Search:

# CWIS Developers Documentation

- Main Page
- Classes
- Files

- File List
- File Members

# SPTImage.php

Go to the documentation of this file.

    00001 <?PHP
    00002
    00003 #
    00004 #   FILE:  SPT--SPTImage.php
    00005 #
    00006 #   METHODS PROVIDED:
    00007 #       SPTImage($ImageIdOrFileNameOrImageObj,
    00008 #                   $MaxPreviewWidth = NULL, $MaxPreviewHeight = NULL,
    00009 #                   $MaxThumbnailWidth = NULL, $MaxThumbnailHeight = NULL)
    00010 #           - object constructor
    00011 #       Delete()
    00012 #           - delete image and associated files and data
    00013 #       AltText($NewValue = NULL)
    00014 #           - get/set alt text attribute
    00015 #       Id()
    00016 #       Url()
    00017 #       PreviewUrl()
    00018 #       ThumbnailUrl()
    00019 #       Format()
    00020 #       Height()
    00021 #       Width()
    00022 #       PreviewHeight()
    00023 #       PreviewWidth()
    00024 #       ThumbnailHeight()
    00025 #       ThumbnailWidth()
    00026 #           - get attributes
    00027 #
    00028 #   AUTHOR:  Edward Almasy
    00029 #
    00030 #   Part of the Scout Portal Toolkit
    00031 #   Copyright 2002-2003 Internet Scout Project
    00032 #   http://scout.wisc.edu
    00033 #
    00034
    00035
    00036 class SPTImage {
    00037
    00038     # ---- PUBLIC INTERFACE --------------------------------------------------
    00039
    00040     # object constructor
    00041     function SPTImage($ImageIdOrFileNameOrImageObj,
    00042                       $MaxPreviewWidth = NULL, $MaxPreviewHeight = NULL,
    00043                       $MaxThumbnailWidth = NULL, $MaxThumbnailHeight = NULL)
    00044     {
    00045         # clear error status (0 = AI_OKAY)
    00046         $this->ErrorStatus = 0;
    00047
    00048         # trigger the Image class file to be autoloaded since some parts of this
    00049         # class (SPTImage) use constants defined in it but don't construct Image
    00050         # objects
    00051         new Image(NULL);
    00052
    00053         # set base path for image storage
    00054         # (NOTE:  This is also used for URLs, so it must be a relative path.)
    00055         # (NOTE:  These must match paths in SPTImage::CheckDirectories()!!!)
    00056         $this->ImagePath = "ImageStorage/";
    00057         $this->PreviewPath = $this->ImagePath."Previews/";
    00058         $this->ThumbnailPath = $this->ImagePath."Thumbnails/";
    00059
    00060         # create and save a database handle for our use
    00061         $this->DB = new SPTDatabase();
    00062
    00063         # if image object was passed in
    00064         if (is_object($ImageIdOrFileNameOrImageObj)
    00065                 && method_exists($ImageIdOrFileNameOrImageObj, "SPTImage"))
    00066         {
    00067             # create copy of image passed in
    00068             $this->CreateCopyOfImage($ImageIdOrFileNameOrImageObj);
    00069         }
    00070         # else if image ID was passed in
    00071         elseif (($ImageIdOrFileNameOrImageObj > 0)
    00072                 && preg_match("/[0-9]+/", $ImageIdOrFileNameOrImageObj))
    00073         {
    00074             # load info on existing image
    00075             $this->LoadImageInfo($ImageIdOrFileNameOrImageObj);
    00076         }
    00077         # else assume that value passed in is file name
    00078         else
    00079         {
    00080             # create new image from named file
    00081             $this->CreateNewImage($ImageIdOrFileNameOrImageObj,
    00082                                   $MaxPreviewWidth, $MaxPreviewHeight,
    00083                                   $MaxThumbnailWidth, $MaxThumbnailHeight);
    00084         }
    00085     }
    00086
    00087     # get attributes
    00088     function Id() {  return $this->Id;  }
    00089     function Url() {  return $this->FileName;  }
    00090     function PreviewUrl() {  return $this->PreviewFileName;  }
    00091     function ThumbnailUrl() {  return $this->ThumbnailFileName;  }
    00092     function Format() {  return $this->Format;  }
    00093     function Height() {  return $this->Height;  }
    00094     function Width() {  return $this->Width;  }
    00095     function PreviewHeight() {  return $this->PreviewHeight;  }
    00096     function PreviewWidth() {  return $this->PreviewWidth;  }
    00097     function ThumbnailHeight() {  return $this->ThumbnailHeight;  }
    00098     function ThumbnailWidth() {  return $this->ThumbnailWidth;  }
    00099     function ImageStorageDirectory() {  return $this->ImagePath;  }
    00100     function PreviewStorageDirectory() {  return $this->PreviewPath;  }
    00101     function ThumbnailStorageDirectory() {  return $this->ThumbnailPath;  }
    00102     function GetLink() {  return $this->FileName;  }
    00103
    00104     # get/set attributes
    00105     function AltText($NewValue = NULL)
    00106     {
    00107         # if new value supplied and new value differs from existing value
    00108         if (($NewValue !== NULL) && ($NewValue != $this->AltText))
    00109         {
    00110             # save new value to database
    00111             $this->DB->Query("UPDATE Images SET"
    00112                              ." AltText = '".addslashes($NewValue)."'"
    00113                              ." WHERE ImageId = ".$this->Id);
    00114
    00115             # save new value locally
    00116             $this->AltText = $NewValue;
    00117         }
    00118
    00119         # return attribute value to caller
    00120         return $this->AltText;
    00121     }
    00122
    00123     # delete image and associated files and data
    00124     function Delete()
    00125     {
    00126         # delete base image file
    00127         if (file_exists($this->FileName)) {  unlink($this->FileName);  }
    00128
    00129         # delete preview image file
    00130         if (file_exists($this->PreviewFileName)) {  unlink($this->PreviewFileName);  }
    00131
    00132         # delete thumbnail image file
    00133         if (file_exists($this->ThumbnailFileName)) {  unlink($this->ThumbnailFileName);  }
    00134
    00135         # delete image info record in database
    00136         $this->DB->Query("DELETE FROM Images WHERE ImageId = ".$this->Id);
    00137     }
    00138
    00139     # return error status set by the constructor
    00140     function Status()
    00141     {
    00142         return $this->ErrorStatus;
    00143     }
    00144
    00145     # check to make sure image storage directories are available
    00146     # (returns array of error codes or NULL if no errors found)
    00147     # (may be called statically)
    00148     function CheckDirectories()
    00149     {
    00150         # determine paths
    00151         # (NOTE:  These must match paths in the constructur!!!)
    00152         $ImagePath = "ImageStorage/";
    00153         $PreviewPath = $ImagePath."Previews/";
    00154         $ThumbnailPath = $ImagePath."Thumbnails/";
    00155
    00156         # assume everything will be okay
    00157         $ErrorsFound = NULL;
    00158
    00159         # check base image directory
    00160         if (!is_dir($ImagePath) || !is_writable($ImagePath))
    00161         {
    00162             if (!is_dir($ImagePath))
    00163             {
    00164                 @mkdir($ImagePath, 0755);
    00165             }
    00166             else
    00167             {
    00168                 @chmod($ImagePath, 0755);
    00169             }
    00170             if (!is_dir($ImagePath))
    00171             {
    00172                 $ErrorsFound[] = "Image Storage Directory Not Found";
    00173             }
    00174             elseif (!is_writable($ImagePath))
    00175             {
    00176                 $ErrorsFound[] = "Image Storage Directory Not Writable";
    00177             }
    00178         }
    00179
    00180         # check preview directory
    00181         if (!is_dir($PreviewPath) || !is_writable($PreviewPath))
    00182         {
    00183             if (!is_dir($PreviewPath))
    00184             {
    00185                 @mkdir($PreviewPath, 0755);
    00186             }
    00187             else
    00188             {
    00189                 @chmod($PreviewPath, 0755);
    00190             }
    00191             if (!is_dir($PreviewPath))
    00192             {
    00193                 $ErrorsFound[] = "Preview Storage Directory Not Found";
    00194             }
    00195             elseif (!is_writable($PreviewPath))
    00196             {
    00197                 $ErrorsFound[] = "Preview Storage Directory Not Writable";
    00198             }
    00199         }
    00200
    00201         # check thumbnail directory
    00202         if (!is_dir($ThumbnailPath) || !is_writable($ThumbnailPath))
    00203         {
    00204             if (!is_dir($ThumbnailPath))
    00205             {
    00206                 @mkdir($ThumbnailPath, 0755);
    00207             }
    00208             else
    00209             {
    00210                 @chmod($ThumbnailPath, 0755);
    00211             }
    00212             if (!is_dir($ThumbnailPath))
    00213             {
    00214                 $ErrorsFound[] = "Thumbnail Storage Directory Not Found";
    00215             }
    00216             elseif (!is_writable($ThumbnailPath))
    00217             {
    00218                 $ErrorsFound[] = "Thumbnail Storage Directory Not Writable";
    00219             }
    00220         }
    00221
    00222         # return any errors found to caller
    00223         return $ErrorsFound;
    00224     }
    00225
    00226
    00227     # ---- PRIVATE INTERFACE -------------------------------------------------
    00228
    00229     var $Id;
    00230     var $FileName;
    00231     var $ImagePath;
    00232     var $PreviewPath;
    00233     var $ThumbnailPath;
    00234     var $PreviewFileName;
    00235     var $ThumbnailFileName;
    00236     var $Format;
    00237     var $AltText;
    00238     var $Url;
    00239     var $PreviewUrl;
    00240     var $ThumbnailUrl;
    00241     var $Height;
    00242     var $Width;
    00243     var $PreviewHeight;
    00244     var $PreviewWidth;
    00245     var $ThumbnailHeight;
    00246     var $ThumbnailWidth;
    00247     var $DB;
    00248     var $ErrorStatus;
    00249
    00250     function CreateNewImage($FileName, $MaxPreviewWidth, $MaxPreviewHeight,
    00251                             $MaxThumbnailWidth, $MaxThumbnailHeight)
    00252     {
    00253         # if file does not exist or is not readable
    00254         if (!is_readable($FileName))
    00255         {
    00256             # set error status
    00257             $this->ErrorStatus = AI_FILEUNREADABLE;
    00258         }
    00259         else
    00260         {
    00261             # if image is invalid or unsupported type
    00262             $SrcImage = new Image($FileName);
    00263             if ($SrcImage->Status() != AI_OKAY)
    00264             {
    00265                 # set error status
    00266                 $this->ErrorStatus = $SrcImage->Status();
    00267             }
    00268             else
    00269             {
    00270                 # retrieve image type
    00271                 $this->Format = $SrcImage->Type();
    00272
    00273                 # generate new image ID
    00274                 $this->Id = $this->GenerateNewImageId();
    00275
    00276                 # generate and set file names
    00277                 $this->SetFileNames();
    00278
    00279                 # if our image file name differs from file name passed in
    00280                 if (realpath($this->FileName) != realpath($FileName))
    00281                 {
    00282                     # create image file
    00283                     $SrcImage->SaveAs($this->FileName);
    00284
    00285                     # if create failed set error status and bail out
    00286                     if ($SrcImage->Status() != AI_OKAY)
    00287                     {
    00288                         echo "create failed<br>";
    00289                         echo "Status: ".$SrcImage->Status()."<br>";
    00290                         echo "Failed Command: ".$SrcImage->FailedExternalCommand()."<br>";
    00291                         echo "Missing External Executables: ";
    00292                         print_r(Image::MissingExternalExecutables());
    00293                         echo "<br>";
    00294                         $this->ErrorStatus = $SrcImage->Status();
    00295                         return;
    00296                     }
    00297                 }
    00298
    00299                 # retrieve image width and height
    00300                 $this->Height = $SrcImage->YSize();
    00301                 $this->Width = $SrcImage->XSize();
    00302
    00303                 # generate preview image and calculate width and height
    00304                 $MaxPreviewWidth = min($MaxPreviewWidth, $this->Width);
    00305                 $MaxPreviewHeight = min($MaxPreviewHeight, $this->Height);
    00306                 $SrcImage->ScaleTo($MaxPreviewWidth, $MaxPreviewHeight, TRUE);
    00307                 $SrcImage->SaveAs($this->PreviewFileName, IMGTYPE_JPEG);
    00308                 if ($SrcImage->Status() != AI_OKAY)
    00309                 {
    00310                     echo "preview save as failed<br>";
    00311                     $this->ErrorStatus = $SrcImage->Status();
    00312                     return;
    00313                 }
    00314                 if (($this->Width * $MaxPreviewHeight)
    00315                         > ($this->Height * $MaxPreviewWidth))
    00316                 {
    00317                     $this->PreviewWidth = $MaxPreviewWidth;
    00318                     $this->PreviewHeight =
    00319                             ($MaxPreviewWidth * $SrcImage->YSize()) / $SrcImage->XSize();
    00320                 }
    00321                 else
    00322                 {
    00323                     $this->PreviewWidth =
    00324                             ($MaxPreviewHeight * $SrcImage->XSize()) / $SrcImage->YSize();
    00325                     $this->PreviewHeight = $MaxPreviewHeight;
    00326                 }
    00327
    00328                 # generate thumbnail image and calculate width and height
    00329                 $MaxThumbnailWidth = min($MaxThumbnailWidth, $this->Width);
    00330                 $MaxThumbnailHeight = min($MaxThumbnailHeight, $this->Height);
    00331                 $SrcImage->ScaleTo($MaxThumbnailWidth, $MaxThumbnailHeight, TRUE);
    00332                 $SrcImage->SaveAs($this->ThumbnailFileName, IMGTYPE_JPEG);
    00333                 if ($SrcImage->Status() != AI_OKAY)
    00334                 {
    00335                     echo "thumbnail SaveAs failed.<br>";
    00336                     $this->ErrorStatus = $SrcImage->Status();
    00337                     return;
    00338                 }
    00339                 if (($this->Width * $MaxThumbnailHeight)
    00340                         > ($this->Height * $MaxThumbnailWidth))
    00341                 {
    00342                     $this->ThumbnailWidth = $MaxThumbnailWidth;
    00343                     $this->ThumbnailHeight =
    00344                             ($MaxThumbnailWidth * $SrcImage->YSize()) / $SrcImage->XSize();
    00345                 }
    00346                 else
    00347                 {
    00348                     $this->ThumbnailWidth = ($MaxThumbnailHeight * $SrcImage->XSize()) / $SrcImage->YSize();
    00349                     $this->ThumbnailHeight = $MaxThumbnailHeight;
    00350                 }
    00351
    00352                 # save image attributes to database
    00353                 $this->SaveImageInfo();
    00354             }
    00355         }
    00356     }
    00357
    00358     function LoadImageInfo($ImageId)
    00359     {
    00360         # save image ID
    00361         $this->Id = $ImageId;
    00362
    00363         # load image record from database
    00364         $this->DB->Query("SELECT * FROM Images WHERE ImageId = ".$ImageId);
    00365
    00366         # if the ID is invalid
    00367         if (!$this->DB->NumRowsSelected())
    00368         {
    00369             $this->ErrorStatus = AI_INTERNALERROR;
    00370             return;
    00371         }
    00372
    00373         $Record = $this->DB->FetchRow();
    00374
    00375         # load in values from record
    00376         $this->Format          = $Record["Format"];
    00377         $this->AltText         = $Record["AltText"];
    00378         $this->Height          = $Record["Height"];
    00379         $this->Width           = $Record["Width"];
    00380         $this->PreviewHeight   = $Record["PreviewHeight"];
    00381         $this->PreviewWidth    = $Record["PreviewWidth"];
    00382         $this->ThumbnailHeight = $Record["ThumbnailHeight"];
    00383         $this->ThumbnailWidth  = $Record["ThumbnailWidth"];
    00384
    00385         # generate file names
    00386         $this->SetFileNames();
    00387     }
    00388
    00389     function CreateCopyOfImage($SrcImage)
    00390     {
    00391         $Image = new Image($SrcImage->Url());
    00392         if ($Image->Status() != AI_OKAY)
    00393         {
    00394             # set error status
    00395             $this->ErrorStatus = $Image->Status();
    00396             return;
    00397         }
    00398
    00399         # generate new image ID
    00400         $this->Id = $this->GenerateNewImageId();
    00401
    00402         # generate file names
    00403         $this->SetFileNames();
    00404
    00405         # copy attributes from source image
    00406         $this->Format = $SrcImage->Format();
    00407         $this->AltText = $SrcImage->AltText();
    00408         $this->Width = $SrcImage->Width();
    00409         $this->Height = $SrcImage->Height();
    00410         $this->PreviewWidth = $SrcImage->PreviewWidth();
    00411         $this->PreviewHeight = $SrcImage->PreviewHeight();
    00412         $this->ThumbnailWidth = $SrcImage->ThumbnailWidth();
    00413         $this->ThumbnailHeight = $SrcImage->ThumbnailHeight();
    00414
    00415         # copy source image files
    00416         copy($SrcImage->Url(), $this->FileName);
    00417         copy($SrcImage->PreviewUrl(), $this->PreviewFileName);
    00418         copy($SrcImage->ThumbnailUrl(), $this->ThumbnailFileName);
    00419
    00420         # save image attributes to database
    00421         $this->SaveImageInfo();
    00422     }
    00423
    00424     # generate and save image, preview, and thumnail file names
    00425     # (requires image ID and format to be set beforehand)
    00426     function SetFileNames()
    00427     {
    00428         if (Image::Extension($this->Format))
    00429         {
    00430             $FileExtension = Image::Extension($this->Format);
    00431         }
    00432         else
    00433         {
    00434             $FileExtension = "";
    00435         }
    00436
    00437         $this->FileName = $this->ImagePath."Img--"
    00438                 .sprintf("%08d.", $this->Id).$FileExtension;
    00439         $this->PreviewFileName = $this->PreviewPath."Preview--"
    00440                 .sprintf("%08d.", $this->Id).$FileExtension;
    00441         $this->ThumbnailFileName = $this->ThumbnailPath."Thumb--"
    00442                 .sprintf("%08d.", $this->Id).$FileExtension;
    00443     }
    00444
    00445     # retrieve next image ID
    00446     function GenerateNewImageId()
    00447     {
    00448         # look up highest image ID in database
    00449         $CurrentHighestId = $this->DB->Query("SELECT ImageId FROM Images"
    00450                                              ." ORDER BY ImageId DESC LIMIT 1",
    00451                                              "ImageId");
    00452
    00453         # return next highest ID or 1 if no ID yet used
    00454         return ($CurrentHighestId > 0) ? ($CurrentHighestId + 1) : 1;
    00455     }
    00456
    00457     # store image attributes to database
    00458     function SaveImageInfo()
    00459     {
    00460         # look for existing image record with matching ID
    00461         $RecordCount = $this->DB->Query("SELECT COUNT(*) AS RecordCount FROM Images"
    00462                                         ." WHERE ImageId = ".$this->Id,
    00463                                         "RecordCount");
    00464
    00465         # if matching ID found
    00466         if ($RecordCount > 0)
    00467         {
    00468             # update existing image record
    00469             $this->DB->Query("UPDATE Images SET"
    00470                              ." Format = '"         .$this->Format."',"
    00471                              ." AltText = '"        .addslashes($this->AltText)."',"
    00472                              ." Height = '"         .$this->Height."',"
    00473                              ." Width = '"          .$this->Width."',"
    00474                              ." PreviewHeight = '"  .$this->PreviewHeight."',"
    00475                              ." PreviewWidth = '"   .$this->PreviewWidth."',"
    00476                              ." ThumbnailHeight = '".$this->ThumbnailHeight."',"
    00477                              ." ThumbnailWidth = '" .$this->ThumbnailWidth."'"
    00478                              ." WHERE ImageId = ".$this->Id);
    00479         }
    00480         else
    00481         {
    00482             # add new image record
    00483             $this->DB->Query("INSERT INTO Images SET"
    00484                              ." ImageId = '"        .$this->Id."',"
    00485                              ." Format = '"         .$this->Format."',"
    00486                              ." AltText = '"        .addslashes($this->AltText)."',"
    00487                              ." Height = '"         .$this->Height."',"
    00488                              ." Width = '"          .$this->Width."',"
    00489                              ." PreviewHeight = '"  .$this->PreviewHeight."',"
    00490                              ." PreviewWidth = '"   .$this->PreviewWidth."',"
    00491                              ." ThumbnailHeight = '".$this->ThumbnailHeight."',"
    00492                              ." ThumbnailWidth = '" .$this->ThumbnailWidth."'");
    00493         }
    00494     }
    00495 }
    00496
    00497
    00498 ?>

Copyright 2010 Internet Scout