Annotation of loncom/homework/randomlylabel.pm, revision 1.16
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: #
1.16 ! albertel 5: # $Id: randomlylabel.pm,v 1.15 2004/02/11 21:51:15 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: #
29: ###
30:
31: package Apache::randomlylabel;
32:
33: use strict;
34: use Image::Magick;
35: use Apache::Constants qw(:common);
36: use Apache::loncommon();
1.13 albertel 37: use GD();
38: use GD::Polyline();
1.15 albertel 39: use LWP::UserAgent();
1.3 albertel 40:
41: sub get_image {
42: my ($imgsrc,$set_trans)=@_;
43: my $image;
1.15 albertel 44: &Apache::lonnet::logthis("imagesrc1 is $imgsrc");
45: if ($imgsrc !~ m|^(/home/)|) {
46: &Apache::lonnet::logthis("imagesrc2 is $imgsrc");
47: if ($imgsrc !~ /^http:/) {
48: $imgsrc="http://".$ENV{'HTTP_HOST'}.$imgsrc;
49: }
50: &Apache::lonnet::logthis("imagesrc3 is $imgsrc");
51: &Apache::lonnet::logthis("LWP fetching image $imgsrc");
52: my $ua=new LWP::UserAgent;
53: my $request=new HTTP::Request('GET',"$imgsrc");
54: $request->header(Cookie => $ENV{'HTTP_COOKIE'});
55: my $file="/tmp/imagetmp".$$;
56: my $response=$ua->request($request,$file);
57: &Apache::lonnet::logthis("contetn is ".$response->content_type);
58: &Apache::lonnet::logthis($response->is_success);
59: &Apache::lonnet::logthis($response->status_line);
60: if ($response->is_success) {
61: if ($response->content_type !~ m-/(png|jpg|jpeg)$-i) {
62: my $conv_image = Image::Magick->new;
63: my $current_figure = $conv_image->Read('filename'=>$file);
64: $conv_image->Set('magick'=>'png');
65: my @blobs=$conv_image->ImageToBlob();
66: undef $conv_image;
67: $image = GD::Image->new($blobs[0]);
68: } else {
69: GD::Image->trueColor(1);
70: $image = GD::Image->new($file);
71: }
72: }
73: } elsif ($imgsrc !~ /\.(png|jpg|jpeg)$/i) {
1.3 albertel 74: my $conv_image = Image::Magick->new;
75: my $current_figure = $conv_image->Read('filename'=>$imgsrc);
76: $conv_image->Set('magick'=>'png');
77: my @blobs=$conv_image->ImageToBlob();
78: undef $conv_image;
79: $image = GD::Image->new($blobs[0]);
80: } else {
1.6 albertel 81: GD::Image->trueColor(1);
1.3 albertel 82: $image = GD::Image->new($imgsrc);
83: }
1.9 albertel 84: if ($set_trans && defined($image)) {
1.3 albertel 85: my $white=$image->colorExact(255,255,255);
86: if ($white != -1) { $image->transparent($white); }
87: }
88: return $image;
89: }
1.1 albertel 90:
1.16 ! albertel 91: sub get_color_from_hexstring {
! 92: my ($image,$color)=@_;
! 93: if (!$color) { $color='000000'; }
! 94: my (undef,$red,undef,$green,undef,$blue)=split(/(..)/,$color);
! 95: $red=hex($red);$green=hex($green);$blue=hex($blue);
! 96: my $imcolor;
! 97: if (!($imcolor = $image->colorResolve($red,$green,$blue))) {
! 98: $imcolor = $image->colorClosestHWB($red,$green,$blue);
! 99: }
! 100: return $imcolor;
! 101: }
! 102:
1.1 albertel 103: sub handler {
104: my $r = shift;
105: $r->content_type('image/png');
1.15 albertel 106: $r->send_http_header;
1.11 albertel 107: my (undef,$id) = split(/=/,$ENV{'QUERY_STRING'});
1.15 albertel 108: &Apache::lonnet::logthis("BGIMG is ".$ENV{"cgi.$id.BGIMG"});
1.11 albertel 109: my $image=&get_image(&Apache::lonnet::unescape($ENV{"cgi.$id.BGIMG"}),0);
1.4 matthew 110: if (! defined($image)) {
1.11 albertel 111: &Apache::lonnet::logthis('Unable to create image object for -'.$id.'-'.
112: $ENV{"cgi.$id.BGIMG"});
1.4 matthew 113: return OK;
1.16 ! albertel 114: } elsif (defined($ENV{"cgi.$id.SIZE"})) {
! 115: my ($width,$height)=split(':',$ENV{"cgi.$id.SIZE"});
! 116: $image = new GD::Image($width,$height,1);
! 117: my ($bgcolor)=split(':',$ENV{"cgi.$id.BGCOLOR"});
! 118: if ($bgcolor ne 'transparent') {
! 119: $bgcolor=&get_color_from_hexstring($image,$bgcolor);
! 120: # $image->rectangle(0,0,$width,$height,$bgcolor);
! 121: $image->fill(0,0,$bgcolor);
! 122: } else {
! 123: $bgcolor=&get_color_from_hexstring($image,'FFFFFF');
! 124: $image->fill(0,0,$bgcolor);
! 125: $image->transparent($bgcolor);
! 126: }
! 127: } else {
! 128: &Apache::lonnet::logthis('Unable to create image object, no info');
! 129: return OK;
1.4 matthew 130: }
1.1 albertel 131: #binmode(STDOUT);
1.16 ! albertel 132: my @objtypes=split(':',$ENV{"cgi.$id.OBJTYPE"});
! 133: foreach(my $i=0;$i<$ENV{"cgi.$id.OBJCOUNT"};$i++) {
! 134: my $type=shift(@objtypes);
! 135: &Apache::lonnet::logthis("type is $type");
! 136: if ($type eq 'LINE') {
! 137: my ($x1,$y1,$x2,$y2,$color,$thickness)=
! 138: split(':',$ENV{"cgi.$id.OBJ$i"});
! 139: my $imcolor=&get_color_from_hexstring($image,$color);
! 140: if (!defined($thickness)) { $thickness=1; }
! 141: $image->setThickness($thickness);
! 142: $image->setAntiAliased($imcolor);
! 143: $image->line($x1,$y1,$x2,$y2,gdAntiAliased);
! 144: } elsif ($type eq 'RECTANGLE') {
! 145: my ($x1,$y1,$x2,$y2,$color,$thickness,$filled)=
! 146: split(':',$ENV{"cgi.$id.OBJ$i"});
! 147: if ($x1 > $x2) { my $temp=$x1;$x1=$x2;$x2=$temp; }
! 148: if ($y1 > $y2) { my $temp=$y1;$y1=$y2;$y2=$temp; }
! 149: my $imcolor=&get_color_from_hexstring($image,$color);
! 150: if (!defined($thickness)) { $thickness=1; }
! 151: $image->setThickness($thickness);
! 152: # $image->setAntiAliased($imcolor);
! 153: if ($filled) {
! 154: $image->filledRectangle($x1,$y1,$x2,$y2,$imcolor);
! 155: } else {
! 156: $image->rectangle($x1,$y1,$x2,$y2,$imcolor);
! 157: }
! 158: } elsif ($type eq 'POLYGON') {
! 159: my ($color,$width,$open)=split(':',$ENV{"cgi.$id.OBJ$i"});
! 160: my $imcolor=&get_color_from_hexstring($image,$color);
! 161: my $polygon = (($open) ? (new GD::Polyline) : (new GD::Polygon));
! 162: foreach my $coord (split('-',$ENV{"cgi.$id.OBJEXTRA$i"})) {
! 163: my ($x,$y)=($coord=~m/\(([0-9]+),([0-9]+)\)/);
! 164: $polygon->addPt($x,$y);
! 165: }
! 166: $image->setThickness($width);
! 167: if ($open) {
! 168: $image->polydraw($polygon,$imcolor);
! 169: } else {
! 170: $image->polygon($polygon,$imcolor);
! 171: }
! 172: } elsif ($type eq 'ARC') {
! 173: my ($x,$y,$width,$height,$start,$end,$color,$thickness,$filled)=
! 174: split(':',$ENV{"cgi.$id.OBJ$i"});
! 175: if (!$color) { $color='000000'; }
! 176: my $imcolor=&get_color_from_hexstring($image,$color);
! 177: if (!defined($thickness)) { $thickness=1; }
! 178: $image->setThickness($thickness);
! 179: # $image->setAntiAliased($imcolor);
! 180: if ($filled) {
! 181: $image->filledArc($x,$y,$width,$height,$start,$end,
! 182: $imcolor);
! 183: } else {
! 184: $image->arc($x,$y,$width,$height,$start,$end,$imcolor);
! 185: }
! 186: } elsif ($type eq 'FILL') {
! 187: my ($x,$y,$color)=split(':',$ENV{"cgi.$id.OBJ$i"});
! 188: if (!$color) { $color='000000'; }
! 189: my $imcolor=&get_color_from_hexstring($image,$color);
! 190: $image->fill($x,$y,$imcolor);
! 191: } elsif ($type eq 'IMAGE') {
! 192: my ($x,$y,$file,$transparent)=split(':',$ENV{"cgi.$id.OBJ$i"});
! 193: $file=&Apache::lonnet::unescape($file);
! 194: if (!defined($transparent)) { $transparent=1; }
! 195: my $subimage=&get_image($file,$transparent);
! 196: if (!defined($subimage)) {
! 197: &Apache::lonnet::logthis('Unable to create image object for '.
! 198: $file);
! 199: next;
! 200: }
! 201: $image->copy($subimage,$x,$y,0,0,$subimage->getBounds());
! 202: } elsif ($type eq 'LABEL') {
! 203: my ($x,$y,$text,$font,$color)=split(':',$ENV{"cgi.$id.OBJ$i"});
! 204: $text=&Apache::lonnet::unescape($text);
! 205: my $imcolor=&get_color_from_hexstring($image,$color);
! 206: my $height=GD::Font->Giant->height;
! 207: for(my $i=0;$i<$ENV{"cgi.$id.COUNT"};$i++) {
! 208: $image->string(GD::gdGiantFont,$x,$y-$height,$text,$black);
! 209: }
1.13 albertel 210: }
1.10 albertel 211: }
212: $image->setThickness(1);
1.3 albertel 213: $r->print($image->png);
1.1 albertel 214: return OK;
215: }
216:
217: 1;
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