Example #1
0
 function imagerotate(&$srcImg, $angle, $bgcolor, $ignore_transparent = 0)
 {
     function rotateX($x, $y, $theta)
     {
         return $x * cos($theta) - $y * sin($theta);
     }
     function rotateY($x, $y, $theta)
     {
         return $x * sin($theta) + $y * cos($theta);
     }
     $srcw = imagesx($srcImg);
     $srch = imagesy($srcImg);
     if ($angle == 0) {
         return $srcImg;
     }
     // Convert the angle to radians
     $theta = deg2rad($angle);
     // Calculate the width of the destination image.
     $temp = array(rotateX(0, 0, 0 - $theta), rotateX($srcw, 0, 0 - $theta), rotateX(0, $srch, 0 - $theta), rotateX($srcw, $srch, 0 - $theta));
     $minX = floor(min($temp));
     $maxX = ceil(max($temp));
     $width = $maxX - $minX;
     // Calculate the height of the destination image.
     $temp = array(rotateY(0, 0, 0 - $theta), rotateY($srcw, 0, 0 - $theta), rotateY(0, $srch, 0 - $theta), rotateY($srcw, $srch, 0 - $theta));
     $minY = floor(min($temp));
     $maxY = ceil(max($temp));
     $height = $maxY - $minY;
     $destimg = imagecreatetruecolor($width, $height);
     imagefill($destimg, 0, 0, imagecolorallocate($destimg, 0, 255, 0));
     // sets all pixels in the new image
     for ($x = $minX; $x < $maxX; $x++) {
         for ($y = $minY; $y < $maxY; $y++) {
             // fetch corresponding pixel from the source image
             $srcX = round(rotateX($x, $y, $theta));
             $srcY = round(rotateY($x, $y, $theta));
             if ($srcX >= 0 && $srcX < $srcw && $srcY >= 0 && $srcY < $srch) {
                 $color = imagecolorat($srcImg, $srcX, $srcY);
             } else {
                 $color = $bgcolor;
             }
             imagesetpixel($destimg, $x - $minX, $y - $minY, $color);
         }
     }
     return $destimg;
 }
Example #2
0
 /**
  * imagerotate() does not appear in PHP with non-bundled GD libraries.
  * Because this is written in PHP, it is much slower than the bundled version.
  * 
  * @param resource	$srcImg an image resource
  * @param float		$angle rotation angle, in degrees
  * @param int		$bgColor specifies the color of the uncovered zone after the rotation
  * @param int 		$ignoreTransparent if set and non-zero, transparent colors are ignored. Default: 0.
  * @return resource	image resource for the rotated image
  * @access private
  */
 private function imagerotate($srcImg, $angle, $bgColor, $ignoreTransparent = 0)
 {
     function rotateX($x, $y, $theta)
     {
         return $x * cos($theta) - $y * sin($theta);
     }
     function rotateY($x, $y, $theta)
     {
         return $x * sin($theta) + $y * cos($theta);
     }
     $srcW = imagesx($srcImg);
     $srcH = imagesy($srcImg);
     // Normalize angle
     $angle %= 360;
     if ($angle == 0) {
         if ($ignoreTransparent == 0) {
             imagesavealpha($srcImg, true);
         }
         return $srcImg;
     }
     // Convert the angle to radians
     $theta = deg2rad($angle);
     $minX = $maxX = $minY = $maxY = 0;
     // Standard case of rotate
     if (abs($angle) == 90 || abs($angle) == 270) {
         $width = $srcH;
         $height = $srcW;
         if ($angle == 90 || $angle == -270) {
             $minX = 0;
             $maxX = $width;
             $minY = -$height + 1;
             $maxY = 1;
         } else {
             if ($angle == -90 || $angle == 270) {
                 $minX = -$width + 1;
                 $maxX = 1;
                 $minY = 0;
                 $maxY = $height;
             }
         }
     } else {
         if (abs($angle) === 180) {
             $width = $srcW;
             $height = $srcH;
             $minX = -$width + 1;
             $maxX = 1;
             $minY = -$height + 1;
             $maxY = 1;
         } else {
             // Calculate the width of the destination image
             $temp = array(rotateX(0, 0, 0 - $theta), rotateX($srcW, 0, 0 - $theta), rotateX(0, $srcH, 0 - $theta), rotateX($srcW, $srcH, 0 - $theta));
             $minX = floor(min($temp));
             $maxX = ceil(max($temp));
             $width = $maxX - $minX;
             // Calculate the height of the destination image
             $temp = array(rotateY(0, 0, 0 - $theta), rotateY($srcW, 0, 0 - $theta), rotateY(0, $srcH, 0 - $theta), rotateY($srcW, $srcH, 0 - $theta));
             $minY = floor(min($temp));
             $maxY = ceil(max($temp));
             $height = $maxY - $minY;
         }
     }
     $destImg = imagecreatetruecolor($width, $height);
     if ($ignoreTransparent == 0) {
         imagefill($destImg, 0, 0, imagecolorallocatealpha($destImg, 255, 255, 255, 127));
         imagesavealpha($destImg, true);
     }
     // Sets all pixels in the new image
     for ($x = $minX; $x < $maxX; $x++) {
         for ($y = $minY; $y < $maxY; $y++) {
             // Fetch corresponding pixel from the source image
             $srcX = round(rotateX($x, $y, $theta));
             $srcY = round(rotateY($x, $y, $theta));
             if ($srcX >= 0 && $srcX < $srcW && $srcY >= 0 && $srcY < $srcH) {
                 $color = imagecolorat($srcImg, $srcX, $srcY);
             } else {
                 $color = $bgColor;
             }
             imagesetpixel($destImg, $x - $minX, $y - $minY, $color);
         }
     }
     return $destImg;
 }