source: trunk/client/modules/Elezioni/grafici/imageSmoothArc.php@ 388

Last change on this file since 388 was 266, checked in by roby, 6 years ago
File size: 13.5 KB
RevLine 
[266]1<?php
2
3/*
4
5 Copyright (c) 2006-2008 Ulrich Mierendorff
6
7 Permission is hereby granted, free of charge, to any person obtaining a
8 copy of this software and associated documentation files (the "Software"),
9 to deal in the Software without restriction, including without limitation
10 the rights to use, copy, modify, merge, publish, distribute, sublicense,
11 and/or sell copies of the Software, and to permit persons to whom the
12 Software is furnished to do so, subject to the following conditions:
13
14 The above copyright notice and this permission notice shall be included in
15 all copies or substantial portions of the Software.
16
17 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
18 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
20 THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
21 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
22 FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
23 DEALINGS IN THE SOFTWARE.
24
25 Changelog:
26 version 1.1
27 - improved the rendering speed by ~20%
28
29 - Thanks to Matthias MÀchler for fixing some small errors:
30 * uninitialized variables
31 * deprecated passing of $img reference in imageSmoothArc ()
32
33 version 1.0
34 Release of rewritten script
35
36*/
37
38function imageSmoothArcDrawSegment (&$img, $cx, $cy, $a, $b, $aaAngleX, $aaAngleY, $color, $start, $stop, $seg)
39{
40 // Originally written from scratch by Ulrich Mierendorff, 06/2006
41 // Rewritten and improved, 04/2007, 07/2007
42
43 // Please do not use THIS function directly. Scroll down to imageSmoothArc(...).
44
45 $fillColor = imageColorExactAlpha( $img, $color[0], $color[1], $color[2], $color[3] );
46
47 $xStart = abs($a * cos($start));
48 $yStart = abs($b * sin($start));
49 $xStop = abs($a * cos($stop));
50 $yStop = abs($b * sin($stop));
51 $dxStart = 0;
52 $dyStart = 0;
53 $dxStop = 0;
54 $dyStop = 0;
55 if ($xStart != 0)
56 $dyStart = $yStart/$xStart;
57 if ($xStop != 0)
58 $dyStop = $yStop/$xStop;
59 if ($yStart != 0)
60 $dxStart = $xStart/$yStart;
61 if ($yStop != 0)
62 $dxStop = $xStop/$yStop;
63 if (abs($xStart) >= abs($yStart)) {
64 $aaStartX = true;
65 } else {
66 $aaStartX = false;
67 }
68 if ($xStop >= $yStop) {
69 $aaStopX = true;
70 } else {
71 $aaStopX = false;
72 }
73 //$xp = +1; $yp = -1; $xa = +1; $ya = 0;
74 for ( $x = 0; $x < $a; $x += 1 ) {
75 /*$y = $b * sqrt( 1 - ($x*$x)/($a*$a) );
76
77 $error = $y - (int)($y);
78 $y = (int)($y);
79
80 $diffColor = imageColorExactAlpha( $img, $color[0], $color[1], $color[2], 127-(127-$color[3])*$error );*/
81
82 $_y1 = $dyStop*$x;
83 $_y2 = $dyStart*$x;
84 if ($xStart > $xStop)
85 {
86 $error1 = $_y1 - (int)($_y1);
87 $error2 = 1 - $_y2 + (int)$_y2;
88 $_y1 = $_y1-$error1;
89 $_y2 = $_y2+$error2;
90 }
91 else
92 {
93 $error1 = 1 - $_y1 + (int)$_y1;
94 $error2 = $_y2 - (int)($_y2);
95 $_y1 = $_y1+$error1;
96 $_y2 = $_y2-$error2;
97 }
98 /*
99 if ($aaStopX)
100 $diffColor1 = imageColorExactAlpha( $img, $color[0], $color[1], $color[2], 127-(127-$color[3])*$error1 );
101 if ($aaStartX)
102 $diffColor2 = imageColorExactAlpha( $img, $color[0], $color[1], $color[2], 127-(127-$color[3])*$error2 );
103 */
104
105 if ($seg == 0 || $seg == 2)
106 {
107 $i = $seg;
108 if (!($start > $i*M_PI/2 && $x > $xStart)) {
109 if ($i == 0) {
110 $xp = +1; $yp = -1; $xa = +1; $ya = 0;
111 } else {
112 $xp = -1; $yp = +1; $xa = 0; $ya = +1;
113 }
114 if ( $stop < ($i+1)*(M_PI/2) && $x <= $xStop ) {
115 $diffColor1 = imageColorExactAlpha( $img, $color[0], $color[1], $color[2], 127-(127-$color[3])*$error1 );
116 $y1 = $_y1; if ($aaStopX) imageSetPixel($img, $cx+$xp*($x)+$xa, $cy+$yp*($y1+1)+$ya, $diffColor1);
117
118 } else {
119 $y = $b * sqrt( 1 - ($x*$x)/($a*$a) );
120 $error = $y - (int)($y);
121 $y = (int)($y);
122 $diffColor = imageColorExactAlpha( $img, $color[0], $color[1], $color[2], 127-(127-$color[3])*$error );
123 $y1 = $y; if ($x < $aaAngleX ) imageSetPixel($img, $cx+$xp*$x+$xa, $cy+$yp*($y1+1)+$ya, $diffColor);
124 }
125 if ($start > $i*M_PI/2 && $x <= $xStart) {
126 $diffColor2 = imageColorExactAlpha( $img, $color[0], $color[1], $color[2], 127-(127-$color[3])*$error2 );
127 $y2 = $_y2; if ($aaStartX) imageSetPixel($img, $cx+$xp*$x+$xa, $cy+$yp*($y2-1)+$ya, $diffColor2);
128 } else {
129 $y2 = 0;
130 }
131 if ($y2 <= $y1) imageLine($img, $cx+$xp*$x+$xa, $cy+$yp*$y1+$ya , $cx+$xp*$x+$xa, $cy+$yp*$y2+$ya, $fillColor);
132 }
133 }
134
135 if ($seg == 1 || $seg == 3)
136 {
137 $i = $seg;
138 if (!($stop < ($i+1)*M_PI/2 && $x > $xStop)) {
139 if ($i == 1) {
140 $xp = -1; $yp = -1; $xa = 0; $ya = 0;
141 } else {
142 $xp = +1; $yp = +1; $xa = 1; $ya = 1;
143 }
144 if ( $start > $i*M_PI/2 && $x < $xStart ) {
145 $diffColor2 = imageColorExactAlpha( $img, $color[0], $color[1], $color[2], 127-(127-$color[3])*$error2 );
146 $y1 = $_y2; if ($aaStartX) imageSetPixel($img, $cx+$xp*$x+$xa, $cy+$yp*($y1+1)+$ya, $diffColor2);
147
148 } else {
149 $y = $b * sqrt( 1 - ($x*$x)/($a*$a) );
150 $error = $y - (int)($y);
151 $y = (int) $y;
152 $diffColor = imageColorExactAlpha( $img, $color[0], $color[1], $color[2], 127-(127-$color[3])*$error );
153 $y1 = $y; if ($x < $aaAngleX ) imageSetPixel($img, $cx+$xp*$x+$xa, $cy+$yp*($y1+1)+$ya, $diffColor);
154 }
155 if ($stop < ($i+1)*M_PI/2 && $x <= $xStop) {
156 $diffColor1 = imageColorExactAlpha( $img, $color[0], $color[1], $color[2], 127-(127-$color[3])*$error1 );
157 $y2 = $_y1; if ($aaStopX) imageSetPixel($img, $cx+$xp*$x+$xa, $cy+$yp*($y2-1)+$ya, $diffColor1);
158 } else {
159 $y2 = 0;
160 }
161 if ($y2 <= $y1) imageLine($img, $cx+$xp*$x+$xa, $cy+$yp*$y1+$ya, $cx+$xp*$x+$xa, $cy+$yp*$y2+$ya, $fillColor);
162 }
163 }
164 }
165
166 ///YYYYY
167
168 for ( $y = 0; $y < $b; $y += 1 ) {
169 /*$x = $a * sqrt( 1 - ($y*$y)/($b*$b) );
170
171 $error = $x - (int)($x);
172 $x = (int)($x);
173
174 $diffColor = imageColorExactAlpha( $img, $color[0], $color[1], $color[2], 127-(127-$color[3])*$error );
175 */
176 $_x1 = $dxStop*$y;
177 $_x2 = $dxStart*$y;
178 if ($yStart > $yStop)
179 {
180 $error1 = $_x1 - (int)($_x1);
181 $error2 = 1 - $_x2 + (int)$_x2;
182 $_x1 = $_x1-$error1;
183 $_x2 = $_x2+$error2;
184 }
185 else
186 {
187 $error1 = 1 - $_x1 + (int)$_x1;
188 $error2 = $_x2 - (int)($_x2);
189 $_x1 = $_x1+$error1;
190 $_x2 = $_x2-$error2;
191 }
192/*
193 if (!$aaStopX)
194 $diffColor1 = imageColorExactAlpha( $img, $color[0], $color[1], $color[2], 127-(127-$color[3])*$error1 );
195 if (!$aaStartX)
196 $diffColor2 = imageColorExactAlpha( $img, $color[0], $color[1], $color[2], 127-(127-$color[3])*$error2 );
197*/
198
199 if ($seg == 0 || $seg == 2)
200 {
201 $i = $seg;
202 if (!($start > $i*M_PI/2 && $y > $yStop)) {
203 if ($i == 0) {
204 $xp = +1; $yp = -1; $xa = 1; $ya = 0;
205 } else {
206 $xp = -1; $yp = +1; $xa = 0; $ya = 1;
207 }
208 if ( $stop < ($i+1)*(M_PI/2) && $y <= $yStop ) {
209 $diffColor1 = imageColorExactAlpha( $img, $color[0], $color[1], $color[2], 127-(127-$color[3])*$error1 );
210 $x1 = $_x1; if (!$aaStopX) imageSetPixel($img, $cx+$xp*($x1-1)+$xa, $cy+$yp*($y)+$ya, $diffColor1);
211 }
212 if ($start > $i*M_PI/2 && $y < $yStart) {
213 $diffColor2 = imageColorExactAlpha( $img, $color[0], $color[1], $color[2], 127-(127-$color[3])*$error2 );
214 $x2 = $_x2; if (!$aaStartX) imageSetPixel($img, $cx+$xp*($x2+1)+$xa, $cy+$yp*($y)+$ya, $diffColor2);
215 } else {
216 $x = $a * sqrt( 1 - ($y*$y)/($b*$b) );
217 $error = $x - (int)($x);
218 $x = (int)($x);
219 $diffColor = imageColorExactAlpha( $img, $color[0], $color[1], $color[2], 127-(127-$color[3])*$error );
220 $x1 = $x; if ($y < $aaAngleY && $y <= $yStop ) imageSetPixel($img, $cx+$xp*($x1+1)+$xa, $cy+$yp*$y+$ya, $diffColor);
221 }
222 }
223 }
224
225 if ($seg == 1 || $seg == 3)
226 {
227 $i = $seg;
228 if (!($stop < ($i+1)*M_PI/2 && $y > $yStart)) {
229 if ($i == 1) {
230 $xp = -1; $yp = -1; $xa = 0; $ya = 0;
231 } else {
232 $xp = +1; $yp = +1; $xa = 1; $ya = 1;
233 }
234 if ( $start > $i*M_PI/2 && $y < $yStart ) {
235 $diffColor2 = imageColorExactAlpha( $img, $color[0], $color[1], $color[2], 127-(127-$color[3])*$error2 );
236 $x1 = $_x2; if (!$aaStartX) imageSetPixel($img, $cx+$xp*($x1-1)+$xa, $cy+$yp*$y+$ya, $diffColor2);
237 }
238 if ($stop < ($i+1)*M_PI/2 && $y <= $yStop) {
239 $diffColor1 = imageColorExactAlpha( $img, $color[0], $color[1], $color[2], 127-(127-$color[3])*$error1 );
240 $x2 = $_x1; if (!$aaStopX) imageSetPixel($img, $cx+$xp*($x2+1)+$xa, $cy+$yp*$y+$ya, $diffColor1);
241 } else {
242 $x = $a * sqrt( 1 - ($y*$y)/($b*$b) );
243 $error = $x - (int)($x);
244 $x = (int)($x);
245 $diffColor = imageColorExactAlpha( $img, $color[0], $color[1], $color[2], 127-(127-$color[3])*$error );
246 $x1 = $x; if ($y < $aaAngleY && $y < $yStart) imageSetPixel($img,$cx+$xp*($x1+1)+$xa, $cy+$yp*$y+$ya, $diffColor);
247 }
248 }
249 }
250 }
251}
252
253
254function imageSmoothArc ( &$img, $cx, $cy, $w, $h, $color, $start, $stop)
255{
256 // Originally written from scratch by Ulrich Mierendorff, 06/2006
257 // Rewritten and improved, 04/2007, 07/2007
258 // compared to old version:
259 // + Support for transparency added
260 // + Improved quality of edges & antialiasing
261
262 // note: This function does not represent the fastest way to draw elliptical
263 // arcs. It was written without reading any papers on that subject. Better
264 // algorithms may be twice as fast or even more.
265
266 // what it cannot do: It does not support outlined arcs, only filled
267
268 // Parameters:
269 // $cx - Center of ellipse, X-coord
270 // $cy - Center of ellipse, Y-coord
271 // $w - Width of ellipse ($w >= 2)
272 // $h - Height of ellipse ($h >= 2 )
273 // $color - Color of ellipse as a four component array with RGBA
274 // $start - Starting angle of the arc, no limited range!
275 // $stop - Stop angle of the arc, no limited range!
276 // $start _can_ be greater than $stop!
277 // If any value is not in the given range, results are undefined!
278
279 // This script does not use any special algorithms, everything is completely
280 // written from scratch; see http://de.wikipedia.org/wiki/Ellipse for formulas.
281
282 while ($start < 0)
283 $start += 2*M_PI;
284 while ($stop < 0)
285 $stop += 2*M_PI;
286
287 while ($start > 2*M_PI)
288 $start -= 2*M_PI;
289
290 while ($stop > 2*M_PI)
291 $stop -= 2*M_PI;
292
293
294 if ($start > $stop)
295 {
296 imageSmoothArc ( $img, $cx, $cy, $w, $h, $color, $start, 2*M_PI);
297 imageSmoothArc ( $img, $cx, $cy, $w, $h, $color, 0, $stop);
298 return;
299 }
300
301 $a = 1.0*round ($w/2);
302 $b = 1.0*round ($h/2);
303 $cx = 1.0*round ($cx);
304 $cy = 1.0*round ($cy);
305
306 $aaAngle = atan(($b*$b)/($a*$a)*tan(0.25*M_PI));
307 $aaAngleX = $a*cos($aaAngle);
308 $aaAngleY = $b*sin($aaAngle);
309
310 $a -= 0.5; // looks better...
311 $b -= 0.5;
312
313 for ($i=0; $i<4;$i++)
314 {
315 if ($start < ($i+1)*M_PI/2)
316 {
317 if ($start > $i*M_PI/2)
318 {
319 if ($stop > ($i+1)*M_PI/2)
320 {
321 imageSmoothArcDrawSegment($img, $cx, $cy, $a, $b, $aaAngleX, $aaAngleY , $color, $start, ($i+1)*M_PI/2, $i);
322 }
323 else
324 {
325 imageSmoothArcDrawSegment($img, $cx, $cy, $a, $b, $aaAngleX, $aaAngleY, $color, $start, $stop, $i);
326 break;
327 }
328 }
329 else
330 {
331 if ($stop > ($i+1)*M_PI/2)
332 {
333 imageSmoothArcDrawSegment($img, $cx, $cy, $a, $b, $aaAngleX, $aaAngleY, $color, $i*M_PI/2, ($i+1)*M_PI/2, $i);
334 }
335 else
336 {
337 imageSmoothArcDrawSegment($img, $cx, $cy, $a, $b, $aaAngleX, $aaAngleY, $color, $i*M_PI/2, $stop, $i);
338 break;
339 }
340 }
341 }
342 }
343}
344?>
Note: See TracBrowser for help on using the repository browser.