<?php //======================================================================= // File: JPGRAPH_IMGTRANS.PHP // Description: Extension for JpGraph to do some simple img transformations // Created: 2003-09-06 // Author: Johan Persson (johanp@aditus.nu) // Ver: $Id: jpgraph_imgtrans.php,v 1.1 2006/07/07 13:37:14 powles Exp $ // // Copyright (c) Aditus Consulting. All rights reserved. //======================================================================== //------------------------------------------------------------------------ // Class ImgTrans // Perform some simple image transformations. //------------------------------------------------------------------------ class ImgTrans { var $gdImg=null; function ImgTrans($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); } } ?>