jpgraph_imgtrans.php
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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);
}
}
?>