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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) Aditus Consulting. 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)); |
} |
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imagesetpixel($newgdh,$xt,$syt,$colidx); |
} |
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$set[$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,$aBorder); |
} |
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function _Skew3D($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); |
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} |
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} |
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?> |