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site/jpgraph/jpgraph_imgtrans.php 8.03 KB
8ec98c9f   Guillaume   MAJ
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  <?php
  //=======================================================================
  // File:        JPGRAPH_IMGTRANS.PHP
  // Description: Extension for JpGraph to do some simple img transformations
  // Created:     2003-09-06
  // Ver:         $Id: jpgraph_imgtrans.php 1106 2009-02-22 20:16:35Z ljp $
  //
  // Copyright (c) Asial Corporation. All rights reserved.
  //========================================================================
  
  //------------------------------------------------------------------------
  // Class ImgTrans
  // Perform some simple image transformations.
  //------------------------------------------------------------------------
  class ImgTrans {
      private $gdImg=null;
  
      function __construct($aGdImg) {
          // Constructor
          $this->gdImg = $aGdImg;
      }
  
      // --------------------------------------------------------------------
      // _TransVert3D() and _TransHor3D() are helper methods to
      // Skew3D().
      // --------------------------------------------------------------------
      function _TransVert3D($aGdImg,$aHorizon=100,$aSkewDist=120,$aDir=SKEW3D_DOWN,$aMinSize=true,$aFillColor='#FFFFFF',$aQuality=false,$aBorder=false,$aHorizonPos=0.5) {
  
  
          // Parameter check
      if( $aHorizonPos < 0 || $aHorizonPos > 1.0 ) {
          JpGraphError::RaiseL(9001);
          //("Value for image transformation out of bounds.\nVanishing point on horizon must be specified as a value between 0 and 1.");
      }
  
      $w = imagesx($aGdImg);
      $h = imagesy($aGdImg);
  
      // Create new image
      $ww = $w;
      if( $aMinSize )
      $hh = ceil($h * $aHorizon / ($aSkewDist+$h));
      else
      $hh = $h;
  
      $newgdh = imagecreatetruecolor($ww,$hh);
      $crgb = new RGB( $newgdh );
      $fillColor = $crgb->Allocate($aFillColor);
      imagefilledrectangle($newgdh,0,0,$ww-1,$hh-1,$fillColor);
  
      if( $aBorder ) {
          $colidx = $crgb->Allocate($aBorder);
          imagerectangle($newgdh,0,0,$ww-1,$hh-1,$colidx);
      }
  
      $mid = round($w * $aHorizonPos);
  
      $last=$h;
      for($y=0; $y < $h; ++$y) {
  
          $yp = $h-$y-1;
          $yt = floor($yp * $aHorizon / ($aSkewDist + $yp));
  
          if( !$aQuality ) {
              if( $last <= $yt ) continue ;
              $last = $yt;
          }
  
          for($x=0; $x < $w; ++$x) {
              $xt = ($x-$mid) * $aSkewDist / ($aSkewDist + $yp);
              if( $aDir == SKEW3D_UP )
              $rgb = imagecolorat($aGdImg,$x,$h-$y-1);
              else
              $rgb = imagecolorat($aGdImg,$x,$y);
              $r = ($rgb >> 16) & 0xFF;
              $g = ($rgb >> 8) & 0xFF;
              $b = $rgb & 0xFF;
              $colidx = imagecolorallocate($newgdh,$r,$g,$b);
              $xt = round($xt+$mid);
              if( $aDir == SKEW3D_UP ) {
                  $syt = $yt;
              }
              else {
                  $syt = $hh-$yt-1;
              }
  
              if( !empty($set[$yt]) ) {
                  $nrgb = imagecolorat($newgdh,$xt,$syt);
                  $nr = ($nrgb >> 16) & 0xFF;
                  $ng = ($nrgb >> 8) & 0xFF;
                  $nb = $nrgb & 0xFF;
                  $colidx = imagecolorallocate($newgdh,floor(($r+$nr)/2),
                  floor(($g+$ng)/2),floor(($b+$nb)/2));
              }
  
              imagesetpixel($newgdh,$xt,$syt,$colidx);
          }
  
          $set[$yt] = true;
      }
  
      return $newgdh;
      }
  
      // --------------------------------------------------------------------
      // _TransVert3D() and _TransHor3D() are helper methods to
      // Skew3D().
      // --------------------------------------------------------------------
      function _TransHor3D($aGdImg,$aHorizon=100,$aSkewDist=120,$aDir=SKEW3D_LEFT,$aMinSize=true,$aFillColor='#FFFFFF',$aQuality=false,$aBorder=false,$aHorizonPos=0.5) {
  
          $w = imagesx($aGdImg);
          $h = imagesy($aGdImg);
  
          // Create new image
          $hh = $h;
          if( $aMinSize )
          $ww = ceil($w * $aHorizon / ($aSkewDist+$w));
          else
          $ww = $w;
  
          $newgdh = imagecreatetruecolor($ww,$hh);
          $crgb = new RGB( $newgdh );
          $fillColor = $crgb->Allocate($aFillColor);
          imagefilledrectangle($newgdh,0,0,$ww-1,$hh-1,$fillColor);
  
          if( $aBorder ) {
              $colidx = $crgb->Allocate($aBorder);
              imagerectangle($newgdh,0,0,$ww-1,$hh-1,$colidx);
          }
  
          $mid = round($h * $aHorizonPos);
  
          $last = -1;
          for($x=0; $x < $w-1; ++$x) {
              $xt = floor($x * $aHorizon / ($aSkewDist + $x));
              if( !$aQuality ) {
                  if( $last >= $xt ) continue ;
                  $last = $xt;
              }
  
              for($y=0; $y < $h; ++$y) {
                  $yp = $h-$y-1;
                  $yt = ($yp-$mid) * $aSkewDist / ($aSkewDist + $x);
  
                  if( $aDir == SKEW3D_RIGHT )
                  $rgb = imagecolorat($aGdImg,$w-$x-1,$y);
                  else
                  $rgb = imagecolorat($aGdImg,$x,$y);
                  $r = ($rgb >> 16) & 0xFF;
                  $g = ($rgb >> 8) & 0xFF;
                  $b = $rgb & 0xFF;
                  $colidx = imagecolorallocate($newgdh,$r,$g,$b);
                  $yt = floor($hh-$yt-$mid-1);
                  if( $aDir == SKEW3D_RIGHT ) {
                      $sxt = $ww-$xt-1;
                  }
                  else
                  $sxt = $xt ;
  
                  if( !empty($set[$xt]) ) {
                      $nrgb = imagecolorat($newgdh,$sxt,$yt);
                      $nr = ($nrgb >> 16) & 0xFF;
                      $ng = ($nrgb >> 8) & 0xFF;
                      $nb = $nrgb & 0xFF;
                      $colidx = imagecolorallocate($newgdh,floor(($r+$nr)/2),
                      floor(($g+$ng)/2),floor(($b+$nb)/2));
                  }
                  imagesetpixel($newgdh,$sxt,$yt,$colidx);
              }
  
              $set[$xt] = true;
          }
  
          return $newgdh;
      }
  
      // --------------------------------------------------------------------
      // Skew image for the apperance of a 3D effect
      // This transforms an image into a 3D-skewed version
      // of the image. The transformation is specified by giving the height
      // of the artificial horizon and specifying a "skew" factor which
      // is the distance on the horizon line between the point of
      // convergence and perspective line.
      //
      // The function returns the GD handle of the transformed image
      // leaving the original image untouched.
      //
      // Parameters:
      // * $aGdImg, GD handle to the image to be transformed
      // * $aHorizon, Distance to the horizon
      // * $aSkewDist, Distance from the horizon point of convergence
      //   on the horizon line to the perspective points. A larger
      //   value will fore-shorten the image more
      // * $aDir, parameter specifies type of convergence. This of this
      //   as the walls in a room you are looking at. This specifies if the
      //   image should be applied on the left,right,top or bottom walls.
      // * $aMinSize, true=make the new image just as big as needed,
      //   false = keep the image the same size as the original image
      // * $aFillColor, Background fill color in the image
      // * $aHiQuality, true=performa some interpolation that improves
      //   the image quality but at the expense of performace. Enabling
      //   high quality will have a dramatic effect on the time it takes
      //   to transform an image.
      // * $aBorder, if set to anything besides false this will draw a
      //   a border of the speciied color around the image
      // --------------------------------------------------------------------
      function Skew3D($aHorizon=120,$aSkewDist=150,$aDir=SKEW3D_DOWN,$aHiQuality=false,$aMinSize=true,$aFillColor='#FFFFFF',$aBorder=false) {
          return $this->_Skew3D($this->gdImg,$aHorizon,$aSkewDist,$aDir,$aHiQuality,
          $aMinSize,$aFillColor,$aBorder);
      }
  
      function _Skew3D($aGdImg,$aHorizon=120,$aSkewDist=150,$aDir=SKEW3D_DOWN,$aHiQuality=false,$aMinSize=true,$aFillColor='#FFFFFF',$aBorder=false) {
          if( $aDir == SKEW3D_DOWN || $aDir == SKEW3D_UP )
          return $this->_TransVert3D($aGdImg,$aHorizon,$aSkewDist,$aDir,$aMinSize,$aFillColor,$aHiQuality,$aBorder);
          else
          return $this->_TransHor3D($aGdImg,$aHorizon,$aSkewDist,$aDir,$aMinSize,$aFillColor,$aHiQuality,$aBorder);
  
      }
  
  }
  
  
  ?>