1: # $Id: imagechoice.pm,v 1.10 2006/04/13 18:49:29 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: use Apache::lonnet;
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,$display)=@_;
37: if ($needimage) {
38: $needimage="<img name=\"pickimg\" src=\"$filename\" />";
39: }
40: my $js=<<"ENDSUBM";
41: <script type="text/javascript">
42: function submitthis() {
43: $output
44: self.close();
45: }
46: </script>
47: ENDSUBM
48:
49: my $start_page =
50: &Apache::loncommon::start_page('Close Window',$js,
51: {'bgcolor' => '#FFFFFF',
52: 'only_body' => 1,
53: 'add_entries' => {
54: onload => 'submitthis();'},});
55:
56: my $end_page =
57: &Apache::loncommon::end_page();
58:
59: my $js=<<"ENDSUBM";
60: $start_page
61: <h3>Position Selected</h3>
62: $display
63: $needimage
64: $end_page
65: ENDSUBM
66: }
67:
68: sub storedata {
69: my ($r,$type,$filename,$id)=@_;
70:
71: my (undef,@coords)=split(':',$env{"imagechoice.$id.coords"});
72:
73: my ($output,$needimage);
74:
75: if ($env{"imagechoice.$id.formwidth"}) {
76: $output.='opener.document.forms.'.$env{"imagechoice.$id.formname"}.'.'.$env{"imagechoice.$id.formwidth"}.'.value=document.pickimg.width;';
77: $needimage=1;
78: }
79: if ($env{"imagechoice.$id.formheight"}) {
80: $output.='opener.document.forms.'.$env{"imagechoice.$id.formname"}.'.'.$env{"imagechoice.$id.formheight"}.'.value=document.pickimg.height;';
81: $needimage=1;
82: }
83:
84: my $display;
85: if ($type eq 'point') {
86: my (undef,$x,$y)=split(':',$env{"imagechoice.$id.coords"});
87: if ($env{"imagechoice.$id.formx"}) {
88: $output.='opener.document.forms.'.$env{"imagechoice.$id.formname"}.'.'.$env{"imagechoice.$id.formx"}.'.value='.$x.';';
89: $display.="<p>The X coordinate is $x</p>\n";
90: }
91: if ($env{"imagechoice.$id.formy"}) {
92: $output.='opener.document.forms.'.$env{"imagechoice.$id.formname"}.'.'.$env{"imagechoice.$id.formy"}.'.value='.$y.';';
93: $display.="<p>The Y coordinate is $y</p>\n";
94: }
95: } elsif ($type eq 'polygon' or $type eq 'box') {
96: my $coordstr;
97: while (@coords) {
98: $coordstr.='('.shift(@coords).','.shift(@coords).')-';
99: }
100: chop($coordstr);
101: $display.="<p>The selected coordinates are <tt>$coordstr</tt></p>\n";
102: $output.='opener.document.forms.'.$env{"imagechoice.$id.formname"}.'.'.$env{"imagechoice.$id.formcoord"}.'.value="'.$coordstr.'";';
103: }
104: if ($display) {
105: $display.="<p>If this window fails to close you may need to manually replace the old coordinates with the above value.</p>\n";
106: }
107: &deletedata($id);
108: &closewindow($r,$output,$filename,$needimage,$display);
109: }
110:
111: sub getcoord {
112: my ($r,$type,$filename,$id)=@_;
113: my $heading='Select Position on Image';
114: my $nextstage='';
115: if ($type eq 'box') {
116: my (undef,@coords)=split(':',$env{"imagechoice.$id.coords"});
117: my $step=scalar(@coords)/2;
118: if ($step == 0) {
119: $heading='Select First Coordinate on Image';
120: #$nextstage='<input type="hidden" name="type" value="pairtwo" />';
121: } elsif ($step == 1) {
122: $heading='Select Second Coordinate on Image';
123: #$nextstage='<input type="hidden" name="type" value="pairthree" />';
124: } else {
125: $heading='Select Finish to store selection.';
126: $nextstage='<input type="submit" name="finish" value="Finish" />';
127: }
128: } elsif ($type eq 'polygon') {
129: $heading='Enter Coordinate or click finish to close Polygon';
130: $nextstage='<input type="submit" name="finish" value="Finish" />';
131: } elsif ($type eq 'point') {
132: $heading='Click to select a Coordinate or click Finish to store current selection.';
133: $nextstage='<input type="submit" name="finish" value="Finish" />';
134: }
135:
136: my $start_page =
137: &Apache::loncommon::start_page('Get Coordinates',undef,
138: {'bgcolor' => '#FFFFFF',
139: 'only_body' => 1,});
140:
141: my $end_page =
142: &Apache::loncommon::end_page();
143: $r->print(<<"END");
144: $start_page
145: <h3>$heading</h3>
146: <form method="POST" action="/adm/imagechoice?token=$id">
147: $nextstage
148: <input type="submit" name="cancel" value="Cancel" />
149: <br />
150: <input name="image" type="image" src="$filename" />
151: </form>
152: $end_page
153: END
154: }
155:
156: sub savecoord {
157: my ($id,$type)=@_;
158: if (defined($env{"form.image.x"}) && defined($env{"form.image.y"})) {
159: my $data;
160: if ($type eq 'point') {
161: $data=join(':',(undef,$env{"form.image.x"},$env{"form.image.y"}));
162: } else {
163: $data=join(':',($env{"imagechoice.$id.coords"},
164: $env{"form.image.x"},$env{"form.image.y"}));
165: }
166: &Apache::lonnet::appenv("imagechoice.$id.coords"=>$data);
167: }
168: return int(scalar(split(':',$env{"imagechoice.$id.coords"}))/2);
169: }
170:
171: sub add_obj {
172: my ($x,$id,$type,$args,$extra)=@_;
173:
174: $$x{"cgi.$id.OBJTYPE"}.=$type.':';
175: my $i=$$x{"cgi.$id.OBJCOUNT"}++;
176: $$x{"cgi.$id.OBJ$i"}=$args;
177: if (defined($extra)) { $$x{"cgi.$id.OBJEXTRA$i"}=$extra; }
178: }
179:
180: sub drawX {
181: my ($data,$imid,$x,$y)=@_;
182: my $length = 6;
183: my $width = 1;
184: my $extrawidth = 2;
185: &add_obj($data,$imid,'LINE',
186: join(':',(($x-$length),($y-$length),($x+$length),($y+$length),
187: "FFFFFF",($width+$extrawidth))));
188: &add_obj($data,$imid,'LINE',
189: join(':',(($x-$length),($y+$length),($x+$length),($y-$length),
190: "FFFFFF",($width+$extrawidth))));
191: &add_obj($data,$imid,'LINE',
192: join(':',(($x-$length),($y-$length),($x+$length),($y+$length),
193: "FF0000",($width))));
194: &add_obj($data,$imid,'LINE',
195: join(':',(($x-$length),($y+$length),($x+$length),($y-$length),
196: "FF0000",($width))));
197: }
198:
199: sub drawPolygon {
200: my ($data,$id,$imid)=@_;
201: my (undef,@coords)=split(':',$env{"imagechoice.$id.coords"});
202: my $coordstr;
203: while (@coords) {
204: $coordstr.='('.shift(@coords).','.shift(@coords).')-';
205: }
206: chop($coordstr);
207: my $width = 1;
208: my $extrawidth = 2;
209: &add_obj($data,$imid,'POLYGON',
210: join(':',("FFFFFF",($width+$extrawidth)),'1'),$coordstr);
211: &add_obj($data,$imid,'POLYGON',
212: join(':',("00FF00",($width)),'1'),$coordstr);
213: }
214:
215: sub drawBox {
216: my ($data,$id,$imid)=@_;
217: my (undef,@coords)=split(':',$env{"imagechoice.$id.coords"});
218: if (scalar(@coords) < 4) { return ''; }
219: my $width = 1;
220: my $extrawidth = 2;
221: &add_obj($data,$imid,'RECTANGLE',
222: join(':',(@coords,"FFFFFF",($width+$extrawidth))));
223: &add_obj($data,$imid,'RECTANGLE',join(':',(@coords,"00FF00",$width)));
224: }
225:
226: sub drawimage {
227: my ($r,$type,$filename,$id)=@_;
228: my $imid=&Apache::loncommon::get_cgi_id();
229: my (undef,@coords)=split(':',$env{"imagechoice.$id.coords"});
230: if (scalar(@coords) < 2) { return &Apache::lonnet::hreflocation('',$filename); }
231: my %data;
232: $data{"cgi.$imid.BGIMG"}=$filename;
233: my $x=$coords[-2];
234: my $y=$coords[-1];
235: &drawX(\%data,$imid,$x,$y);
236: if ($type eq "polygon") { &drawPolygon(\%data,$id,$imid); }
237: if ($type eq "box") { &drawBox(\%data,$id,$imid); }
238: &Apache::lonnet::appenv(%data);
239: return "/adm/randomlabel.png?token=$imid"
240: }
241:
242: sub handler {
243: my ($r)=@_;
244: &Apache::loncommon::content_type($r,'text/html');
245: $r->send_http_header;
246: my %data;
247: my (undef,$id) = split(/=/,$ENV{'QUERY_STRING'});
248: my $filename = &Apache::lonnet::unescape($env{"imagechoice.$id.file"});
249: my $formname = $env{"imagechoice.$id.formname"};
250: if ($env{'form.cancel'} eq 'Cancel') {
251: &deletedata($id);
252: &closewindow($r,'',$filename);
253: return OK;
254: }
255: my $type=$env{"imagechoice.$id.type"};
256: if (defined($env{'form.type'})) { $type=$env{'form.type'}; }
257: my $numcoords=&savecoord($id,$type);
258: my $imurl=&drawimage($r,$type,$filename,$id);
259: if (($env{'form.finish'} eq 'Finish')) {
260: &storedata($r,$type,$imurl,$id);
261: } else {
262: &getcoord($r,$type,$imurl,$id);
263: }
264: return OK;
265: }
266:
267: 1;
268:
269: __END__
270:
271:
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