did not (OSX 1.4x). I have it installed on a FreeBSD system.
www.brushandbard.com - web design - dynamic image generation
demonstration
and Word Wise the Tile Puzzle are some of my projects using gd.
Verdana.ttf', 'Hello world '.$len);
}
imagepng($img);
?
When using more interesting fonts, this 'resampling' is causing text
drawn at 90 deg to look fugly. What can I do to prevent this? Is this
a known issue? The output doesn't seem to change if I use the 'ttf'
functions vs. the 'ft' functions.
I went looking for some samples, as I have played with this some in the
past, but did not find anything current to show. I do not remember
having
this problem. There may be a distortion that is being entered into the
mix
when the fonts are rendered by your code. $len is the hypoteneus of a
right triangle, right off hand I would say that is your problem or some
of it.
The length should be a linear measurement and not a diagonal
measurement.
But I am rusty at this point. Also there is a function for explicitly
specifying
the angle of the font in degrees, and, as I remember the angle of the
rendering box also. This is so each font can be rendered at an
individual
angle and the whole enclosing box, so the whole word is rotated.
you will have to look in the manual for gd related functions if you are
not aware of this.
Jeff K
System info:
Mac v10.4 Server running PHP v5.2.1 FreeType v2.3.4
Compiled with:
'./configure' '--with-apxs' '--with-mysqli=/usr/local/mysql/bin/
mysql_config' '--with-gd' '--with-png-dir=/usr/local' '--with-zlib-
dir=/usr' '--with-jpeg-dir=/usr/local' '--disable-short-tags' '--with-
iconv' '--enable-exif' '--enable-mbstring' '--enable-gd-native-ttf'
'--with-freetype-dir=/usr/local'
Thanks,
Seth
--
PHP General Mailing List (http://www.php.net/)
To unsubscribe, visit: http://www.php.net/unsub.php
--
PHP General Mailing List (http://www.php.net/)
To unsubscribe, visit: http://www.php.net/unsub.php
