source: trunk/client/modules/Elezioni/grafici-old/jpgraph_gradient.php@ 2

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1<?php
2/*=======================================================================
3// File: JPGRAPH_GRADIENT.PHP
4// Description: Create a color gradient
5// Created: 2003-02-01
6// Author: Johan Persson (johanp@aditus.nu)
7// Ver: $Id: jpgraph_gradient.php,v 1.1 2003/02/02 03:55:07 aditus Exp $
8//
9// License: This code is released under QPL
10// Copyright (C) 2003 Johan Persson
11//========================================================================
12*/
13
14
15//===================================================
16// CLASS Gradient
17// Description: Handles gradient fills. This is to be
18// considered a "friend" class of Class Image.
19//===================================================
20class Gradient {
21 var $img=null;
22//---------------
23// CONSTRUCTOR
24 function Gradient(&$img) {
25 $this->img = $img;
26 }
27
28//---------------
29// PUBLIC METHODS
30 // Produce a gradient filled rectangle with a smooth transition between
31 // two colors.
32 // ($xl,$yt) Top left corner
33 // ($xr,$yb) Bottom right
34 // $from_color Starting color in gradient
35 // $to_color End color in the gradient
36 // $style Which way is the gradient oriented?
37 function FilledRectangle($xl,$yt,$xr,$yb,$from_color,$to_color,$style=1) {
38 switch( $style ) {
39 case 1: // HORIZONTAL
40 $steps = abs($xr-$xl);
41 $delta = $xr>=$xl ? 1 : -1;
42 $this->GetColArray($from_color,$to_color,$steps,$colors);
43 for( $i=0, $x=$xl; $i<$steps; ++$i ) {
44 $this->img->current_color = $colors[$i];
45 $this->img->Line($x,$yt,$x,$yb);
46 $x += $delta;
47 }
48 break;
49
50 case 2: // VERTICAL
51 $steps = abs($yb-$yt);
52 $delta = $yb>=$yt ? 1 : -1;
53 $this->GetColArray($from_color,$to_color,$steps,$colors);
54 for($i=0,$y=$yt; $i<$steps; ++$i) {
55 $this->img->current_color = $colors[$i];
56 $this->img->Line($xl,$y,$xr,$y);
57 $y += $delta;
58 }
59 break;
60
61 case 3: // VERTICAL FROM MIDDLE
62 $steps = abs($yb-$yt)/2;
63 $delta = $yb>=$yt ? 1 : -1;
64 $this->GetColArray($from_color,$to_color,$steps,$colors);
65 for($y=$yt, $i=0; $i < $steps; ++$i) {
66 $this->img->current_color = $colors[$i];
67 $this->img->Line($xl,$y,$xr,$y);
68 $y += $delta;
69 }
70 --$i;
71 for($j=0; $j < $steps; ++$j, --$i) {
72 $this->img->current_color = $colors[$i];
73 $this->img->Line($xl,$y,$xr,$y);
74 $y += $delta;
75 }
76 $this->img->Line($xl,$y,$xr,$y);
77 break;
78
79 case 4: // HORIZONTAL FROM MIDDLE
80 $steps = abs($xr-$xl)/2;
81 $delta = $xr>=$xl ? 1 : -1;
82 $this->GetColArray($from_color,$to_color,$steps,$colors);
83 for($x=$xl, $i=0; $i<$steps; ++$i) {
84 $this->img->current_color = $colors[$i];
85 $this->img->Line($x,$yb,$x,$yt);
86 $x += $delta;
87 }
88 --$i;
89 for($j=0; $j<$steps; ++$j, --$i) {
90 $this->img->current_color = $colors[$i];
91 $this->img->Line($x,$yb,$x,$yt);
92 $x += $delta;
93 }
94 $this->img->Line($x,$yb,$x,$yt);
95 break;
96
97 case 6: // HORIZONTAL WIDER MIDDLE
98 $steps = abs($xr-$xl)/3;
99 $delta = $xr>=$xl ? 1 : -1;
100 $this->GetColArray($from_color,$to_color,$steps,$colors);
101 for($x=$xl, $i=0; $i < $steps; ++$i) {
102 $this->img->current_color = $colors[$i];
103 $this->img->Line($x,$yb,$x,$yt);
104 $x += $delta;
105 }
106 --$i;
107 $this->img->current_color = $colors[$i];
108 for($j=0; $j< $steps; ++$j) {
109 $this->img->Line($x,$yb,$x,$yt);
110 $x += $delta;
111 }
112
113 for($j=0; $j<$steps; ++$j, --$i) {
114 $this->img->current_color = $colors[$i];
115 $this->img->Line($x,$yb,$x,$yt);
116 $x += $delta;
117 }
118 break;
119
120
121 case 8: // LEFT REFLECTION
122 $steps1 = round(0.3*abs($xr-$xl));
123 $delta = $xr>=$xl ? 1 : -1;
124
125 $this->GetColArray($from_color.':1.3',$to_color,$steps1,$colors);
126 for($x=$xl, $i=0; $i < $steps1; ++$i) {
127 $this->img->current_color = $colors[$i];
128 $this->img->Line($x,$yb,$x,$yt);
129 $x += $delta;
130 }
131 $steps2 = max(1,round(0.08*abs($xr-$xl)));
132 $this->img->SetColor($to_color);
133 for($j=0; $j< $steps2; ++$j) {
134 $this->img->Line($x,$yb,$x,$yt);
135 $x += $delta;
136 }
137 $steps = abs($xr-$xl)-$steps1-$steps2;
138 $this->GetColArray($to_color,$from_color,$steps,$colors);
139 for($i=0; $i < $steps; ++$i) {
140 $this->img->current_color = $colors[$i];
141 $this->img->Line($x,$yb,$x,$yt);
142 $x += $delta;
143 }
144 break;
145
146 case 9: // RIGHT REFLECTION
147 $steps1 = round(0.7*abs($xr-$xl));
148 $delta = $xr>=$xl ? 1 : -1;
149
150 $this->GetColArray($from_color,$to_color,$steps1,$colors);
151 for($x=$xl, $i=0; $i < $steps1; ++$i) {
152 $this->img->current_color = $colors[$i];
153 $this->img->Line($x,$yb,$x,$yt);
154 $x += $delta;
155 }
156 $steps2 = max(1,round(0.08*abs($xr-$xl)));
157 $this->img->SetColor($to_color);
158 for($j=0; $j< $steps2; ++$j) {
159 $this->img->Line($x,$yb,$x,$yt);
160 $x += $delta;
161 }
162 $steps = abs($xr-$xl)-$steps1-$steps2;
163 $this->GetColArray($to_color,$from_color.':1.3',$steps,$colors);
164 for($i=0; $i < $steps; ++$i) {
165 $this->img->current_color = $colors[$i];
166 $this->img->Line($x,$yb,$x,$yt);
167 $x += $delta;
168 }
169 break;
170
171
172
173 case 7: // VERTICAL WIDER MIDDLE
174 $steps = abs($yb-$yt)/3;
175 $delta = $yb>=$yt? 1 : -1;
176 $this->GetColArray($from_color,$to_color,$steps,$colors);
177 for($y=$yt, $i=0; $i<$steps; ++$i) {
178 $this->img->current_color = $colors[$i];
179 $this->img->Line($xl,$y,$xr,$y);
180 $y += $delta;
181 }
182 --$i;
183 $this->img->current_color = $colors[$i];
184 for($j=0; $j< $steps; ++$j) {
185 $this->img->Line($xl,$y,$xr,$y);
186 $y += $delta;
187 }
188 for($j=0; $j<$steps; ++$j, --$i) {
189 $this->img->current_color = $colors[$i];
190 $this->img->Line($xl,$y,$xr,$y);
191 $y += $delta;
192 }
193 break;
194
195 case 5: // Rectangle
196 $steps = floor(min(($yb-$yt)+1,($xr-$xl)+1)/2);
197 $this->GetColArray($from_color,$to_color,$steps,$colors);
198 $dx = ($xr-$xl)/2;
199 $dy = ($yb-$yt)/2;
200 $x=$xl;$y=$yt;$x2=$xr;$y2=$yb;
201 for($x=$xl, $i=0; $x<$xl+$dx && $y<$yt+$dy ; ++$x, ++$y, --$x2, --$y2, ++$i) {
202 assert($i<count($colors));
203 $this->img->current_color = $colors[$i];
204 $this->img->Rectangle($x,$y,$x2,$y2);
205 }
206 $this->img->Line($x,$y,$x2,$y2);
207 break;
208
209 default:
210 die("JpGraph Error: Unknown gradient style (=$style).");
211 break;
212 }
213 }
214
215//---------------
216// PRIVATE METHODS
217 // Add to the image color map the necessary colors to do the transition
218 // between the two colors using $numcolors intermediate colors
219 function GetColArray($from_color,$to_color,$arr_size,&$colors,$numcols=100) {
220 if( $arr_size==0 ) return;
221 // If color is given as text get it's corresponding r,g,b values
222 $from_color = $this->img->rgb->Color($from_color);
223 $to_color = $this->img->rgb->Color($to_color);
224
225 $rdelta=($to_color[0]-$from_color[0])/$numcols;
226 $gdelta=($to_color[1]-$from_color[1])/$numcols;
227 $bdelta=($to_color[2]-$from_color[2])/$numcols;
228 $colorsperstep = $numcols/$arr_size;
229 $prevcolnum = -1;
230 for ($i=0; $i<$arr_size; ++$i) {
231 $colnum = floor($colorsperstep*$i);
232 if ( $colnum == $prevcolnum )
233 $colors[$i] = $colidx;
234 else {
235 $r = floor($from_color[0] + $colnum*$rdelta);
236 $g = floor($from_color[1] + $colnum*$gdelta);
237 $b = floor($from_color[2] + $colnum*$bdelta);
238 $colidx = $this->img->rgb->Allocate(sprintf("#%02x%02x%02x",$r,$g,$b));
239 $colors[$i] = $colidx;
240 }
241 $prevcolnum = $colnum;
242 }
243 }
244} // Class
245
246?>
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