1: # $Id: imagechoice.pm,v 1.11 2006/05/30 12:45:37 www 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: use lib '/home/httpd/lib/perl/';
30: use LONCAPA;
31:
32:
33: sub deletedata {
34: my ($id)=@_;
35: &Apache::lonnet::delenv("imagechoice\\.$id\\.coords");
36: }
37:
38: sub closewindow {
39: my ($r,$output,$filename,$needimage,$display)=@_;
40: if ($needimage) {
41: $needimage="<img name=\"pickimg\" src=\"$filename\" />";
42: }
43: my $js=<<"ENDSUBM";
44: <script type="text/javascript">
45: function submitthis() {
46: $output
47: self.close();
48: }
49: </script>
50: ENDSUBM
51:
52: my $start_page =
53: &Apache::loncommon::start_page('Close Window',$js,
54: {'bgcolor' => '#FFFFFF',
55: 'only_body' => 1,
56: 'add_entries' => {
57: onload => 'submitthis();'},});
58:
59: my $end_page =
60: &Apache::loncommon::end_page();
61:
62: my $js=<<"ENDSUBM";
63: $start_page
64: <h3>Position Selected</h3>
65: $display
66: $needimage
67: $end_page
68: ENDSUBM
69: }
70:
71: sub storedata {
72: my ($r,$type,$filename,$id)=@_;
73:
74: my (undef,@coords)=split(':',$env{"imagechoice.$id.coords"});
75:
76: my ($output,$needimage);
77:
78: if ($env{"imagechoice.$id.formwidth"}) {
79: $output.='opener.document.forms.'.$env{"imagechoice.$id.formname"}.'.'.$env{"imagechoice.$id.formwidth"}.'.value=document.pickimg.width;';
80: $needimage=1;
81: }
82: if ($env{"imagechoice.$id.formheight"}) {
83: $output.='opener.document.forms.'.$env{"imagechoice.$id.formname"}.'.'.$env{"imagechoice.$id.formheight"}.'.value=document.pickimg.height;';
84: $needimage=1;
85: }
86:
87: my $display;
88: if ($type eq 'point') {
89: my (undef,$x,$y)=split(':',$env{"imagechoice.$id.coords"});
90: if ($env{"imagechoice.$id.formx"}) {
91: $output.='opener.document.forms.'.$env{"imagechoice.$id.formname"}.'.'.$env{"imagechoice.$id.formx"}.'.value='.$x.';';
92: $display.="<p>The X coordinate is $x</p>\n";
93: }
94: if ($env{"imagechoice.$id.formy"}) {
95: $output.='opener.document.forms.'.$env{"imagechoice.$id.formname"}.'.'.$env{"imagechoice.$id.formy"}.'.value='.$y.';';
96: $display.="<p>The Y coordinate is $y</p>\n";
97: }
98: } elsif ($type eq 'polygon' or $type eq 'box') {
99: my $coordstr;
100: while (@coords) {
101: $coordstr.='('.shift(@coords).','.shift(@coords).')-';
102: }
103: chop($coordstr);
104: $display.="<p>The selected coordinates are <tt>$coordstr</tt></p>\n";
105: $output.='opener.document.forms.'.$env{"imagechoice.$id.formname"}.'.'.$env{"imagechoice.$id.formcoord"}.'.value="'.$coordstr.'";';
106: }
107: if ($display) {
108: $display.="<p>If this window fails to close you may need to manually replace the old coordinates with the above value.</p>\n";
109: }
110: &deletedata($id);
111: &closewindow($r,$output,$filename,$needimage,$display);
112: }
113:
114: sub getcoord {
115: my ($r,$type,$filename,$id)=@_;
116: my $heading='Select Position on Image';
117: my $nextstage='';
118: if ($type eq 'box') {
119: my (undef,@coords)=split(':',$env{"imagechoice.$id.coords"});
120: my $step=scalar(@coords)/2;
121: if ($step == 0) {
122: $heading='Select First Coordinate on Image';
123: #$nextstage='<input type="hidden" name="type" value="pairtwo" />';
124: } elsif ($step == 1) {
125: $heading='Select Second Coordinate on Image';
126: #$nextstage='<input type="hidden" name="type" value="pairthree" />';
127: } else {
128: $heading='Select Finish to store selection.';
129: $nextstage='<input type="submit" name="finish" value="Finish" />';
130: }
131: } elsif ($type eq 'polygon') {
132: $heading='Enter Coordinate or click finish to close Polygon';
133: $nextstage='<input type="submit" name="finish" value="Finish" />';
134: } elsif ($type eq 'point') {
135: $heading='Click to select a Coordinate or click Finish to store current selection.';
136: $nextstage='<input type="submit" name="finish" value="Finish" />';
137: }
138:
139: my $start_page =
140: &Apache::loncommon::start_page('Get Coordinates',undef,
141: {'bgcolor' => '#FFFFFF',
142: 'only_body' => 1,});
143:
144: my $end_page =
145: &Apache::loncommon::end_page();
146: $r->print(<<"END");
147: $start_page
148: <h3>$heading</h3>
149: <form method="POST" action="/adm/imagechoice?token=$id">
150: $nextstage
151: <input type="submit" name="cancel" value="Cancel" />
152: <br />
153: <input name="image" type="image" src="$filename" />
154: </form>
155: $end_page
156: END
157: }
158:
159: sub savecoord {
160: my ($id,$type)=@_;
161: if (defined($env{"form.image.x"}) && defined($env{"form.image.y"})) {
162: my $data;
163: if ($type eq 'point') {
164: $data=join(':',(undef,$env{"form.image.x"},$env{"form.image.y"}));
165: } else {
166: $data=join(':',($env{"imagechoice.$id.coords"},
167: $env{"form.image.x"},$env{"form.image.y"}));
168: }
169: &Apache::lonnet::appenv("imagechoice.$id.coords"=>$data);
170: }
171: return int(scalar(split(':',$env{"imagechoice.$id.coords"}))/2);
172: }
173:
174: sub add_obj {
175: my ($x,$id,$type,$args,$extra)=@_;
176:
177: $$x{"cgi.$id.OBJTYPE"}.=$type.':';
178: my $i=$$x{"cgi.$id.OBJCOUNT"}++;
179: $$x{"cgi.$id.OBJ$i"}=$args;
180: if (defined($extra)) { $$x{"cgi.$id.OBJEXTRA$i"}=$extra; }
181: }
182:
183: sub drawX {
184: my ($data,$imid,$x,$y)=@_;
185: my $length = 6;
186: my $width = 1;
187: my $extrawidth = 2;
188: &add_obj($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-$length),
193: "FFFFFF",($width+$extrawidth))));
194: &add_obj($data,$imid,'LINE',
195: join(':',(($x-$length),($y-$length),($x+$length),($y+$length),
196: "FF0000",($width))));
197: &add_obj($data,$imid,'LINE',
198: join(':',(($x-$length),($y+$length),($x+$length),($y-$length),
199: "FF0000",($width))));
200: }
201:
202: sub drawPolygon {
203: my ($data,$id,$imid)=@_;
204: my (undef,@coords)=split(':',$env{"imagechoice.$id.coords"});
205: my $coordstr;
206: while (@coords) {
207: $coordstr.='('.shift(@coords).','.shift(@coords).')-';
208: }
209: chop($coordstr);
210: my $width = 1;
211: my $extrawidth = 2;
212: &add_obj($data,$imid,'POLYGON',
213: join(':',("FFFFFF",($width+$extrawidth)),'1'),$coordstr);
214: &add_obj($data,$imid,'POLYGON',
215: join(':',("00FF00",($width)),'1'),$coordstr);
216: }
217:
218: sub drawBox {
219: my ($data,$id,$imid)=@_;
220: my (undef,@coords)=split(':',$env{"imagechoice.$id.coords"});
221: if (scalar(@coords) < 4) { return ''; }
222: my $width = 1;
223: my $extrawidth = 2;
224: &add_obj($data,$imid,'RECTANGLE',
225: join(':',(@coords,"FFFFFF",($width+$extrawidth))));
226: &add_obj($data,$imid,'RECTANGLE',join(':',(@coords,"00FF00",$width)));
227: }
228:
229: sub drawimage {
230: my ($r,$type,$filename,$id)=@_;
231: my $imid=&Apache::loncommon::get_cgi_id();
232: my (undef,@coords)=split(':',$env{"imagechoice.$id.coords"});
233: if (scalar(@coords) < 2) { return &Apache::lonnet::hreflocation('',$filename); }
234: my %data;
235: $data{"cgi.$imid.BGIMG"}=$filename;
236: my $x=$coords[-2];
237: my $y=$coords[-1];
238: &drawX(\%data,$imid,$x,$y);
239: if ($type eq "polygon") { &drawPolygon(\%data,$id,$imid); }
240: if ($type eq "box") { &drawBox(\%data,$id,$imid); }
241: &Apache::lonnet::appenv(%data);
242: return "/adm/randomlabel.png?token=$imid"
243: }
244:
245: sub handler {
246: my ($r)=@_;
247: &Apache::loncommon::content_type($r,'text/html');
248: $r->send_http_header;
249: my %data;
250: my (undef,$id) = split(/=/,$ENV{'QUERY_STRING'});
251: my $filename = &unescape($env{"imagechoice.$id.file"});
252: my $formname = $env{"imagechoice.$id.formname"};
253: if ($env{'form.cancel'} eq 'Cancel') {
254: &deletedata($id);
255: &closewindow($r,'',$filename);
256: return OK;
257: }
258: my $type=$env{"imagechoice.$id.type"};
259: if (defined($env{'form.type'})) { $type=$env{'form.type'}; }
260: my $numcoords=&savecoord($id,$type);
261: my $imurl=&drawimage($r,$type,$filename,$id);
262: if (($env{'form.finish'} eq 'Finish')) {
263: &storedata($r,$type,$imurl,$id);
264: } else {
265: &getcoord($r,$type,$imurl,$id);
266: }
267: return OK;
268: }
269:
270: 1;
271:
272: __END__
273:
274:
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