1: # $Id: imagechoice.pm,v 1.3 2004/01/14 22:59:18 albertel Exp $
2: #
3: # Copyright Michigan State University Board of Trustees
4: #
5: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
6: #
7: # LON-CAPA is free software; you can redistribute it and/or modify
8: # it under the terms of the GNU General Public License as published by
9: # the Free Software Foundation; either version 2 of the License, or
10: # (at your option) any later version.
11: #
12: # LON-CAPA is distributed in the hope that it will be useful,
13: # but WITHOUT ANY WARRANTY; without even the implied warranty of
14: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15: # GNU General Public License for more details.
16: #
17: # You should have received a copy of the GNU General Public License
18: # along with LON-CAPA; if not, write to the Free Software
19: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20: #
21: # /home/httpd/cgi-bin/plot.gif
22: #
23: # http://www.lon-capa.org/
24: #
25: package Apache::imagechoice;
26: use strict;
27: use Apache::Constants qw(:common :http);
28:
29:
30: sub deletedata {
31: my ($id)=@_;
32: &Apache::lonnet::delenv("imagechoice\\.$id\\.coords");
33: }
34:
35: sub closewindow {
36: my ($r,$output,$filename)=@_;
37: $r->print(<<"ENDSUBM");
38: <html>
39: <script>
40: function submitthis() {
41: $output
42: self.close();
43: }
44: </script>
45: <body bgcolor="#FFFFFF" onLoad="submitthis()">
46: <h3>Position Selected</h3>
47: <!--<img name="pickimg" src="$filename" />-->
48: </body>
49: </html>
50: ENDSUBM
51: }
52:
53: sub storedata {
54: my ($r,$type,$filename,$id)=@_;
55:
56: my (undef,@coords)=split(':',$ENV{"imagechoice.$id.coords"});
57:
58: my $output;
59:
60: if ($ENV{"imagechoice.$id.formwidth"}) {
61: $output.='opener.document.forms.'.$ENV{"imagechoice.$id.formname"}.'.'.$ENV{"imagechoice.$id.formwidth"}.'.value=document.pickimg.width;';
62: }
63: if ($ENV{"imagechoice.$id.formheight"}) {
64: $output.='opener.document.forms.'.$ENV{"imagechoice.$id.formname"}.'.'.$ENV{"imagechoice.$id.formheight"}.'.value=document.pickimg.height;';
65: }
66:
67: if ((defined($ENV{"imagechoice.$id.x"})) && (defined($ENV{"imagechoice.$id.y"})) &&
68: ($type ne 'pairtwo') && ($type ne 'pairthree')) {
69: my $output='';
70: if ($ENV{"imagechoice.$id.formx"}) {
71: $output.='opener.document.forms.'.$ENV{"imagechoice.$id.formname"}.'.'.$ENV{"imagechoice.$id.formx"}.
72: '.value='.$ENV{"imagechoice.$id.x"}.';';
73: }
74: if ($ENV{"imagechoice.$id.formy"}) {
75: $output.='opener.document.forms.'.$ENV{"imagechoice.$id.formname"}.'.'.$ENV{"imagechoice.$id.formy"}.
76: '.value='.$ENV{"imagechoice.$id.y"}.';';
77: }
78: } elsif ($type eq 'polygon' or $type eq 'box') {
79: my $coordstr;
80: while (@coords) {
81: $coordstr.='('.shift(@coords).','.shift(@coords).')-';
82: }
83: chop($coordstr);
84: $output.='opener.document.forms.'.$ENV{"imagechoice.$id.formname"}.'.'.$ENV{"imagechoice.$id.formcoord"}.'.value="'.$coordstr.'";';
85: }
86: &deletedata($id);
87: &closewindow($r,$output,$filename);
88: }
89:
90: sub getcoord {
91: my ($r,$type,$filename,$id)=@_;
92: my $heading='Position';
93: my $nextstage='';
94: if ($type eq 'box') {
95: my (undef,@coords)=split(':',$ENV{"imagechoice.$id.coords"});
96: my $step=scalar(@coords)/2;
97: if ($step == 0) {
98: $heading='First Coordinate';
99: #$nextstage='<input type="hidden" name="type" value="pairtwo" />';
100: } elsif ($step == 1) {
101: $heading='Second Coordinate';
102: #$nextstage='<input type="hidden" name="type" value="pairthree" />';
103: } else {
104: $heading='Finish or Cancel';
105: $nextstage='<input type="submit" name="finish" value="Finish" />';
106: }
107: } elsif ($type eq 'polygon') {
108: $heading='Enter Coordinate or click finish to close Polygon';
109: $nextstage='<input type="submit" name="finish" value="Finish" />';
110: }
111: $r->print(<<"END");
112: <html>
113: <body bgcolor="#FFFFFF">
114: <h3>Select $heading on Image</h3>
115: <form method="POST" action="/adm/imagechoice?token=$id">
116: $nextstage
117: <input type="submit" name="cancel" value="Cancel" />
118: <br />
119: <input name="image" type="image" src="$filename" />
120: </form>
121: </body>
122: </html>
123: END
124: }
125:
126: sub savecoord {
127: my ($id)=@_;
128: if (defined($ENV{"form.image.x"}) && defined($ENV{"form.image.y"})) {
129: my $data=join(':',($ENV{"imagechoice.$id.coords"},$ENV{"form.image.x"},
130: $ENV{"form.image.y"}));
131: &Apache::lonnet::appenv("imagechoice.$id.coords"=>$data);
132: }
133: return int(scalar(split(':',$ENV{"imagechoice.$id.coords"}))/2);
134: }
135:
136: sub drawX {
137: my ($imid,$x,$y)=@_;
138: my %x;
139: $x{"cgi.$imid.LINECOUNT"}=4;
140: my $length = 6;
141: my $width = 1;
142: my $extrawidth = 2;
143: $x{"cgi.$imid.LINE0"}=
144: join(':',(($x-$length),($y-$length),($x+$length),($y+$length),
145: "FFFFFF",($width+$extrawidth)));
146: $x{"cgi.$imid.LINE1"}=
147: join(':',(($x-$length),($y+$length),($x+$length),($y-$length),
148: "FFFFFF",($width+$extrawidth)));
149: $x{"cgi.$imid.LINE2"}=
150: join(':',(($x-$length),($y-$length),($x+$length),($y+$length),
151: "FF0000",($width)));
152: $x{"cgi.$imid.LINE3"}=
153: join(':',(($x-$length),($y+$length),($x+$length),($y-$length),
154: "FF0000",($width)));
155: return %x;
156: }
157:
158: sub drawPolygon {
159: my ($id,$imid)=@_;
160: my (undef,@coords)=split(':',$ENV{"imagechoice.$id.coords"});
161: my $coordstr;
162: while (@coords) {
163: $coordstr.='('.shift(@coords).','.shift(@coords).')-';
164: }
165: chop($coordstr);
166: my %x;
167: my $width = 1;
168: my $extrawidth = 2;
169: my $i=$x{"cgi.$imid.POLYCOUNT"}++;
170: $x{"cgi.$imid.POLYOPT$i"}=join(':',("FFFFFF",($width+$extrawidth)),'1');
171: $x{"cgi.$imid.POLY$i"}=$coordstr;
172: $i=$x{"cgi.$imid.POLYCOUNT"}++;
173: $x{"cgi.$imid.POLYOPT$i"}=join(':',("00FF00",$width),'1');
174: $x{"cgi.$imid.POLY$i"}=$coordstr;
175: return %x;
176: }
177:
178: sub drawBox {
179: my ($id,$imid)=@_;
180: my (undef,@coords)=split(':',$ENV{"imagechoice.$id.coords"});
181: my %x;
182: if (scalar(@coords) < 4) { return %x; }
183: my $width = 1;
184: my $extrawidth = 2;
185: my $i=$x{"cgi.$imid.BOXCOUNT"}++;
186: $x{"cgi.$imid.BOX$i"}=join(':',(@coords,"FFFFFF",($width+$extrawidth)));
187: $i=$x{"cgi.$imid.BOXCOUNT"}++;
188: $x{"cgi.$imid.BOX$i"}=join(':',(@coords,"00FF00",$width));
189: return %x;
190: }
191:
192: sub drawimage {
193: my ($r,$type,$filename,$id)=@_;
194: my $imid=&Apache::loncommon::get_cgi_id();
195: my (undef,@coords)=split(':',$ENV{"imagechoice.$id.coords"});
196: if (scalar(@coords) < 2) { return &Apache::lonnet::hreflocation('',$filename); }
197: my %data;
198: $data{"cgi.$imid.BGIMG"}=$filename;
199: my $x=$coords[-2];
200: my $y=$coords[-1];
201: %data=(%data,&drawX($imid,$x,$y));
202: if ($type eq "polygon") { %data=(%data,&drawPolygon($id,$imid)); }
203: if ($type eq "box") { %data=(%data,&drawBox($id,$imid)); }
204: &Apache::lonnet::appenv(%data);
205: return "/adm/randomlabel.png?token=$imid"
206: }
207:
208: sub handler {
209: my ($r)=@_;
210: $r->content_type('text/html');
211: my %data;
212: my (undef,$id) = split(/=/,$ENV{'QUERY_STRING'});
213: my $filename = &Apache::lonnet::unescape($ENV{"imagechoice.$id.file"});
214: my $formname = $ENV{"imagechoice.$id.formname"};
215: if ($ENV{'form.cancel'} eq 'Cancel') {
216: &deletedata($id);
217: &closewindow($r,'',$filename);
218: return OK;
219: }
220: my $type=$ENV{"imagechoice.$id.type"};
221: if (defined($ENV{'form.type'})) { $type=$ENV{'form.type'}; }
222: my $numcoords=&savecoord($id);
223: &Apache::lonnet::logthis("num coords is $numcoords");
224: my $imurl=&drawimage($r,$type,$filename,$id);
225: if (($ENV{'form.finish'} eq 'Finish')) {
226: &storedata($r,$type,$imurl,$id);
227: } else {
228: &getcoord($r,$type,$imurl,$id);
229: }
230: return OK;
231: }
232:
233: 1;
234:
235: __END__
236:
237:
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