imagerectangle
Shortly after posting I was informed about a very nice algorithm for calculating the new pixel position for a rotation and thought it would be a nice improvement. Hopes this helps anyone needing a full implementation.
Note: I tested the function on a 3Mb photo and it seemed to work perfectly with no quality loss.
<?php
if(!function_exists("imagerotate")) {
function imagerotate(&$srcImg, $angle, $transparentColor = null) {
$srcw = imagesx($srcImg);
$srch = imagesy($srcImg);
if($angle == 0) return $srcImg;
// Convert the angle to radians
$pi = 3.141592654;
$theta = $angle * $pi / 180;
// Get the origin (center) of the image
$originx = $srcw / 2;
$originy = $srch / 2;
// The pixels array for the new image
$pixels = array();
$minx = 0;
$maxx = 0;
$miny = 0;
$maxy = 0;
$dstw = 0;
$dsth = 0;
// Loop through every pixel and transform it
for($x=0;$x<$srcw;$x++) {
for($y=0;$y<$srch;$y++) {
list($x1, $y1) = translateCoordinate($originx, $originy, $x, $y, false);
$x2 = $x * cos($theta) - $y * sin($theta);
$y2 = $x * sin($theta) + $y * cos($theta);
// Store the pixel color
$pixels[] = array($x2, $y2, imagecolorat($srcImg, $x, $y));
// Check our boundaries
if($x2 > $maxx) $maxx = $x2;
if($x2 < $minx) $minx = $x2;
if($y2 > $maxy) $maxy = $y2;
if($y2 < $miny) $miny = $y2;
}
}
// Determine the new image size
$dstw = $maxx - $minx + 1;
$dsth = $maxy - $miny + 1;
// Create our new image
$dstImg = imagecreatetruecolor($dstw, $dsth);
// Fill the background with our transparent color
if($transparentColor == null) $transparentColor = imagecolorallocate($dstImg, 1, 2, 3);
imagecolortransparent($dstImg, $transparentColor);
imagefilledrectangle($dstImg, 0, 0, $dstw + 1, $dsth + 1, $transparentColor);
// Get the new origin
$neworiginx = -$minx;
$neworiginy = -$miny;
// Fill in the pixels
foreach($pixels as $data) {
list($x, $y, $color) = $data;
list($newx, $newy) = translateCoordinate($neworiginx, $neworiginy, $x, $y);
imagesetpixel($dstImg, $newx, $newy, $color);
}
return $dstImg;
}
/**
* Translates from mathematical coordinate system to computer coordinate system using
* origin coordinates from the computer system or visa versa
*
* @param int $originx
* @param int $originy
* @param int $x
* @param int $y
* @param bool $toComp
* @return array(int $x, int $y)
*/
function translateCoordinate($originx, $originy, $x, $y, $toComp=true) {
if($toComp) {
$newx = $originx + $x;
$newy = $originy - $y;
} else {
$newx = $x - $originx;
$newy = $originy - $y;
}
return array($newx, $newy);
}
}
?>
imagerotate
(PHP 4 >= 4.3.0, PHP 5)
imagerotate — Rotate an image with a given angle
Descripción
resource imagerotate
( resource $source_image
, float $angle
, int $bgd_color
[, int $ignore_transparent
] )
Rotates the source_image image using the given angle in degrees.
The center of rotation is the center of the image, and the rotated image is scaled down so that the whole rotated image fits in the destination image - the edges are not clipped.
Lista de parámetros
- source_image
-
The source image link
- angle
-
Rotation angle, in degrees.
- bgd_color
-
Specifies the color of the uncovered zone after the rotation
- ignore_transparent
-
If set and non-zero, transparent colors are ignored (otherwise kept).
Valores retornados
Registro de cambios
| Versión | Descripción |
|---|---|
| 5.1.0 | ignore_transparent was added. |
Ejemplos
Example #1 Rotate an image 180 degrees
This example rotates an image 180 degrees - upside down.
<?php
// File and rotation
$filename = 'test.jpg';
$degrees = 180;
// Content type
header('Content-type: image/jpeg');
// Load
$source = imagecreatefromjpeg($filename);
// Rotate
$rotate = imagerotate($source, $degrees, 0);
// Output
imagejpeg($rotate);
?>
El resultado del ejemplo seria algo similar a:
Notes
Note: Esta funcion esta disponible solamente si PHP se ha compilado con la version de las bibliotecas GD distribuidas con PHP.
add a note
User Contributed Notesimagerotate
pilot at myupb dot com
31-May-2008 02:23
31-May-2008 02:23
pilot at myupb dot com
30-May-2008 04:33
30-May-2008 04:33
Thanks to the people who contributed the code for the 90 180 and 270 rotations. I needed a full implementation however so I wrote one. By no mean do I think this is the best way of doing it, I just whipped this together for myself. Seems to work good for me.
Note: I didn't want the image to be shrunk when rotating so this implementation will keep the size of the original image but just rotate it.
if(!function_exists("imagerotate")) {
function imagerotate(&$srcImg, $angle, $transparentColor = null) {
$srcw = imagesx($srcImg);
$srch = imagesy($srcImg);
if($angle == 0) return $srcImg;
// Convert the angle to radians
$pi = 3.141592654;
$theta = $angle * $pi / 180;
// Get the origin (center) of the image
$originx = $srcw / 2;
$originy = $srch / 2;
// The pixels array for the new image
$pixels = array();
$minx = 0;
$maxx = 0;
$miny = 0;
$maxy = 0;
$dstw = 0;
$dsth = 0;
// Loop through every pixel and transform it
for($x=0;$x<$srcw;$x++) {
for($y=0;$y<$srch;$y++) {
list($x1, $y1) = translateCoordinate($originx, $originy, $x, $y, false);
$theta1 = 0;
$noTranslate = false;
// Determine the angle of original point
if($x1 > 0 && $y1 > 0) {
// Quadrant 1
$theta1 = atan($y1/$x1);
} elseif($x1 < 0 && $y1 > 0) {
// Quadrant 2
$theta1 = $pi - atan($y1/abs($x1));
} elseif($x1 < 0 && $y1 < 0) {
// Quadrant 3
$theta1 = $pi + atan($y1/$x1);
} elseif($x1 > 0 && $y1 < 0) {
// Quadrant 4
$theta1 = 2 * $pi - atan(abs($y1)/$x1);
} elseif($x1 == 0 && $y1 > 0) {
$theta1 = $pi / 2;
} elseif($x1 == 0 && $y1 < 0) {
$theta1 = 3 * $pi / 2;
} elseif($x1 > 0 && $y1 == 0) {
$theta1 = 0;
} elseif($x1 < 0 && $y1 == 0) {
$theta1 = $pi;
} else {
// Only case left should be $x1 == 0 && $y1 == 0
$noTranslate = true;
}
// Translate the position
if(!$noTranslate) {
// Calculate the new angle
$theta2 = $theta1 + $theta;
// Make sure theta2 is in between 0 - 2pi
while($theta2 < 0) $theta2 += 2 * $pi;
while($theta2 > (2 * $pi)) $theta2 -= 2 * $pi;
$radius = sqrt($x1*$x1 + $y1*$y1);
$x2 = ($radius * cos($theta2));
$y2 = ($radius * sin($theta2));
} else {
$x2 = $x1;
$y2 = $y1;
}
// Store the pixel color
$pixels[] = array($x2, $y2, imagecolorat($srcImg, $x, $y));
// Check our boundaries
if($x2 > $maxx) $maxx = $x2;
if($x2 < $minx) $minx = $x2;
if($y2 > $maxy) $maxy = $y2;
if($y2 < $miny) $miny = $y2;
}
}
// Determine the new image size
$dstw = $maxx - $minx + 1;
$dsth = $maxy - $miny + 1;
// Create our new image
$dstImg = imagecreatetruecolor($dstw, $dsth);
// Fill the background with our transparent color
if($transparentColor == null) $transparentColor = imagecolorallocate($dstImg, 1, 2, 3);
imagecolortransparent($dstImg, $transparentColor);
imagefilledrectangle($dstImg, 0, 0, $dstw + 1, $dsth + 1, $transparentColor);
// Get the new origin
$neworiginx = -$minx;
$neworiginy = -$miny;
// Fill in the pixels
foreach($pixels as $data) {
list($x, $y, $color) = $data;
list($newx, $newy) = translateCoordinate($neworiginx, $neworiginy, $x, $y);
imagesetpixel($dstImg, $newx, $newy, $color);
}
return $dstImg;
}
/**
* Translates from mathematical coordinate system to computer coordinate system using
* origin coordinates from the computer system or visa versa
*
* @param int $originx
* @param int $originy
* @param int $x
* @param int $y
* @param bool $toComp
* @return array(int $x, int $y)
*/
function translateCoordinate($originx, $originy, $x, $y, $toComp=true) {
if($toComp) {
$newx = $originx + $x;
$newy = $originy - $y;
} else {
$newx = $x - $originx;
$newy = $originy - $y;
}
return array($newx, $newy);
}
}
cjastram at gmail dot com
13-May-2008 04:31
13-May-2008 04:31
This function does not resize the image being rotated, as indicated by the phrase, "the rotated image is scaled down so that the whole rotated image fits in the destination image." The returned image resource is resized up so as to exactly fit the rotated source image.
For those using Ubuntu, if you have permission to access your PHP modules directory, you can snag a bundled php-gd.so from another distribution (such as Red Hat or Mandriva) and replace yours, and you should be good to go (I was). Remember, though, that the reason Ubuntu does not do this is because of security, so be responsible!
Dominik Scholz - info at HAM&SPAM dot go4u dot de
03-Apr-2008 07:23
03-Apr-2008 07:23
I took the previous mentioned code and optimized it a little bit. It does some speed improvements for me, but I did no exact measurements. Instead of decrementing by 1 in each cycle of the for-loops, I did the decrementing once before the loops. Maybe further improvements can be made...
<?php
if(!function_exists("imagerotate"))
{
function imagerotate($src_img, $angle)
{
$src_x = imagesx($src_img);
$src_y = imagesy($src_img);
if ($angle == 180)
{
$dest_x = $src_x;
$dest_y = $src_y;
}
elseif (($angle == 90) || ($angle == 270))
{
$dest_x = $src_y;
$dest_y = $src_x;
}
else
{
return $src_img;
}
$rotate=imagecreatetruecolor($dest_x,$dest_y);
imagealphablending($rotate, false);
switch ($angle)
{
case 270:
$dest_x--;
for ($y = 0; $y < $src_y; $y++)
for ($x = 0; $x < $src_x; $x++)
imagesetpixel($rotate, $dest_x - $y, $x, imagecolorat($src_img, $x, $y));
break;
case 90:
$dest_y--;
for ($y = 0; $y < $src_y; $y++)
for ($x = 0; $x < $src_x; $x++)
imagesetpixel($rotate, $y, $dest_y - $x, imagecolorat($src_img, $x, $y));
break;
case 180:
$dest_x--;
$dest_y--;
for ($y = 0; $y < $src_y; $y++)
for ($x = 0; $x < $src_x; $x++)
imagesetpixel($rotate, $dest_x - $x, $dest_y - $y, imagecolorat($src_img, $x, $y));
break;
}
return $rotate;
}
}
?>
achilles
01-Apr-2008 12:02
01-Apr-2008 12:02
otimized integration from 23-Feb-2007 04:21
just put it anywhere you like to use imagerotate with 90, 180, 270 degrees.
<?php
if(!function_exists("imagerotate")) {
function imagerotate($src_img, $angle) {
$src_x = imagesx($src_img);
$src_y = imagesy($src_img);
if ($angle == 180) {
$dest_x = $src_x;
$dest_y = $src_y; }
elseif ($src_x <= $src_y) {
$dest_x = $src_y;
$dest_y = $src_x; }
elseif ($src_x >= $src_y) {
$dest_x = $src_y;
$dest_y = $src_x; }
$rotate=imagecreatetruecolor($dest_x,$dest_y);
imagealphablending($rotate, false);
switch ($angle) {
case 270:
for ($y = 0; $y < ($src_y); $y++) {
for ($x = 0; $x < ($src_x); $x++) {
$color = imagecolorat($src_img, $x, $y);
imagesetpixel($rotate, $dest_x - $y - 1, $x, $color); }}
break;
case 90:
for ($y = 0; $y < ($src_y); $y++) {
for ($x = 0; $x < ($src_x); $x++) {
$color = imagecolorat($src_img, $x, $y);
imagesetpixel($rotate, $y, $dest_y - $x - 1, $color); }}
break;
case 180:
for ($y = 0; $y < ($src_y); $y++) {
for ($x = 0; $x < ($src_x); $x++) {
$color = imagecolorat($src_img, $x, $y);
imagesetpixel($rotate, $dest_x - $x - 1, $dest_y - $y - 1, $color); }}
break;
default: $rotate = $src_img; }
return $rotate; }}
?>
Anonymous
25-Oct-2007 10:36
25-Oct-2007 10:36
the solution barbarism at oscillatewildly dot com came up with to use -1 to preserve transparency apparently only works if you have PHP5 settings on your host.
(This took me 2 days to figure out. I hope I save someone else that time.)
My settings:
PHP Version: 5.2.2
GD Version: bundled (2.0.34 compatible)
Working in PHP5 Example:
<?php
$filename = 'picturewithtransparency.png';
$degrees = -90; // tilt it
header('Content-type: image/png');
$source = imagecreatefrompng($filename);
$rotate = imagerotate($source, $degrees, -1);
imagealphablending($rotate, true);
imagesavealpha($rotate, true);
imagepng($rotate);
?>
qrgames at NOSPAMTYrushyo dot com
12-Aug-2007 01:06
12-Aug-2007 01:06
imagerotate seems to be very fussy about handling transparency when copymerging onto another image. You can use the GD library's other transparency features to cover up the fact imagerotate gets it wrong HOWEVER it will only work if the top-left corner of the image is transparent at all rotations, so make the image a little bigger than it needs to be. This has been tested with png32 but does not work entirely for png8, as a phenomena creates noise around the rotated image.
<?php
$imgImage = imagecreatefrompng("image.png");
$colBlack = imagecolorallocate($imgImage, 0, 0, 0);
$imgImage = imagerotate($imgImage, 360 - $intHeading, 0);
imagefill($imgImage, 0, 0, $colBlack);
imagecolortransparent($imgImage, $colBlack);
imagecopymerge($imgOriginalImage , $imgImage, $intX, $intY, 0, 0, $intHeight, $intWidth, 100);
imagedestroy($imgImage);
?>
Note. $intHeading is in degrees clockwise :)
Thomaschaaf
23-Feb-2007 04:21
23-Feb-2007 04:21
function rotate($degrees)
{
if(function_exists("imagerotate"))
$this->image = imagerotate($this->image, $degrees, 0);
else
{
function imagerotate($src_img, $angle)
{
$src_x = imagesx($src_img);
$src_y = imagesy($src_img);
if ($angle == 180)
{
$dest_x = $src_x;
$dest_y = $src_y;
}
elseif ($src_x <= $src_y)
{
$dest_x = $src_y;
$dest_y = $src_x;
}
elseif ($src_x >= $src_y)
{
$dest_x = $src_y;
$dest_y = $src_x;
}
$rotate=imagecreatetruecolor($dest_x,$dest_y);
imagealphablending($rotate, false);
switch ($angle)
{
case 270:
for ($y = 0; $y < ($src_y); $y++)
{
for ($x = 0; $x < ($src_x); $x++)
{
$color = imagecolorat($src_img, $x, $y);
imagesetpixel($rotate, $dest_x - $y - 1, $x, $color);
}
}
break;
case 90:
for ($y = 0; $y < ($src_y); $y++)
{
for ($x = 0; $x < ($src_x); $x++)
{
$color = imagecolorat($src_img, $x, $y);
imagesetpixel($rotate, $y, $dest_y - $x - 1, $color);
}
}
break;
case 180:
for ($y = 0; $y < ($src_y); $y++)
{
for ($x = 0; $x < ($src_x); $x++)
{
$color = imagecolorat($src_img, $x, $y);
imagesetpixel($rotate, $dest_x - $x - 1, $dest_y - $y - 1, $color);
}
}
break;
default: $rotate = $src_img;
};
return $rotate;
}
$this->image = imagerotate($this->image, $degrees);
}
}
This one works better than the one below from the 12th February and if the faster function is available it will take that.
It is still not optimized but turning pictures works better..
crymsan
12-Feb-2007 11:44
12-Feb-2007 11:44
My php install does not have imagerotate (ubuntu). So, after fiddling with a few others I wrote my own code to rotate images in 90 degree increments. Any speed improvements would be great.
<?php
function imageRotate($src_img, $angle) {
$src_x = imagesx($src_img);
$src_y = imagesy($src_img);
if ($angle == 90 || $angle == -910) {
$dest_x = $src_y;
$dest_y = $src_x;
} else {
$dest_x = $src_x;
$dest_y = $src_y;
}
$rotate=imagecreatetruecolor($dest_x,$dest_y);
imagealphablending($rotate, false);
switch ($angle) {
case 90:
for ($y = 0; $y < ($src_y); $y++) {
for ($x = 0; $x < ($src_x); $x++) {
$color = imagecolorat($src_img, $x, $y);
imagesetpixel($rotate, $dest_x - $y - 1, $x, $color);
}
}
break;
case -90:
for ($y = 0; $y < ($src_y); $y++) {
for ($x = 0; $x < ($src_x); $x++) {
$color = imagecolorat($src_img, $x, $y);
imagesetpixel($rotate, $y, $dest_y - $x - 1, $color);
}
}
break;
case 180:
for ($y = 0; $y < ($src_y); $y++) {
for ($x = 0; $x < ($src_x); $x++) {
$color = imagecolorat($src_img, $x, $y);
imagesetpixel($rotate, $dest_x - $x - 1, $dest_y - $y - 1, $color);
}
}
break;
default: $rotate = $src_img;
};
return $rotate;
}
?>
cedric dot francoys at easy-cms dot org
07-Jan-2007 07:26
07-Jan-2007 07:26
note for this message : "I was having a problem with rotating a PNG. I used -1 for ignore_transparent and in Firefox the uncovered area was transparent but in IE it showed as grey.
The real problem is IE 6.0 does not support transparent PNGs. So don't blame the imagerotatefunction. I don't know about IE 7 though."
In fact, IE6 doesn't handle the transparency for 24 bits PNG images. But it does for 8 bits PNG. (This problem has been solved with IE7).
Meanwhile, even if the input image is a 8 bits one, the image returned by imagesrotate is a 24 bit one ... so IE6 wont correctly display it.
http://whitemarker.blogspot.com
04-Jan-2007 12:06
04-Jan-2007 12:06
I was having a problem with rotating a PNG. I used -1 for ignore_transparent and in Firefox the uncovered area was transparent but in IE it showed as grey.
The real problem is IE 6.0 does not support transparent PNGs. So don't blame the imagerotatefunction. I don't know about IE 7 though.
m dot quinton at gmail dot com
14-Sep-2006 06:30
14-Sep-2006 06:30
with large file, where imagerotate is missing, you can use, when possible "convert" command from ImageMagick. Here is a sample script.
<?php
error_reporting(E_ALL);
header("Content-type: image/png");
$file = 'images/test/imgp2498.jpg';
image_rotate_with_convert($file, 90);
function image_rotate_with_convert($file, $angle){
passthru("convert -rotate $angle $file -");
}
?>
barbarism at oscillatewildly dot com
18-Apr-2006 04:00
18-Apr-2006 04:00
If you pass "-1" into the last param of imagecreatefrompng, it preserves PNG transparently properly!
Exampe:
$filename = './documents/135.pdf.png';
$degrees = 40;
header('Content-type: image/png');
$source = imagecreatefrompng($filename);
$rotate = imagerotate($source, $degrees, -1);
imagealphablending($rotate, true);
imagesavealpha($rotate, true);
imagepng($rotate);
Longhair
13-Apr-2006 11:03
13-Apr-2006 11:03
<?
//KOMPASS //PHP4.0 //GD2
$wert=0; //0-360 degree
$null=46; //Offset
$bgcolor=0x0033CC;
$grad=$wert+$null;
$kompass=imagecreatefromjpeg("bilder/kompass_ohne.jpg");
$nadel=imagecreatefromjpeg("bilder/nadel_bleu.jpg");
$mov_nadel= imagerotate($nadel, $grad, $bgcolor);
$xKom=imagesx($kompass);
$yKom=imagesy($kompass);
$x2Kom=$xKom/2;
$y2Kom=$yKom/2;
$xNad=imagesy($mov_nadel);
$yNad=imagesy($mov_nadel);
$y2Nad=$yNad/2+$x2Kom-$yNad; //92/2=46 + 100-92
$x2Nad=$xNad/2+$y2Kom-$xNad;
imagecopy ( $kompass, $mov_nadel, $x2Nad, $y2Nad, 0, 0, $xNad, $xNad );
header("Content-type: image/jpg");
//wird als JEPG-Bild Ausgegeben
//imagepng($kompass);
imagejpeg($kompass);
//imagegif($nadel);
imagedestroy($nadel);
imagedestroy($kompass);
?>
gareth at crxchaos dot co dot uk
02-Mar-2006 04:19
02-Mar-2006 04:19
It's worth noting this function will only rotate true colour images - If you have a 256 colour pallet based image it will not rotate with this. Use the following code to convert the 256 colour image to truecolour first:
<?php
if (!imageistruecolor($im))
{
$w = imagesx($im);
$h = imagesy($im);
$t_im = imagecreatetruecolor($w,$h);
imagecopy($t_im,$im,0,0,0,0,$w,$h);
$im = $t_im;
}
?>
I have found no mention of this shortcoming of imagerotate anywhere on the Internet. Hopefully this will limit the number of people who, like me, are trying to troubleshoot a perfectly operation PHP install.
olav-x at volvo-power.net
18-Nov-2005 01:17
18-Nov-2005 01:17
I tried the example provided by 'jonathan AT sharpmedia DOT net', and that gave me strange rotations, with offset on the image.
I dont need an advanced rotation script like that, so I used his function wrapper and make a more simple edition.
ps. the code above the function is only for test-purpose.
I'll retrieve srcpic from the db.
the idea here, is that I'll store rotated thumbs of the original thumb. Then the user can click on the thumb which is "correctly rotated" and then the original file will be rotated.
I think I'll make some backup function implemented too!
the idea is that the rotated files will have _ROT<int>.ext
eg. if you rotate the file "bicycle.jpg" 1 rotation (90 degrees), it will be copied to: bicycle_ROT1.jpg, 180 degrees would be _ROT2.jpg, and so on.
There is only 3 rots, I should have removed the ROT0 here, as well as the code might need improvement.
However, I think that simple codes like this ones, are the easiest ones to use as a foundation, as they are - simple!
What you can improve, if you want to do this:
* there is a lot! however, you have to wrap the $dst in something like:
if (!isset($dst)) {
}
eg. so you can over-ride the "save to", when calling the function!
this is beta 0.0000001 however, so play with it, slaughter it, whatever.
good luck!
Olav Alexander Mjelde
<?php
// #### start of test
$srcpic = 'bilder/biler/_tmp/foo.jpg';
echo rotateImage($srcpic, $dstpic, 1, 100);
echo rotateImage($srcpic, $dstpic, 2, 100);
echo rotateImage($srcpic, $dstpic, 3, 100);
// #### end of test
// this function rotates an image
function rotateImage($src, $dst, $count = 1, $quality = 95)
{
if (!file_exists($src)) {
return false;
}
// generate output filename
extension
$dst = substr($src, 0, strrpos($src, ".")) . "_ROT" . $count . substr($src, strrpos($src, "."), strlen($src));
switch ($count) {
case 0:
$degrees = 0;
break;
case 1:
$degrees = 90;
break;
case 2:
$degrees = 180;
break;
case 3:
$degrees = 270;
break;
}
// Load
$source = imagecreatefromjpeg($src);
// Rotate
$rotate = imagerotate($source, 360 - $degrees, 0);
// Output
imagejpeg($rotate, $dst, $quality);
imageDestroy($rotate);
imageDestroy($source);
return true;
}
?>
simon_nuttall at hotmail dot com
27-Sep-2005 07:06
27-Sep-2005 07:06
The following is potentially useful. It extracts the central largest circle of an image into a square of specified size, and optionally rotates it. The rest of the square is made transparent, so useful for drawing over other images. I've named it after binocular effect because on some old TV shows whenever they show someone looking through binoculars the screen shows a big circular image with black edges.
<?php
function image_binocular_effect($src, $bearing, $out_square) {
// the source image is resampled to fit within the specified square, and rotated clockwise by bearing.
// the largest circle within the image is retained, the rest made transparent.
$out = imagecreatetruecolor($out_square, $out_square);
$width=imagesx($src);
$height=imagesy($src);
$square=min($width, $height);
imagecopyresampled($out, $src, 0, 0, ($width - $square)/2 , ($height - $square)/2, $out_square, $out_square, $square, $square);
$mask = imagecreatetruecolor($out_square, $out_square);
$black = ImageColorAllocate ($mask, 0, 0, 0);
$white = ImageColorAllocate ($mask, 255, 255, 255);
imagefilledrectangle($mask , 0, 0, $out_square, $out_square, $white);
$centrexy=$out_square / 2;
imagefilledellipse($mask, $centrexy, $centrexy, $out_square, $out_square, $black);
ImageColorTransparent($mask, $black);
imagecopymerge($out, $mask, 0, 0, 0, 0, $out_square, $out_square, 100);
if ($bearing != 0) {
$rotated_img=imagerotate($out , 360-$bearing, $white);
// take off only the rotated width
$rotated_map_width = imagesx($rotated_img);
$rotated_map_height = imagesy($rotated_img);
imagecopy($out, $rotated_img, 0, 0, ($rotated_map_width - $out_square) / 2, ($rotated_map_height - $out_square) / 2, $out_square, $out_square);
}
ImageColorTransparent($out, $white);
return $out;
}
// Create a sample image to demonstrate the effect, but looks much better on real photos.
$src = imagecreatetruecolor(200, 50);
imagefilledrectangle($src, 0, 0, 200, 50, imagecolorallocate($src, 255, 255, 255));
ImageString($src, 3, 10, 10, "This is a sample image to illustrate the binocular effect", imagecolorallocate($im, 192, 0, 0));
$img=image_binocular_effect($src, 72, 50);
ImagePNG($img,"test.png");
?>
kumm at webstar dot hu
22-Aug-2005 09:59
22-Aug-2005 09:59
A better bugfix for jonathan AT sharpmedia DOT net's rotateImage function
you need to replace:
// Now copy tmp2 to $out;
imagecopy($out, $tmp2, 0, 0, ($angle == 270 ? abs($w - $h) : 0), 0, $h, $w);
with:
// Now copy tmp2 to $out;
if ($h>$w) {
imagecopy($out, $tmp2, 0, 0, 0, ($angle == 90 ? abs($w - $h) : 0), $h, $w);
} else {
imagecopy($out, $tmp2, 0, 0, ($angle == 270 ? abs($w - $h) : 0), 0, $h, $w);
}
otherwise the image gets moved when rotating a standing up image
jmichel at faeryscape dot com
27-Apr-2005 08:56
27-Apr-2005 08:56
Imagerotate apparently destroy transparency information (transparent areas turn to black). For now the only walkaround I found is to use :
imagecolortransparent($image,imagecolorat($image,0,0));
but the result is quite awful if your original picture uses smooth transparency (which is probably the case with PNG pictures)
oflashp at bk dot ru
22-Apr-2005 03:25
22-Apr-2005 03:25
standart code rotate image(only Jpeg)
<?
$r=0; //rotate
$img="254.jpg" //image
$source = imagecreatefromjpeg($img);
$img = imagerotate($source, $r, 0);
imagejpeg($img);
?>
11-Apr-2005 06:58
Just an advice for those who want to create image galleries and want to add a function to rotate pictures.
The way this here works is always to decompress the picture, rotate it and compress it again.
Therefore there _WILL_ always be a loss in quality. The more often you rotate the image the stronger the artefacts will be visible.
Also using ImageMagick, if available does not help, as it also does not support lossless JPG manipulations.
If you need a rotate function, ask your provider to install JPEGTRAN on the machine your server runs on and use the command line tool from your php application.
wulff at fyens dot dk
01-Mar-2005 10:22
01-Mar-2005 10:22
I liked the rotateImageBicubic function implemented by darren at lucidtone dot com. But it just snipped off the parts of the image that were outside the original image.
I fixed this, even though I admit that my solution is a bit naive. But it might come in handy for somebody.
Also his bicubic implementation was broken on my machine so I left it out, if you need it just copy and paste it from above.
<?php
// $src_img - a GD image resource
// $angle - degrees to rotate clockwise, in degrees
// returns a GD image resource
// USAGE:
// $im = imagecreatefrompng('test.png');
// $im = imagerotate($im, 15);
// header('Content-type: image/png');
// imagepng($im);
function imageRotate($src_img, $angle, $bicubic=false) {
// convert degrees to radians
$angle = $angle + 180;
$angle = deg2rad($angle);
$src_x = imagesx($src_img);
$src_y = imagesy($src_img);
$center_x = floor($src_x/2);
$center_y = floor($src_y/2);
$cosangle = cos($angle);
$sinangle = sin($angle);
$corners=array(array(0,0), array($src_x,0), array($src_x,$src_y), array(0,$src_y));
foreach($corners as $key=>$value) {
$value[0]-=$center_x; //Translate coords to center for rotation
$value[1]-=$center_y;
$temp=array();
$temp[0]=$value[0]*$cosangle+$value[1]*$sinangle;
$temp[1]=