| 1 | <?php
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| 2 | //=======================================================================
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| 3 | // File: JPGRAPH_IMGTRANS.PHP
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| 4 | // Description: Extension for JpGraph to do some simple img transformations
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| 5 | // Created: 2003-09-06
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| 6 | // Ver: $Id: jpgraph_imgtrans.php 1106 2009-02-22 20:16:35Z ljp $
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| 7 | //
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| 8 | // Copyright (c) Asial Corporation. All rights reserved.
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| 9 | //========================================================================
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| 10 |
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| 11 | //------------------------------------------------------------------------
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| 12 | // Class ImgTrans
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| 13 | // Perform some simple image transformations.
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| 14 | //------------------------------------------------------------------------
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| 15 | class ImgTrans {
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| 16 | private $gdImg=null;
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| 17 |
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| 18 | function __construct($aGdImg) {
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| 19 | // Constructor
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| 20 | $this->gdImg = $aGdImg;
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| 21 | }
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| 22 |
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| 23 | // --------------------------------------------------------------------
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| 24 | // _TransVert3D() and _TransHor3D() are helper methods to
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| 25 | // Skew3D().
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| 26 | // --------------------------------------------------------------------
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| 27 | function _TransVert3D($aGdImg,$aHorizon=100,$aSkewDist=120,$aDir=SKEW3D_DOWN,$aMinSize=true,$aFillColor='#FFFFFF',$aQuality=false,$aBorder=false,$aHorizonPos=0.5) {
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| 28 |
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| 29 |
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| 30 | // Parameter check
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| 31 | if( $aHorizonPos < 0 || $aHorizonPos > 1.0 ) {
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| 32 | JpGraphError::RaiseL(9001);
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| 33 | //("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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| 34 | }
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| 35 |
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| 36 | $w = imagesx($aGdImg);
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| 37 | $h = imagesy($aGdImg);
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| 38 |
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| 39 | // Create new image
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| 40 | $ww = $w;
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| 41 | if( $aMinSize )
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| 42 | $hh = ceil($h * $aHorizon / ($aSkewDist+$h));
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| 43 | else
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| 44 | $hh = $h;
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| 45 |
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| 46 | $newgdh = imagecreatetruecolor($ww,$hh);
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| 47 | $crgb = new RGB( $newgdh );
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| 48 | $fillColor = $crgb->Allocate($aFillColor);
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| 49 | imagefilledrectangle($newgdh,0,0,$ww-1,$hh-1,$fillColor);
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| 50 |
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| 51 | if( $aBorder ) {
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| 52 | $colidx = $crgb->Allocate($aBorder);
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| 53 | imagerectangle($newgdh,0,0,$ww-1,$hh-1,$colidx);
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| 54 | }
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| 55 |
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| 56 | $mid = round($w * $aHorizonPos);
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| 57 |
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| 58 | $last=$h;
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| 59 | for($y=0; $y < $h; ++$y) {
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| 60 |
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| 61 | $yp = $h-$y-1;
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| 62 | $yt = floor($yp * $aHorizon / ($aSkewDist + $yp));
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| 63 |
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| 64 | if( !$aQuality ) {
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| 65 | if( $last <= $yt ) continue ;
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| 66 | $last = $yt;
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| 67 | }
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| 68 |
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| 69 | for($x=0; $x < $w; ++$x) {
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| 70 | $xt = ($x-$mid) * $aSkewDist / ($aSkewDist + $yp);
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| 71 | if( $aDir == SKEW3D_UP )
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| 72 | $rgb = imagecolorat($aGdImg,$x,$h-$y-1);
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| 73 | else
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| 74 | $rgb = imagecolorat($aGdImg,$x,$y);
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| 75 | $r = ($rgb >> 16) & 0xFF;
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| 76 | $g = ($rgb >> 8) & 0xFF;
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| 77 | $b = $rgb & 0xFF;
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| 78 | $colidx = imagecolorallocate($newgdh,$r,$g,$b);
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| 79 | $xt = round($xt+$mid);
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| 80 | if( $aDir == SKEW3D_UP ) {
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| 81 | $syt = $yt;
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| 82 | }
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| 83 | else {
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| 84 | $syt = $hh-$yt-1;
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| 85 | }
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| 86 |
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| 87 | if( !empty($set[$yt]) ) {
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| 88 | $nrgb = imagecolorat($newgdh,$xt,$syt);
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| 89 | $nr = ($nrgb >> 16) & 0xFF;
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| 90 | $ng = ($nrgb >> 8) & 0xFF;
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| 91 | $nb = $nrgb & 0xFF;
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| 92 | $colidx = imagecolorallocate($newgdh,floor(($r+$nr)/2),
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| 93 | floor(($g+$ng)/2),floor(($b+$nb)/2));
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| 94 | }
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| 95 |
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| 96 | imagesetpixel($newgdh,$xt,$syt,$colidx);
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| 97 | }
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| 98 |
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| 99 | $set[$yt] = true;
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| 100 | }
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| 101 |
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| 102 | return $newgdh;
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| 103 | }
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| 104 |
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| 105 | // --------------------------------------------------------------------
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| 106 | // _TransVert3D() and _TransHor3D() are helper methods to
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| 107 | // Skew3D().
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| 108 | // --------------------------------------------------------------------
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| 109 | function _TransHor3D($aGdImg,$aHorizon=100,$aSkewDist=120,$aDir=SKEW3D_LEFT,$aMinSize=true,$aFillColor='#FFFFFF',$aQuality=false,$aBorder=false,$aHorizonPos=0.5) {
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| 110 |
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| 111 | $w = imagesx($aGdImg);
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| 112 | $h = imagesy($aGdImg);
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| 113 |
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| 114 | // Create new image
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| 115 | $hh = $h;
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| 116 | if( $aMinSize )
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| 117 | $ww = ceil($w * $aHorizon / ($aSkewDist+$w));
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| 118 | else
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| 119 | $ww = $w;
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| 120 |
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| 121 | $newgdh = imagecreatetruecolor($ww,$hh);
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| 122 | $crgb = new RGB( $newgdh );
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| 123 | $fillColor = $crgb->Allocate($aFillColor);
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| 124 | imagefilledrectangle($newgdh,0,0,$ww-1,$hh-1,$fillColor);
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| 125 |
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| 126 | if( $aBorder ) {
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| 127 | $colidx = $crgb->Allocate($aBorder);
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| 128 | imagerectangle($newgdh,0,0,$ww-1,$hh-1,$colidx);
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| 129 | }
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| 130 |
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| 131 | $mid = round($h * $aHorizonPos);
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| 132 |
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| 133 | $last = -1;
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| 134 | for($x=0; $x < $w-1; ++$x) {
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| 135 | $xt = floor($x * $aHorizon / ($aSkewDist + $x));
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| 136 | if( !$aQuality ) {
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| 137 | if( $last >= $xt ) continue ;
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| 138 | $last = $xt;
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| 139 | }
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| 140 |
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| 141 | for($y=0; $y < $h; ++$y) {
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| 142 | $yp = $h-$y-1;
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| 143 | $yt = ($yp-$mid) * $aSkewDist / ($aSkewDist + $x);
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| 144 |
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| 145 | if( $aDir == SKEW3D_RIGHT )
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| 146 | $rgb = imagecolorat($aGdImg,$w-$x-1,$y);
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| 147 | else
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| 148 | $rgb = imagecolorat($aGdImg,$x,$y);
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| 149 | $r = ($rgb >> 16) & 0xFF;
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| 150 | $g = ($rgb >> 8) & 0xFF;
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| 151 | $b = $rgb & 0xFF;
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| 152 | $colidx = imagecolorallocate($newgdh,$r,$g,$b);
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| 153 | $yt = floor($hh-$yt-$mid-1);
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| 154 | if( $aDir == SKEW3D_RIGHT ) {
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| 155 | $sxt = $ww-$xt-1;
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| 156 | }
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| 157 | else
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| 158 | $sxt = $xt ;
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| 159 |
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| 160 | if( !empty($set[$xt]) ) {
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| 161 | $nrgb = imagecolorat($newgdh,$sxt,$yt);
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| 162 | $nr = ($nrgb >> 16) & 0xFF;
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| 163 | $ng = ($nrgb >> 8) & 0xFF;
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| 164 | $nb = $nrgb & 0xFF;
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| 165 | $colidx = imagecolorallocate($newgdh,floor(($r+$nr)/2),
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| 166 | floor(($g+$ng)/2),floor(($b+$nb)/2));
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| 167 | }
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| 168 | imagesetpixel($newgdh,$sxt,$yt,$colidx);
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| 169 | }
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| 170 |
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| 171 | $set[$xt] = true;
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| 172 | }
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| 173 |
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| 174 | return $newgdh;
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| 175 | }
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| 176 |
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| 177 | // --------------------------------------------------------------------
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| 178 | // Skew image for the apperance of a 3D effect
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| 179 | // This transforms an image into a 3D-skewed version
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| 180 | // of the image. The transformation is specified by giving the height
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| 181 | // of the artificial horizon and specifying a "skew" factor which
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| 182 | // is the distance on the horizon line between the point of
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| 183 | // convergence and perspective line.
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| 184 | //
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| 185 | // The function returns the GD handle of the transformed image
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| 186 | // leaving the original image untouched.
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| 187 | //
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| 188 | // Parameters:
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| 189 | // * $aGdImg, GD handle to the image to be transformed
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| 190 | // * $aHorizon, Distance to the horizon
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| 191 | // * $aSkewDist, Distance from the horizon point of convergence
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| 192 | // on the horizon line to the perspective points. A larger
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| 193 | // value will fore-shorten the image more
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| 194 | // * $aDir, parameter specifies type of convergence. This of this
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| 195 | // as the walls in a room you are looking at. This specifies if the
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| 196 | // image should be applied on the left,right,top or bottom walls.
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| 197 | // * $aMinSize, true=make the new image just as big as needed,
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| 198 | // false = keep the image the same size as the original image
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| 199 | // * $aFillColor, Background fill color in the image
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| 200 | // * $aHiQuality, true=performa some interpolation that improves
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| 201 | // the image quality but at the expense of performace. Enabling
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| 202 | // high quality will have a dramatic effect on the time it takes
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| 203 | // to transform an image.
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| 204 | // * $aBorder, if set to anything besides false this will draw a
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| 205 | // a border of the speciied color around the image
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| 206 | // --------------------------------------------------------------------
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| 207 | function Skew3D($aHorizon=120,$aSkewDist=150,$aDir=SKEW3D_DOWN,$aHiQuality=false,$aMinSize=true,$aFillColor='#FFFFFF',$aBorder=false) {
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| 208 | return $this->_Skew3D($this->gdImg,$aHorizon,$aSkewDist,$aDir,$aHiQuality,
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| 209 | $aMinSize,$aFillColor,$aBorder);
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| 210 | }
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| 211 |
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| 212 | function _Skew3D($aGdImg,$aHorizon=120,$aSkewDist=150,$aDir=SKEW3D_DOWN,$aHiQuality=false,$aMinSize=true,$aFillColor='#FFFFFF',$aBorder=false) {
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| 213 | if( $aDir == SKEW3D_DOWN || $aDir == SKEW3D_UP )
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| 214 | return $this->_TransVert3D($aGdImg,$aHorizon,$aSkewDist,$aDir,$aMinSize,$aFillColor,$aHiQuality,$aBorder);
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| 215 | else
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| 216 | return $this->_TransHor3D($aGdImg,$aHorizon,$aSkewDist,$aDir,$aMinSize,$aFillColor,$aHiQuality,$aBorder);
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| 217 |
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| 218 | }
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| 219 |
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| 220 | }
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| 221 |
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| 222 |
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| 223 | ?>
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