File:
[LON-CAPA] /
loncom /
homework /
imagechoice.pm
Revision
1.5:
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Tue Feb 24 00:14:01 2004 UTC (20 years, 2 months ago) by
albertel
Branches:
MAIN
CVS tags:
version_1_2_X,
version_1_2_1,
version_1_2_0,
version_1_1_99_5,
version_1_1_99_4,
version_1_1_99_3,
version_1_1_99_2,
version_1_1_99_1,
version_1_1_99_0,
HEAD
- converted to new randomlylabe syntax
1: # $Id: imagechoice.pm,v 1.5 2004/02/24 00:14:01 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,$filename,$needimage)=@_;
37: if ($needimage) {
38: $needimage="<img name=\"pickimg\" src=\"$filename\" />";
39: }
40: $r->print(<<"ENDSUBM");
41: <html>
42: <script>
43: function submitthis() {
44: $output
45: self.close();
46: }
47: </script>
48: <body bgcolor="#FFFFFF" onLoad="submitthis()">
49: <h3>Position Selected</h3>
50: $needimage
51: </body>
52: </html>
53: ENDSUBM
54: }
55:
56: sub storedata {
57: my ($r,$type,$filename,$id)=@_;
58:
59: my (undef,@coords)=split(':',$ENV{"imagechoice.$id.coords"});
60:
61: my ($output,$needimage);
62:
63: if ($ENV{"imagechoice.$id.formwidth"}) {
64: $output.='opener.document.forms.'.$ENV{"imagechoice.$id.formname"}.'.'.$ENV{"imagechoice.$id.formwidth"}.'.value=document.pickimg.width;';
65: $needimage=1;
66: }
67: if ($ENV{"imagechoice.$id.formheight"}) {
68: $output.='opener.document.forms.'.$ENV{"imagechoice.$id.formname"}.'.'.$ENV{"imagechoice.$id.formheight"}.'.value=document.pickimg.height;';
69: $needimage=1;
70: }
71:
72: if ($type eq 'point') {
73: my (undef,$x,$y)=split(':',$ENV{"imagechoice.$id.coords"});
74: if ($ENV{"imagechoice.$id.formx"}) {
75: $output.='opener.document.forms.'.$ENV{"imagechoice.$id.formname"}.'.'.$ENV{"imagechoice.$id.formx"}.'.value='.$x.';';
76: }
77: if ($ENV{"imagechoice.$id.formy"}) {
78: $output.='opener.document.forms.'.$ENV{"imagechoice.$id.formname"}.'.'.$ENV{"imagechoice.$id.formy"}.'.value='.$y.';';
79: }
80: } elsif ($type eq 'polygon' or $type eq 'box') {
81: my $coordstr;
82: while (@coords) {
83: $coordstr.='('.shift(@coords).','.shift(@coords).')-';
84: }
85: chop($coordstr);
86: $output.='opener.document.forms.'.$ENV{"imagechoice.$id.formname"}.'.'.$ENV{"imagechoice.$id.formcoord"}.'.value="'.$coordstr.'";';
87: }
88:
89: &deletedata($id);
90: &closewindow($r,$output,$filename,$needimage);
91: }
92:
93: sub getcoord {
94: my ($r,$type,$filename,$id)=@_;
95: my $heading='Select Position on Image';
96: my $nextstage='';
97: if ($type eq 'box') {
98: my (undef,@coords)=split(':',$ENV{"imagechoice.$id.coords"});
99: my $step=scalar(@coords)/2;
100: if ($step == 0) {
101: $heading='Select First Coordinate on Image';
102: #$nextstage='<input type="hidden" name="type" value="pairtwo" />';
103: } elsif ($step == 1) {
104: $heading='Select Second Coordinate on Image';
105: #$nextstage='<input type="hidden" name="type" value="pairthree" />';
106: } else {
107: $heading='Select Finish to store selection.';
108: $nextstage='<input type="submit" name="finish" value="Finish" />';
109: }
110: } elsif ($type eq 'polygon') {
111: $heading='Enter Coordinate or click finish to close Polygon';
112: $nextstage='<input type="submit" name="finish" value="Finish" />';
113: } elsif ($type eq 'point') {
114: $heading='Click to select a Coordinate or click Finish to store current selection.';
115: $nextstage='<input type="submit" name="finish" value="Finish" />';
116: }
117: $r->print(<<"END");
118: <html>
119: <body bgcolor="#FFFFFF">
120: <h3>$heading</h3>
121: <form method="POST" action="/adm/imagechoice?token=$id">
122: $nextstage
123: <input type="submit" name="cancel" value="Cancel" />
124: <br />
125: <input name="image" type="image" src="$filename" />
126: </form>
127: </body>
128: </html>
129: END
130: }
131:
132: sub savecoord {
133: my ($id,$type)=@_;
134: if (defined($ENV{"form.image.x"}) && defined($ENV{"form.image.y"})) {
135: my $data;
136: if ($type eq 'point') {
137: $data=join(':',(undef,$ENV{"form.image.x"},$ENV{"form.image.y"}));
138: } else {
139: $data=join(':',($ENV{"imagechoice.$id.coords"},
140: $ENV{"form.image.x"},$ENV{"form.image.y"}));
141: }
142: &Apache::lonnet::appenv("imagechoice.$id.coords"=>$data);
143: }
144: return int(scalar(split(':',$ENV{"imagechoice.$id.coords"}))/2);
145: }
146:
147: sub add_obj {
148: my ($x,$id,$type,$args,$extra)=@_;
149:
150: $$x{"cgi.$id.OBJTYPE"}.=$type.':';
151: my $i=$$x{"cgi.$id.OBJCOUNT"}++;
152: $$x{"cgi.$id.OBJ$i"}=$args;
153: if (defined($extra)) { $$x{"cgi.$id.OBJEXTRA$i"}=$extra; }
154: }
155:
156: sub drawX {
157: my ($data,$imid,$x,$y)=@_;
158: my $length = 6;
159: my $width = 1;
160: my $extrawidth = 2;
161: &add_obj($data,$imid,'LINE',
162: join(':',(($x-$length),($y-$length),($x+$length),($y+$length),
163: "FFFFFF",($width+$extrawidth))));
164: &add_obj($data,$imid,'LINE',
165: join(':',(($x-$length),($y+$length),($x+$length),($y-$length),
166: "FFFFFF",($width+$extrawidth))));
167: &add_obj($data,$imid,'LINE',
168: join(':',(($x-$length),($y-$length),($x+$length),($y+$length),
169: "FF0000",($width))));
170: &add_obj($data,$imid,'LINE',
171: join(':',(($x-$length),($y+$length),($x+$length),($y-$length),
172: "FF0000",($width))));
173: }
174:
175: sub drawPolygon {
176: my ($data,$id,$imid)=@_;
177: my (undef,@coords)=split(':',$ENV{"imagechoice.$id.coords"});
178: my $coordstr;
179: while (@coords) {
180: $coordstr.='('.shift(@coords).','.shift(@coords).')-';
181: }
182: chop($coordstr);
183: my $width = 1;
184: my $extrawidth = 2;
185: &add_obj($data,$imid,'POLYGON',
186: join(':',("FFFFFF",($width+$extrawidth)),'1'),$coordstr);
187: &add_obj($data,$imid,'POLYGON',
188: join(':',("00FF00",($width)),'1'),$coordstr);
189: }
190:
191: sub drawBox {
192: my ($data,$id,$imid)=@_;
193: my (undef,@coords)=split(':',$ENV{"imagechoice.$id.coords"});
194: if (scalar(@coords) < 4) { return ''; }
195: my $width = 1;
196: my $extrawidth = 2;
197: &add_obj($data,$imid,'RECTANGLE',
198: join(':',(@coords,"FFFFFF",($width+$extrawidth))));
199: &add_obj($data,$imid,'RECTANGLE',join(':',(@coords,"00FF00",$width)));
200: }
201:
202: sub drawimage {
203: my ($r,$type,$filename,$id)=@_;
204: my $imid=&Apache::loncommon::get_cgi_id();
205: my (undef,@coords)=split(':',$ENV{"imagechoice.$id.coords"});
206: if (scalar(@coords) < 2) { return &Apache::lonnet::hreflocation('',$filename); }
207: my %data;
208: $data{"cgi.$imid.BGIMG"}=$filename;
209: my $x=$coords[-2];
210: my $y=$coords[-1];
211: &drawX(\%data,$imid,$x,$y);
212: if ($type eq "polygon") { &drawPolygon(\%data,$id,$imid); }
213: if ($type eq "box") { &drawBox(\%data,$id,$imid); }
214: &Apache::lonnet::appenv(%data);
215: return "/adm/randomlabel.png?token=$imid"
216: }
217:
218: sub handler {
219: my ($r)=@_;
220: $r->content_type('text/html');
221: my %data;
222: my (undef,$id) = split(/=/,$ENV{'QUERY_STRING'});
223: my $filename = &Apache::lonnet::unescape($ENV{"imagechoice.$id.file"});
224: my $formname = $ENV{"imagechoice.$id.formname"};
225: if ($ENV{'form.cancel'} eq 'Cancel') {
226: &deletedata($id);
227: &closewindow($r,'',$filename);
228: return OK;
229: }
230: my $type=$ENV{"imagechoice.$id.type"};
231: if (defined($ENV{'form.type'})) { $type=$ENV{'form.type'}; }
232: my $numcoords=&savecoord($id,$type);
233: &Apache::lonnet::logthis("num coords is $numcoords");
234: my $imurl=&drawimage($r,$type,$filename,$id);
235: if (($ENV{'form.finish'} eq 'Finish')) {
236: &storedata($r,$type,$imurl,$id);
237: } else {
238: &getcoord($r,$type,$imurl,$id);
239: }
240: return OK;
241: }
242:
243: 1;
244:
245: __END__
246:
247:
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