Annotation of loncom/homework/randomlylabel.pm, revision 1.22
1.1 albertel 1: #!/usr/bin/perl
2: # The LearningOnline Network with CAPA
3: # randomlabel.png: composite together text and images into 1 image
4: #
1.22 ! albertel 5: # $Id: randomlylabel.pm,v 1.21 2004/09/09 07:24:56 albertel Exp $
1.1 albertel 6: #
7: # Copyright Michigan State University Board of Trustees
8: #
9: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
10: #
11: # LON-CAPA is free software; you can redistribute it and/or modify
12: # it under the terms of the GNU General Public License as published by
13: # the Free Software Foundation; either version 2 of the License, or
14: # (at your option) any later version.
15: #
16: # LON-CAPA is distributed in the hope that it will be useful,
17: # but WITHOUT ANY WARRANTY; without even the implied warranty of
18: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19: # GNU General Public License for more details.
20: #
21: # You should have received a copy of the GNU General Public License
22: # along with LON-CAPA; if not, write to the Free Software
23: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
24: #
25: # /home/httpd/html/adm/gpl.txt
26: #
27: # http://www.lon-capa.org/
28: #
1.22 ! albertel 29:
! 30: =pod
! 31:
! 32: =head1 Syntax of randomlylabel commands
! 33:
! 34: =over 4
! 35:
! 36: =item BGIMG
! 37:
! 38: /home/... file or href (href must contain http://...)
! 39: Expected to be HTTP escaped
! 40:
! 41: =item OBJCOUNT
! 42:
! 43: a number
! 44:
! 45: =item OBJTYPE
! 46:
! 47: a colon seperated list of types, supported types are
! 48:
! 49: B<LINE> B<RECTANGLE> B<POLYGON> B<ARC> B<FILL> B<IMAGE> B<LABEL>
! 50:
! 51: =item OBJI<num>
! 52:
! 53: arguments for this OBJ
! 54:
! 55: some common arguments are
! 56:
! 57: =over 4
! 58:
! 59: =item x y thickness
! 60:
! 61: are pixel values
! 62:
! 63: =item color
! 64:
! 65: a hexstring, without with out a leading # or x)
! 66:
! 67: =item filled
! 68:
! 69: boolean, (1 or 0)
! 70:
! 71: =back
! 72:
! 73: The argumants for the possible object types are
! 74:
! 75: =over 4
! 76:
! 77: =item LINE
! 78:
! 79: x1:y1:x2:y2:color:thickness
! 80:
! 81: =item RECTANGLE
! 82:
! 83: x1:y1:x2:y2:color:thickness:filled
! 84:
! 85: =item ARC
! 86:
! 87: x:y:width:height:start:end:color:thickness:filled
! 88:
! 89: =over 4
! 90:
! 91: =item start, end
! 92:
! 93: start and ends of the arc (in degrees)
! 94:
! 95: =back
! 96:
! 97: =item FILL
! 98:
! 99: x:y:color
! 100:
! 101: =item IMAGE
! 102:
! 103: x:y:file:transparent:srcX:srcY:destW:destH:srcW:srcH
! 104:
! 105: =over 4
! 106:
! 107: =item srcX,srcY,srcW,srcH
! 108:
! 109: the start and extant of the region in file to copy to x,y with width/height
! 110: destW destH
! 111:
! 112: =back
! 113:
! 114: =item LABEL
! 115:
! 116: x:y:text:font:color:direction
! 117:
! 118: =over 4
! 119:
! 120: =item text
! 121:
! 122: HTTP escaped string of the text to place on the image
! 123:
! 124: =item font
! 125:
! 126: one of B<tiny>, B<small>, B<medium>, B<large>, B<giant>, or an
! 127: installed TTF font and point size
! 128:
! 129: =item direction
! 130:
! 131: either B<horizontal> or B<vertical>
! 132:
! 133: =back
! 134:
! 135: =item POLYGON
! 136:
! 137: color:width:open:filled
! 138:
! 139: =over 4
! 140:
! 141: =item open
! 142:
! 143: boolean, (1 or 0)
! 144:
! 145: =back
! 146:
! 147: =back
! 148:
! 149:
! 150: =item OBJEXTRAI<num>
! 151:
! 152: extra arguments for object I<num>
! 153:
! 154: The possible values for this for the different object types are
! 155:
! 156: =over 4
! 157:
! 158: =item POLYGON
! 159:
! 160: a list of coords in the form
! 161:
! 162: (x,y)-(x,y)-(x,y)
! 163:
! 164: (there can be arbitrarily many of these)
! 165:
! 166: =back
! 167:
! 168: =back
! 169:
! 170: =head1 Example
! 171:
! 172: BGIMG=file
! 173: OBJTYPE=LINE:LINE:LINE:LINE
! 174: OBJCOUNT=4
! 175: OBJ0=xmin:ymin:xmax:ymax:FFFFFF:3
! 176: OBJ1=xmin:ymax:xmax:ymin:FFFFFF:3
! 177: OBJ2=xmin:ymin:xmax:ymax:FF0000:1
! 178: OBJ3=xmin:ymax:xmax:ymin:FF0000:1
! 179:
! 180: =cut
1.1 albertel 181:
182: package Apache::randomlylabel;
183:
184: use strict;
185: use Image::Magick;
186: use Apache::Constants qw(:common);
187: use Apache::loncommon();
1.17 albertel 188: use GD;
1.13 albertel 189: use GD::Polyline();
1.15 albertel 190: use LWP::UserAgent();
1.3 albertel 191:
192: sub get_image {
193: my ($imgsrc,$set_trans)=@_;
194: my $image;
1.15 albertel 195: if ($imgsrc !~ m|^(/home/)|) {
196: if ($imgsrc !~ /^http:/) {
197: $imgsrc="http://".$ENV{'HTTP_HOST'}.$imgsrc;
198: }
199: my $ua=new LWP::UserAgent;
200: my $request=new HTTP::Request('GET',"$imgsrc");
201: $request->header(Cookie => $ENV{'HTTP_COOKIE'});
202: my $file="/tmp/imagetmp".$$;
203: my $response=$ua->request($request,$file);
204: if ($response->is_success) {
205: if ($response->content_type !~ m-/(png|jpg|jpeg)$-i) {
206: my $conv_image = Image::Magick->new;
207: my $current_figure = $conv_image->Read('filename'=>$file);
1.20 albertel 208: $conv_image->Set('type'=>'TrueColor');
1.15 albertel 209: $conv_image->Set('magick'=>'png');
210: my @blobs=$conv_image->ImageToBlob();
211: undef $conv_image;
212: $image = GD::Image->new($blobs[0]);
213: } else {
214: GD::Image->trueColor(1);
215: $image = GD::Image->new($file);
216: }
217: }
218: } elsif ($imgsrc !~ /\.(png|jpg|jpeg)$/i) {
1.3 albertel 219: my $conv_image = Image::Magick->new;
220: my $current_figure = $conv_image->Read('filename'=>$imgsrc);
1.20 albertel 221: $conv_image->Set('type'=>'TrueColor');
1.3 albertel 222: $conv_image->Set('magick'=>'png');
223: my @blobs=$conv_image->ImageToBlob();
224: undef $conv_image;
225: $image = GD::Image->new($blobs[0]);
226: } else {
1.17 albertel 227: $image = GD::Image->trueColor(1);
1.3 albertel 228: $image = GD::Image->new($imgsrc);
229: }
1.9 albertel 230: if ($set_trans && defined($image)) {
1.3 albertel 231: my $white=$image->colorExact(255,255,255);
232: if ($white != -1) { $image->transparent($white); }
233: }
234: return $image;
235: }
1.1 albertel 236:
1.16 albertel 237: sub get_color_from_hexstring {
238: my ($image,$color)=@_;
239: if (!$color) { $color='000000'; }
240: my (undef,$red,undef,$green,undef,$blue)=split(/(..)/,$color);
241: $red=hex($red);$green=hex($green);$blue=hex($blue);
242: my $imcolor;
243: if (!($imcolor = $image->colorResolve($red,$green,$blue))) {
244: $imcolor = $image->colorClosestHWB($red,$green,$blue);
245: }
246: return $imcolor;
247: }
248:
1.1 albertel 249: sub handler {
250: my $r = shift;
251: $r->content_type('image/png');
1.15 albertel 252: $r->send_http_header;
1.11 albertel 253: my (undef,$id) = split(/=/,$ENV{'QUERY_STRING'});
1.17 albertel 254: my $image;
255: if (defined($ENV{"cgi.$id.BGIMG"})) {
256: my $bgimg=&Apache::lonnet::unescape($ENV{"cgi.$id.BGIMG"});
1.18 albertel 257: #&Apache::lonnet::logthis("BGIMG is ".$bgimg);
1.17 albertel 258: $image=&get_image($bgimg,0);
259: if (! defined($image)) {
260: &Apache::lonnet::logthis('Unable to create image object for -'.
261: $id.'-'.$bgimg);
262: return OK;
263: }
1.16 albertel 264: } elsif (defined($ENV{"cgi.$id.SIZE"})) {
265: my ($width,$height)=split(':',$ENV{"cgi.$id.SIZE"});
266: $image = new GD::Image($width,$height,1);
267: my ($bgcolor)=split(':',$ENV{"cgi.$id.BGCOLOR"});
268: if ($bgcolor ne 'transparent') {
269: $bgcolor=&get_color_from_hexstring($image,$bgcolor);
270: # $image->rectangle(0,0,$width,$height,$bgcolor);
271: $image->fill(0,0,$bgcolor);
272: } else {
273: $bgcolor=&get_color_from_hexstring($image,'FFFFFF');
274: $image->fill(0,0,$bgcolor);
275: $image->transparent($bgcolor);
276: }
277: } else {
278: &Apache::lonnet::logthis('Unable to create image object, no info');
279: return OK;
1.4 matthew 280: }
1.1 albertel 281: #binmode(STDOUT);
1.16 albertel 282: my @objtypes=split(':',$ENV{"cgi.$id.OBJTYPE"});
283: foreach(my $i=0;$i<$ENV{"cgi.$id.OBJCOUNT"};$i++) {
284: my $type=shift(@objtypes);
285: if ($type eq 'LINE') {
286: my ($x1,$y1,$x2,$y2,$color,$thickness)=
287: split(':',$ENV{"cgi.$id.OBJ$i"});
288: my $imcolor=&get_color_from_hexstring($image,$color);
289: if (!defined($thickness)) { $thickness=1; }
290: $image->setThickness($thickness);
1.21 albertel 291: # $image->setAntiAliased($imcolor);
292: $image->line($x1,$y1,$x2,$y2,$imcolor);
1.16 albertel 293: } elsif ($type eq 'RECTANGLE') {
294: my ($x1,$y1,$x2,$y2,$color,$thickness,$filled)=
295: split(':',$ENV{"cgi.$id.OBJ$i"});
296: if ($x1 > $x2) { my $temp=$x1;$x1=$x2;$x2=$temp; }
297: if ($y1 > $y2) { my $temp=$y1;$y1=$y2;$y2=$temp; }
298: my $imcolor=&get_color_from_hexstring($image,$color);
299: if (!defined($thickness)) { $thickness=1; }
300: $image->setThickness($thickness);
301: # $image->setAntiAliased($imcolor);
302: if ($filled) {
303: $image->filledRectangle($x1,$y1,$x2,$y2,$imcolor);
304: } else {
305: $image->rectangle($x1,$y1,$x2,$y2,$imcolor);
306: }
307: } elsif ($type eq 'POLYGON') {
1.21 albertel 308: my ($color,$width,$open,$filled)=split(':',$ENV{"cgi.$id.OBJ$i"});
1.16 albertel 309: my $imcolor=&get_color_from_hexstring($image,$color);
1.21 albertel 310: my $polygon = (($open && lc ($open ne 'no')) ?
311: (new GD::Polyline) : (new GD::Polygon));
1.18 albertel 312: my $added=0;
1.16 albertel 313: foreach my $coord (split('-',$ENV{"cgi.$id.OBJEXTRA$i"})) {
314: my ($x,$y)=($coord=~m/\(([0-9]+),([0-9]+)\)/);
315: $polygon->addPt($x,$y);
1.18 albertel 316: $added++;
1.16 albertel 317: }
1.18 albertel 318:
1.16 albertel 319: $image->setThickness($width);
1.18 albertel 320: if ($added) {
1.21 albertel 321: if ($open && lc($open) ne 'no') {
1.18 albertel 322: $image->polydraw($polygon,$imcolor);
1.21 albertel 323: } elsif ($filled && lc($filled) ne 'no') {
324: $image->filledPolygon($polygon,$imcolor);
1.18 albertel 325: } else {
326: $image->polygon($polygon,$imcolor);
327: }
1.16 albertel 328: }
329: } elsif ($type eq 'ARC') {
330: my ($x,$y,$width,$height,$start,$end,$color,$thickness,$filled)=
331: split(':',$ENV{"cgi.$id.OBJ$i"});
332: if (!$color) { $color='000000'; }
333: my $imcolor=&get_color_from_hexstring($image,$color);
334: if (!defined($thickness)) { $thickness=1; }
335: $image->setThickness($thickness);
336: # $image->setAntiAliased($imcolor);
337: if ($filled) {
338: $image->filledArc($x,$y,$width,$height,$start,$end,
339: $imcolor);
340: } else {
341: $image->arc($x,$y,$width,$height,$start,$end,$imcolor);
342: }
343: } elsif ($type eq 'FILL') {
344: my ($x,$y,$color)=split(':',$ENV{"cgi.$id.OBJ$i"});
345: if (!$color) { $color='000000'; }
346: my $imcolor=&get_color_from_hexstring($image,$color);
347: $image->fill($x,$y,$imcolor);
348: } elsif ($type eq 'IMAGE') {
1.21 albertel 349: my ($x,$y,$file,$transparent,$srcX,$srcY,$destW,$destH,$srcW,
350: $srcH)=split(':',$ENV{"cgi.$id.OBJ$i"});
1.16 albertel 351: $file=&Apache::lonnet::unescape($file);
352: if (!defined($transparent)) { $transparent=1; }
353: my $subimage=&get_image($file,$transparent);
354: if (!defined($subimage)) {
355: &Apache::lonnet::logthis('Unable to create image object for '.
356: $file);
357: next;
358: }
1.21 albertel 359: if (!defined($srcW) or !$srcW) {$srcW=($subimage->getBounds())[0];}
360: if (!defined($srcH) or !$srcH) {$srcH=($subimage->getBounds())[1];}
361: if (!defined($destW) or !$destW) { $destW=$srcW; }
362: if (!defined($destH) or !$destH) { $destH=$srcH; }
363: $image->copyResized($subimage,$x,$y,$srcX,$srcY,$destW,$destH,
364: $srcW,$srcH);
1.16 albertel 365: } elsif ($type eq 'LABEL') {
1.19 albertel 366: my ($x,$y,$text,$font,$color,$direction)=
367: split(':',$ENV{"cgi.$id.OBJ$i"});
1.16 albertel 368: $text=&Apache::lonnet::unescape($text);
369: my $imcolor=&get_color_from_hexstring($image,$color);
1.19 albertel 370: my $type='normal';
371: my ($height,$fontref);
372: if ($font eq 'tiny') {
373: $height=GD::Font->Tiny->height;
374: $fontref=GD::gdTinyFont;
375: } elsif ($font eq 'small') {
376: $height=GD::Font->Small->height;
377: $fontref=GD::gdSmallFont;
378: } elsif ($font eq 'medium') {
379: $height=GD::Font->MediumBold->height;
380: $fontref=GD::gdMediumBoldFont;
381: } elsif ($font eq 'large') {
382: $height=GD::Font->Large->height;
383: $fontref=GD::gdLargeFont;
1.21 albertel 384: } elsif ($font eq 'giant' || !$font) {
1.19 albertel 385: $height=GD::Font->Giant->height;
386: $fontref=GD::gdGiantFont;
387: } else {
388: $type='ttf';
389: }
390: if ($type eq 'normal' && $direction eq 'vertical') {
391: $image->stringUp($fontref,$x,$y-$height,$text,$imcolor);
392: } elsif ($type eq 'normal') {
393: $image->string($fontref,$x,$y-$height,$text,$imcolor);
394: } elsif ($type eq 'ttf') {
395: my ($fontname,$ptsize)=split(/\s+/,$font);
396: $image->stringFT($imcolor,$fontname,$ptsize,90,$x,$y,$text);
397: }
1.18 albertel 398: } else {
399: &Apache::lonnet::logthis("randomlylabel unable to handle object of type $type");
1.13 albertel 400: }
1.10 albertel 401: }
402: $image->setThickness(1);
1.3 albertel 403: $r->print($image->png);
1.1 albertel 404: return OK;
405: }
406:
407: 1;
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