8ec98c9f
 Guillaume
MAJ
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
|
<?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);
}
}
?>
|