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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);
-
- }
-
-}
-
-
-?>
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