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