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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 782 2006-10-08 08:09:02Z ljp $

//

// 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);

    }

}

?>